28VIN, 3.3 to 15VOUT, ZVS Isolated Converter Module Family
28 Volt
M-Grade
PI31xx-00-HVMZ
28 Volt M-Grade Rev 1.8
Page 1 of 26 09/2018
Product Description
The ZVS Isolated Converter Module Series consists of high‑density
isolated DC‑DC converters implementing Zero‑Voltage
Switching topology.
The 28VIN series operates over a wide range input of 16V to 50VDC,
delivering 50W of output power, yielding an unprecedented power
density of 334W/in3.
These converter modules are surface mountable and only
~0.5in square in area achieving ~50% space reduction versus
conventional solutions.
The switching frequency of 900kHz allows for small input and
output filter components which further reduces the total size and
cost of the overall system solution. The output voltage is sensed
and fed back to the internal controller using a high performance
isolated magnetic feedback scheme which allows for high
bandwidth and good common mode noise immunity.
The PI31xx‑00‑HVMZ series requires no external feedback
compensation and offers a total solution with a minimum number
of external components. A rich feature set is offered, including
output voltage trim capability, output overvoltage protection,
adjustable soft start, overcurrent protection with auto‑restart, over
and under input voltage lockout and a temperature monitoring and
protection function that provides an analog voltage proportional to
the die temperature as well as shut down and alarm capabilities.
Features & Benefits
• Efficiency up to 88%
• High switching frequency minimizes input filter
requirements and reduces output capacitance
• Proprietary “Double-Clamped” ZVS Buck-Boost Topology
• Proprietary isolated magnetic feedback
• Small footprint (0.57in2) enables PCB area savings
• Very low profile (0.265in)
• Wide input voltage range operation (16 – 50VDC)
• On/Off Control, positive logic
• Wide trim range +10/–20% most models
• Temperature Monitor (TM) &
Overtemperature Protection (OTP)
• Input UVLO & OVLO and output OVP
• Overcurrent protection with auto restart
• Adjustable soft start
• 2250VDC input-to-output isolation
Applications
• Wide Temperature, Aerospace & Defense Applications
• Space-Constrained Systems
• Isolated Board-Level Power
Package Information
• Surface Mountable 0.87 x 0.65 x 0.265in package
• Weight = 7.8 grams
Device Output Voltage IOUT Max
Set Range
PI3108-00-HVMZ 3.3V 2.97 – 3.63V 10A
PI3109-00-HVMZ 5V 4 – 5.5V 10A
PI3106-00-HVMZ 12V 9.6 – 13.2V 4.2A
PI3111-00 -HVMZ 15V 12 – 16.5V 3.33A
28 Volt M-Grade Rev 1.8
Page 2 of 26 09/2018
PI31xx-00-HVMZ
Contents
Order Information 3
Absolute Maximum Ratings 4
Functional Block Diagram 5
Pin Description 6
Package Pinout 6
PI3108‑00‑HVMZ Electrical Characteristics 7
PI3109‑00‑HVMZ Electrical Characteristics 11
PI3106‑00‑HVMZ Electrical Characteristics 15
PI3111‑00‑HVMZ Electrical Characteristics 19
Functional Description 23
Input Power Pins IN(+) and IN(–) 23
ENABLE 23
TRIM/SS Pin 23
TM 24
SGND 24
Output Power Pins +OUT and –OUT 24
Package Outline & Recommended PCB Land Pattern 25
Product Warranty 26
28 Volt M-Grade Rev 1.8
Page 3 of 26 09/2018
PI31xx-00-HVMZ
Order Information
Part Number VIN VOUT IOUT Max Package Transport
Media
PI3108‑00‑HVMZ 16 – 50V 3.3V 10A 0.87 x 0.65 x 0.265in TRAY
PI3109‑00‑HVMZ 16 – 50V 5V 10A 0.87 x 0.65 x 0.265in TRAY
PI3106‑00‑HVMZ 16 – 50V 12V 4.2A 0.87 x 0.65 x 0.265in TRAY
PI3111‑00‑HVMZ 16 – 50V 15V 3.33A 0.87 x 0.65 x 0.265in TRAY
Also Available
PI3101‑00‑HVIZ 36 – 75V 3.3V 18A 0.87 x 0.65 x 0.265in TRAY
PI3105‑00‑HVIZ 36 – 75V 12V 5A 0.87 x 0.65 x 0.265in TRAY
PI3110‑01‑HVIZ 41 – 57V 18V 3.3A 0.87 x 0.65 x 0.265in TRAY
PI3109‑01‑HVIZ 18 – 36V 5V 10A 0.87 x 0.65 x 0.265in TRAY
PI3106‑01‑HVIZ 18 – 36V 12V 4.2A 0.87 x 0.65 x 0.265in TRAY
28 Volt M-Grade Rev 1.8
Page 4 of 26 09/2018
PI31xx-00-HVMZ
Absolute Maximum Ratings
Name Rating
+IN to –IN Max Operating Voltage –1.0 to 50VDC (operating)
+IN to –IN Max Peak Voltage 55VDC (non‑operating, 12.5ms)
ENABLE to –IN –0.3 to 6.0VDC
TM to –IN –0.3 to 6.0VDC
TRIM/SS to –IN –0.3 to 6.0VDC
+OUT to –OUT See relevant model output section
Isolation Voltage (+IN/–IN to +OUT/–OUT) 2250VDC
Continuous Output Current See relevant model output section
Peak Output Current See relevant model output section
Operating Junction Temperature –55 to 125°C
Storage Temperature –65 to 125°C
Case Temperature During Reflow 245°C
Peak Compressive Force Applied to Case (Z‑axis) 3lbs (supported by J‑lead only)
28 Volt M-Grade Rev 1.8
Page 5 of 26 09/2018
PI31xx-00-HVMZ
Functional Block Diagram
TRIM/SS
+OUT
SGND
-OUT
-IN
+IN
ENABLE
TM
LFF
-
+
RSS
CSS INT
VREF
1.22V
RFB1
CFB1
CFB2
-
+Error Amp
Driver
-
+
DC
Slow Current Limit
Driver
Synchronous
Rectifier
-
+
DC
Output OVP
-
+
DC
Input UVP
Input OVP
-
+
DC
-
+
DC
Fast Current Limit
Over Temp
-
+
DC
ENB
Period Ramp
-
+
DC
Enable
-
+
DC
On-Duty Ramp
-
+
ZVS POWER
TRAIN
+
-
DC
Timing
Logic
FB
FB
ENB
+5V
EA Fault
-
+
DC
120µs
delay
120µs
delay
Fault
Latch
And
Reset
Logic
Reset
Fault
RUN
BIAS
START
BIAS
Vcc
Temp
Sensor
ZVS POWER
TRAIN
ZVS
FB
28 Volt M-Grade Rev 1.8
Page 6 of 26 09/2018
PI31xx-00-HVMZ
U.S. PATS. LISTED ON PACKING MATERIALS & DATASHEETS
MADE
IN
USA
DC-DC
Converter
+IN
-IN
+OUT
-OUT
SGND
TM
TRIM/SS
ENABLE
Package Pinout
Pin Description
Pin Name Description
+IN Primary side positive input voltage terminals.
