1
FEATURES
DESCRIPTION
L
O
A
D
SENSE (–)
SENSE (+)
PTQA430xxxN
52
7
Adjust
8
6
4
1
3
+VO
Sense(+)
−VO
Sense(−)
+VI
−VI
+VI
−VI
+VO
−VO
CI
(Optional) CO
(Optional)
Remote
On/Off
PTQA430025 , PTQA430033 , PTQA420050
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................................................................................................................................................... SLTS261C – MAY 2006 – REVISED SEPTEMBER 2009
100-W 48-V INPUT ISOLATED DC/DC CONVERTER
•100-W Output•Input Voltage Range: 36 V to 75 V
The PTQA series of power modules are single-outputisolated DC/DC converters, housed in an industry•92% Efficiency
standard quarter-brick package. These modules are•1500 Vdc Isolation
rated up to 100W with a maximum load current of up•Fast Transient Response
to 30 A.•On/Off Control
The PTQA series operates from a standard 48-V•Overcurrent Protection
telecom central office (CO) supply and occupies only3.3 in
2
of PCB area. The modules offer OEMs a•Differential Remote Sense
compact and flexible high-output power source in an•Adjustable Output Voltage
industry standard footprint. They are suitable for•Output Overvoltage Protection
distributed power applications in both telecom andcomputing environments, and may be used for•Over-Temperature Shutdown
powering high-end microprocessors, DSPs, general•Undervoltage Lockout
purpose logic and analog.•Standard 1/4-Brick Footprint
Features include a remote On/Off control with•UL Safety Agency Approval
optional logic polarity, an undervoltage lockout(UVLO), a differential remote sense, and an industrystandard output voltage adjustment using an externalresistor. Protection features include outputovercurrent protection (OCP), overvoltage protection(OVP), and thermal shutdown (OTP).
The modules are fully integrated for stand-aloneoperation, and require no additional components.
STANDARD APPLICATION
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of TexasInstruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Copyright © 2006 – 2009, Texas Instruments IncorporatedProducts conform to specifications per the terms of the TexasInstruments standard warranty. Production processing does notnecessarily include testing of all parameters.
ABSOLUTE MAXIMUM RATING
PTQA430025 , PTQA430033 , PTQA420050
SLTS261C – MAY 2006 – REVISED SEPTEMBER 2009 ...................................................................................................................................................
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These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foamduring storage or handling to prevent electrostatic damage to the MOS gates.
ORDERING INFORMATION
For the most current package and ordering information, see the Package Option Addendum at the end of this datasheet, or see the TIwebsite at www.ti.com.
PART NUMBERING SCHEME
Input Output
Output Voltage Enable Electrical Options Pin StyleVoltage Current
PTQA 4 30 033 N 2 A D
4 = 48 V 30 = 30A 025 = 2.5 V N = Negative 2 = V
O
Adjust D = Through-hole, Pb-free20 = 20A 033 = 3.3 V P = Positive S = SMD, SnPb solder ball050 = 5.0 V Z = SMD, SnAgCu solder ball
UNIT
T
A
Operating Temperature Over V
I
Range – 40 ° C to 85 ° C
(1)
Range
V
I,
Continuous voltage 80 VMaximum Input VoltageMAX
Peak voltage for 100 ms duration 100 VPTQA420050x2
100 WP
O,
Maximum Output Power PTQA430033x2MAX
PTQA430025x2 75 WT
S
Storage Temperature – 40 ° C to 125 ° CAD Suffix 250 GPer Mil-STD-883, Method 2002.3 1 ms, 1/2Mechanical Shock
Sine, mounted
AS or AZ Suffix 175 GAD Suffix 15 GPer Mil-STD-883, Method 2007.2 20-2000 Hz,Mechanical Vibrarion
PCB mounted
AS or AZ Suffix 2.5 GWeight 30 gramsFlammability Meets UL 94V-O
(1) See SOA curves or consult factory for appropriate derating.
