For technical support and more information, see inside back cover or visit www.ti.com
1
SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003
Features
•Triple Outputs
(Independently Regulated)
•Input Voltage Range:
36V to 75V, 80V Surge
•1500VDC Isolation
•Dual Logic On/Off Control
•Short-Circuit Protection
(All Outputs)
•Fixed Frequency Operation
Ordering Information
PT4821o = +3.3/+2.5/+1.5V
PT4822o = +3.3/+1.8/+1.5V
PT4823o = +3.3/+2.5/+1.2V
PT4824o = +3.3/+1.8/+1.2V
PT4825o = +3.3/+1.5/+1.2V
PT4826o = +5.0/+3.3/+1.8V
PT4827o = +3.3/+2.5/+1.8V
PT4828o = +5.0/+2.5/+1.5V
PT4829o = +5.0/+1.8/+1.5V
PT4831o = +5.0/+3.3/+1.5V
PT4832o = +5.0/+3.3/+2.5V
* PT4833o = +3.3/+2.0/+1.5V
* The PT4833 is not included in the VDE
safety certification.
PT Series Suffix (PT1234x)
Case/Pin Order Package
Configuration Suffix Code
Vertical N(ENM)
Horizontal A(ENN)
SMD C(ENP)
(Reference the applicable package code drawing for
the dimensions and PC layout)
Typical Application
PT4820 Series
Description
The PT4820 Excalibur™ power
modules are a series of isolated triple-
output DC/DC converters that
operate from a standard (–48V)
central office supply. Rated for up to
35W, these regulators are ideal for
powering many mixed logic appli-
cations. The triple-output voltage
combination allows for a compact
multiple-output power supply in a
single low-profile DC/DC module.
The available output voltage
options include a low-voltage power
bus for a DSP or ASIC core, and
two additional standard logic supply
voltages.
The PT4820 series incorporates
many features to simplify system
integration. These include a flexible
On/Off enable control, an input
under-voltage lock-out, and over-
temperature protection. All outputs
have short-circuit protection and are
internally sequenced to meet the
power-up and power-down require-
ments of popular DSP ICs.
The PT4820 series is housed in
a space-saving solderable case. The
module requires no external heat sink
and can occupy as little as 1.3 in2 of
PCB area.
Cin = Optional
Co1, Co2, Co3= Optional; See specifications
EN1 & EN2 pins: See On/Off Enable Logic
35-W Triple Output Isolated DC/DC
Converter for Logic Applications
C
IN
+
Co
3
+
Co
2
+
Co
1
+
DSL, DSP,
or ASIC
Chipset
I/O
Logic
Core
+V
IN
–V
IN
18
PT4820
EN 2
EN 1
+Vo
1
+Vo
2
+Vo
3
COM
V
1
Adj
V
2
Adj
V
3
Adj
COM
+V
IN
–V
IN
12,13
11
16,17
15
20,21
19
9,10
3
1
2
4
COM 14
•Over-Temperature Shutdown
•Under-Voltage Lockout
•Space Saving Package:
1.3 sq. in. PCB Area (suffix N)
•Solderable Copper Case
•Safety Approvals:
UL60950
CSA 22.2 950
VDE EN60950
For technical support and more information, see inside back cover or visit www.ti.com
2
SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003
Pin Function
1 EN 1
2 EN 2
3+Vin
4–Vin
5 Do Not Connect
6 Pin Not Present
7 Pin Not Present
8 Pin Not Present
9 COM
10 COM
11 Vo1 Adjust
PT4820 Series
35-W Triple Output Isolated DC/DC
Converter for Logic Applications
Pin Function
12 Vo1
13 Vo1
14 COM
15 Vo2 adjust
16 +Vo2
17 +Vo2
18 COM
19 Vo3 adjust
20 +Vo3
21 +Vo3
On/Off Enable LogicPin Configuration
Pin Descriptions
Pin 1 Pin 2 Output Status
×1 Off
10 On
0× Off
Notes:
Logic 1 =Open collector
Logic 0 = –Vin (pin 2) potential
For positive Enable function, connect pin 2
to pin 4 and use pin 1.
For negative Enable function, leave pin 1
open and use pin 2.
For automatice power-up connect pin 2 to
pin 4 and leave pin 1 open.
+Vin: The positive input supply for the module with
respect to –Vin. When powering the module from a
–48V telecom central office supply, this input is
connected to the primary system ground.
–Vin: The negative input supply for the module, and
the 0VDC reference for the EN 1, and EN 2 inputs.
When powering the module from a +48V supply,
this input is connected to the 48V(Return).
EN 1: The positive logic input that activates the
module output. If not used, this pin should be left
open circuit. Connecting this input to –Vin disables
the module’s outputs.
EN 2: The negative logic input that activates the
module output. This pin must be connected to –Vin
to enable the module’s outputs. A high impedance
disables the module’s outputs.
Vo 1: The highest regulated output voltage, which is
referenced to the COM node.
Vo 2: The regulated output that is designed to power
logic circuitry. It is referenced to the COM node.
Vo 3: The low-voltage regulated output that provides
power for a µ-processor or DSP core, and is refer-
enced to the COM node.
COM: The secondary return reference for the module’s
three regulated output voltages. It is DC isolated from
the input supply pins.
Vo1 Adjust: Using a single resistor, this pin allows Vo1
to be adjusted higher or lower than the preset value.
If not used, this pin should be left open circuit.
Vo2 Adjust: Using a single resistor, this pin allows Vo2
to be adjusted higher or lower than the preset value.
If not used, this pin should be left open circuit.
Vo3 Adjust: Using a single resistor, this pin allows Vo3
to be adjusted higher or lower than the preset value.
If not used, this pin should be left open circuit.
Note: Shaded functions indicates those pins that are at primary-side
potential. All other pins are referenced to the secondary.
Environmental Specifications
Characteristics Symbols Conditions Min Typ Max Units
Ambient Temperature Range TaOver Vin Range –40 — +85 (i) °C
Case Temperature TcMeasured at center of case — — +100 °C
ShutdownTemperature OTP 115 125 °C
Solder Reflow Temperature Treflow Surface temperature of module pins or case — — 215 (ii) °C
Storage Temperature Ts— –40 — +125 °C
Mechanical Shock Per Mil-STD-883D, Method 2002.3
1 msec, ½ Sine, mounted — 500 — G’s
Mechanical Vibration Mil-STD-883D, Method 2007.2 Suffix A, C — 20 (iii) —
G’s
20-2000 Hz
Weight — Vertical/Horizontal — 50 — grams
Flammability — Meets UL 94V-O
Notes: (i) See SOA curves or consult factory for appropriate derating.
(ii) During solder reflow of SMD package version, do not elevate the module case, pins, or internal component temperatures above a peak of 215°C. For
further guidance refer to the application note, “Reflow Soldering Requirements for Plug-in Power Surface Mount Products,” (SLTA051).
(iii) The case pins on through-hole pin configurations (N & A) must be soldered. For more information see the applicable package outline drawing.
For technical support and more information, see inside back cover or visit www.ti.com
3
SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003
PT4821—48V
35-W Triple Output Isolated DC/DC
Converter for Logic Applications
PT4821 Electrical Specifications (Unless otherwise stated, the operating conditions are: Ta =25°C, Vin =48V, and Io =0.5Iomax)
PT4821
Characteristics Symbols Conditions Min Typ Max Units
Output Current IoEach output Io1 (3.3V) 0.25 (1) —8
(2)
Io2 (2.5V) 0.1 (1) —6
(2) A
Io3 (1.5V) 0.1 (1) —6
(2)
Total (Io1 + Io2 + Io3) ——12
(2) A
Input Voltage Range Vin Continuous 36 — 75 V
Surge (1 minute) — — 80
Set-Point Voltage VoVo13.24 3.3 3.36
Vo22.45 2.5 2.55 V
Vo31.47 1.5 1.53
Temperature Variation Regtemp –40°C ≤Ta ≤+85°C, Io =Iomin Vo1— ±0.5 — %Vo
Vo2/Vo3— ±0.5 —
Line Regulation Regline All outputs, Over Vin range — ±0.1 ±0.5 %Vo
Load Regulation Regload All outputs, 0≤Io≤Iomax — ±0.1 ±0.5 %Vo
Total Output Voltage Variation ∆Vo tol Includes set-point, line, load, Vo1— — ±3 (3) %Vo
–40°C ≤Ta ≤+85°C Vo2/Vo3— — ±3 (3)
Efficiency ηIo1 =6A, Io2 =2A, Io3 =2A — 87 — %
Vo Ripple/Noise VnVo1—40—
(0 to 20MHz bandwidth) Vo2—35—mV
pp
Vo3—25—
Transient Response ttr 0.1A/µs load step, 50% to 75% Iomax — 200 — µSec
Vos Vo over/undershoot — 3 — %Vo
Output Adjust Range Voadj Vo1/Vo2/Vo3— ±10 — %Vo
Over-Current Threshold ITRIP Total, all outputs. Reset with auto-recovery — 14 — A
Switching Frequency ƒsOver Vin and Io ranges 350 400 450 kHz
Under Voltage Lockout Von Vin increasing — 35.5 — V
Voff Vin decreasing — 34 —
Turn-On Time ton Vin =48V step — 140 (4) —ms
Enable Control (pins 1 & 2) Referenced to –Vin (pin 4)
High-Level Input Voltage VIH 4 — 15 (5) V
Low-Level Input Voltage VIL –0.2 — 0.8
Low-Level Input Current IIL —12mA
Standby Input Current Iin standby pins 1 & 2 open circuit — 1 5 mA
Internal Input Capacitance Cint — 1.14 — µF
External Output Capacitance Co10 220 1,000 (6)
Co20 220 1,000 (6) µF
Co30 220 1,000 (6)
Primary/Secondary Isolation V iso 1500 — — V
C iso — 2,200 — pF
R iso 10——MΩ
Notes:
(1) The converter will operate down to no load with reduced specifications.
(2) The sum-total current from outputs Vo1, Vo2, and Vo3 not to exceed 12ADC.
(3) Limits are specified by design.
(4) Measured from the application of the input voltage to the instance that all outputs are in regulation.
(5) The Enable inputs (pins 1 & 2) have internal pull-ups. Leaving pin 1 open-circuit and connecting pin 2 to –Vin allows the the converter to operate when
input power is applied. The maximum open-circuit voltage is 4V.
(6) Ultra-low ESR capacitors, such as organic or polymer aluminum electrolytic types, may cause instability. Consult the factory before using.
For technical support and more information, see inside back cover or visit www.ti.com
4
SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003
PT4821—48V
35-W Triple Output Isolated DC/DC
Converter for Logic Applications
Efficiency vs Output Power
(Io1 =8A, Io2 =2A, Io3 =2A represents 100% Load)
PT4821 Performance Characteristics (See Notes A, B)
Typical Characteristics
Power Dissipation vs Output Load
Note A: All Characteristic data in the above graphs has been developed from actual products tested at 25°C. This data is considered typical data for the ISR.
Note B: Output Load (%) represents the percent drawn from each output of the stated 100% load condition.
Note C: SOA curves represent operating conditions at which the internal components are at or below the manufacturer’s maximum rated operating temperatures.