–IN Primary side negative input voltage terminals.
ENABLE Converter enable option, functions as 5V reference and on / off control pin. Pull low for off.
TRIM/SS External soft‑start pin and trim function. Connect to SGND or ENABLE through resistor for trim up or trim down.
TM Temperature measurement output pin.
SGND Signal ground, primary side referenced.
+OUT Isolated secondary DC output voltage positive terminals.
–OUT Isolated secondary DC output voltage negative terminals.
28 Volt M-Grade Rev 1.8
Page 7 of 26 09/2018
PI31xx-00-HVMZ
PI3108-00-HVMZ Electrical Characteristics
Unless otherwise specified: 16V < VIN < 50V, 0A < IOUT < 10A, –55°C < TCASE < 100°C [a]
Parameter Symbol Conditions Min Typ Max Unit
Input Specifications
Input Voltage Range VIN 16 28 50 VDC
Input dV/dt [a] VINDVDT VIN = 50V 1.0 V/µs
Input Undervoltage Turn‑on VUVON IO = 10A 14.5 15.3 16 VDC
Input Undervoltage Turn‑off VUVOFF IO = 10A 13.5 14.1 15.2 VDC
Input Undervoltage Hysteresis VUVH IO = 10A 1.2 VDC
Input Overvoltage Turn‑on VOVON IO = 10A 50 52.5 54 VDC
Input Overvoltage Turn‑off VOVOFF IO = 10A 51 53.7 55 VDC
Input Overvoltage Hysteresis VOVH IO = 10A 1.2 VDC
Input Quiescent Current IQVIN = 28V, ENABLE = 0V 2 mADC
Input Idling Power PIDLE VIN = 28V, IOUT = 0A 2.6 W
Input Standby Power PSBY VIN = 28V, ENABLE = 0V 0.048 W
Input Current Full Load IIN
TCASE = 100°C, IOUT = 10A, ηFL = 86% typical,
VIN = 28V 1.37 ADC
Input Reflected Ripple Current IINRR
LIN = 0.47µH CIN = 100µF 63V electrolytic + 2 x 4.7µF
50V X7R ceramic 15 mApp
Recommended Ext Input Capacitance CIN
CIN = 100µF 63V electrolytic + 2 x 4.7µF 50V X7R
ceramic CIN = Cbulk + Chf 109.4 µF
Output Specifications
Output Voltage Set Point VOUT IOUT = 5A 3.3 VDC
Total Output Accuracy VOA
–0ºC < TCASE < 100ºC –3 +3 %
–55ºC < TCASE < 0ºC –5 +3 %
Output Voltage Trim Range VOADJ –10 10 %
Output Current Range IOUT 10 ADC
Overcurrent Protection IOCP 11.0 15 20 ADC
Efficiency – Full Load ηFL TCASE = 100ºC, VIN = 28V 84 86 %
Efficiency – Half Load ηHL TCASE = 100ºC, VIN = 28V 80 82 %
Output OVP Set Point VOVP 3.9 4.1 4.3 VDC
Output Ripple Voltage VORPP COUT = 6 x 10µF 10V X7R DC‑20MHz 90 mVpp
Switching Frequency fSW 900 kHz
Output Turn‑on Delay Time tONDLY VIN = VUVON to ENABLE = 5V; VIN rise time < 1ms 80 ms
Output Turn‑off Delay Time tOFFDLY VIN = VUVOFF to ENABLE < 2.35V 375 µs
Soft‑Start Ramp Time tSS ENABLE = 5V to 90% VOUT CREF = 0 380 µs
Maximum Load Capacitance COUT CREF = 0.22µF, COUT = Al Electrolytic 4700 µF
Load Transient Deviation VODV
IOUT = 50% step 0.1A/µS
COUT = 6 x 10µF 10V X7R 145 mV
Load Transient Recovery Time tOVR
IOUT = 50% step 0.1A/µS
COUT = 6 x 10µF 10V X7R
VOUT ≤ 1%
100 µs
Maximum Output Power POUT 33 W
Absolute Maximum Output Ratings
Name Rating
+OUT to –OUT –0.5V to 6.8VDC
Continuous Output Current 10ADC
Peak Output Current 20ADC
[a] These parameters are not production tested but are guaranteed by design, characterization and correlation with statistical process control.
Unless otherwise specified, ATE tests are completed at room temperature.
[b] Current flow sourced by a pin has a negative sign.
28 Volt M-Grade Rev 1.8
Page 8 of 26 09/2018
PI31xx-00-HVMZ
PI3108-00-HVMZ Electrical Characteristics (Cont.)
Parameter Symbol Conditions Min Typ Max Unit
ENABLE
DC Voltage Reference Output VERO 4.65 4.9 5.15 VDC
Output Current Limit [b] IECL ENABLE = 3.3V –3.3 –2.6 –1.9 mADC
Start Up Current Limit [b] IESL ENABLE = 1V –120 –90 –60 µA
Module Enable Voltage VEME 1.95 2.5 3.05 VDC
Module Disable Voltage VEMD 1.8 2.35 2.9 VDC
Disable Hysteresis VEDH 150 mV
Enable Delay Time tEE 10 µs
Disable Delay Time tED 10 µs
Maximum Capacitance CEC 1500 pF
Maximum External Toggle Rate fEXT 1 Hz
TRIM/SS
Trim Voltage Reference VREF 1.240 VDC
Internal Capacitance CREFI 10 nF
External Capacitance CREF 0.22 µF
Internal Resistance RREFI 10 kΩ
TM (Temperature Monitor)
Temperature Coefficient [a] TMTC 10 mV / ºK
Temperature Full Range Accuracy [a] TMACC –5 5 ºK
Drive Capability ITM –100 µA
TM Output Setting VTM Ambient Temperature = 300ºK 3.00 V
Thermal Specification
Junction Temperature Shutdown [a] TMAX 130 135 140 ºC
Junction‑to‑Case Thermal Impedance θJ‑C 3 ºC / W
Case‑to‑Ambient Thermal Impedance θC‑A Mounted on 9in2 1oz. Cu 6 layer PCB 25°C 9.6 ºC / W
Soldering
Peak Temperature During Reflow MSL 5; time on floor = 48 hours 225 ºC
MSL 6; time on floor = 4 hours 245 ºC
Regulatory Specification
IEC 60950‑1:2005 (2nd Edition)
EN 60950‑1:2006
IEC 61000‑4‑2
UL60950‑1:2007
CAN/CSA C22.2 NO. 60950‑1‑07
Recommended Input Fuse Rating IFUSE Fast acting LITTLEFUSE Nano2 Series Fuse 4 10 A
[a] These parameters are not production tested but are guaranteed by design, characterization and correlation with statistical process control.