2Submit Documentation Feedback Copyright © 2006 – 2009, Texas Instruments Incorporated
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ELECTRICAL CHARACTERISTICS PTQA430025
PTQA430025 , PTQA430033 , PTQA420050
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................................................................................................................................................... SLTS261C – MAY 2006 – REVISED SEPTEMBER 2009
(Unless otherwise stated, T
A
=25 ° C, V
I
= 48 V, V
O
= 2.5 V, C
O
= 0 µF, and I
O
= I
O
max)
PTQA430025PARAMETER TEST CONDITIONS
MIN TYP MAX UNIT
I
O
Output Current Over V
I
range 0 30 AV
I
Input Voltage Range Over I
O
Range 36 48 75 VV
O
tol Set Point Voltage ± 1
(1)
%V
OToleranceReg
temp
Temperature Variation – 40 ° C > T
A
> 85 ° C ± 1.15 %V
O
Reg
line
Line Regulation Over V
I
range ± 5 mVReg
load
Load Regulation Over I
O
range ± 5 mV
ΔV
o
tot Total Output Voltage Includes set-point, line, load, – 40 ° C > T
A
> 85 ° C ± 1.5 ± 3 %V
OVariation
ΔV
ADJ
Output Adjust Range P
O
≤75 W – 20 10 %V
O
ηEfficiency I
O
= 50% I
O
max 91%V
R
V
O
Ripple (pk-pk) 20 MHz bandwidth 50 100 mV
pp
t
tr
0.1 A/ µs slew rate, 50% to 75% I
O
max 150 µsTransient ResponseΔV
tr
V
O
over/undershoot 25 mVI
TRIP
Overcurrent Threshold Shutdown, followed by auto-recovery 41 AOVP Output Overvoltage Output shutdown and latch off 120 %V
OProtectionOTP Over Temperature Temperature Measurement at thermal sensor. Hysteresis = 10 ° C 105 ° CProtection nominal.f
s
Switching Frequency Over V
I
range 300 kHzV
OFF
V
I
decreasing, I
O
= 6 A 32.5UVLO Undervoltage Lockout VV
HYS
Hysteresis 1.5On/Off Input: Negative Enable
V
IH
Input High Voltage 2.4 Open
(2)Referenced to – V
I
VV
IL
Input Low Voltage – 0.2 0.8I
IL
Input Low Current – 0.3 mAOn/Off Input: Positive Enable
V
IH
Input High Voltage 4.5 Open
(2)Referenced to – V
I
VV
IL
Input Low Voltage – 0.2 0.8I
IL
Input Low Current – 0.5 mAI
ISB
Standby Input Current Output disabled (pin 2 status set to Off) 37 mAC
I
External Input Capacitance Between +V
I
and – V
I
100 µFC
O
External Output Between +V
O
and – V
O
0 30000 µFCapacitance
Isolation Voltage Input-to-output and input-to-case 1500 VdcIsolation Capacitance Input-to-output 1200 pFIsolation Resistance Input-to-output 10 M Ω
(1) If Sense( – ) is not used, pin 5 must be connected to pin 4 for optimum output voltage accuracy.(2) The Remote On/Off input has an internal pull-up and may be controlled with an open collector (drain) interface. An open circuitcorrelates to a logic high. Consult the application notes for interface considerations.
Copyright © 2006 – 2009, Texas Instruments Incorporated Submit Documentation Feedback 3
Product Folder Link(s): PTQA430025 PTQA430033 PTQA420050
ELECTRICAL CHARACTERISTICS PTQA430033
PTQA430025 , PTQA430033 , PTQA420050
SLTS261C – MAY 2006 – REVISED SEPTEMBER 2009 ...................................................................................................................................................
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(Unless otherwise stated, T
A
=25 ° C, V
I
= 48 V, V
O
= 3.3 V, C
O
= 0 µF, and I
O
= I
O
max)
PTQA430033PARAMETER TEST CONDITIONS
MIN TYP MAX UNIT
I
O
Output Current Over V
I
range 0 30 AV
I
Input Voltage Range Over I
O
Range 36 48 75 VV
O
tol Set Point Voltage ± 1
(1)
%V
OToleranceReg
temp
Temperature Variation – 40 ° C > T
A
> 85 ° C ± 1.15 %V
O
Reg
line
Line Regulation Over V
I
range ± 5 mVReg
load
Load Regulation Over I
O
range ± 5 mV
ΔV
o
tot Total Output Voltage Includes set-point, line, load, – 40 ° C > T
A
> 85 ° C ± 1.5 ± 3 %V
OVariation
ΔV
ADJ
Output Adjust Range P
O
≤100 W – 20 10 %V
O
ηEfficiency I
O
= 50% I
O
max 92%V
R
V
O
Ripple (pk-pk) 20 MHz bandwidth 50 100 mV
pp
t
tr
0.1 A/ µs slew rate, 50% to 75% I
O
max 150 µsTransient ResponseΔV
tr
V
O
over/undershoot 33 mVI
TRIP
Overcurrent Threshold Shutdown, followed by auto-recovery 41 AOVP Output Overvoltage Output shutdown and latch off 120 %V
OProtectionOTP Over Temperature Temperature Measurement at thermal sensor. Hysteresis = 10 ° C 105 ° CProtection nominal.f
s
Switching Frequency Over V
I
range 300 kHzV
OFF
V
I
decreasing, I
O
= 6 A 32.5UVLO Undervoltage Lockout VV
HYS
Hysteresis 1.5On/Off Input: Negative Enable
V
IH
Input High Voltage 2.4 Open
(2)Referenced to – V
I
VV
IL
Input Low Voltage – 0.2 0.8I
IL
Input Low Current – 0.3 mAOn/Off Input: Positive Enable
V
IH
Input High Voltage 4.5 Open
(2)Referenced to – V
I
VV
IL
Input Low Voltage – 0.2 0.8I
IL
Input Low Current – 0.5 mAI
Isb
Standby Input Current Output disabled (pin 2 status set to Off) 42 mAC
I
External Input Capacitance Between +V
I
and – V
I
100 µFC
O
External Output Between +V
O
and – V
O
0 30000 µFCapacitance
Isolation Voltage Input-to-output and input-to-case 1500 VdcIsolation Capacitance Input-to-output 1200 pFIsolation Resistance Input-to-output 10 M Ω
(1) If Sense( – ) is not used, pin 5 must be connected to pin 4 for optimum output voltage accuracy.(2) The Remote On/Off input has an internal pull-up and may be controlled with an open collector (drain) interface. An open circuitcorrelates to a logic high. Consult the application notes for interface considerations.