Safe Operating Area @Vin =48V
PT4821 Thermal Performance (See Note C)
(Io1 + Io2 + Io3 =12A, represents 100% Load)
Output Ripple vs Output Power; Vin =48V
(Io1 =8A, Io2 =2A, Io3 =2A represents 100% Load)
50
60
70
80
90
100
0 20406080100
Out
p
ut Load
(
%
)
Efficiency - %
36V
48V
75V
VIN
0
20
40
60
80
100
0 20406080100
Out
p
ut Load
(
%
)
Ripple - mV
3.3V
2.5V
1.5V
VOUT
0
2
4
6
8
0 20406080100
Out
p
ut Load
(
%
)
Pd - Watts
75V
48V
36V
VIN
50
60
70
80
90
100
0 20406080100
Out
p
ut Load
(
%
)
Efficiency - %
36V
48V
75V
VIN
0
20
40
60
80
100
0 20406080100
Out
p
ut Load
(
%
)
Ripple - mV
3.3V
2.5V
1.5V
VOUT
Efficiency vs Output Power
(Io1 =4A, Io2 =4A, Io3 =4A represents 100% Load)
Output Ripple vs Output Power; Vin =48V
(Io1 =4A, Io2 =4A, Io3 =4A represents 100% Load)
20
30
40
50
60
70
80
90
0% 20% 40% 60% 80% 100%
Out
p
ut Load
(
%
)
Ambient Temperature (°C)
200LFM
120LFM
60LFM
Nat conv
Airflow
For technical support and more information, see inside back cover or visit www.ti.com
5
SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003
PT4822—48V
35-W Triple Output Isolated DC/DC
Converter for Logic Applications
PT4822 Electrical Specifications (Unless otherwise stated, the operating conditions are: Ta =25°C, Vin =48V, and Io =0.5Iomax)
PT4822
Characteristics Symbols Conditions Min Typ Max Units
Output Current IoEach output Io1 (3.3V) 0.25 (1) —8
(2)
Io2 (1.8V) 0.1 (1) —6
(2) A
Io3 (1.5V) 0.1 (1) —6
(2)
Total (Io1 + Io2 + Io3) ——12
(2) A
Input Voltage Range Vin Continuous 36 — 75 V
Surge (1 minute) — — 80
Set-Point Voltage VoVo13.24 3.3 3.36
Vo21.76 1.8 1.84 V
Vo31.47 1.5 1.53
Temperature Variation Regtemp –40°C ≤Ta ≤+85°C, Io =Iomin Vo1— ±0.5 — %Vo
Vo2/Vo3— ±0.5 —
Line Regulation Regline All outputs, Over Vin range — ±0.1 ±0.5 %Vo
Load Regulation Regload All outputs, 0≤Io≤Iomax — ±0.1 ±0.5 %Vo
Total Output Voltage Variation ∆Vo tol Includes set-point, line, load, Vo1— — ±3 (3) %Vo
–40°C ≤Ta ≤+85°C Vo2/Vo3— — ±3 (3)
Efficiency ηIo1 =6A, Io2 =2A, Io3 =2A — 86 — %
Vo Ripple/Noise VnVo1—40—
(0 to 20MHz bandwidth) Vo2—25—mV
pp
Vo3—25—
Transient Response ttr 0.1A/µs load step, 50% to 75% Iomax — 200 — µSec
Vos Vo over/undershoot — 3 — %Vo
Output Adjust Range Voadj Vo1/Vo2/Vo3— ±10 — %Vo
Over-Current Threshold ITRIP Total, all outputs. Reset with auto-recovery — 14 — A
Switching Frequency ƒsOver Vin and Io ranges 350 400 450 kHz
Under Voltage Lockout Von Vin increasing — 35.5 — V
Voff Vin decreasing — 34 —
Turn-On Time ton Vin =48V step — 140 (4) —ms
Enable Control (pins 1 & 2) Referenced to –Vin (pin 4)
High-Level Input Voltage VIH 4 — 15 (5) V
Low-Level Input Voltage VIL –0.2 — 0.8
Low-Level Input Current IIL —12mA
Standby Input Current Iin standby pins 1 & 2 open circuit — 1 5 mA
Internal Input Capacitance Cint — 1.14 — µF
External Output Capacitance Co10 220 1,000 (6)
Co20 220 1,000 (6) µF
Co30 220 1,000 (6)
Primary/Secondary Isolation V iso 1500 — — V
C iso — 2,200 — pF
R iso 10——MΩ
Notes:
(1) The converter will operate down to no load with reduced specifications.
(2) The sum-total current from outputs Vo1, Vo2, and Vo3 cannot exceed 12ADC.
(3) Limits are specified by design.
(4) Measured from the application of the input voltage to the instance that all outputs are in regulation.
(5) The Enable inputs (pins 1 & 2) have internal pull-ups. Leaving pin 1 open-circuit and connecting pin 2 to –Vin allows the the converter to operate when
input power is applied. The maximum open-circuit voltage is 4V.
(6) Ultra-low ESR capacitors, such as organic or polymer aluminum electrolytic types, may cause instability. Consult the factory before using.
For technical support and more information, see inside back cover or visit www.ti.com
6
SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003
PT4822—48V
35-W Triple Output Isolated DC/DC
Converter for Logic Applications
PT4822 Performance Characteristics (See Note A, B)
Typical Characteristics
Note A: All Characteristic data in the above graphs has been developed from actual products tested at 25°C. This data is considered typical data for the ISR.
Note B: Output Load (%) represents the percent drawn from each output of the stated 100% load condition.
Note C: SOA curves represent operating conditions at which the internal components are at or below the manufacturer’s maximum rated operating temperatures.
PT4822 Thermal Performance (See Note C)
(Io1 + Io2 + Io3 =12A, represents 100% Load)
50
60
70
80
90
100
0 20406080100
Out
p
ut Load
(
%
)
Efficiency - %
36V
48V
75V
VIN
0
20
40
60
80
100
0 20406080100
Out
p
ut Load
(
%
)
Ripple - mV
3.3V
1.8V
1.5V
VOUT
0
20
40
60
80
100
0 20406080100
Out
p
ut Load
(
%
)
Ripple - mV
3.3V
1.8V
1.5V
VOUT
Efficiency vs Output Power
(Io1 =8A, Io2 =2A, Io3 =2A represents 100% Load)
Output Ripple vs Output Power; Vin =48V
(Io1 =8A, Io2 =2A, Io3 =2A represents 100% Load)
Efficiency vs Output Power
(Io1 =4A, Io2 =4A, Io3 =4A represents 100% Load)
Output Ripple vs Output Power; Vin =48V
(Io1 =4A, Io2 =4A, Io3 =4A represents 100% Load)
50
60
70
80
90
100
0 20406080100
Out
p
ut Load
(
%
)
Efficiency - %
36V
48V
75V
VIN
0
2
4
6
8
0 20406080100
Out
p
ut Load
(
%
)
Pd - Watts
75V
48V
36V
VIN
Power Dissipation vs Output Load
20
30
40
50
60
70
80
90
0% 20% 40% 60% 80% 100%
Out
p
ut Load
(
%
)
Ambient Temperature (°C)
200LFM
120LFM
60LFM
Nat Conv
Airflow
Safe Operating Area @Vin =48V
For technical support and more information, see inside back cover or visit www.ti.com
7
SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003
PT4823—48V
35-W Triple Output Isolated DC/DC
Converter for Logic Applications
PT4823 Electrical Specifications (Unless otherwise stated, the operating conditions are: Ta =25°C, Vin =48V, and Io =0.5Iomax)
PT4823
Characteristics Symbols Conditions Min Typ Max Units
Output Current IoEach output Io1 (3.3V) 0.25 (1) —8
(2)
Io2 (2.5V) 0.1 (1) —6
(2) A
Io3 (1.2V) 0.1 (1) —6
(2)
Total (Io1 + Io2 + Io3) ——12
(2) A
Input Voltage Range Vin Continuous 36 — 75 V
Surge (1 minute) — — 80
Set-Point Voltage VoVo13.24 3.3 3.36
Vo22.45 2.5 2.55 V
Vo31.17 1.2 1.23
Temperature Variation Regtemp –40°C ≤Ta ≤+85°C, Io =Iomin Vo1— ±0.5 — %Vo
Vo2/Vo3— ±0.5 —
Line Regulation Regline All outputs, Over Vin range — ±0.1 ±0.5 %Vo
Load Regulation Regload All outputs, 0≤Io≤Iomax — ±0.1 ±0.5 %Vo
Total Output Voltage Variation ∆Vo tol Includes set-point, line, load, Vo1— — ±3 (3) %Vo
–40°C ≤Ta ≤+85°C Vo2/Vo3— — ±3 (3)
Efficiency ηIo1 =6A, Io2 =2A, Io3 =2A — 85.6 — %
Vo Ripple/Noise VnVo1—35—
(0 to 20MHz bandwidth) Vo2—25—mV
pp
Vo3—25—
Transient Response ttr 0.1A/µs load step, 50% to 75% Iomax — 200 — µSec
Vos Vo over/undershoot — 3 — %Vo
Output Adjust Range Voadj Vo1/Vo2/Vo3— ±10 — %Vo
Over-Current Threshold ITRIP Total, all outputs. Reset with auto-recovery — 14 — A
Switching Frequency ƒsOver Vin and Io ranges 350 400 450 kHz
Under Voltage Lockout Von Vin increasing — 35.5 — V
Voff Vin decreasing — 34 —
Turn-On Time ton Vin =48V step — 140 (4) —ms
Enable Control (pins 1 & 2) Referenced to –Vin (pin 4)
High-Level Input Voltage VIH 4 — 15 (5) V
Low-Level Input Voltage VIL –0.2 — 0.8
Low-Level Input Current IIL —12mA
Standby Input Current Iin standby pins 1 & 2 open circuit — 1 5 mA
Internal Input Capacitance Cint — 1.14 — µF
External Output Capacitance Co10 220 1,000 (6)
Co20 220 1,000 (6) µF
Co30 220 1,000 (6)
Primary/Secondary Isolation V iso 1500 — — V
C iso — 2,200 — pF
R iso 10——MΩ
Notes:
(1) The converter will operate down to no load with reduced specifications.
(2) The sum-total current from outputs Vo1, Vo2, and Vo3 cannot exceed 12ADC.
(3) Limits are specified by design.
(4) Measured from the application of the input voltage to the instance that all outputs are in regulation.
(5) The Enable inputs (pins 1 & 2) have internal pull-ups. Leaving pin 1 open-circuit and connecting pin 2 to –Vin allows the the converter to operate when
input power is applied. The maximum open-circuit voltage is 4V.
(6) Ultra-low ESR capacitors, such as organic or polymer aluminum electrolytic types, may cause instability. Consult the factory before using.
For technical support and more information, see inside back cover or visit www.ti.com
8
SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003
PT4823—48V
35-W Triple Output Isolated DC/DC
Converter for Logic Applications
Typical Characteristics
Note A: All Characteristic data in the above graphs has been developed from actual products tested at 25°C. This data is considered typical data for the ISR.
Note B: Output Load (%) represents the percent drawn from each output of the stated 100% load condition.
Note C: SOA curves represent operating conditions at which the internal components are at or below the manufacturer’s maximum rated operating temperatures.