Unless otherwise specified, ATE tests are completed at room temperature.
[b] Current flow sourced by a pin has a negative sign.
28 Volt M-Grade Rev 1.8
Page 9 of 26 09/2018
PI31xx-00-HVMZ
Load Curent (Amps)
Efficiency
50
55
60
65
70
75
80
85
90
1 2 3 4 5 6 7 8 9 10
VIN = 16V@100°C
VIN = 28V@100°C
VIN = 50V@100°C
Figure 1 — Conversion efficiency
Temp °C
Load Currrent (Amps)
16V 0 LFM
28V 0 LFM
50V 0 LFM
16V 200 LFM
28V 200 LFM
50V 200 LFM
16V 600 LFM
28V 600 LFM
50V 600LFM
0
1
2
3
4
5
6
7
8
9
10
25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110
Figure 2 — Load current vs. temperature (without heat sink)
Temp °C
Load Currrent (Amps)
16V 0 LFM
28V 0 LFM
50V 0 LFM
16V 200 LFM
28V 200 LFM
50V 200 LFM
16V 600 LFM
28V 600 LFM
50V 600LFM
0
1
2
3
4
5
6
7
8
9
10
25 30 35 40 45 50 55 60 65 70 75 80 85 90 95
100 105 110 115
Figure 4 — Load current vs. temperature (11mm heat sink)
Temp °C
Load Currrent (Amps)
16V 0 LFM
28V 0 LFM
50V 0 LFM
16V 200 LFM
28V 200 LFM
50V 200 LFM
16V 600 LFM
28V 600 LFM
50V 600LFM
0
1
2
3
4
5
6
7
8
9
10
25 30 35 40 45 50 55 60 65 70 75 80 85 90 95
100 105 110 115
Figure 3 — Load current vs. temperature (6.33mm heat sink)
PI3108-00-HVMZ Electrical Characteristics (Cont.)
Figure 6 — Start up, CREF = 0 (VIN = 28V, IOUT = 10A, CR,
COUT = 6 x 10µF X7R ceramic)
Figure 5 — Start up, CREF = 0 (VIN = 16V, IOUT = 10A, CR,
COUT = 6 x 10µF X7R ceramic)
28 Volt M-Grade Rev 1.8
Page 10 of 26 09/2018
PI31xx-00-HVMZ
Figure 7 — Start up, CREF = 0 (VIN = 50V, IOUT = 10A, CR,
COUT = 6 x 10µF X7R ceramic)
Figure 8 — Transient response (VIN = 28V, IOUT = 5 – 10A, 0.1A/µs,
COUT = 6 x 10µF X7R ceramic)
Figure 9 — Output ripple (VIN = 28V, IOUT = 10A, CR,
COUT = 6 x 10µF X7R ceramic)
PI3108-00-HVMZ Electrical Characteristics (Cont.)
Figure 10 — Thermal image
(VIN = 28V, IOUT = 10A, CR, 0LFM evaluation PCB)
28 Volt M-Grade Rev 1.8
Page 11 of 26 09/2018
PI31xx-00-HVMZ
PI3109-00-HVMZ Electrical Characteristics
Unless otherwise specified: 16V < VIN < 50V, 0A < IOUT < 10A, –55°C < TCASE < 100°C [a]
Parameter Symbol Conditions Min Typ Max Unit
Input Specifications
Input Voltage Range VIN 16 28 50 VDC
Input dV/dt [a] VINDVDT VIN = 50V 1.0 V/µs
Input Undervoltage Turn‑on VUVON IO = 10A 14.5 15.3 16 VDC
Input Undervoltage Turn‑off VUVOFF IO = 10A 13.5 14.1 15.2 VDC
Input Undervoltage Hysteresis VUVH IO = 10A 1.2 VDC
Input Overvoltage Turn‑on VOVON IO = 10A 50.0 52.5 54 VDC
Input Overvoltage Turn‑off VOVOFF IO = 10A 51 53.7 55 VDC
Input Overvoltage Hysteresis VOVH IO = 10A 1.2 VDC
Input Quiescent Current IQVIN = 28V, ENABLE = 0V 2 mADC
Input Idling Power PIDLE VIN = 28V, IOUT = 0A 3.5 W
Input Standby Power PSBY VIN = 28V, ENABLE = 0V 0.056 W
Input Current Full Load IIN
TCASE = 100°C, IOUT = 10A, ηFL = 88% typical,
VIN = 28V 2.03 ADC
Input Reflected Ripple Current IINRR
LIN = 0.47µH CIN = 100µF 63V electrolytic + 2 x 4.7µF
50V X7R ceramic 13 mApp
Recommended Ext Input Capacitance CIN
CIN = 100µF 63V electrolytic + 2 x 4.7µF 50V X7R
ceramic CIN = Cbulk + Chf 109.4 µF
Output Specifications
Output Voltage Set Point VOUT IOUT = 5A 5.0 VDC
Total Output Accuracy VOA
–0ºC < TCASE < 100ºC –3 +3 %
–55ºC < TCASE < 0ºC –5 +3 %
Output Voltage Trim Range VOADJ –20 10 %
Output Current Range IOUT 10 ADC
Overcurrent Protection IOCP 10.8 15 20 ADC
Efficiency – Full Load ηFL TCASE = 100ºC, VIN = 28V 86 88 %
Efficiency – Half Load ηHL TCASE = 100ºC, VIN = 28V 83.5 85.5 %
Output OVP Set Point VOVP 6.0 6.3 6.6 VDC
Output Ripple Voltage VORPP COUT = 6 x 10µF 10V X7R DC‑20MHz 135 mVpp
Switching Frequency fSW 900 kHz
Output Turn‑on Delay Time tONDLY VIN = VUVON to ENABLE = 5V; VIN rise time < 1ms 80 ms
Output Turn‑off Delay Time tOFFDLY VIN = VUVOFF to ENABLE < 2.35V 375 µs
Soft‑Start Ramp Time tSS ENABLE = 5V to 90% VOUT CREF = 0 230 µs
Maximum Load Capacitance COUT CREF = 0.22µF, COUT = Al Electrolytic 4700 µF
Load Transient Deviation VODV
IOUT = 50% step 0.1A/µS
COUT = 6 x 10µF 10V X7R 90 mV
Load Transient Recovery Time tOVR
IOUT = 50% step 0.1A/µS
COUT = 6 x 10µF 10V X7R
VOUT ≤ 1%
100 µs
Maximum Output Power POUT 50 W
Absolute Maximum Output Ratings
Name Rating
+OUT to –OUT –0.5V to 6.8VDC
Continuous Output Current 10ADC
Peak Output Current 20ADC
[a] These parameters are not production tested but are guaranteed by design, characterization and correlation with statistical process control.