4Submit Documentation Feedback Copyright © 2006 – 2009, Texas Instruments Incorporated
Product Folder Link(s): PTQA430025 PTQA430033 PTQA420050
ELECTRICAL CHARACTERISTICS PTQA420050
PTQA430025 , PTQA430033 , PTQA420050
www.ti.com
................................................................................................................................................... SLTS261C – MAY 2006 – REVISED SEPTEMBER 2009
(Unless otherwise stated, T
A
=25 ° C, V
I
= 48 V, V
O
= 5.0 V, C
O
= 0 µF, and I
O
= I
O
max)
PTQA420050PARAMETER TEST CONDITIONS
MIN TYP MAX UNIT
I
O
Output Current Over V
I
range 0 20 AV
I
Input Voltage Range Over I
O
Range 36 48 75 VV
O
tol Set Point Voltage ± 1
(1)
%V
OToleranceReg
temp
Temperature Variation – 40 ° C > T
A
> 85 ° C ± 1.15 %V
O
Reg
line
Line Regulation Over V
I
range ± 5 mVReg
load
Load Regulation Over I
O
range ± 5 mV
ΔV
o
tot Total Output Voltage Includes set-point, line, load, – 40 ° C > T
A
> 85 ° C ± 1.5 ± 3 %V
OVariation
ΔV
ADJ
Output Adjust Range P
O
≤100 W – 20 10 %V
O
ηEfficiency I
O
= 50% I
O
max 92.5%V
R
V
O
Ripple (pk-pk) 20 MHz bandwidth 50 100 mV
pp
t
tr
0.1 A/ µs slew rate, 50% to 75% I
O
max 100 µsTransient ResponseΔV
tr
V
O
over/undershoot 50 mVI
TRIP
Overcurrent Threshold Shutdown, followed by auto-recovery 29 AOVP Output Overvoltage Output shutdown and latch off 120 %V
OProtectionOTP Over Temperature Temperature Measurement at thermal sensor. Hysteresis = 10 ° C 105 ° CProtection nominal.f
s
Switching Frequency Over V
I
range 300 kHzV
OFF
V
I
decreasing, I
O
= 6 A 32.5UVLO Undervoltage Lockout VV
HYS
Hysteresis 1.5On/Off Input: Negative Enable
V
IH
Input High Voltage 2.4 Open
(2)Referenced to – V
I
VV
IL
Input Low Voltage – 0.2 0.8I
IL
Input Low Current – 0.3 mAOn/Off Input: Positive Enable
V
IH
Input High Voltage 4.5 Open
(2)Referenced to – V
I
VV
IL
Input Low Voltage – 0.2 0.8I
IL
Input Low Current – 0.5 mAI
Isb
Standby Input Current Output disabled (pin 2 status set to Off) 58 mAC
I
External Input Capacitance Between +V
I
and – V
I
100 µFC
O
External Output Between +V
O
and – V
O
0 30000 µFCapacitance
Isolation Voltage Input-to-output and input-to-case 1500 VdcIsolation Capacitance Input-to-output 1200 pFIsolation Resistance Input-to-output 10 M Ω
(1) If Sense( – ) is not used, pin 5 must be connected to pin 4 for optimum output voltage accuracy.(2) The Remote On/Off input has an internal pull-up and may be controlled with an open collector (drain) interface. An open circuitcorrelates to a logic high. Consult the application notes for interface considerations.
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PIN DESCRIPTIONS
Sense(+)
+VO
Adjust
Sense(−)
−VO
PTQA430xxxN
(Top V iew)
+VI
On/Off
1
2
3−VI5
6
7
4
8
PTQA430025 , PTQA430033 , PTQA420050
SLTS261C – MAY 2006 – REVISED SEPTEMBER 2009 ...................................................................................................................................................
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+V
I
:The positive input for the module with respect to – V
I
. When powering the module from a – 48-V telecomcentral office supply, this input is connected to the primary system ground.
– V
I
:The negative input supply for the module, and the 0 VDC reference for the Remote On/Off input. Whenpowering the module from a +48-V supply, this input is connected to the 48-V return.
Remote On/Off: This input controls the On/Off status of the output voltage. It is either driven low ( – V
I
potential),or left open-circuit. For units identified with the NEN option, applying a logic low to this pin will enable the output.And for units identified with the PEN option, the output will be disabled.