PT4823 Performance Characteristics (See Notes A, B)
Power Dissipation vs Output Load
PT4823 Thermal Performance (See Note C)
(Io1 + Io2 + Io3 =12A, represents 100% Load)
Efficiency vs Output Power
(Io1 =8A, Io2 =2A, Io3 =2A represents 100% Load)
Output Ripple vs Output Power; Vin =48V
(Io1 =8A, Io2 =2A, Io3 =2A represents 100% Load)
Efficiency vs Output Power
(Io1 =4A, Io2 =4A, Io3 =4A represents 100% Load)
Output Ripple vs Output Power; Vin =48V
(Io1 =4A, Io2 =4A, Io3 =4A represents 100% Load)
50
60
70
80
90
100
0 20406080100
Out
p
ut Load
(
%
)
Efficiency - %
36V
48V
75V
VIN
0
20
40
60
80
100
0 20406080100
Out
p
ut Load
(
%
)
Ripple - mV
2.5V
3.3V
1.2V
VOUT
0
2
4
6
8
0 20406080100
Out
p
ut Load
(
%
)
Pd - Watts
75V
48V
36V
VIN
50
60
70
80
90
100
0 20406080100
Out
p
ut Load
(
%
)
Efficiency - %
36V
48V
75V
VIN
0
20
40
60
80
100
0 20406080100
Out
p
ut Load
(
%
)
Ripple - mV
2.5V
3.3V
1.2V
VOUT
Safe Operating Area @Vin =48V
20
30
40
50
60
70
80
90
0% 20% 40% 60% 80% 100%
Out
p
ut Load
(
%
)
Ambient Temperature (°C)
200LFM
120LFM
60LFM
Nat Conv
Airflow
For technical support and more information, see inside back cover or visit www.ti.com
9
SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003
PT4824—48V
35-W Triple Output Isolated DC/DC
Converter for Logic Applications
PT4824 Electrical Specifications (Unless otherwise stated, the operating conditions are: Ta =25°C, Vin =48V, and Io =0.5Iomax)
PT4824
Characteristics Symbols Conditions Min Typ Max Units
Output Current IoEach output Io1 (3.3V) 0.25 (1) —8
(2)
Io2 (1.8V) 0.1 (1) —6
(2) A
Io3 (1.2V) 0.1 (1) —6
(2)
Total (Io1 + Io2 + Io3) ——12
(2) A
Input Voltage Range Vin Continuous 36 — 75 V
Surge (1 minute) — — 80
Set-Point Voltage VoVo13.24 3.3 3.36
Vo21.76 1.8 1.84 V
Vo31.17 1.2 1.23
Temperature Variation Regtemp –40°C ≤Ta ≤+85°C, Io =Iomin Vo1— ±0.5 — %Vo
Vo2/Vo3— ±0.5 —
Line Regulation Regline All outputs, Over Vin range — ±0.1 ±0.5 %Vo
Load Regulation Regload All outputs, 0≤Io≤Iomax — ±0.1 ±0.5 %Vo
Total Output Voltage Variation ∆Vo tol Includes set-point, line, load, Vo1— — ±3 (3) %Vo
–40°C ≤Ta ≤+85°C Vo2/Vo3— — ±3 (3)
Efficiency ηIo1 =6A, Io2 =2A, Io3 =2A — 85 — %
Vo Ripple/Noise VnVo1—30—
(0 to 20MHz bandwidth) Vo2—25—mV
pp
Vo3—25—
Transient Response ttr 0.1A/µs load step, 50% to 75% Iomax — 200 — µSec
Vos Vo over/undershoot — 3 — %Vo
Output Adjust Range Voadj Vo1/Vo2/Vo3— ±10 — %Vo
Over-Current Threshold ITRIP Total, all outputs. Reset with auto-recovery — 14 — A
Switching Frequency ƒsOver Vin and Io ranges 350 400 450 kHz
Under Voltage Lockout Von Vin increasing — 35.5 — V
Voff Vin decreasing — 34 —
Turn-On Time ton Vin =48V step — 140 (4) —ms
Enable Control (pins 1 & 2) Referenced to –Vin (pin 4)
High-Level Input Voltage VIH 4 — 15 (5) V
Low-Level Input Voltage VIL –0.2 — 0.8
Low-Level Input Current IIL —12mA
Standby Input Current Iin standby pins 1 & 2 open circuit — 1 5 mA
Internal Input Capacitance Cint — 1.14 — µF
External Output Capacitance Co10 220 1,000 (6)
Co20 220 1,000 (6) µF
Co30 220 1,000 (6)
Primary/Secondary Isolation V iso 1500 — — V
C iso — 2,200 — pF
R iso 10——MΩ
Notes:
(1) The converter will operate down to no load with reduced specifications.
(2) The sum-total current from outputs Vo1, Vo2, and Vo3 cannot exceed 12ADC.
(3) Limits are specified by design.
(4) Measured from the application of the input voltage to the instance that all outputs are in regulation.
(5) The Enable inputs (pins 1 & 2) have internal pull-ups. Leaving pin 1 open-circuit and connecting pin 2 to –Vin allows the the converter to operate when
input power is applied. The maximum open-circuit voltage is 4V.
(6) Ultra-low ESR capacitors, such as organic or polymer aluminum electrolytic types, may cause instability. Consult the factory before using.
For technical support and more information, see inside back cover or visit www.ti.com
10
SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003
PT4824—48V
35-W Triple Output Isolated DC/DC
Converter for Logic Applications
Typical Characteristics
Note A: All Characteristic data in the above graphs has been developed from actual products tested at 25°C. This data is considered typical data for the ISR.
Note B: Output Load (%) represents the percent drawn from each output of the stated 100% load condition.
Note C: SOA curves represent operating conditions at which the internal components are at or below the manufacturer’s maximum rated operating temperatures.
PT4824 Performance Characteristics (See Notes A, B)
Power Dissipation vs Output Load
PT4824 Thermal Performance (See Note C)
(Io1 + Io2 + Io3 =12A, represents 100% Load)
Efficiency vs Output Power
(Io1 =8A, Io2 =2A, Io3 =2A represents 100% Load)
Output Ripple vs Output Power; Vin =48V
(Io1 =8A, Io2 =2A, Io3 =2A represents 100% Load)
Efficiency vs Output Power
(Io1 =4A, Io2 =4A, Io3 =4A represents 100% Load)
Output Ripple vs Output Power; Vin =48V
(Io1 =4A, Io2 =4A, Io3 =4A represents 100% Load)
50
60
70
80
90
100
0 20406080100
Out
p
ut Load
(
%
)
Efficiency - %
36V
48V
75V
VIN
50
60
70
80
90
100
0 20406080100
Out
p
ut Load
(
%
)
Efficiency - %
36V
48V
75V
VIN
0
20
40
60
80
100
0 20406080100
Out
p
ut Load
(
%
)
Ripple - mV
3.3V
1.8V
1.2V
VOUT
0
20
40
60
80
100
0 20406080100
Out
p
ut Load
(
%
)
Ripple - mV
3.3V
1.8V
1.2V
VOUT
0
2
4
6
8
0 20406080100
Out
p
ut Load
(
%
)
Pd - Watts
36V
48V
75V
VIN
Safe Operating Area @Vin =48V
20
30
40
50
60
70
80
90
0% 20% 40% 60% 80% 100%
Out
p
ut Load
(
%
)
Ambient Temperature (°C)
200LFM
120LFM
60LFM
Nat Conv
Airflow
For technical support and more information, see inside back cover or visit www.ti.com
11
SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003
PT4825—48V
35-W Triple Output Isolated DC/DC
Converter for Logic Applications
PT4825 Electrical Specifications (Unless otherwise stated, the operating conditions are: Ta =25°C, Vin =48V, and Io =0.5Iomax)
PT4825
Characteristics Symbols Conditions Min Typ Max Units
Output Current IoEach output Io1 (3.3V) 0.25 (1) —8
(2)
Io2 (1.5V) 0.1 (1) —6
(2) A
Io3 (1.2V) 0.1 (1) —6
(2)
Total (Io1 + Io2 + Io3) ——12
(2) A
Input Voltage Range Vin Continuous 36 — 75 V
Surge (1 minute) — — 80
Set-Point Voltage VoVo13.24 3.3 3.36
Vo21.47 1.5 1.53 V
Vo31.17 1.2 1.23
Temperature Variation Regtemp –40°C ≤Ta ≤+85°C, Io =Iomin Vo1— ±0.5 — %Vo
Vo2/Vo3— ±0.5 —
Line Regulation Regline All outputs, Over Vin range — ±0.1 ±0.5 %Vo
Load Regulation Regload All outputs, 0≤Io≤Iomax — ±0.1 ±0.5 %Vo
Total Output Voltage Variation ∆Vo tol Includes set-point, line, load, Vo1— — ±3 (3) %Vo
–40°C ≤Ta ≤+85°C Vo2/Vo3— — ±3 (3)
Efficiency ηIo1 =6A, Io2 =2A, Io3 =2A — 86 — %
Vo Ripple/Noise VnVo1—35—
(0 to 20MHz bandwidth) Vo2—25—mV
pp
Vo3—25—
Transient Response ttr 0.1A/µs load step, 50% to 75% Iomax — 200 — µSec
Vos Vo over/undershoot — 3 — %Vo
Output Adjust Range Voadj Vo1/Vo2/Vo3— ±10 — %Vo
Over-Current Threshold ITRIP Total, all outputs. Reset with auto-recovery — 14 — A
Switching Frequency ƒsOver Vin and Io ranges 350 400 450 kHz
Under Voltage Lockout Von Vin increasing — 35.5 — V
Voff Vin decreasing — 34 —
Turn-On Time ton Vin =48V step — 140 (4) —ms
Enable Control (pins 1 & 2) Referenced to –Vin (pin 4)
High-Level Input Voltage VIH 4 — 15 (5) V
Low-Level Input Voltage VIL –0.2 — 0.8
Low-Level Input Current IIL —12mA
Standby Input Current Iin standby pins 1 & 2 open circuit — 1 5 mA
Internal Input Capacitance Cint — 1.14 — µF
External Output Capacitance Co10 220 1,000 (6)
Co20 220 1,000 (6) µF
Co30 220 1,000 (6)
Primary/Secondary Isolation V iso 1500 — — V
C iso — 2,200 — pF
R iso 10——MΩ
Notes:
(1) The converter will operate down to no load with reduced specifications.
(2) The sum-total current from outputs Vo1, Vo2, and Vo3 not to exceed 12ADC.
(3) Limits are specified by design.
(4) Measured from the application of the input voltage to the instance that all outputs are in regulation.
(5) The Enable inputs (pins 1 & 2) have internal pull-ups. Leaving pin 1 open-circuit and connecting pin 2 to –Vin allows the the converter to operate when
input power is applied. The maximum open-circuit voltage is 4V.
(6) Ultra-low ESR capacitors, such as organic or polymer aluminum electrolytic types, may cause instability. Consult the factory before using.
For technical support and more information, see inside back cover or visit www.ti.com
12
SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003
PT4825—48V
35-W Triple Output Isolated DC/DC
Converter for Logic Applications
PT4825 Performance Characteristics (See Notes A, B)
Typical Characteristics
Power Dissipation vs Output Load
Note A: All Characteristic data in the above graphs has been developed from actual products tested at 25°C. This data is considered typical data for the ISR.
Note B: Output Load (%) represents the percent drawn from each output of the stated 100% load condition.
Note C: SOA curves represent operating conditions at which the internal components are at or below the manufacturer’s maximum rated operating temperatures.