Unless otherwise specified, ATE tests are completed at room temperature.
[b] Current flow sourced by a pin has a negative sign.
28 Volt M-Grade Rev 1.8
Page 12 of 26 09/2018
PI31xx-00-HVMZ
PI3109-00-HVMZ Electrical Characteristics (Cont.)
Parameter Symbol Conditions Min Typ Max Unit
ENABLE
DC Voltage Reference Output VERO 4.65 4.9 5.15 VDC
Output Current Limit [b] IECL ENABLE = 3.3V –3.3 –2.6 –1.9 mADC
Start Up Current Limit [b] IESL ENABLE = 1V –120 –90 –60 µA
Module Enable Voltage VEME 1.95 2.5 3.05 VDC
Module Disable Voltage VEMD 1.8 2.35 2.9 VDC
Disable Hysteresis VEDH 150 mV
Enable Delay Time tEE 10 µs
Disable Delay Time tED 10 µs
Maximum Capacitance CEC 1500 pF
Maximum External Toggle Rate fEXT 1 Hz
TRIM/SS
Trim Voltage Reference VREF 1.240 VDC
Internal Capacitance CREFI 10 nF
External Capacitance CREF 0.22 µF
Internal Resistance RREFI 10 kΩ
TM (Temperature Monitor)
Temperature Coefficient [a] TMTC 10 mV / ºK
Temperature Full Range Accuracy [a] TMACC –5 5 ºK
Drive Capability ITM –100 µA
TM Output Setting VTM Ambient Temperature = 300ºK 3.00 V
Thermal Specification
Junction Temperature Shutdown [a] TMAX 130 135 140 ºC
Junction‑to‑Case Thermal Impedance θJ‑C 3 ºC / W
Case‑to‑Ambient Thermal Impedance θC‑A Mounted on 9in2 1oz. Cu 6 layer PCB 25°C 9.1 ºC / W
Soldering
Peak Temperature During Reflow MSL 5; time on floor = 48 hours 225 ºC
MSL 6; time on floor = 4 hours 245 ºC
Regulatory Specification
IEC 60950‑1:2005 (2nd Edition)
EN 60950‑1:2006
IEC 61000‑4‑2
UL60950‑1:2007
CAN/CSA C22.2 NO. 60950‑1‑07
Recommended Input Fuse Rating IFUSE Fast acting LITTLEFUSE Nano2 Series Fuse 4 10 A
[a] These parameters are not production tested but are guaranteed by design, characterization and correlation with statistical process control.
Unless otherwise specified, ATE tests are completed at room temperature.
[b] Current flow sourced by a pin has a negative sign.
28 Volt M-Grade Rev 1.8
Page 13 of 26 09/2018
PI31xx-00-HVMZ
Load Curent (Amps)
Efficiency
50
55
60
65
70
75
80
85
90
1 2 3 4 5 6 7 8 9 10
VIN = 16V@100°C
VIN = 28V@100°C
VIN = 36V@100°C
VIN = 50V@100°C
Figure 11 — Conversion efficiency
Temp °C
Load Currrent (Amps)
0
1
2
3
4
5
6
7
8
9
10
25 30 35 40 45 50 55 60 65 70 75 80 85 90 95
100 105
16V 0 LFM
28V 0 LFM
36V 0 LFM
50V 0 LFM
16V 200 LFM
28V 200 LFM
36V 200 LFM
50V 200 LFM
16V 600 LFM
28V 600 LFM
36V 600 LFM
50V 600LFM
Figure 12 — Load current vs. temperature (without heat sink)
Temp °C
Load Currrent (Amps)
16V 0 LFM
28V 0 LFM
36V 0 LFM
50V 0 LFM
16V 200 LFM
28V 200 LFM
36V 200 LFM
50V 200 LFM
16V 600 LFM
28V 600 LFM
36V 600 LFM
50V 600LFM
0
1
2
3
4
5
6
7
8
9
10
25 30 35 40 45 50 55 60 65 70 75 80 85 90 95
100 105 110 115
Figure 14 — Load current vs. temperature (11mm heat sink)
Temp °C
Load Currrent (Amps)
16V 0 LFM
28V 0 LFM
36V 0 LFM
50V 0 LFM
16V 200 LFM
28V 200 LFM
36V 200 LFM
50V 200 LFM
16V 600 LFM
28V 600 LFM
36V 600 LFM
50V 600LFM
0
1
2
3
4
5
6
7
8
9
10
25 30 35 40 45 50 55 60 65 70 75 80 85 90 95
100 105 110 115
Figure 13 — Load current vs. temperature (6.33mm heat sink)
PI3109-00-HVMZ Electrical Characteristics (Cont.)
Figure 16 — Start up, CREF = 0 (VIN = 28V, IOUT = 10A, CR,
COUT = 6 x 10µF X7R ceramic)
Figure 15 — Start up, CREF = 0 (VIN = 16V, IOUT = 10A, CR,
COUT = 6 x 10µF X7R ceramic)
28 Volt M-Grade Rev 1.8
Page 14 of 26 09/2018
PI31xx-00-HVMZ
Figure 17 — Start up, CREF = 0 (VIN = 50V, IOUT = 10A, CR,
COUT = 6 x 10µF X7R ceramic)
Figure 18 — Transient response (VIN = 28V, IOUT = 5 – 10A,
0.1A/µs, COUT = 6 x 10µF X7R ceramic)
Figure 19 — Output ripple (VIN = 28V, IOUT = 10A, CR,
COUT = 6 x 10µF X7R ceramic)
PI3109-00-HVMZ Electrical Characteristics (Cont.)