V
O
Adjust: Allows the output voltage to be trimmed by up or down between +10% and – 20% of its nominalvalue. The adjustment method uses a single external resistor. Connecting the resistor between V
O
Adjust and– V
O
adjusts the output voltage lower, and placing it between V
O
Adjust and +V
O
adjusts the output higher. Thecalculations for the resistance value follows industry standard formulas. For further information consult theapplication note on output voltage adustment.
+V
O
:The positive power output with respect to – V
O
, which is DC isolated from the input supply pins. If a negativeoutput voltage is desired, +V
O
should be connected to the secondary circuit common and the output taken from– V
O
.
– V
O
:The negative power output with respect to +V
O
, which is DC isolated from the input supply pins. This outputis normally connected to the secondary circuit common when a positive output voltage is desired.
Sense(+): Provides the converter with an output sense capability to regulate the set-point voltage directly at theload. When used with Sense(-), the regulation circuitry will compensate for voltage drop between the converterand the load. The pin may be left open circuit, but connecting it to +V
O
improves load regulation.
Sense( – ): Provides the converter with an output sense capability when used in conjunction with Sense(+) input.For optimum output voltage accuracy this pin should always be connected to – V
O
.
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TYPICAL CHARACTERISTICS
PTQA430025, V
O
= 2.5 V
(1) (2)
00 5 10 15 20 25 30
15
10
30
20
25
5
35
40
45
50
IO − Output Current − A
VO − Output Voltage Ripple − mVPP
VI= 36 V
VI= 48 V
VI= 60 V
VI= 75 V
0
0
5 10 15 20 25 30
6
4
12
8
10
2
P − PowerDissipation − W
D
I − OutputCurrent − A
O
VI=75V
VI=60V
VI=48V
VI=36V
90
80
85
95
70
60
65
75
50
40
45
55
0 5 10 15 20 25 30
I − OutputCurrent − A
O
VI=36V
VI=75V
η− Efficiency − %
VI=60V
VI=48V
20
0 5 10 15 20 25 30
50
40
80
60
70
30
90
LFM = 200
Natural
Convection
LFM = 400
LFM = 100
VI= 48 V
IO- Output Current - A
TA- Ambient Temperature - °C
PTQA430025 , PTQA430033 , PTQA420050
www.ti.com
................................................................................................................................................... SLTS261C – MAY 2006 – REVISED SEPTEMBER 2009
EFFICIENCY OUTPUT RIPPLE POWER DISSIPATIONvs vs vsLOAD CURRENT LOAD CURRENT LOAD CURRENT
Figure 1. Figure 2. Figure 3.
AMBIENT TEMPERATURE
vsLOAD CURRENT
Figure 4.
(1) All data listed in Figure 1 ,Figure 2 , and Figure 3 have been developed from actual products tested at 25 ° C. This data is consideredtypical data for the dc-dc converter.(2) The temperature derating curves represent operating conditions at which internal components are at or below manufacturer ' s maximumrated operating temperature. Derating limits apply to modules soldered directly to a 100 – mm × 100 – mm, double-sided PCB with 2 oz.copper. For surface mount packages, multiple vias (plated through holes) are required to add thermal paths around the power pins.Please refer to the mechanical specification for more information. Applies to Figure 4 .
Copyright © 2006 – 2009, Texas Instruments Incorporated Submit Documentation Feedback 7
Product Folder Link(s): PTQA430025 PTQA430033 PTQA420050
TYPICAL CHARACTERISTICS
PTQA430033, V
O
= 3.3 V
(1) (2)
0
0
5 10 15 20 25 30
6
4
12
8
10
2
14
IO– Output Current – A
PD– Power Dissipation – W
VI= 60 V
VI= 75 V
VI= 36 V
VI= 48 V
90
80
85
95
70
60
65
75
50
40
45
55
0 5 10 15 20 25 30
IO− OutputCurrent − A
V =36V
I
VI=48V VI=60V
VI=75V
η− Efficiency − %
00 5 10 15 20 25 30
15
10
30
20
25
5
35
40
IO − Output Current − A
VI= 36 V
VI= 48 V
VI= 60 V
VI= 75 V
VO − Output Voltage Ripple − mVPP
20 0 5 10 15 20 25 30
50
40
80
60
70
30
90
IO − Output Current − A
200 LFM
Natural
Convection
TA − Ambient Temperature − °C
400 LFM
100 LFM
VI = 48 V
PTQA430025 , PTQA430033 , PTQA420050
SLTS261C – MAY 2006 – REVISED SEPTEMBER 2009 ...................................................................................................................................................
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EFFICIENCY OUTPUT RIPPLE POWER DISSIPATIONvs vs vsLOAD CURRENT LOAD CURRENT LOAD CURRENT
Figure 5. Figure 6. Figure 7.
AMBIENT TEMPERATURE
vsLOAD CURRENT
Figure 8.
