Not Recommended for New Designs
28 Volt
M-Grade
PI31xx-00-HVMZ
28VIN, 3.3 to 15VOUT, ZVS Isolated Converter Module Family
Product Description
Features & Benefits
The ZVS Isolated Converter Module Series consists of high‑density
isolated DC-DC converters implementing Zero-Voltage
Switching topology.
• Efficiency up to 88%
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.
Device
Output Voltage
• 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
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
• Wide trim range +10/–20% most models
• Temperature Monitor (TM) &
Overtemperature Protection (OTP)
• Input UVLO & OVLO and output OVP
• Overcurrent protection with auto restart
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.
• Adjustable soft start
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.
• Wide Temperature, Aerospace & Defense Applications
• 2250VDC input-to-output isolation
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
28 Volt M-Grade
Page 1 of 26
Rev 1.8
09/2018
Not Recommended for New Designs 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
Page 2 of 26
Rev 1.8
09/2018
Not Recommended for New Designs 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
Page 3 of 26
Rev 1.8
09/2018
Not Recommended for New Designs 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
Page 4 of 26
Rev 1.8
09/2018
Not Recommended for New Designs PI31xx-00-HVMZ
Functional Block Diagram
+OUT
RUN
BIAS
START
BIAS
Synchronous
Rectifier
Vcc
-OUT
ZVS POWER
TRAIN
+IN
Driver
Driver
ZVS POWER
TRAIN
ZVS
Fast Current Limit
+
-
-IN
DC
FB
Output OVP
+
-
FB
DC
+
-
DC
+
DC
Timing
Logic
Reset
Enable
Period Ramp
+
-
+
On-Duty Ramp
DC
LFF
ENB
ENABLE
+5V
DC
Slow Current Limit
Input UVP
+
-
+
-
120µs
delay
DC
Input OVP
+
-
CFB2
EA Fault
RFB1
CFB1
+
FB
+
-
DC
120µs
delay
+
-
Over Temp
DC
Error Amp
+
DC
TM
ENB
TRIM/SS
RSS
VREF
1.22V
Temp
Sensor
CSS INT
SGND
Fault
28 Volt M-Grade
Page 5 of 26
Rev 1.8
09/2018
Fault
Latch
And
Reset
Logic
Not Recommended for New Designs PI31xx-00-HVMZ
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.
Package Pinout
+IN
SGND
TM
TRIM/SS
ENABLE
-IN
28 Volt M-Grade
Page 6 of 26
DC-DC
Converter
MADE
IN
USA
+OUT
-OUT
U.S. PATS. LISTED ON PACKING MATERIALS & DATASHEETS
Rev 1.8
09/2018
Not Recommended for New Designs 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
16
28
Max
Unit
Input Specifications
Input Voltage Range
Input dV/dt [a]
VIN
VINDVDT
VIN = 50V
Input Undervoltage Turn-on
VUVON
IO = 10A
14.5
Input Undervoltage Turn-off
VUVOFF
IO = 10A
13.5
Input Undervoltage Hysteresis
VUVH
IO = 10A
Input Overvoltage Turn-on
VOVON
IO = 10A
50
Input Overvoltage Turn-off
VOVOFF
IO = 10A
51
VOVH
IO = 10A
Input Overvoltage Hysteresis
Input Quiescent Current
IQ
VIN = 28V, ENABLE = 0V
PIDLE
VIN = 28V, IOUT = 0A
Input Standby Power
PSBY
VIN = 28V, ENABLE = 0V
IIN
Input Reflected Ripple Current
IINRR
Recommended Ext Input Capacitance
CIN
VDC
V/µs
15.3
16
VDC
14.1
15.2
VDC
52.5
54
VDC
53.7
55
VDC
1.2
Input Idling Power
Input Current Full Load
50
1.0
TCASE = 100°C, IOUT = 10A, ηFL = 86% typical,
VIN = 28V
LIN = 0.47µH CIN = 100µF 63V electrolytic + 2 x 4.7µF
50V X7R ceramic
CIN = 100µF 63V electrolytic + 2 x 4.7µF 50V X7R
ceramic CIN = Cbulk + Chf
VDC
1.2
VDC
2
mADC
2.6
W
0.048
W
1.37
ADC
15
mApp
109.4
µF
Output Specifications
Output Voltage Set Point
Total Output Accuracy
Output Voltage Trim Range
VOUT
VOA
IOUT
Overcurrent Protection
IOCP
ηFL
Efficiency – Half Load
ηHL
Output OVP Set Point
VOVP
Output Ripple Voltage
VORPP
Switching Frequency
3.3
VDC
–0ºC < TCASE < 100ºC
–3
+3
%
–55ºC < TCASE < 0ºC
–5
+3
%
–10
10
%
10
ADC
20
ADC
VOADJ
Output Current Range
Efficiency – Full Load
IOUT = 5A
TCASE = 100ºC, VIN = 28V
TCASE = 100ºC, VIN = 28V
COUT = 6 x 10µF 10V X7R DC-20MHz
fSW
11.0
15
84
86
80
82
3.9
4.1
%
%
4.3
VDC
90
mVpp
900
kHz
ms
Output Turn-on Delay Time
tONDLY
VIN = VUVON to ENABLE = 5V; VIN rise time < 1ms
80
Output Turn-off Delay Time
tOFFDLY
VIN = VUVOFF to ENABLE < 2.35V
375
µs
tSS
ENABLE = 5V to 90% VOUT CREF = 0
380
µs
COUT
CREF = 0.22µF, COUT = Al Electrolytic
Soft-Start Ramp Time
Maximum Load Capacitance
Load Transient Deviation
VODV
Load Transient Recovery Time
tOVR
Maximum Output Power
POUT
IOUT = 50% step 0.1A/µS
COUT = 6 x 10µF 10V X7R
IOUT = 50% step 0.1A/µS
COUT = 6 x 10µF 10V X7R
VOUT ≤ 1%
4700
145
mV
100
µs
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
Page 7 of 26
Rev 1.8
09/2018
µF
Not Recommended for New Designs PI31xx-00-HVMZ
PI3108-00-HVMZ Electrical Characteristics (Cont.)