Figure 20 — Thermal image (VIN = 28V, IOUT = 10A, CR,
0LFM evaluation PCB)
28 Volt M-Grade Rev 1.8
Page 15 of 26 09/2018
PI31xx-00-HVMZ
PI3106-00-HVMZ Electrical Characteristics
Unless otherwise specified: 16V < VIN < 50V, 0A < IOUT < 4.2A, –55°C < TCASE < 100°C [a]
Parameter Symbol Conditions Min Typ Max Unit
Input Specifications
Input Voltage Range VIN 16 28 50 VDC
Input dV/dt [a] VINDVDT VIN = 50V 1.0 V/µs
Input Undervoltage Turn‑on VUVON IO = 4.2A 14.5 15.4 16 VDC
Input Undervoltage Turn‑off VUVOFF IO = 4.2A 13.5 14.4 15.2 VDC
Input Undervoltage Hysteresis VUVH IO = 4.2A 1.0 VDC
Input Overvoltage Turn‑on VOVON IO = 4.2A 50 52.3 54 VDC
Input Overvoltage Turn‑off VOVOFF IO = 4.2A 51 53.5 55 VDC
Input Overvoltage Hysteresis VOVH IO = 4.2A 1.2 VDC
Input Quiescent Current IQVIN = 28V, ENABLE = 0V 2 mADC
Input Idling Power PIDLE VIN = 28V, IOUT = 0A 3.5 W
Input Standby Power PSBY VIN = 28V, ENABLE = 0V 0.056 W
Input Current Full Load IIN
TCASE = 100°C, IOUT = 4.2A, ηFL = 88% typical,
VIN = 28V 2.045 ADC
Input Reflected Ripple Current IINRR
LIN = 0.47µH CIN = 100µF 63V electrolytic + 2 x 4.7µF
50V X7R ceramic 13 mApp
Recommended Ext Input Capacitance CIN
CIN = 100µF 63V electrolytic + 2 x 4.7µF 50V X7R
ceramic CIN = Cbulk + Chf 109.4 µF
Output Specifications
Output Voltage Set Point VOUT IOUT = 2.1A 12.0 VDC
Total Output Accuracy VOA
–0ºC < TCASE < 100ºC –3 +3 %
–55ºC < TCASE < 0ºC –5 +3 %
Output Voltage Trim Range VOADJ –20 10 %
Output Current Range IOUT 4.2 ADC
Overcurrent Protection IOCP 4.6 6.8 12 ADC
Efficiency – Full Load ηFL TCASE = 100ºC, VIN = 28V 86 88 %
Efficiency – Half Load ηHL TCASE = 100ºC, VIN = 28V 83 85 %
Output OVP Set Point VOVP 13.8 14.6 15.3 VDC
Output Ripple Voltage VORPP COUT = 6 x 2.2µF 16V X7R DC‑20MHz 150 mVpp
Switching Frequency fSW 900 kHz
Output Turn‑on Delay Time tONDLY VIN = VUVON to ENABLE = 5V; VIN rise time < 1ms 80 ms
Output Turn‑off Delay Time tOFFDLY VIN = VUVOFF to ENABLE < 2.35V 375 µs
Soft‑Start Ramp Time tSS ENABLE = 5V to 90% VOUT CREF = 0 230 µs
Maximum Load Capacitance COUT CREF = 0.22µF, COUT = Al Electrolytic 1000 µF
Load Transient Deviation VODV
IOUT = 50% step 0.1A/µS
COUT = 6 x 2.2µF 16V X7R 360 mV
Load Transient Recovery Time tOVR
IOUT = 50% step 0.1A/µS
COUT = 6 x 2.2µF 16V X7R
VOUT ≤ 1%
100 µs
Maximum Output Power POUT 50 W
Absolute Maximum Output Ratings
Name Rating
+OUT to –OUT –0.5V to 16VDC
Continuous Output Current 4.2ADC
Peak Output Current 12ADC
[a] These parameters are not production tested but are guaranteed by design, characterization and correlation with statistical process control.
Unless otherwise specified, ATE tests are completed at room temperature.
[b] Current flow sourced by a pin has a negative sign.
28 Volt M-Grade Rev 1.8
Page 16 of 26 09/2018
PI31xx-00-HVMZ
PI3106-00-HVMZ Electrical Characteristics (Cont.)
Parameter Symbol Conditions Min Typ Max Unit
ENABLE
DC Voltage Reference Output VERO 4.65 4.9 5.15 VDC
Output Current Limit [b] IECL ENABLE = 3.3V –3.3 –2.6 –1.9 mADC
Start Up Current Limit [b] IESL ENABLE = 1V –120 –90 –60 µA
Module Enable Voltage VEME 1.95 2.5 3.05 VDC
Module Disable Voltage VEMD 1.8 2.35 2.9 VDC
Disable Hysteresis VEDH 150 mV
Enable Delay Time tEE 10 µs
Disable Delay Time tED 10 µs
Maximum Capacitance CEC 1500 pF
Maximum External Toggle Rate fEXT 1 Hz
TRIM/SS
Trim Voltage Reference VREF 1.235 VDC
Internal Capacitance CREFI 10 nF
External Capacitance CREF 0.22 µF
Internal Resistance RREFI 10 kΩ
TM (Temperature Monitor)
Temperature Coefficient [a] TMTC 10 mV / ºK
Temperature Full Range Accuracy [a] TMACC –5 5 ºK
Drive Capability ITM –100 µA
TM Output Setting VTM Ambient Temperature = 300ºK 3.00 V
Thermal Specification
Junction Temperature Shutdown [a] TMAX 130 135 140 ºC
Junction‑to‑Case Thermal Impedance θJ‑C 3 ºC / W
Case‑to‑Ambient Thermal Impedance θC‑A Mounted on 9in2 1oz. Cu 6 layer PCB 25°C 8.2 ºC / W
Soldering
Peak Temperature During Reflow MSL 5; time on floor = 48 hours 225 ºC
MSL 6; time on floor = 4 hours 245 ºC
Regulatory Specification
IEC 60950‑1:2005 (2nd Edition)
EN 60950‑1:2006
IEC 61000‑4‑2
UL60950‑1:2007
CAN/CSA C22.2 NO. 60950‑1‑07
Recommended Input Fuse Rating IFUSE Fast acting LITTLEFUSE Nano2 Series Fuse 4 10 A
[a] These parameters are not production tested but are guaranteed by design, characterization and correlation with statistical process control.
Unless otherwise specified, ATE tests are completed at room temperature.
[b] Current flow sourced by a pin has a negative sign.
28 Volt M-Grade Rev 1.8
Page 17 of 26 09/2018
PI31xx-00-HVMZ
Temp °C
Load Currrent (Amps)
16V 0 LFM
28V 0 LFM
36V 0 LFM
50V 0 LFM
16V 200 LFM
28V 200 LFM
36V 200 LFM
50V 200 LFM
16V 600 LFM
28V 600 LFM
36V 600 LFM
50V 600LFM
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
2.2
2.4
2.6
2.8
3.0
3.2
3.4
3.6
3.8
4.0
4.2
25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105
Figure 22 — Load current vs. temperature (without heat sink)
Load Curent (Amps)
Efficiency
VIN = 16V@100°C
VIN = 24V@100°C
VIN = 36V@100°C
VIN = 50V@100°C
60
65
70
75
80
85
90
0.5 1 1.5 2 2.5 3 3.5 4 4.5
Figure 21 — Conversion efficiency
Temp °C
Load Currrent (Amps)
16V 0 LFM
28V 0 LFM
36V 0 LFM
50V 0 LFM
16V 200 LFM
28V 200 LFM
36V 200 LFM
50V 200 LFM
16V 600 LFM
28V 600 LFM
36V 600 LFM
50V 600LFM
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
2.2
2.4
2.6
2.8
3.0
3.2
3.4
3.6
3.8
4.0
4.2
25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110
Figure 23 — Load current vs. temperature (6.3mm heat sink)
Temp °C
Load Currrent (Amps)
16V 0 LFM
28V 0 LFM
36V 0 LFM
50V 0 LFM
16V 200 LFM
28V 200 LFM
36V 200 LFM
50V 200 LFM
16V 600 LFM
28V 600 LFM
36V 600 LFM
50V 600LFM
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
2.2
2.4
2.6
2.8
3.0
3.2
3.4
3.6
3.8
4.0
4.2
25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115
Figure 24 — Load current vs. temperature (11mm heat sink)
Figure 26 — Start up, CREF = 0 (VIN = 28V, IOUT = 4.2A, CR,
COUT = 6 x 2.2µF X7R ceramic)
Figure 25 — Start up, CREF = 0 (VIN = 16V, IOUT = 4.2A, CR,
COUT = 6 x 2.2µF X7R ceramic)
PI3106-00-HVMZ Electrical Characteristics (Cont.)