(1) All data listed in Figure 5 ,Figure 6 , and Figure 7 have been developed from actual products tested at 25 ° C. This data is consideredtypical data for the dc-dc converter.(2) The temperature derating curves represent operating conditions at which internal components are at or below manufacturer ' s maximumrated operating temperature. Derating limits apply to modules soldered directly to a 100 – mm × 100 – mm, double-sided PCB with 2 oz.copper. For surface mount packages, multiple vias (plated through holes) are required to add thermal paths around the power pins.Please refer to the mechanical specification for more information. Applies to Figure 8 .
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TYPICAL CHARACTERISTICS
PTQA420050, V
O
= 5.0 V
(1) (2)
0 5 10 15 20
VI36 V
48 V
60 V
75 V
90
80
85
95
70
60
65
75
IO − Output Current − A
VI = 36 V
η − Efficiency − %
VI = 48 V VI = 60 V
VI = 75 V
00
15
10
30
20
25
5
35
40
5 10 15 20
VI36 V
48 V
60 V
75 V
IO − Output Current − A
VO − Output Voltage Ripple − mVPP
VI = 36 V
VI = 48 V
VI = 60 V VI = 75 V
20 0
50
40
80
60
70
30
90
5 10 15 20
IO − Output Current − A
TA − Ambient T emperature − °C
VO = 5 V
VI = 48 V Natural Convection
400 LFM
100 LFM
200 LFM
PTQA430025 , PTQA430033 , PTQA420050
www.ti.com
................................................................................................................................................... SLTS261C – MAY 2006 – REVISED SEPTEMBER 2009
EFFICIENCY OUTPUT RIPPLE POWER DISSIPATIONvs vs vsLOAD CURRENT LOAD CURRENT LOAD CURRENT
Figure 9. Figure 10. Figure 11.
AMBIENT TEMPERATURE
vsLOAD CURRENT
Figure 12.
(1) All data listed in Figure 9 ,Figure 10 , and Figure 11 have been developed from actual products tested at 25 ° C. This data is consideredtypical data for the dc-dc converter.(2) The temperature derating curves represent operating conditions at which internal components are at or below manufacturer ' s maximumrated operating temperature. Derating limits apply to modules soldered directly to a 100 – mm × 100 – mm, double-sided PCB with 2 oz.copper. For surface mount packages, multiple vias (plated through holes) are required to add thermal paths around the power pins.Please refer to the mechanical specification for more information. Applies to Figure 12 .
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Product Folder Link(s): PTQA430025 PTQA430033 PTQA420050
APPLICATION INFORMATION
Operating Features and System Considerations for the PTQA Series of DC/DC Converters
Overcurrent Protection
Output Overvoltage Protection
Overtemperature Protection
Undervoltage Lockout
Primary-Secondary Isolation
Input Current Limiting
Thermal Considerations
PTQA430025 , PTQA430033 , PTQA420050
SLTS261C – MAY 2006 – REVISED SEPTEMBER 2009 ...................................................................................................................................................
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To protect against load faults, these converters incorporate output overcurrent protection. Applying a load to theoutput that exceeds the converter's overcurrent threshold (see applicable specification) will cause the outputvoltage to momentarily fold back, and then shut down. Following shutdown the module will periodically attempt toautomatically recover by initiating a soft-start power-up. This is often described as a hiccup mode of operation,whereby the module continues in the cycle of successive shutdown and power up until the load fault is removed.Once the fault is removed, the converter automatically recovers and returns to normal operation.
Each converter incorporates protection circuitry that continually senses for an output overvoltage (OV) condition.The OV threshold is set approximately 20% higher than the nominal output voltage. If the converter outputvoltage exceeds this threshold, the converter is immediately shut down and remains in a latched-off state. Toresume normal operation the converter must be actively reset. This can only be done by momentarily removingthe input power to the converter. For fail-safe operation and redundancy, the OV protection uses circuitry that isindependent of the converter ’ s internal feedback loop.
Overtemperature protection is provided by an internal temperature sensor, which closely monitors thetemperature of the converter ’ s printed circuit board (PCB). If the sensor exceeds a temperature of approximately105 ° C, the converter will shut down. The converter will then automatically restart when the sensed temperaturedrops back to approximately 95 ° C. When operated outside its recommended thermal derating envelope (seedata sheet SOA curves), the converter will typcially cycle on and off at intervals from a few seconds to one or twominutes. This is to ensure that the internal components are not permanently damaged from excessive thermalstress.
The Undervoltage lockout (UVLO) is designed to prevent the operation of the converter until the input voltage isat the minimum input voltage. This prevents high start-up current during normal power-up of the converter, andminimizes the current drain from the input source during low input voltage conditions. The UVLO circuitry alsooverrides the operation of the Remote On/Off control.
These converters incorporate electrical isolation between the input terminals (primary) and the output terminals(secondary). All converters are production tested to a withstand voltage of 1500 VDC. This specification complieswith UL60950 and EN60950 requirements. This allows the converter to be configured for either a positive ornegative input voltage source. The data sheet Pin Descriptions section provides guidance as to the correctreference that must be used for the external control signals.