PT4825 Thermal Performance (See Note C)
(Io1 + Io2 + Io3 =12A, represents 100% Load)
50
60
70
80
90
100
0 20406080100
Out
p
ut Load
(
%
)
Efficiency - %
36V
48V
75V
VIN
0
20
40
60
80
100
0 20406080100
Out
p
ut Load
(
%
)
Ripple - mV
3.3V
1.2V
1.5V
VOUT
0
2
4
6
8
10
0 20406080100
Out
p
ut Load
(
%
)
Pd - Watts
36V
48V
75V
VIN
50
60
70
80
90
100
0 20406080100
Out
p
ut Load
(
%
)
Efficiency - %
36V
48V
75V
VIN
0
20
40
60
80
100
0 20406080100
Out
p
ut Load
(
%
)
Ripple - mV
3.3V
1.2V
1.5V
VOUT
Efficiency vs Output Power
(Io1 =8A, Io2 =2A, Io3 =2A represents 100% Load)
Output Ripple vs Output Power; Vin =48V
(Io1 =8A, Io2 =2A, Io3 =2A represents 100% Load)
Efficiency vs Output Power
(Io1 =4A, Io2 =4A, Io3 =4A represents 100% Load)
Output Ripple vs Output Power; Vin =48V
(Io1 =4A, Io2 =4A, Io3 =4A represents 100% Load)
Safe Operating Area @Vin =48V
20
30
40
50
60
70
80
90
0% 20% 40% 60% 80% 100%
Out
p
ut Load
(
%
)
Ambient Temperature (°C)
200LFM
120LFM
60LFM
Nat Conv
Airflow
For technical support and more information, see inside back cover or visit www.ti.com
13
SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003
PT4826—48V
35-W Triple Output Isolated DC/DC
Converter for Logic Applications
PT4826 Electrical Specifications (Unless otherwise stated, the operating conditions are: Ta =25°C, Vin =48V, and Io =0.5Iomax)
PT4826
Characteristics Symbols Conditions Min Typ Max Units
Output Current IoEach output Io1 (5.0V) 0.25 (1) — 5.0 (2)
Io2 (3.3V) 0.1 (1) — 5.5 (2) A
Io3 (1.8V) 0.1 (1) — 5.5 (2)
Total (Io1 + Io2 + Io3) ——9
(2) A
Input Voltage Range Vin Continuous 36 — 75 V
Surge (1 minute) — — 80
Set-Point Voltage VoVo14.9 5.0 5.1
Vo23.24 3.3 3.36 V
Vo31.76 1.8 1.84
Temperature Variation Regtemp –40°C ≤Ta ≤+85°C, Io =Iomin Vo1— ±0.5 — %Vo
Vo2/Vo3— ±0.5 —
Line Regulation Regline All outputs, Over Vin range — ±0.1 ±0.5 %Vo
Load Regulation Regload All outputs, 0≤Io≤Iomax — ±0.1 ±0.5 %Vo
Total Output Voltage Variation ∆Vo tol Includes set-point, line, load, Vo1— — ±3 (3) %Vo
–40°C ≤Ta ≤+85°C Vo2/Vo3— — ±3 (3)
Efficiency ηIo1 =5A, Io2 =2A, Io3 =2A — 87 — %
Vo Ripple/Noise VnVo1—40—
(0 to 20MHz bandwidth) Vo2—35—mV
pp
Vo3—25—
Transient Response ttr 0.1A/µs load step, 50% to 75% Iomax — 200 — µSec
Vos Vo over/undershoot — 5 — %Vo
Output Adjust Range Voadj Vo1/Vo2/Vo3— ±10 — %Vo
Over-Current Threshold ITRIP Total, all outputs. Reset with auto-recovery — 11 — A
Switching Frequency ƒsOver Vin and Io ranges 350 400 450 kHz
Under Voltage Lockout Von Vin increasing — 35.5 — V
Voff Vin decreasing — 34 —
Turn-On Time ton Vin =48V step — 140 (4) —ms
Enable Control (pins 1 & 2) Referenced to –Vin (pin 4)
High-Level Input Voltage VIH 4 — 15 (5) V
Low-Level Input Voltage VIL –0.2 — 0.8
Low-Level Input Current IIL —12mA
Standby Input Current Iin standby pins 1 & 2 open circuit — 1 5 mA
Internal Input Capacitance Cint — 1.14 — µF
External Output Capacitance Co10 220 1,000 (6)
Co20 220 1,000 (6) µF
Co30 220 1,000 (6)
Primary/Secondary Isolation V iso 1500 — — V
C iso — 2,200 — pF
R iso 10——MΩ
Notes:
(1) The converter will operate down to no load with reduced specifications.
(2) The sum-total current from outputs Vo1, Vo2, and Vo3 cannot exceed 9ADC.
(3) Limits are specified by design.
(4) Measured from the application of the input voltage to the instance that all outputs are in regulation.
(5) The Enable inputs (pins 1 & 2) have internal pull-ups. Leaving pin 1 open-circuit and connecting pin 2 to –Vin allows the the converter to operate when
input power is applied. The maximum open-circuit voltage is 4V.
(6) Ultra-low ESR capacitors, such as organic or polymer aluminum electrolytic types, may cause instability. Consult the factory before using.
For technical support and more information, see inside back cover or visit www.ti.com
14
SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003
PT4826—48V
35-W Triple Output Isolated DC/DC
Converter for Logic Applications
PT4826 Performance Characteristics (See Notes A, B)
Typical Characteristics
Power Dissipation vs Output Load
Note A: All Characteristic data in the above graphs has been developed from actual products tested at 25°C. This data is considered typical data for the ISR.
Note B: Output Load (%) represents the percent drawn from each output of the stated 100% load condition.
Note C: SOA curves represent operating conditions at which the internal components are at or below the manufacturer’s maximum rated operating temperatures.
PT4826 Thermal Performance (See Note C)
(Io1 + Io2 + Io3 =9A, represents 100% Load)
50
60
70
80
90
100
0 20406080100
Out
p
ut Load
(
%
)
Efficiency - %
36V
48V
75V
VIN
0
20
40
60
80
100
0 20406080100
Out
p
ut Load
(
%
)
Ripple - mV
3.3V
1.8V
5.0V
VOUT
Efficiency vs Output Power
(Io1 =5A, Io2 =2A, Io3 =2A represents 100% Load)
Output Ripple vs Output Power; Vin =48V
(Io1 =5A, Io2 =2A, Io3 =2A represents 100% Load)
Efficiency vs Output Power
(Io1 =2A, Io2 =2A, Io3 =5A represents 100% Load)
Output Ripple vs Output Power; Vin =48V
(Io1 =2A, Io2 =2A, Io3 =5A represents 100% Load)
50
60
70
80
90
100
0 20406080100
Out
p
ut Load
(
%
)
Efficiency - %
36V
48V
75V
VIN
0
20
40
60
80
100
0 20406080100
Out
p
ut Load
(
%
)
Ripple - mV
3.3V
1.8V
5V
VOUT
0
2
4
6
8
10
0 20406080100
Out
p
ut Load
(
%
)
Pd - Watts
75V
48V
36V
VIN
Safe Operating Area @Vin =48V
20
30
40
50
60
70
80
90
0% 20% 40% 60% 80% 100%
Out
p
ut Load
(
%
)
Ambient Temperature (°C)
200LFM
120LFM
60LFM
Nat Conv
Airflow
For technical support and more information, see inside back cover or visit www.ti.com
15
SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003
PT4827—48V
35-W Triple Output Isolated DC/DC
Converter for Logic Applications
PT4827 Electrical Specifications (Unless otherwise stated, the operating conditions are: Ta =25°C, Vin =48V, and Io =0.5Iomax)
PT4827
Characteristics Symbols Conditions Min Typ Max Units
Output Current IoEach output Io1 (3.3V) 0.25 (1) —8
(2)
Io2 (2.5V) 0.1 (1) —6
(2) A
Io3 (1.8V) 0.1 (1) —6
(2)
Total (Io1 + Io2 + Io3) ——12
(2) A
Input Voltage Range Vin Continuous 36 — 75 V
Surge (1 minute) — — 80
Set-Point Voltage VoVo13.24 3.3 3.36
Vo22.45 2.5 2.55 V
Vo31.76 1.8 1.84
Temperature Variation Regtemp –40°C ≤Ta ≤+85°C, Io =Iomin Vo1— ±0.5 — %Vo
Vo2/Vo3— ±0.5 —
Line Regulation Regline All outputs, Over Vin range — ±0.1 ±0.5 %Vo
Load Regulation Regload All outputs, 0≤Io≤Iomax — ±0.1 ±0.5 %Vo
Total Output Voltage Variation ∆Vo tol Includes set-point, line, load, Vo1— — ±3 (3) %Vo
–40°C ≤Ta ≤+85°C Vo2/Vo3— — ±3 (3)
Efficiency ηIo1 =6A, Io2 =2A, Io3 =2A — 86 — %
Vo Ripple/Noise VnVo1—40—
(0 to 20MHz bandwidth) Vo2—35—mV
pp
Vo3—25—
Transient Response ttr 0.1A/µs load step, 50% to 75% Iomax — 200 — µSec
Vos Vo over/undershoot — 3 — %Vo
Output Adjust Range Voadj Vo1/Vo2/Vo3— ±10 — %Vo
Over-Current Threshold ITRIP Total, all outputs. Reset with auto-recovery — 14 — A
Switching Frequency ƒsOver Vin and Io ranges 350 400 450 kHz
Under Voltage Lockout Von Vin increasing — 35.5 — V
Voff Vin decreasing — 34 —
Turn-On Time ton Vin =48V step — 140 (4) —ms
Enable Control (pins 1 & 2) Referenced to –Vin (pin 4)
High-Level Input Voltage VIH 4 — 15 (5) V
Low-Level Input Voltage VIL –0.2 — 0.8
Low-Level Input Current IIL —12mA
Standby Input Current Iin standby pins 1 & 2 open circuit — 1 5 mA
Internal Input Capacitance Cint — 1.14 — µF
External Output Capacitance Co10 220 1,000 (6)
Co20 220 1,000 (6) µF
Co30 220 1,000 (6)
Primary/Secondary Isolation V iso 1500 — — V
C iso — 2,200 — pF
R iso 10——MΩ
Notes:
(1) The converter will operate down to no load with reduced specifications.
(2) The sum-total current from outputs Vo1, Vo2, and Vo3 cannot exceed 12ADC.
(3) Limits are specified by design.
(4) Measured from the application of the input voltage to the instance that all outputs are in regulation.
(5) The Enable inputs (pins 1 & 2) have internal pull-ups. Leaving pin 1 open-circuit and connecting pin 2 to –Vin allows the the converter to operate when
input power is applied. The maximum open-circuit voltage is 4V.
(6) Ultra-low ESR capacitors, such as organic or polymer aluminum electrolytic types, may cause instability. Consult the factory before using.
For technical support and more information, see inside back cover or visit www.ti.com
16
SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003
PT4827—48V
35-W Triple Output Isolated DC/DC
Converter for Logic Applications
Typical Characteristics
Note A: All Characteristic data in the above graphs has been developed from actual products tested at 25°C. This data is considered typical data for the ISR.
Note B: Output Load (%) represents the percent drawn from each output of the stated 100% load condition.
Note C: SOA curves represent operating conditions at which the internal components are at or below the manufacturer’s maximum rated operating temperatures.