28 Volt M-Grade Rev 1.8
Page 18 of 26 09/2018
PI31xx-00-HVMZ
Figure 28 — Transient response (VIN = 28V IOUT = 2.1 – 4.2A,
0.1A/µs, COUT = 6 x 2.2µF X7R ceramic)
Figure 27 — Start up, CREF = 0 (VIN = 50V, IOUT = 4.2A, CR,
COUT = 6 x 2.2µF X7R ceramic)
Figure 29 — Output ripple (VIN = 28V IOUT = 4.2A,
COUT = 6 x 2.2µF X7R ceramic)
Figure 30 — Thermal image (VIN = 28V, IOUT = 4.2A, CR,
0LFM evaluation PCB)
PI3106-00-HVMZ Electrical Characteristics (Cont.)
28 Volt M-Grade Rev 1.8
Page 19 of 26 09/2018
PI31xx-00-HVMZ
PI3111-00-HVMZ Electrical Characteristics
Unless otherwise specified: 16V < VIN < 50V, 0A < IOUT < 3.3A, –55°C < TCASE < 100°C [a]
Parameter Symbol Conditions Min Typ Max Unit
Input Specifications
Input Voltage Range VIN 16 28 50 VDC
Input dV/dt [a] VINDVDT VIN = 50V 1.0 V/µs
Input Undervoltage Turn‑on VUVON IO = 3.3A 14.5 15.4 16 VDC
Input Undervoltage Turn‑off VUVOFF IO = 3.3A 13.5 14.3 15.2 VDC
Input Undervoltage Hysteresis VUVH IO = 3.3A 1.1 VDC
Input Overvoltage Turn‑on VOVON IO = 3.3A 50 52.4 54 VDC
Input Overvoltage Turn‑off VOVOFF IO = 3.3A 51 53.5 55 VDC
Input Overvoltage Hysteresis VOVH IO = 3.3A 1.1 VDC
Input Quiescent Current IQVIN = 28V, ENABLE = 0V 2 mADC
Input Idling Power PIDLE VIN = 28V, IOUT = 0A 4.1 W
Input Standby Power PSBY VIN = 28V, ENABLE = 0V 0.056 W
Input Current Full Load IIN
TCASE = 100°C, IOUT = 3.3A, ηFL = 87.5% typical,
VIN = 28V 2.039 ADC
Input Reflected Ripple Current IINRR
LIN = 0.47µH CIN = 100µF 63V electrolytic + 2 x 4.7µF
50V X7R ceramic 13 mApp
Recommended Ext Input Capacitance CIN
CIN = 100µF 63V electrolytic + 2 x 4.7µF 50V X7R
ceramic CIN = Cbulk + Chf 109.4 µF
Output Specifications
Output Voltage Set Point VOUT IOUT = 1.65A 15.0 VDC
Total Output Accuracy VOA
–0ºC < TCASE < 100ºC –3 +3 %
–55ºC < TCASE < 0ºC –5 +3 %
Output Voltage Trim Range VOADJ –20 10 %
Output Current Range IOUT 3.3 ADC
Overcurrent Protection IOCP 3.8 5.6 9.6 ADC
Efficiency – Full Load ηFL TCASE = 100ºC, VIN = 28V 85.5 87.5 %
Efficiency – Half Load ηHL TCASE = 100ºC, VIN = 28V 82.3 84.3 %
Output OVP Set Point VOVP 17.6 18.2 18.8 VDC
Output Ripple Voltage VORPP COUT = 6 x 2.2µF 16V X7R DC‑20MHz 275 mVpp
Switching Frequency fSW 900 kHz
Output Turn‑on Delay Time tONDLY VIN = VUVON to ENABLE = 5V; VIN rise time < 1ms 80 ms
Output Turn‑off Delay Time tOFFDLY VIN = VUVOFF to ENABLE < 2.35V 375 µs
Soft‑Start Ramp Time tSS ENABLE = 5V to 90% VOUT CREF = 0 230 µs
Maximum Load Capacitance COUT CREF = 0.22µF, COUT = Al Electrolytic 1000 µF
Load Transient Deviation VODV
IOUT = 50% step 0.1A/µS
COUT = 6 x 2.2µF 16V X7R 375 mV
Load Transient Recovery Time tOVR
IOUT = 50% step 0.1A/µS
COUT = 6 x 2.2µF 16V X7R
VOUT ≤ 1%
100 µs
Maximum Output Power POUT 50 W
Absolute Maximum Output Ratings
Name Rating
+OUT to –OUT –0.5V to 20VDC
Continuous Output Current 3.3ADC
Peak Output Current 9.6ADC
[a] These parameters are not production tested but are guaranteed by design, characterization and correlation with statistical process control.
Unless otherwise specified, ATE tests are completed at room temperature.
[b] Current flow sourced by a pin has a negative sign.
28 Volt M-Grade Rev 1.8
Page 20 of 26 09/2018
PI31xx-00-HVMZ
PI3111-00-HVMZ Electrical Characteristics (Cont.)
Parameter Symbol Conditions Min Typ Max Unit
ENABLE
DC Voltage Reference Output VERO 4.65 4.9 5.15 VDC
Output Current Limit [b] IECL ENABLE = 3.3V –3.3 –2.6 –1.9 mADC
Start Up Current Limit [b] IESL ENABLE = 1V –120 –90 –60 µA
Module Enable Voltage VEME 1.95 2.5 3.05 VDC
Module Disable Voltage VEMD 1.8 2.35 2.9 VDC
Disable Hysteresis VEDH 150 mV
Enable Delay Time tEE 10 µs
Disable Delay Time tED 10 µs
Maximum Capacitance CEC 1500 pF
Maximum External Toggle Rate fEXT 1 Hz
TRIM/SS
Trim Voltage Reference VREF 1.230 VDC
Internal Capacitance CREFI 10 nF
External Capacitance CREF 0.22 µF
Internal Resistance RREFI 10 kΩ
TM (Temperature Monitor)
Temperature Coefficient [a] TMTC 10 mV / ºK
Temperature Full Range Accuracy [a] TMACC –5 5 ºK
Drive Capability ITM –100 µA
TM Output Setting VTM Ambient Temperature = 300ºK 3.00 V
Thermal Specification
Junction Temperature Shutdown [a] TMAX 130 135 140 ºC
Junction‑to‑Case Thermal Impedance θJ‑C 3 ºC / W
Case‑to‑Ambient Thermal Impedance θC‑A Mounted on 9in2 1oz. Cu 6 layer PCB 25°C 9.4 ºC / W
Soldering
Peak Temperature During Reflow MSL 5; time on floor = 48 hours 225 ºC
MSL 6; time on floor = 4 hours 245 ºC
Regulatory Specification
IEC 60950‑1:2005 (2nd Edition)
EN 60950‑1:2006
IEC 61000‑4‑2
UL60950‑1:2007
CAN/CSA C22.2 NO. 60950‑1‑07
Recommended Input Fuse Rating IFUSE Fast acting LITTLEFUSE Nano2 Series Fuse 4 10 A
[a] These parameters are not production tested but are guaranteed by design, characterization and correlation with statistical process control.