The converter is not internally fused. For safety and overall system protection, the maximum input current to theconverter must be limited. Active or passive current limiting can be used. Passive current limiting can be a fastacting fuse. A 125-V fuse, rated no more than 10 A, is recommended. Active current limiting can be implementedwith a current limited Hot-Swap controller.
Airflow may be necessary to ensure that the module can supply the desired load current in environments withelevated ambient temperatures. The required airflow rate may be determined from the Safe Operating Area(SOA) thermal derating chart (see typical characteristics).
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Product Folder Link(s): PTQA430025 PTQA430033 PTQA420050
Differential Remote Sense
PTQA430025 , PTQA430033 , PTQA420050
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................................................................................................................................................... SLTS261C – MAY 2006 – REVISED SEPTEMBER 2009
The remote sense pins allows the converter to precisely regulate the DC output voltage at a remote location.This might be a power plane on an inner layer of the host PCB. Connecting Sense(+) directly to +V
O
, andSense( – ) to – V
O
will improve output voltage accuracy. In the event that the sense pins are left open-circuit, aninternal 10- Ωresistor between each sense pin and its corresponding output prevents an excessive rise in theoutput voltage. For practical reasons, the amount of IR voltage compensation should be limited to 0.5 Vmaximum.
The remote sense feature is designed to compensate for limited amounts of IR voltage drop. It is not intended tocompensate for the forward drop of a non-linear or frequency dependent components that may be placed inseries with the converter output. Examples of such components include OR-ing diodes, filter inductors, ferritebeads, and fuses. Enclosing these components with the remote sense connections effectively places them insidethe regulation control loop, which can affect the stability of the regulator.
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Using the Remote On/Off Function on the PTQA Series of DC/DC Converters
Negative Output Enable (NEN)
Positive Output Enable (PEN)
PTQA430025 , PTQA430033 , PTQA420050
SLTS261C – MAY 2006 – REVISED SEPTEMBER 2009 ...................................................................................................................................................
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For applications requiring output voltage On/Off control, the PTQA series of DC/DC converters incorporate aRemote On/Off control (pin 2). This feature can be used to switch the module off without removing the appliedinput source voltage. When placed in the Off state, the standby current drawn from the input source is typicallyreduced to 3 mA.
Models using the negative enable option, the Remote On/Off (pin 2) control must be driven to a logic low voltagefor the converter to produce an output. This is accomplished by either permanently connecting pin 2 to – V
I
(pin3), or driving it low with an external control signal. Table 1 shows the input requirements of pin 2 for thosemodules with the NEN option.
Table 1. On/Off Control Requirementsfor Negative Enable
PARAMETER MIN TYP MAX
V
IH
Disable 2.4 V 20 VV
IL
Enable – 0.2 V 0.8 VV
o/c
Open-Circuit 9 V 15 VI
I
Pin 2 at – V
I
– 0.75 mA
For those models with the positive enable (PEN) option, leaving pin 2 open circuit, (or driving it to an equivalentlogic high voltage), will enable the converter output. This allows the module to produce an output voltagewhenever a valid input source voltage is applied to +V
I
with respect to – V
I
. If a logic-low signal is then applied topin 2 the converter output is disabled. Table 2 gives the input requirements of pin 2 for modules with the PENoption.
Table 2. On/Off Control Requirementsfor Positive Enable
PARAMETER MIN TYP MAXV
IH
Enable 4.5 V 20 VV
IL
Disable – 0.2 V 0.8 VV
o/c
Open-Circuit 5 V 7 VI
I
Pin 2 at – V
I
– 0.5 mA
Notes:
1. The Remote On/Off control uses – V
I
(pin 3) as its ground reference. All voltages are with respect to – V
I
.2. An open-collector device (preferably a discrete transistor) is recommended. A pull-up resistor is not required.If one is added the pull-up voltage should not exceed 20 V.
Caution: Do not use a pull-resistor to +V
I
(pin 1). The remote On/Off control has a maximum input voltage of20 V. Exceeding this voltage will overstress, and possibly damage, the converter.3. The Remote On/Off pin may be controlled with devices that have a totem-pole output. This is provided theoutput high level voltage (V
OH
) meets the module's minimum V
IH
specified in Table 1 . If a TTL gate is used, apull-up resistor may be required to the logic supply voltage.4. The converter incorporates an undervoltage lockout (UVLO). The UVLO keeps the converter off until theinput voltage is close to the minimum specified operating voltage. This is regardless of the state of theRemote On/Off control. Consult the product specification for the UVLO input voltage thresholds.