PT4827 Performance Characteristics (See Notes A, B)
Power Dissipation vs Output Load
PT4827 Thermal Performance (See Note C)
(Io1 + Io2 + Io3 =12A, represents 100% Load)
Efficiency vs Output Power
(Io1 =8A, Io2 =2A, Io3 =2A represents 100% Load)
Output Ripple vs Output Power; Vin =48V
(Io1 =8A, Io2 =2A, Io3 =2A represents 100% Load)
Efficiency vs Output Power
(Io1 =4A, Io2 =4A, Io3 =4A represents 100% Load)
Output Ripple vs Output Power; Vin =48V
(Io1 =4A, Io2 =4A, Io3 =4A represents 100% Load)
50
60
70
80
90
100
0 20406080100
Out
p
ut Load
(
%
)
Efficiency - %
36V
48V
75V
VIN
50
60
70
80
90
100
0 20406080100
Out
p
ut Load
(
%
)
Efficiency - %
36V
48V
75V
VIN
0
20
40
60
80
100
0 20406080100
Out
p
ut Load
(
%
)
Ripple - mV
3.3V
2.5V
1.8V
VOUT
0
20
40
60
80
100
0 20406080100
Out
p
ut Load
(
%
)
Ripple - mV
3.3V
2.5V
1.8V
VOUT
0
1
2
3
4
5
6
7
8
0 20406080100
Out
p
ut Load
(
%
)
Pd - Watts
75V
48V
36V
Safe Operating Area @Vin =48V
20
30
40
50
60
70
80
90
0% 20% 40% 60% 80% 100%
Out
p
ut Load
(
%
)
Ambient Temperature (°C)
200LFM
120LFM
60LFM
Nat Conv
Airflow
For technical support and more information, see inside back cover or visit www.ti.com
17
SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003
PT4828—48V
35-W Triple Output Isolated DC/DC
Converter for Logic Applications
PT4828 Electrical Specifications (Unless otherwise stated, the operating conditions are: Ta =25°C, Vin =48V, and Io =0.5Iomax)
PT4828
Characteristics Symbols Conditions Min Typ Max Units
Output Current IoEach output Io1 (5.0V) 0.25 (1) — 5.0 (2)
Io2 (2.5V) 0.1 (1) — 5.5 (2) A
Io3 (1.5V) 0.1 (1) — 5.5 (2)
Total (Io1 + Io2 + Io3) ——9
(2) A
Input Voltage Range Vin Continuous 36 — 75 V
Surge (1 minute) — — 80
Set-Point Voltage VoVo14.9 5.0 5.1
Vo22.45 2.5 2.55 V
Vo31.47 1.5 1.53
Temperature Variation Regtemp –40°C ≤Ta ≤+85°C, Io =Iomin Vo1— ±0.5 — %Vo
Vo2/Vo3— ±0.5 —
Line Regulation Regline All outputs, Over Vin range — ±0.1 ±0.5 %Vo
Load Regulation Regload All outputs, 0≤Io≤Iomax — ±0.1 ±0.5 %Vo
Total Output Voltage Variation ∆Vo tol Includes set-point, line, load, Vo1— — ±3 (3) %Vo
–40°C ≤Ta ≤+85°C Vo2/Vo3— — ±3 (3)
Efficiency ηIo1 =5A, Io2 =2A, Io3 =2A — 86.5 — %
Vo Ripple/Noise VnVo1—30—
(0 to 20MHz bandwidth) Vo2—30—mV
pp
Vo3—25—
Transient Response ttr 0.1A/µs load step, 50% to 75% Iomax — 200 — µSec
Vos Vo over/undershoot — 5 — %Vo
Output Adjust Range Voadj Vo1/Vo2/Vo3— ±10 — %Vo
Over-Current Threshold ITRIP Total, all outputs. Reset with auto-recovery — 11 — A
Switching Frequency ƒsOver Vin and Io ranges 350 400 450 kHz
Under Voltage Lockout Von Vin increasing — 35.5 — V
Voff Vin decreasing — 34 —
Turn-On Time ton Vin =48V step — 140 (4) —ms
Enable Control (pins 1 & 2) Referenced to –Vin (pin 4)
High-Level Input Voltage VIH 4 — 15 (5) V
Low-Level Input Voltage VIL –0.2 — 0.8
Low-Level Input Current IIL —12mA
Standby Input Current Iin standby pins 1 & 2 open circuit — 1 5 mA
Internal Input Capacitance Cint — 1.14 — µF
External Output Capacitance Co10 220 1,000 (6)
Co20 220 1,000 (6) µF
Co30 220 1,000 (6)
Primary/Secondary Isolation V iso 1500 — — V
C iso — 2,200 — pF
R iso 10——MΩ
Notes:
(1) The converter will operate down to no load with reduced specifications.
(2) The sum-total current from outputs Vo2, and Vo3 cannot exceed 9ADC.
(3) Limits are specified by design.
(4) Measured from the application of the input voltage to the instance that all outputs are in regulation.
(5) The Enable inputs (pins 1 & 2) have internal pull-ups. Leaving pin 1 open-circuit and connecting pin 2 to –Vin allows the the converter to operate when
input power is applied. The maximum open-circuit voltage is 4V.
(6) Ultra-low ESR capacitors, such as organic or polymer aluminum electrolytic types, may cause instability. Consult the factory before using.
For technical support and more information, see inside back cover or visit www.ti.com
18
SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003
PT4828—48V
35-W Triple Output Isolated DC/DC
Converter for Logic Applications
PT4828 Performance Characteristics (See Notes A, B)
Typical Characteristics
Power Dissipation vs Output Load
Note A: All Characteristic data in the above graphs has been developed from actual products tested at 25°C. This data is considered typical data for the ISR.
Note B: Output Load (%) represents the percent drawn from each output of the stated 100% load condition.
Note C: SOA curves represent operating conditions at which the internal components are at or below the manufacturer’s maximum rated operating temperatures.
PT4828 Thermal Performance (See Note C)
(Io1 + Io2 + Io3 =9A ,represents 100% Load)
50
60
70
80
90
100
0 20406080100
Out
p
ut Load
(
%
)
Efficiency - %
36V
48V
75V
VIN
0
20
40
60
80
100
0 20406080100
Iout
(
A
)
Ripple - mV
5.0V
2.5V
1.5V
VOUT
0
20
40
60
80
100
0 20406080100
Out
p
ut Load
(
%
)
Ripple - mV
5.0V
2.5V
1.5V
VOUT
Efficiency vs Output Power
(Io1 =5A, Io2 =2A, Io3 =2A represents 100% Load)
Output Ripple vs Output Power; Vin =48V
(Io1 =5A, Io2 =2A, Io3 =2A represents 100% Load)
Efficiency vs Output Power
(Io1 =2A, Io2 =2A, Io3 =5A represents 100% Load)
Output Ripple vs Output Power; Vin =48V
(Io1 =2A, Io2 =2A, Io3 =5A represents 100% Load)
0
2
4
6
8
10
0 20406080100
Out
p
ut Load
(
%
)
Pd - Watts
75V
48V
36V
VIN
50
60
70
80
90
100
0 20406080100
Out
p
ut Load
(
%
)
Efficiency - %
36V
48V
75V
VIN
Safe Operating Area @Vin =48V
20
30
40
50
60
70
80
90
0% 20% 40% 60% 80% 100%
Out
p
ut Load
(
%
)
Ambient Temperature (°C)
200LFM
120LFM
60LFM
Nat Conv
Airflow
For technical support and more information, see inside back cover or visit www.ti.com
19
SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003
PT4829—48V
35-W Triple Output Isolated DC/DC
Converter for Logic Applications
PT4829 Electrical Specifications (Unless otherwise stated, the operating conditions are: Ta =25°C, Vin =48V, and Io =0.5Iomax)
PT4829
Characteristics Symbols Conditions Min Typ Max Units
Output Current IoEach output Io1 (5.0V) 0.25 (1) — 5.0 (2)
Io2 (1.8V) 0.1 (1) — 5.5 (2) A
Io3 (1.5V) 0.1 (1) — 5.5 (2)
Total (Io1 + Io2 + Io3) ——9
(2) A
Input Voltage Range Vin Continuous 36 — 75 V
Surge (1 minute) — — 80
Set-Point Voltage VoVo14.9 5.0 5.1
Vo21.76 1.8 1.84 V
Vo31.47 1.5 1.53
Temperature Variation Regtemp –40°C ≤Ta ≤+85°C, Io =Iomin Vo1— ±0.5 — %Vo
Vo2/Vo3— ±0.5 —
Line Regulation Regline All outputs, Over Vin range — ±0.1 ±0.5 %Vo
Load Regulation Regload All outputs, 0≤Io≤Iomax — ±0.1 ±0.5 %Vo
Total Output Voltage Variation ∆Vo tol Includes set-point, line, load, Vo1— — ±3 (3) %Vo
–40°C ≤Ta ≤+85°C Vo2/Vo3— — ±3 (3)
Efficiency ηIo1 =5A, Io2 =2A, Io3 =2A — 86.2 — %
Vo Ripple/Noise VnVo1—35—
(0 to 20MHz bandwidth) Vo2—25—mV
pp
Vo3—25—
Transient Response ttr 0.1A/µs load step, 50% to 75% Iomax — 200 — µSec
Vos Vo over/undershoot — 5 — %Vo
Output Adjust Range Voadj Vo1/Vo2/Vo3— ±10 — %Vo
Over-Current Threshold ITRIP Total, all outputs. Reset with auto-recovery — 11 — A
Switching Frequency ƒsOver Vin and Io ranges 350 400 450 kHz
Under Voltage Lockout Von Vin increasing — 35.5 — V
Voff Vin decreasing — 34 —
Turn-On Time ton Vin =48V step — 140 (4) —ms
Enable Control (pins 1 & 2) Referenced to –Vin (pin 4)
High-Level Input Voltage VIH 4 — 15 (5) V
Low-Level Input Voltage VIL –0.2 — 0.8
Low-Level Input Current IIL —12mA
Standby Input Current Iin standby pins 1 & 2 open circuit — 1 5 mA
Internal Input Capacitance Cint — 1.14 — µF
External Output Capacitance Co10 220 1,000 (6)
Co20 220 1,000 (6) µF
Co30 220 1,000 (6)
Primary/Secondary Isolation V iso 1500 — — V
C iso — 2,200 — pF
R iso 10——MΩ
Notes:
(1) The converter will operate down to no load with reduced specifications.
(2) The sum-total current from outputs Vo2, and Vo3 cannot exceed 9ADC.
(3) Limits are specified by design.
(4) Measured from the application of the input voltage to the instance that all outputs are in regulation.
(5) The Enable inputs (pins 1 & 2) have internal pull-ups. Leaving pin 1 open-circuit and connecting pin 2 to –Vin allows the the converter to operate when
input power is applied. The maximum open-circuit voltage is 4V.
(6) Ultra-low ESR capacitors, such as organic or polymer aluminum electrolytic types, may cause instability. Consult the factory before using.
For technical support and more information, see inside back cover or visit www.ti.com
20
SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003
PT4829—48V
35-W Triple Output Isolated DC/DC
Converter for Logic Applications
PT4829 Performance Characteristics (See Notes A, B)
Typical Characteristics
Power Dissipation vs Output Power
Note A: All Characteristic data in the above graphs has been developed from actual products tested at 25°C. This data is considered typical data for the ISR.
Note B: Output Load (%) represents the percent drawn from each output of the stated 100% load condition.
Note C: SOA curves represent operating conditions at which the internal components are at or below the manufacturer’s maximum rated operating temperatures.