Unless otherwise specified, ATE tests are completed at room temperature.
[b] Current flow sourced by a pin has a negative sign.
28 Volt M-Grade Rev 1.8
Page 21 of 26 09/2018
PI31xx-00-HVMZ
Temp °C
Load Currrent (Amps)
18V 0 LFM
24V 0 LFM
28V 0 LFM
36V 0 LFM
18V 200 LFM
24V 200 LFM
28V 200 LFM
36V 200 LFM
18V 600 LFM
24V 600 LFM
28V 600 LFM
36V 600LFM
0
0.3
0.6
0.9
1.2
1.5
1.8
2.1
2.4
2.7
3
3.3
25 30 35 40 45 50 55 60 65 70 75 80 85 90 95
100 105
Figure 32 — Load current vs. temperature (without heat sink)
Load Curent (Amps)
Efficiency
VIN = 16V@100°C
VIN = 28V@100°C
VIN = 36V@100°C
VIN = 50V@100°C
50
55
60
65
70
75
80
85
90
0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3 3.3
Figure 31 — Conversion efficiency
Temp °C
Load Currrent (Amps)
0
0.3
0.6
0.9
1.2
1.5
1.8
2.1
2.4
2.7
3
3.3
25 30 35 40 45 50 55 60 65 70 75 80 85 90 95
100 105 110
18V 0 LFM
24V 0 LFM
28V 0 LFM
36V 0 LFM
18V 200 LFM
24V 200 LFM
28V 200 LFM
36V 200 LFM
18V 600 LFM
24V 600 LFM
28V 600 LFM
36V 600LFM
Figure 33 — Load current vs. temperature (6.33mm heat sink)
Temp °C
Load Currrent (Amps)
18V 0 LFM
24V 0 LFM
28V 0 LFM
36V 0 LFM
18V 200 LFM
24V 200 LFM
28V 200 LFM
36V 200 LFM
18V 600 LFM
24V 600 LFM
28V 600 LFM
36V 600LFM
0
0.33
0.66
0.99
1.32
1.65
1.98
2.31
2.64
2.97
3.3
25 30 35 40 45 50 55 60 65 70 75 80 85 90 95
100 105 110 115
Figure 34 — Load current vs. temperature (11mm heat sink)
Figure 36 — Start up, CREF = 0 (VIN = 28V, IOUT = 3.3A, CR,
COUT = 6 x 2.2µF X7R ceramic)
Figure 35 — Start up, CREF = 0 (VIN = 16V, IOUT = 3.3A, CR,
COUT = 6 x 2.2µF X7R ceramic)
PI3111-00-HVMZ Electrical Characteristics (Cont.)
28 Volt M-Grade Rev 1.8
Page 22 of 26 09/2018
PI31xx-00-HVMZ
Figure 38 — Transient response (VIN = 28V, IOUT = 1.65 – 3.3A,
0.1A/µs, COUT = 6 x 2.2µF X7R ceramic)
Figure 37 — Start up, CREF = 0 (VIN = 50V, IOUT = 3.3A, CR,
COUT = 6 x 2.2µF X7R ceramic)
Figure 39 — Output ripple (VIN = 28V, IOUT = 3.3A,
COUT = 6 x 2.2µF X7R ceramic)
Figure 40 — Thermal image (VIN = 28V, IOUT = 3.33A, CR,
0LFM Evaluation PCB)
PI3111-00-HVMZ Electrical Characteristics (Cont.)
28 Volt M-Grade Rev 1.8
Page 23 of 26 09/2018
PI31xx-00-HVMZ
Functional Description
Input Power Pins IN(+) and IN(–)
The input power pins on the PI31xx‑00‑HVMZ are connected to
the input power source which can range from 16 – 50VDC. Under
surge conditions, the PI31xx‑00‑HVMZ can withstand up to 55VDC
for 12.5ms without incurring damage. The user should take care to
avoid driving the input rails above the specified ratings. Since the
PI31xx‑00‑HVMZ is designed with high reliability in mind, the input
pins are continuously monitored. If the applied voltage exceeds
the input overvoltage trip point (typically 53.5V) the conversion
process shall be terminated immediately. The converter initiates
soft start automatically within 80ms after the input voltage is
reduced back to the appropriate value. The input pins do not have
reverse‑polarity protection. If the PI31xx‑00‑HVMZ is operated
in an environment where reverse polarity is a concern, the user
should consider using a polarity protection device such as a suitably
rated diode. To avoid the high losses of using a diode, the user
should consider the much higher efficiency family of intelligent
Cool‑ORing® solutions that can be used in reverse‑polarity
applications. Information is available at vicorpower.com.
The PI31xx‑00‑HVMZ will draw nearly zero current until the input
voltage reaches the internal start up threshold. If the ENABLE
pin is not pulled low by external circuitry, the output voltage will
begin rising to its final output value about 80ms after the input UV
lockout releases. This will occur automatically even if the ENABLE
pin is floating.
To help keep the source impedance low, the input to the
PI31xx‑00‑HVMZ should be bypassed with (2) 4.7µF 50V ceramic
capacitors of X7R dielectric in parallel with a low Q 100µF 63V
electrolytic capacitor. To reduce EMI and reflected ripple current, a
series inductor of 0.2 – 0.47µH can be added. The input traces to
the module should be low impedance configured in such a manner
as to keep stray inductance minimized.
ENABLE
The ENABLE pin serves as a multi‑function pin for the
PI31xx‑00‑HVMZ. During normal operation, it outputs the
on‑board 4.9V regulator which can be used for trimming the
module up. The ENABLE pin can also be used as a remote enable
pin either from the secondary via an optocoupler and an external
isolated bias supply or from the primary side through a small‑signal
transistor, FET, or any device that sinks 3.3mA, minimum.