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Product Folder Link(s): PTQA430025 PTQA430033 PTQA420050
PTQA430xxxP
1 = Disable
−VI
Q1
BSS138
2
3−VI
Remote
On/Off
t − Time − 100 µs/div
Voltage
Undershoot
VO (1 V/div)
< 300 mV
Delay Time
VO (1 V/div)
II (1 A/div)
Q1 VGS (10 V/div)
t − Time − 5 ms/div
PTQA430025 , PTQA430033 , PTQA420050
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................................................................................................................................................... SLTS261C – MAY 2006 – REVISED SEPTEMBER 2009
Figure 13. Recommended Control or Remote On/Off Input
Turn-On: With a valid input source voltage applied, the converter produces a regulated output voltage within 75ms of the output being enabled. Figure 14 shows the output response of the PTQA430033P following theremoval of the logic-low signal from the Remote On/Off (pin 2); see Figure 13 . This corresponds to the drop inQ1 V
GS
in Figure 14 . Although the rise-time of the output voltage is short ( < 10 ms), the indicated delay time willvary depending upon the input voltage and the module ’ s internal timing. The waveforms were measured with 48VDC input voltage, and a 10-A resistive load.
Turn-Off Time: When a valid input source is removed or if the Remote On/Off (pin 2) is used to disable theoutput, with no external output capacitance, the module powers down within 200 µs. Figure 15 shows that, duringpower down, there is a small undershoot, typically less than 300 mV (or less than a diode drop). If used to supplyprocessor I/O voltages, the low undershoot ensures the parasitic diodes do not conduct current and potentiallycause damage to external circuitry.
Figure 14. Power Up Figure 15. Power Down
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Adjusting the Output Voltage of the 100-W Rated PTQA Series of Isolated DC/DC Converters
R1 +5.11 VO(100 )D%)
1.225 D%*511
D%*10.22 (kW)
(1)
(R2) +5.11100
D%*10.22 (kW)
(2)
IO(max) +VO IO(rated)
VA
(3)
L
O
A
D
Sense (–)
Sense (+)
+
(R2)
Adjust
Down
PTQA430xxxN
Sense(+)
Sense(–)
52
7
Adjust
8
6
4
1
3
+VI
−VI
+VI
−VI
CO
330 µF
+VO
−VO
+VO
−VO
Remote
On/Off
R1
Adjust
Up
PTQA430025 , PTQA430033 , PTQA420050
SLTS261C – MAY 2006 – REVISED SEPTEMBER 2009 ...................................................................................................................................................
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The output voltage adjustment of the PTQA series of isolated DC/DC converters follows the standard adopted bypopular 1/4-brick DC/DC converters. Adjustment is accomplished with a single external resistor that can adjustthe output voltage from – 20% to +10% of the nominal set-point voltage. The placement of the resistor determinesthe direction of adjustment, up or down, and the value of the magnitude of adjustment.
Adjust Up: To increase the output voltage add a resistor, R1, between V
O
Adjust (pin 6) and Sense(+) (pin 7).
Adjust Down: Add a resistor, (R2), between V
O
Adjust (pin 6) and Sense( – ) (pin 5).
Refer to Figure 16 for the placement of the required resistor, R1 or (R2).
The values of R1 [adjust up], and (R2) [adjust down], can be calculated using the following formulas or selectedfrom Table 3 .
Where:
Δ% = Amount of adjustment in %V
O
= Original set-point voltage
Notes:
1. Use only a single 1% resistor in either the R1 or (R2) location. Place the resistor as close to the converter aspossible.
2. If the output voltage is increased, the maximum load current must be derated according to the followingequation.
Where:
V
O
= Original set-point voltageV
A
= Adjusted output voltage (measured between pins 8 and 4)
In any instance, the load current must not exceed the converter's maximum rated output current of 30 A.3. The overvoltage threshold is fixed, and is set approximately 20% above the nominal output voltage. Adjustingthe output voltage higher reduces the voltage margin between the adjusted output voltage and theovervoltage (OV) protection threshold. This could make the module sensitive to OV fault detection, as aresult of random noise and load transients.
Figure 16.