PT4829 Thermal Performance (See Note C)
(Io1 + Io2 + Io3 =9A, represents 100% Load)
50
60
70
80
90
100
0 20406080100
Out
p
ut Load
(
%
)
Efficiency - %
36V
48V
75V
VIN
0
2
4
6
8
10
0 20406080100
Out
p
ut Load
(
%
)
Pd - Watts
75V
48V
36V
VIN
50
60
70
80
90
100
0 20406080100
Out
p
ut Load
(
%
)
Efficiency - %
36V
48V
75V
VIN
0
20
40
60
80
100
0 20406080100
Out
p
ut Load
(
%
)
Ripple - mV
5.0V
1.5V
1.8V
VOUT
0
20
40
60
80
100
0 20406080100
Out
p
ut Load
(
%
)
Ripple - mV
5.0V
1.5V
1.8V
VOUT
Efficiency vs Output Power
(Io1 =5A, Io2 =2A, Io3 =2A represents 100% Load)
Output Ripple vs Output Power; Vin =48V
(Io1 =5A, Io2 =2A, Io3 =2A represents 100% Load)
Efficiency vs Output Power
(Io1 =2A, Io2 =2A, Io3 =5A represents 100% Load)
Output Ripple vs Output Power; Vin =48V
(Io1 =2A, Io2 =2A, Io3 =5A represents 100% Load)
Safe Operating Area @Vin =48V
20
30
40
50
60
70
80
90
0% 20% 40% 60% 80% 100%
Out
p
ut Load
(
%
)
Ambient Temperature (°C)
200LFM
120LFM
60LFM
Nat Conv
Airflow
For technical support and more information, see inside back cover or visit www.ti.com
21
SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003
PT4831—48V
35-W Triple Output Isolated DC/DC
Converter for Logic Applications
PT4831 Electrical Specifications (Unless otherwise stated, the operating conditions are: Ta =25°C, Vin =48V, and Io =0.5Iomax)
PT4831
Characteristics Symbols Conditions Min Typ Max Units
Output Current IoEach output Io1 (5.0V) 0.25 (1) — 5.0 (2)
Io2 (3.3V) 0.1 (1) — 5.5 (2) A
Io3 (1.5V) 0.1 (1) — 5.5 (2)
Total (Io1 + Io2 + Io3) ——9
(2) A
Input Voltage Range Vin Continuous 36 — 75 V
Surge (1 minute) — — 80
Set-Point Voltage VoVo14.9 5.0 5.1
Vo23.24 3.3 3.36 V
Vo31.47 1.5 1.53
Temperature Variation Regtemp –40°C ≤Ta ≤+85°C, Io =Iomin Vo1— ±0.5 — %Vo
Vo2/Vo3— ±0.5 —
Line Regulation Regline All outputs, Over Vin range — ±0.1 ±0.5 %Vo
Load Regulation Regload All outputs, 0≤Io≤Iomax — ±0.1 ±0.5 %Vo
Total Output Voltage Variation ∆Vo tol Includes set-point, line, load, Vo1— — ±3 (3) %Vo
–40°C ≤Ta ≤+85°C Vo2/Vo3— — ±3 (3)
Efficiency ηIo1 =5A, Io2 =2A, Io3 =2A — 87 — %
Vo Ripple/Noise VnVo1—40—
(0 to 20MHz bandwidth) Vo2—35—mV
pp
Vo3—25—
Transient Response ttr 0.1A/µs load step, 50% to 75% Iomax — 200 — µSec
Vos Vo over/undershoot — 5 — %Vo
Output Adjust Range Voadj Vo1/Vo2/Vo3— ±10 — %Vo
Over-Current Threshold ITRIP Total, all outputs. Reset with auto-recovery — 11 — A
Switching Frequency ƒsOver Vin and Io ranges 350 400 450 kHz
Under Voltage Lockout Von Vin increasing — 35.5 — V
Voff Vin decreasing — 34 —
Turn-On Time ton Vin =48V step — 140 (4) —ms
Enable Control (pins 1 & 2) Referenced to –Vin (pin 4)
High-Level Input Voltage VIH 4 — 15 (5) V
Low-Level Input Voltage VIL –0.2 — 0.8
Low-Level Input Current IIL —12mA
Standby Input Current Iin standby pins 1 & 2 open circuit — 1 5 mA
Internal Input Capacitance Cint — 1.14 — µF
External Output Capacitance Co10 220 1,000 (6)
Co20 220 1,000 (6) µF
Co30 220 1,000 (6)
Primary/Secondary Isolation V iso 1500 — — V
C iso — 2,200 — pF
R iso 10——MΩ
Notes:
(1) The converter will operate down to no load with reduced specifications.
(2) The sum-total current from outputs Vo1, Vo2, and Vo3 cannot exceed 9ADC.
(3) Limits are specified by design.
(4) Measured from the application of the input voltage to the instance that all outputs are in regulation.
(5) The Enable inputs (pins 1 & 2) have internal pull-ups. Leaving pin 1 open-circuit and connecting pin 2 to –Vin allows the the converter to operate when
input power is applied. The maximum open-circuit voltage is 4V.
(6) Ultra-low ESR capacitors, such as organic or polymer aluminum electrolytic types, may cause instability. Consult the factory before using.
For technical support and more information, see inside back cover or visit www.ti.com
22
SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003
PT4831—48V
35-W Triple Output Isolated DC/DC
Converter for Logic Applications
Typical Characteristics
Note A: All Characteristic data in the above graphs has been developed from actual products tested at 25°C. This data is considered typical data for the ISR.
Note B: Output Load (%) represents the percent drawn from each output of the stated 100% load condition.
Note C: SOA curves represent operating conditions at which the internal components are at or below the manufacturer’s maximum rated operating temperatures.
50
60
70
80
90
100
0 20406080100
Out
p
ut Load
(
%
)
Efficiency - %
36V
48V
75V
VIN
0
2
4
6
8
10
0 20406080100
Out
p
ut Power
(
%
)
Pd - Watts
75V
48V
36V
VIN
50
60
70
80
90
100
0 20406080100
Out
p
ut Load
(
%
)
Efficiency - %
36V
48V
75V
VIN
PT4831 Performance Characteristics (See Notes A, B)
Power Dissipation vs Output Power
PT4831 Thermal Performance (See Note C)
(Io1 + Io2 + Io3 =9A, represents 100% Load)
Efficiency vs Output Power
(Io1 =5A, Io2 =2A, Io3 =2A represents 100% Load)
Output Ripple vs Output Power; Vin =48V
(Io1 =5A, Io2 =2A, Io3 =2A represents 100% Load)
Efficiency vs Output Power
(Io1 =2A, Io2 =2A, Io3 =5A represents 100% Load)
Output Ripple vs Output Power; Vin =48V
(Io1 =2A, Io2 =2A, Io3 =5A represents 100% Load)
0
20
40
60
80
100
0 20406080100
Out
p
ut Load
(
%
)
Ripple - mV
3.3V
5.0V
1.5V
VOUT
0
20
40
60
80
100
0 20406080100
Out
p
ut Load
(
%
)
Ripple - mV
3.3V
5.0V
1.5V
VOUT
Safe Operating Area @Vin =48V
20
30
40
50
60
70
80
90
0% 20% 40% 60% 80% 100%
Out
p
ut Load
(
%
)
Ambient Temperature (°C)
200LFM
120LFM
60LFM
Nat Conv
Airflow
For technical support and more information, see inside back cover or visit www.ti.com
23
SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003
PT4832—48V
35-W Triple Output Isolated DC/DC
Converter for Logic Applications
PT4832 Electrical Specifications (Unless otherwise stated, the operating conditions are: Ta =25°C, Vin =48V, and Io =0.5Iomax)
PT4832
Characteristics Symbols Conditions Min Typ Max Units
Output Current IoEach output Io1 (5.0V) 0.25 (1) — 5.0 (2)
Io2 (3.3V) 0.1 (1) — 5.5 (2) A
Io3 (2.5V) 0.1 (1) — 5.5 (2)
Total (Io1 + Io2 + Io3) ——9
(2) A
Input Voltage Range Vin Continuous 36 — 75 V
Surge (1 minute) — — 80
Set-Point Voltage VoVo14.9 5.0 5.1
Vo23.24 3.3 3.36 V
Vo32.45 2.5 2.55
Temperature Variation Regtemp –40°C ≤Ta ≤+85°C, Io =Iomin Vo1— ±0.5 — %Vo
Vo2/Vo3— ±0.5 —
Line Regulation Regline All outputs, Over Vin range — ±0.1 ±0.5 %Vo
Load Regulation Regload All outputs, 0≤Io≤Iomax — ±0.1 ±0.5 %Vo
Total Output Voltage Variation ∆Vo tol Includes set-point, line, load, Vo1— — ±3 (3) %Vo
–40°C ≤Ta ≤+85°C Vo2/Vo3— — ±3 (3)
Efficiency ηIo1 =5A, Io2 =2A, Io3 =2A — 86.7 — %
Vo Ripple/Noise VnVo1—30—
(0 to 20MHz bandwidth) Vo2—25—mV
pp
Vo3—25—
Transient Response ttr 0.1A/µs load step, 50% to 75% Iomax — 200 — µSec
Vos Vo over/undershoot — 5 — %Vo
Output Adjust Range Voadj Vo1/Vo2/Vo3— ±10 — %Vo
Over-Current Threshold ITRIP Total, all outputs. Reset with auto-recovery — 11 — A
Switching Frequency ƒsOver Vin and Io ranges 350 400 450 kHz
Under Voltage Lockout Von Vin increasing — 35.5 — V
Voff Vin decreasing — 34 —
Turn-On Time ton Vin =48V step — 140 (4) —ms
Enable Control (pins 1 & 2) Referenced to –Vin (pin 4)
High-Level Input Voltage VIH 4 — 15 (5) V
Low-Level Input Voltage VIL –0.2 — 0.8
Low-Level Input Current IIL —12mA
Standby Input Current Iin standby pins 1 & 2 open circuit — 1 5 mA
Internal Input Capacitance Cint — 1.14 — µF
External Output Capacitance Co10 220 1,000 (6)
Co20 220 1,000 (6) µF
Co30 220 1,000 (6)
Primary/Secondary Isolation V iso 1500 — — V
C iso — 2,200 — pF
R iso 10——MΩ
Notes:
(1) The converter will operate down to no load with reduced specifications.
(2) The sum-total current from outputs Vo2, and Vo3 cannot exceed 9ADC.
(3) Limits are specified by design.
(4) Measured from the application of the input voltage to the instance that all outputs are in regulation.
(5) The Enable inputs (pins 1 & 2) have internal pull-ups. Leaving pin 1 open-circuit and connecting pin 2 to –Vin allows the the converter to operate when
input power is applied. The maximum open-circuit voltage is 4V.
(6) Ultra-low ESR capacitors, such as organic or polymer aluminum electrolytic types, may cause instability. Consult the factory before using.
For technical support and more information, see inside back cover or visit www.ti.com
24
SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003
PT4832—48V
35-W Triple Output Isolated DC/DC
Converter for Logic Applications
PT4832 Performance Characteristics (See Notes A, B)
Typical Characteristics
Power Dissipation vs Output Power
Note A: All Characteristic data in the above graphs has been developed from actual products tested at 25°C. This data is considered typical data for the ISR.
Note B: Output Load (%) represents the percent drawn from each output of the stated 100% load condition.
Note C: SOA curves represent operating conditions at which the internal components are at or below the manufacturer’s maximum rated operating temperatures.