If the ENABLE pin is lower than 2.35V typical, the converter will
be held off or shut down if already operating. A third feature is
offered in that during a fault condition, such as output OVP, input
UV or OV, or output current limit, the ENABLE pin is pulled low
internally. This can be used as a signal to the user that a fault has
occurred. Whenever the ENABLE pin is pulled low, the TRIM/SS pin
follows, resetting the internal and external soft‑start circuitry. All
faults will pull ENABLE low including overtemperature. If increased
turn‑on delay is desired, the ENABLE pin can be bypassed with a
small capacitor up to a maximum of 1500pF.
TRIM/SS Pin
The TRIM/SS pin serves as another multi‑purpose pin. First, it is
used as the reference for the internal error amplifier. Connecting a
resistor from TRIM/SS to SGND allows the reference to be margined
down by as much as –20%. Connecting a resistor from TRIM/
SS to ENABLE will allow the reference and output voltage to be
margined up by 10%. If the user wishes a longer start up time, a
small ceramic capacitor can be added to TRIM/SS to increase it. It
is critical to connect any device between TRIM/SS and SGND and
not –IN, otherwise high frequency noise will be introduced to the
reference and possibly cause erratic operation. Referring to the
figures below, the appropriate trim up or trim‑down resistor can be
calculated using the equivalent circuit diagram and the equations.
When trimming up, the trim‑down resistor is not populated. When
trimming down, the trim‑up resistor is not populated. The soft‑start
time is adjustable and has a default value of 500µs to reach steady
state. The internal soft‑start capacitor value is 10nF.
PI31xx
RREFI
RLOW
RHIGH
TRIM/SS
VREF
VERO
SGND
ENABLE
10kΩ
U.S. PATS. LISTED ON PACKING MATERIALS & DATASHEETS
MADE
IN
USA
DC-DC
Converter
Figure 41 — PI31xx‑00‑HVMZ shown with system fuse,
filter, decoupling and extended soft start
Figure 42 — Trim equations and equivalent circuit
RLOW = (–VDESIRED ) •
R
REFI
(–VOUT_NOM) + VDESIRED
RHIGH = (–RREFI ) • (–VOUT_NOM) • VERO + VDESIRED• VRE
F
VREF (–VOUT_NOM) + VDESIRED
()
CREF = TSS_DESIRED – 230 • 10-6
23000
28 Volt M-Grade Rev 1.8
Page 24 of 26 09/2018
PI31xx-00-HVMZ
TM
The TM pin serves as an output indicator of the internal package
temperature which is within ±5°K of the hottest junction
temperature. Because of this, it is a good indicator of a thermal
overload condition. The output is a scaled, buffered analog voltage
which indicates the internal temperature in degrees Kelvin. Upon
a thermal overload, the TM pin is pulled low, indicating a thermal
fault has occurred. Upon restart of the converter, the TM pin
reverts back to a buffered monitor. The thermal shutdown function
of the PI31xx‑00‑HVMZ is a fault feature which interrupts power
processing if a certain maximum temperature is exceeded. TM can
be monitored by an external microcontroller or circuit configured as
an adaptive fan speed controller so that air flow in the system can
be conveniently regulated.
SGND
The PI31xx‑00‑HVMZ SGND pin is the “quiet” control circuitry
return. It is basically an extension of the internal signal ground.
To avoid contamination and potential ground loops, this ground
should NOT be connected to –IN since it is already star connected
inside the package. Connect signal logic to SGND.
Output Power Pins +OUT and –OUT
The output power terminals OUT(+) and OUT(–) deliver the
maximum output current from the PI31xx‑00‑HVMZ through the
J‑lead output pins. This configuration allows for a low impedance
output and should be connected to multi‑layer PCB parallel planes
for best performance. Due to the high switching frequency, output
ripple and noise can be easily attenuated by adding just a few
high‑quality X7R ceramic capacitors while retaining adequate
transient response for most applications. The PI31xx‑00‑HVMZ
does not require any feedback loop compensation nor does it
require any opto‑isolation. All isolation is contained within the
package. This greatly simplifies the use of the converter and
eliminates all outside influences of noise on the quality of the
output voltage regulation and feedback loop. It is important for
the user to minimize resistive connections from the load to the
converter output and to keep stray inductance to a minimum for
best regulation and transient response. The very small size footprint
and height of the PI31xx‑00‑HVMZ allows the converter to be
placed in the optimum location to allow for tight connections to
the point‑of‑load.
28 Volt M-Grade Rev 1.8
Page 25 of 26 09/2018
PI31xx-00-HVMZ
Package Outline & Recommended PCB Land Pattern
Figure 43 — Package outline & recommended PCB land pattern
28 Volt M-Grade Rev 1.8
Page 26 of 26 09/2018
PI31xx-00-HVMZ
Contact Us: http://www.vicorpower.com/contact‑us
Vicor Corporation
25 Frontage Road
Andover, MA, USA 01810
Tel: 800‑735‑6200
Fax: 978‑475‑6715
www.vicorpower.com
email
Customer Service: custserv@vicorpower.com
Technical Support: apps@vicorpower.com
Vicor’s comprehensive line of power solutions includes high density AC-DC and DC-DC modules and
accessory components, fully configurable AC-DC and DC-DC power supplies, and complete custom
power systems.
Information furnished by Vicor is believed to be accurate and reliable. However, no responsibility is assumed by Vicor for its use. Vicor
makes no representations or warranties with respect to the accuracy or completeness of the contents of this publication. Vicor reserves
the right to make changes to any products, specifications, and product descriptions at any time without notice. Information published by
Vicor has been checked and is believed to be accurate at the time it was printed; however, Vicor assumes no responsibility for inaccuracies.
Testing and other quality controls are used to the extent Vicor deems necessary to support Vicor’s product warranty. Except where
mandated by government requirements, testing of all parameters of each product is not necessarily performed.
Specifications are subject to change without notice.
Visit http://www.vicorpower.com/pi31xx‑isolated‑regulated‑dc‑dc‑converter for the latest product information.
Vicor’s Standard Terms and Conditions and Product Warranty
All sales are subject to Vicor’s Standard Terms and Conditions of Sale, and Product Warranty which are available on Vicor’s webpage
(http://www.vicorpower.com/termsconditionswarranty) or upon request.
Life Support Policy
VICOR’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE
EXPRESS PRIOR WRITTEN APPROVAL OF THE CHIEF EXECUTIVE OFFICER AND GENERAL COUNSEL OF VICOR CORPORATION. As used
herein, life support devices or systems are devices which (a) are intended for surgical implant into the body, or (b) support or sustain life and
whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected to
result in a significant injury to the user. A critical component is any component in a life support device or system whose failure to perform
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and Conditions of Sale, the user of Vicor products and components in life support applications assumes all risks of such use and indemnifies
Vicor against all liability and damages.
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products described in this data sheet. No license, whether express, implied, or arising by estoppel or otherwise, to any intellectual property
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The products described on this data sheet are protected by U.S. Patents. Please see www.vicorpower.com/patents for the latest
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