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................................................................................................................................................... SLTS261C – MAY 2006 – REVISED SEPTEMBER 2009
Table 3. Standard Adjustment Resistor Values
Adjusted Output Voltage (V) Trim-Up R
ADJ
Trim-Down R
ADJ
V
O
(nom) 5.0 V 3.3 V 2.5 V 5.0 V 3.3 V 2.5 V% Adjust (V) 5.0 V 3.3 V 2.5 V R1 (k Ω) R1 (k Ω) R1 (k Ω) R2 (k Ω) R2 (k Ω) R2 (k Ω)
+10 5.50 3.630 2.750 169 90.9 53.6 - - -+ 9 5.45 3.597 2.725 187 100 59.0 - - -+ 8 5.40 3.564 2.700 205 113 66.5 - - -+ 7 5.35 3.531 2.675 237 127 76.8 - - -+ 6 5.30 3.498 2.650 274 147 88.7 - - -+ 5 5.25 3.465 2.625 324 178 107 - - -+ 4 5.20 3.432 2.600 402 221 133 - - -+ 3 5.15 3.399 2.575 536 294 178 - - -+ 2 5.10 3.366 2.550 787 432 267 - - -+ 1 5.05 3.333 2.525 1580 866 536 - - -0 5.00 3.300 2.500 Open Open Open - - -– 1 4.95 3.267 2.475 - - - 499 499 499– 2 4.90 3.234 2.450 - - - 243 243 243– 3 4.85 3.201 2.425 - - - 158 158 158– 4 4.80 3.168 2.400 - - - 118 118 118– 5 4.75 3.135 2.375 - - - 90.9 90.9 90.9– 6 4.70 3.102 2.350 - - - 75 75 75– 7 4.65 3.069 2.325 - - - 63.4 63.4 63.4– 8 4.60 3.036 2.300 - - - 53.6 53.6 53.6– 9 4.55 3.003 2.275 - - - 46.4 46.4 46.4– 10 4.50 2.970 2.250 - - - 41.2 41.2 41.2– 11 4.45 2.937 2.225 - - - 36.5 36.5 36.5– 12 4.40 2.904 2.200 - - - 32.4 32.4 32.4– 13 4.35 2.871 2.175 - - - 28.7 28.7 28.7– 14 4.30 2.838 2.150 - - - 26.1 26.1 26.1– 15 4.25 2.805 2.125 - - - 23.7 23.7 23.7– 16 4.20 2.772 2.100 - - - 21.5 21.5 21.5– 17 4.15 2.739 2.075 - - - 19.6 19.6 19.6– 18 4.10 2.706 2.050 - - - 18.2 18.2 18.2– 19 4.05 2.673 2.025 - - - 16.5 16.5 16.5– 20 4.00 2.640 2.000 - - - 15.4 15.4 15.4
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PACKAGE OPTION ADDENDUM
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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)
PTQA420050N2AD ACTIVE Through-
Hole Module EAP 8 9 Pb-Free (RoHS) SN N / A for Pkg Type Request Free Samples
PTQA420050N2AS ACTIVE Surface
Mount Module EAQ 8 9 TBD SNPB Level-1-235C-UNLIM/
Level-3-260C-168HRS Request Free Samples
PTQA420050N2AZ ACTIVE Surface
Mount Module BAQ 8 9 Pb-Free (RoHS) SNAGCU Level-3-260C-168 HR Request Free Samples
PTQA420050P2AD ACTIVE Through-
Hole Module EAP 8 9 Pb-Free (RoHS) SN N / A for Pkg Type Request Free Samples
PTQA420050P2AS ACTIVE Surface
Mount Module EAQ 8 9 TBD SNPB Level-1-235C-UNLIM/
Level-3-260C-168HRS Request Free Samples
PTQA420050P2AZ ACTIVE Surface
Mount Module BAQ 8 9 Pb-Free (RoHS) SNAGCU Level-3-260C-168 HR Request Free Samples
PTQA430025N2AD ACTIVE Through-
Hole Module EAP 8 9 Pb-Free (RoHS) SN N / A for Pkg Type Request Free Samples
PTQA430025N2AS ACTIVE Surface
Mount Module EAQ 8 9 TBD SNPB Level-1-235C-UNLIM/
Level-3-260C-168HRS Purchase Samples
PTQA430025N2AZ ACTIVE Surface
Mount Module BAQ 8 9 Pb-Free (RoHS) SNAGCU Level-3-260C-168 HR Purchase Samples
PTQA430025P2AD ACTIVE Through-
Hole Module EAP 8 9 Pb-Free (RoHS) SN N / A for Pkg Type Request Free Samples
PTQA430025P2AS ACTIVE Surface
Mount Module EAQ 8 9 TBD SNPB Level-1-235C-UNLIM/
Level-3-260C-168HRS Purchase Samples
PTQA430025P2AZ ACTIVE Surface
Mount Module BAQ 8 9 Pb-Free (RoHS) SNAGCU Level-3-260C-168 HR Purchase Samples
PTQA430033N2AD ACTIVE Through-
Hole Module EAP 8 9 Pb-Free (RoHS) SN N / A for Pkg Type Request Free Samples
PTQA430033N2AS ACTIVE Surface
Mount Module EAQ 8 9 TBD SNPB Level-1-235C-UNLIM/
Level-3-260C-168HRS Purchase Samples
PTQA430033N2AZ ACTIVE Surface
Mount Module BAQ 8 9 Pb-Free (RoHS) SNAGCU Level-3-260C-168 HR Purchase Samples
PTQA430033P2AD ACTIVE Through-
Hole Module EAP 8 9 Pb-Free (RoHS) SN N / A for Pkg Type Request Free Samples
PTQA430033P2AS ACTIVE Surface
Mount Module EAQ 8 9 TBD SNPB Level-1-235C-UNLIM/
Level-3-260C-168HRS Purchase Samples
PACKAGE OPTION ADDENDUM
www.ti.com 13-Nov-2010
Addendum-Page 2
Orderable Device Status (1) Package Type Package
Drawing Pins Package Qty Eco Plan (2) Lead/
Ball Finish MSL Peak Temp (3) Samples
(Requires Login)
PTQA430033P2AZ ACTIVE Surface
Mount Module BAQ 8 9 Pb-Free (RoHS) SNAGCU Level-3-260C-168 HR Purchase Samples
(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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