PT4832 Thermal Performance (See Note C)
(Io1 + Io2 + Io3 =9A, represents 100% Load)
Efficiency vs Output Power
(Io1 =5A, Io2 =2A, Io3 =2A represents 100% Load)
Output Ripple vs Output Power; Vin =48V
(Io1 =5A, Io2 =2A, Io3 =2A represents 100% Load)
Efficiency vs Output Power
(Io1 =2A, Io2 =2A, Io3 =5A represents 100% Load)
Output Ripple vs Output Power; Vin =48V
(Io1 =2A, Io2 =2A, Io3 =5A represents 100% Load)
50
60
70
80
90
100
0 20406080100
Out
p
ut Load
(
%
)
Efficiency - %
36V
48V
75V
VIN
50
60
70
80
90
100
0 20406080100
Out
p
ut Load
(
%
)
Efficiency - %
36V
48V
75V
VIN
0
20
40
60
80
100
0 20406080100
Out
p
ut Load
(
%
)
Ripple - mV
5.0V
3.3V
2.5V
VOUT
0
20
40
60
80
100
0 20406080100
Out
p
ut Load
(
%
)
Ripple - mV
5.0V
3.3V
2.5V
VOUT
0
2
4
6
8
0 20406080100
Out
p
ut Load
(
%
)
Pd - Watts
36V
48V
75V
VIN
Safe Operating Area @Vin =48V
20
30
40
50
60
70
80
90
0% 20% 40% 60% 80% 100%
Out
p
ut Load
(
%
)
Ambient Temperature (°C)
200LFM
120LFM
60LFM
Nat Conv
Airflow
For technical support and more information, see inside back cover or visit www.ti.com
25
SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003
PT4833—48V
35-W Triple Output Isolated DC/DC
Converter for Logic Applications
PT4833 Electrical Specifications (Unless otherwise stated, the operating conditions are: Ta =25°C, Vin =48V, and Io =0.5Iomax)
PT4833
Characteristics Symbols Conditions Min Typ Max Units
Output Current IoEach output Io1 (3.3V) 0.25 (1) —8
(2)
Io2 (2.0V) 0.1 (1) —6
(2) A
Io3 (1.5V) 0.1 (1) —6
(2)
Total (Io1 + Io2 + Io3) ——12
(2) A
Input Voltage Range Vin Continuous 36 — 75 V
Surge (1 minute) — — 80
Set-Point Voltage VoVo13.24 3.3 3.36
Vo21.96 2.0 2.04 V
Vo31.47 1.5 1.53
Temperature Variation Regtemp –40°C ≤Ta ≤+85°C, Io =Iomin Vo1— ±0.5 — %Vo
Vo2/Vo3— ±0.5 —
Line Regulation Regline All outputs, Over Vin range — ±0.1 ±0.5 %Vo
Load Regulation Regload All outputs, 0≤Io≤Iomax — ±0.1 ±0.5 %Vo
Total Output Voltage Variation ∆Vo tol Includes set-point, line, load, Vo1— — ±3 (3) %Vo
–40°C ≤Ta ≤+85°C Vo2/Vo3— — ±3 (3)
Efficiency ηIo1 =6A, Io2 =2A, Io3 =2A — 86 — %
Vo Ripple/Noise VnVo1—40—
(0 to 20MHz bandwidth) Vo2—25—mV
pp
Vo3—25—
Transient Response ttr 0.1A/µs load step, 50% to 75% Iomax — 200 — µSec
Vos Vo over/undershoot — 3 — %Vo
Output Adjust Range Voadj Vo1/Vo2/Vo3— ±10 — %Vo
Over-Current Threshold ITRIP Total, all outputs. Reset with auto-recovery — 14 — A
Switching Frequency ƒsOver Vin and Io ranges 350 400 450 kHz
Under Voltage Lockout Von Vin increasing — 35.5 — V
Voff Vin decreasing — 34 —
Turn-On Time ton Vin =48V step — 140 (4) —ms
Enable Control (pins 1 & 2) Referenced to –Vin (pin 4)
High-Level Input Voltage VIH 4 — 15 (5) V
Low-Level Input Voltage VIL –0.2 — 0.8
Low-Level Input Current IIL —12mA
Standby Input Current Iin standby pins 1 & 2 open circuit — 1 5 mA
Internal Input Capacitance Cint — 1.14 — µF
External Output Capacitance Co10 220 1,000 (6)
Co20 220 1,000 (6) µF
Co30 220 1,000 (6)
Primary/Secondary Isolation V iso 1500 — — V
C iso — 2,200 — pF
R iso 10——MΩ
Notes:
(1) The converter will operate down to no load with reduced specifications.
(2) The sum-total current from outputs Vo1, Vo2, and Vo3 cannot exceed 12ADC.
(3) Limits are specified by design.
(4) Measured from the application of the input voltage to the instance that all outputs are in regulation.
(5) The Enable inputs (pins 1 & 2) have internal pull-ups. Leaving pin 1 open-circuit and connecting pin 2 to –Vin allows the the converter to operate when
input power is applied. The maximum open-circuit voltage is 4V.
(6) Ultra-low ESR capacitors, such as organic or polymer aluminum electrolytic types, may cause instability. Consult the factory before using.
For technical support and more information, see inside back cover or visit www.ti.com
26
SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003
PT4833—48V
35-W Triple Output Isolated DC/DC
Converter for Logic Applications
Typical Characteristics
Note A: All Characteristic data in the above graphs has been developed from actual products tested at 25°C. This data is considered typical data for the ISR.
Note B: Output Load (%) represents the percent drawn from each output of the stated 100% load condition.
Note C: SOA curves represent operating conditions at which the internal components are at or below the manufacturer’s maximum rated operating temperatures.
PT4833 Performance Characteristics (See Note A, B) PT4833 Thermal Performance (See Note C)
(Io1 + Io2 + Io3 =12A, represents 100% Load)
Efficiency vs Output Power
(Io1 =8A, Io2 =2A, Io3 =2A represents 100% Load)
Output Ripple vs Output Power; Vin =48V
(Io1 =8A, Io2 =2A, Io3 =2A represents 100% Load)
Efficiency vs Output Power
(Io1 =4A, Io2 =4A, Io3 =4A represents 100% Load)
Output Ripple vs Output Power; Vin =48V
(Io1 =4A, Io2 =4A, Io3 =4A represents 100% Load)
Power Dissipation vs Output Load
Safe Operating Area @Vin =48V
20
30
40
50
60
70
80
90
0% 20% 40% 60% 80% 100%
Out
p
ut Power
(
%
)
Ambient Temperature (°C)
200LFM
120LFM
60LFM
Nat Conv
Airflow
50
60
70
80
90
100
0 20406080100
Out
p
ut Load
(
%
)
Efficiency - %
36V
48V
75V
VIN
50
60
70
80
90
100
0 20406080100
Out
p
ut Load
(
%
)
Efficiency - %
36V
48V
75V
VIN
0
20
40
60
80
100
0 20406080100
Out
p
ut Load
(
%
)
Ripple - mV
3.3V
2.0V
1.5V
VOUT
0
2
4
6
8
10
0 20406080100
Out
p
ut Load
(
%
)
Pd - Watts
75V
48V
36V
VIN
0
20
40
60
80
100
0 20406080100
Out
p
ut Load
(
%
)
Ripple - mV
3.3V
2.0V
1.5V
VOUT
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
27
PT4820 Series
Operating Features of the PT4820 Triple-Output
DC/DC Converters
Short-Circuit Protection
To protect against load faults the PT4820 series of triple-
output DC/DC converters incorporate output short-circuit
protection. When the combined output current from all
three outputs exceeds the over-current threshold (see data
sheet specifications), the PT4820 shuts down after a short
period of typically 15ms. This forces the output voltage
at all three regulated outputs to simultaneously fall to zero.
Following shutdown, the module automatically attempts
to recover by executing a soft-start power-up. This occurs
at intervals of approximately 65ms. If the load fault persists,
the module will continually cycle through successive over-
current trips and restarts.
Over-Temperature Protection
The PT4820 DC/DC converter series have an internal
temperature sensor, which monitors the temperature of
the module’s metal case. If the case temperature exceeds
a nominal 110°C the converter will shut down. The
converter will automatically restart when the sensed
temperature returns to about 100°C.
Under-Voltage Lock-Out
The Under-Voltage Lock-Out (UVLO) circuit prevents
operation of the converter whenever the input voltage to
the module is insufficient to maintain output regulation.
The UVLO has approximately 2V of hysterisis. This is
to prevent oscillation with a slowly changing input voltage.
Below the UVLO threshold the module is off and the
enable control inputs, EN1 and EN2 are inoperative.
On/Off Output Voltage Sequencing
The power-up characteristic of the PT4820 series of
DC/DC converters meets the requirements of micropro-
cessor and DSP chipsets. All three outputs are internally
sequenced to power-up in unison. Figure 1-1 shows the
PT4820 output voltage rise times and characteristic
shapes after either power is applied to the input of the
converter, or the converter is enabled using one of the
enable control inputs. All three output voltages rise
simultaneously and monotonically until each reaches its
respective output voltage. There is no turn-on overshoot
and the output voltages are proportional to each other
during power on.
Turn-On Time
The turn-on on time varies with the input voltage. The
typical turn-on time (measured from the application of a
valid input voltage to instance all outputs are in regulation)
is typically 140 milliseconds at Vin =48V. The rise time
of the output voltage is between 10 and 15 milliseconds.
Primary-Secondary Isolation
The PT4820 series of DC/DC converters incorporate
electrical isolation between the input terminals (primary)
and the output terminals (secondary). All converters are
production tested to a withstand voltage of 1500VDC.
The isolation complies with UL60950 and EN60950,
and the requirements for operational isolation. This
allows the converter to be configured for either a positive
or negative input voltage source.
The regulation control circuitry for these modules is
located on the secondary (output) side of the isolation
barrier. Control signals are passed between the primary
and secondary sides of the converter. The data sheet ‘Pin
Descriptions’ and ‘Pin-Out Information’ provides guid-
ance as to which reference, primary or secondary, each
pin is associated.
Input Current Limiting
The converter is not internally fused. For safety and
overall system protection, the maximum input current to
the converter must be limited. Active or passive current
limiting can be used. Passive current limiting can be a
fast acting fuse. A 125-V fuse, rated no more than 5A, is
recommended. Active current limiting can be imple-
mented with a current limited “Hot-Swap” controller.
Figure 1-1; Vo1, Vo2, Vo3 Power-Up Sequence
Vo1 (0.5V/Div)
Vo2 (0.5V/Div)
Vo3 (0.5V/Div)
HORIZ. SCALE: 2ms/Div
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
28
PT4820 Series
On/Off Enable Turn-On Time
When the On/Off enable inputs, EN1 or EN2 are used
to enable the PT4820's output voltages, the turn-on
delay time (measured from the transition of the enable
signal to the instance the outputs begin to rise) will vary
with the input voltage and the module’s internal timing.
At an input voltage of 48V, the total turn-on time is
between 20 and 60 milliseconds. This turn-on time
reduces as the input voltage is increased. The rise time
of the output voltages is between 10 and 15 milliseconds.
Using the On/Off Enable Controls on the PT4820
Series of Triple Output DC/DC Converters
The PT4820 (48V input) series of triple-output DC/DC
converters incorporate two output enable controls. EN1
(pin 1) is the Positive Enable input, and EN2 (pin 2) is the
Negative Enable input. Both inputs are electrically refer-
enced to -Vin (pin 4) on the primary or input side of the
converter. The Enable pins are ideally controlled with an
open-collector (or open-drain) discrete transistor. A pull-
up resistor is not required. If a pull-up resistor is added,
the pull-up voltage must be limited to 15V.
Automatic (UVLO) Power-Up
Connecting EN2 (pin 2) to -Vin (pin 4) and leaving EN1
(pin 1) open-circuit configures the converter for auto-
matic power up. (See data sheet “Typical Application”).
The converter control circuitry incorporates an “Under
Voltage Lockout” (UVLO) function, which disables the
converter until the minimum specified input voltage is
present at ±Vin. (See data sheet Specifications). The UVLO
circuitry ensures a clean transition during power-up and
power-down, allowing the converter to tolerate a slow-
rising input voltage. For most applications EN1 and
EN2, can be configured for automatic power-up.
Positive Output Enable (Negative Inhibit)
To configure the converter for a positive enable func-
tion, connect EN2 (pin 2) to -Vin (pin 4), and apply the
system On/Off control signal to EN1 (pin 1). In this
configuration, applying less than 0.8V (with respect to
-Vin potential) to pin 1 disables the converter outputs.
Figure 2-1 is an example of this implemention using a
buffer transistor.
DC/DC
Module
EN 1
EN 2
–Vin
–VIN
1 =Outputs Off
1
2
4
BSS138
DC/DC
Module
EN 1
EN 2
–Vin
–VIN
1 =Outputs On
1
2
4
BSS138
Figure 2-2; Negative Enable Configuration
Figure 2-1; Positive Enable Configuration
Negative Output Enable (Positive Inhibit)
To configure the converter for a negative enable function,
EN1 (pin 1) is left open circuit, and the system On/Off
control signal is applied to EN2 (pin 2). Applying less
than 0.8V (with respect to -Vin potential) to pin 2, enables
the converter outputs. An example using a buffer transistor
is again detailed in Figure 2-2. Note: The converter will
only produce and output voltage if a valid input voltage is
applied to ±Vin.
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
29
Adjusting the Output Voltages of the PT4820
Triple-Output DC/DC Converters
The output voltages of the PT4820 series of triple-output
DC/DC converters, Vo1, Vo2 and Vo3 are independently
adjustable. The adjustment method uses a single external
resistor, 1 which may be used to adjust a selected output
by up to a nominal ±10% from the factory preset value.
The value of the resistor determines the magnitude of
adjustment, and the placement of the resistor determines
the direction of adjustment (up or down). Resistor val-
ues can be calculated using the appropriate formula (see
below) and the constants provided in Table 3-2. Alter-
natively the value may be selected directly from Table
3-3. The placement of each resistor is detailed as fol-
lows.
Adjust Up: To increase a specific output, add a resistor R1
between the appropriate Vox Adj (Vo1 Adj, Vo2 Adj, or
Vo3 Adj) and the output common (COM). See Fig-
ure 3-1(a) and Table 3-1 for the resistor placement and
pin connections.
Figure 3-1b
PT4820 Series
Calculation of Adjust Values
The adjust resistor values may be calculated. Use the
applicable formula and select the appropriate constants
from Table 2 for the output and model being adjusted.
R1 [Adjust Up] 3 = Ro · Vr– RskΩ
Va – Vo
(R2) [Adjust Down] 3 =Ro (Va – Vr )
– RskΩ
Vo – Va
Where: Vo= Original output voltage
Va= Adjusted output voltage
Vr= The reference voltage from Table 3-2
Ro= The resistance value in Table 3-2
Rs= The series resistance from Table 3-2
(R
2
)
+Vo
x
+V
x
Adj
COM
+Vox
(Adjusted Down)
Output
Common
PT4820
9,10,14,18
#
#
# - See Table 3-1 for pin connections,
where Vo
x
equals Vo
1
, Vo
2
, or Vo
3
Figure 3-1a
R
1
+Vo
x
+V
x
Adj
COM
+Vox
(Adjusted Up)
Output
Common
PT4820
9,10,14,18
#
#
# - See Table 3-1 for pin connections,
where Vo
x
equals Vo
1
, Vo
2
, or Vo
3
Adjust Down: Add a resistor (R2), between the appropriate
Vox Adj (Vo1, Vo2, or Vo3) and the output being adjusted.
See Figure 3-1(b) and Table 1 for the resistor placement
and pin connections.
Table 3-1; Adjust Resistor Pin Connections
To Adjust Up To Adjust Down
Connect R1Connect (R2)
from to from to
Vox Adj COM Vox Adj Vox
Vo111 10 11 12
Vo215 14 15 16
Vo319 18 19 20
Notes:
1. Use only a single 1% (or better) tolerance resistor in
either the R1 or (R2) location to adjust a specific output.
Place the resistor as close to the ISR as possible.
2. Never connect capacitors to any of the ‘Vox Adj’ pins. Any
capacitance added to these control pins will affect the
stability of the respective regulated output.
3. Adjustments made to any output must also comply with
the following limitations.
Vo1≥ (Vo2 + 0.5V), and
Vo1≥ (Vo3 + 0.5V)
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
continued
30
Vo (nom) 2.0V 1.8V 1.5V 1.2V
Va (req’d)
Table 3-3
PT4820 Series
1.080 (2.6)kΩ
1.100 (5.8)kΩ
1.120 (10.6)kΩ
1.140 (18.6)kΩ
1.160 (34.7)kΩ
1.180 (82.7)kΩ
1.200
1.220 486.0kΩ
1.240 241.0kΩ
1.260 160.0kΩ
1.280 119.0kΩ
1.300 94.2kΩ
1.320 77.9kΩ
1.350 (0.9)kΩ
1.375 (3.6)kΩ
1.400 (7.8)kΩ
1.425 (14.6)kΩ
1.450 (28.4)kΩ
1.475 (69.6)kΩ
1.500
1.525 362.0kΩ
1.550 178.0kΩ
1.575 117.0kΩ
1.600 86.5kΩ
1.620 (4.5)kΩ71.2kΩ
1.650 (12.2)kΩ55.9kΩ
1.700 (35.4)kΩ
1.750 (105.0)kΩ
1.800 (4.4)kΩ
1.850 (17.6)kΩ274.0kΩ
1.900 (43.9)kΩ126.0kΩ
1.950 (123.0)kΩ76.7kΩ
2.000
2.050 225.0kΩ
2.100 100.0kΩ
2.150 58.4kΩ
2.200 37.6kΩ
R1 = (Blue) R2 = Black
Vo (nom) 5.0V 3.3V 2.5
Va (req’d)
Vo1, Vo2, & Vo3 OUTPUT VOLTAGE ADJUST RESISTOR VALUES (See Note 3 for adjustment limitations)
2.25 (1.6)kΩ
2.3 (14.6)kΩ
2.35 (36.3)kΩ
2.4 (79.6)kΩ
2.45 (210.0)kΩ
2.5
2.55 210.0kΩ
2.6 84.7kΩ
2.65 43.1kΩ
2.7 22.3kΩ
2.75 9.8kΩ
2.97 (18.0)kΩ
3.0 (24.9)kΩ
3.05 (40.1)kΩ
3.1 (62.9)kΩ
3.15 (101.0)kΩ
3.2 (177.0)kΩ
3.25 (405.0)kΩ
3.3
3.35 229.0kΩ
3.4 94.5kΩ
3.45 49.6kΩ
3.5 27.2kΩ
3.55 13.7kΩ
3.6 4.7kΩ
3.63 0.6kΩ
•
4.5 (67.7)kΩ
4.6 (96.7)kΩ
4.7 (145.0)kΩ
4.8 (242.0)kΩ
4.9 (533.0)kΩ
5.0
5.1 155.0kΩ
5.2 61.1kΩ
5.3 29.7kΩ
5.4 14.0kΩ
5.5 4.5kΩ
Table 3-2
Vo1, Vo2, & Vo3 OUTPUT VOLTAGE ADJUSTMENT RANGE AND FORMULA PARAMETERS
Vo (nom) 5.0V 3.3V 2.5V 2.0V 1.8V 1.5V 1.2V
Va (min) 4.5V 2.97V 2.25V 1.8V 1.62V 1.35V 1.08V
Va (max) 5.5V 3.63V 2.75V 2.2V 1.98V 1.65V 1.32V
Vr1.225V 1.225V 1.225V 1.225 1.225V 1.225V 1.003V
Ro (kΩΩ
ΩΩ
Ω)15.4 11.0 10.2 10.2 12.1 7.5 9.76
Rs (kΩΩ
ΩΩ
Ω)33.2 40.2 40.2 24.9 22.1 5.36 3.65
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
31
VDE Approved Installation Instructions (Installationsanleitung)
Nennspannnug (Rated Voltage): PT4820 36 to 72 Vdc, Transient to 80Vdc
Nennaufnahme (Rated Input): PT4820 1.5 Adc
Nennleistung (Rated Power): 40 Watts Maximum
Ausgangsspannung (Sec. Voltage): PT4820 Series
PT4821, +3.3/ +2. 5/ +1.5 Vdc; 8.0/ 6 .0/ 6 .0 Adc; Max total is 12Adc
PT4822, +3.3/ +1.8/ +1.5 Vdc; 8.0/ 6 .0/ 6.0 Adc; Max total is 12Adc
Ausgangsstrom (Sec. Current): PT4823, +3.3/ +2.5/ +1.2 Vdc; 8.0/ 6.0/ 6.0 Adc; Max total is 12Adc
oder (or) PT4824, +3.3/ +1.8/ +1.2 Vdc; 8.0/ 6.0/ 6.0 Adc; Max total is 12Adc
Ausgangsleistung (Sec. Power): PT4825, +3.3/ +1.5/ +1.2 Vdc; 8.0/ 6.0/ 6.0 Adc; Max total is 12Adc
PT4826, +5.0/ +3.3/ +1.8 Vdc; 5.0/ 5.5 /5.5 Adc; Max total is 9Adc
PT4827, +3.3/ +2.5/ +1.8 Vdc; 8.0/ 6.0 /6.0 Adc; Max total is 12Adc
PT4828, +5.0/ +2.5/ +1.5 Vdc; 5.0/ 5.5 /5.5 Adc; Max total is 9Adc
PT4829, +5.0/ +1.8/ +1.5 Vdc; 5.0/ 5.5 /5.5 Adc; Max total is 9Adc
PT4831, +5.0/ +3.3/ +1.5 Vdc; 5.0/ 5.5 /5.5 Adc; Max total is 9Adc
PT4832, +5.0/ +3.3/ +2.5 Vdc; 5.0/ 5.5 /5.5 Adc; Max total is 9Adc
Angabe der Umgebungstemperatur
(Infor mation on ambient temperature): +85 °C maximum as tested
Besondere Hinweise (Special Instructions):
Es ist vorzusehen, daß die Spannungsversorgung in einer Endanwendung über eine isolierte
Sekundaerschaltung bereit gestellt wird. Die Eingangspannung der Spannungsversorgungsmodule muss
eine verstaer kte Isolierung von der Wechselstromquelle aufweisen.
Die Spannungsversorgung muss gemaess den Gehaeuse-, Montage-, Kriech- und Luftstrecken-,
Markierungs- und Trennanforderungen der Endanwendung installiert werden.
(The power supply is intended to be supplied by isolated secondary circuitry in an end use application.
The input power to these power supplies shall have reinforced insulation from the AC mains.
The power supply shall be installed in compliance with the enclosure, mounting, creepage, clearance,
casualty, markings, and segregation requirements of the end-use application.
Offenbach,
VDE Prüf- und Zertifizierungsinstitut
Abteilung /
Department TD
(Jürgen Bärwinkel)
Or t /
Place
: Datum /
Date
: Nov 6, 2002
(Stempel und Unterschrift des Herstellers / Stamp
and signature of the manufacturer)
PT4820 Series
PACKAGE OPTION ADDENDUM
www.ti.com 28-Aug-2012
Addendum-Page 1
PACKAGING INFORMATION
Orderable Device Status (1) Package Type Package
Drawing Pins Package Qty Eco Plan (2) Lead/
Ball Finish MSL Peak Temp (3) Samples
(Requires Login)
PT4821C OBSOLETE SIP MODULE ENP 21 TBD Call TI Call TI
PT4823C NRND SIP MODULE ENP 21 8 TBD Call TI Level-3-215C-168HRS
PT4826A NRND SIP MODULE ENN 21 8 TBD Call TI Level-1-215C-UNLIM
PT4826C NRND SIP MODULE ENP 21 8 TBD Call TI Level-3-215C-168HRS
PT4828C NRND SIP MODULE ENP 21 8 TBD Call TI Level-3-215C-168HRS
PT4829C NRND SIP MODULE ENP 21 8 TBD Call TI Level-3-215C-168HRS
PT4831C OBSOLETE SIP MODULE ENP 21 TBD Call TI Call TI
PT4833C NRND SIP MODULE ENP 21 8 TBD Call TI Level-3-215C-168HRS
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability
information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that
lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight
in homogeneous material)
(3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
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