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
4.65
4.9
5.15
VDC
ENABLE
DC Voltage Reference Output
Output Current Limit
VERO
[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 Voltage Reference
VREF
1.240
VDC
Internal Capacitance
CREFI
10
nF
External Capacitance
CREF
Internal Resistance
RREFI
TRIM/SS
0.22
µF
10
kΩ
10
mV / ºK
TM (Temperature Monitor)
Temperature Coefficient
[a]
TMTC
[a]
Temperature Full Range Accuracy
TMACC
Drive Capability
ITM
TM Output Setting
VTM
–5
5
–100
Ambient Temperature = 300ºK
ºK
µA
3.00
V
Thermal Specification
Junction Temperature Shutdown
[a]
TMAX
Junction-to-Case Thermal Impedance
θJ-C
Case-to-Ambient Thermal Impedance
θC-A
130
Mounted on 9in2 1oz. Cu 6 layer PCB 25°C
135
140
ºC
3
ºC / W
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
10
A
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
[a]
4
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
Page 8 of 26
Rev 1.8
09/2018
Not Recommended for New Designs PI31xx-00-HVMZ
PI3108-00-HVMZ Electrical Characteristics (Cont.)
10
85
9
Load Currrent (Amps)
90
Efficiency
80
75
VIN = 16V@100°C
VIN = 28V@100°C
VIN = 50V@100°C
70
65
60
55
50
8
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
7
6
5
4
3
2
1
0
1
2
3
4
5
6
7
Load Curent (Amps)
8
9
10
25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105110 115
Temp °C
Figure 1 — Conversion efficiency
Figure 4 — Load current vs. temperature (11mm heat sink)
Load Currrent (Amps)
10
9
8
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
7
6
5
4
3
2
1
0
25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100105110
Temp °C
Figure 2 — Load current vs. temperature (without heat sink)
Figure 5 — Start up, CREF = 0 (VIN = 16V, IOUT = 10A, CR,
COUT = 6 x 10µF X7R ceramic)
Load Currrent (Amps)
10
9
8
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
7
6
5
4
3
2
1
0
25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105110 115
Temp °C
Figure 3 — Load current vs. temperature (6.33mm heat sink)
28 Volt M-Grade
Page 9 of 26
Figure 6 — Start up, CREF = 0 (VIN = 28V, IOUT = 10A, CR,
COUT = 6 x 10µF X7R ceramic)
Rev 1.8
09/2018
Not Recommended for New Designs PI31xx-00-HVMZ
PI3108-00-HVMZ Electrical Characteristics (Cont.)
Figure 7 — Start up, CREF = 0 (VIN = 50V, IOUT = 10A, CR,
COUT = 6 x 10µF X7R ceramic)
Figure 10 — Thermal image
(VIN = 28V, IOUT = 10A, CR, 0LFM evaluation PCB)
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)
28 Volt M-Grade
Rev 1.8
Page 10 of 26 09/2018
Not Recommended for New Designs 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
16
28
Max
Unit
Input Specifications
Input Voltage Range
Input dV/dt [a]
VIN
50
VDC
1.0
V/µs
15.3
16
VDC
14.1
15.2
VDC
VINDVDT
VIN = 50V
Input Undervoltage Turn-on
VUVON
IO = 10A
14.5
Input Undervoltage Turn-off
VUVOFF
IO = 10A
13.5
Input Undervoltage Hysteresis
VUVH
IO = 10A
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
VOVH
IO = 10A
Input Overvoltage Hysteresis
Input Quiescent Current
IQ
1.2
VIN = 28V, ENABLE = 0V
Input Idling Power
PIDLE
VIN = 28V, IOUT = 0A
Input Standby Power
PSBY
VIN = 28V, ENABLE = 0V
Input Current Full Load
IIN
Input Reflected Ripple Current
IINRR
Recommended Ext Input Capacitance
CIN
TCASE = 100°C, IOUT = 10A, ηFL = 88% typical,
VIN = 28V
LIN = 0.47µH CIN = 100µF 63V electrolytic + 2 x 4.7µF
50V X7R ceramic
CIN = 100µF 63V electrolytic + 2 x 4.7µF 50V X7R
ceramic CIN = Cbulk + Chf
VDC
1.2
VDC
2
mADC
3.5
W
0.056
W
2.03
ADC
13
mApp
109.4
µF
Output Specifications
Output Voltage Set Point
Total Output Accuracy
Output Voltage Trim Range
VOUT
VOA
IOUT
Overcurrent Protection
IOCP
ηFL
Efficiency – Half Load
ηHL
Output OVP Set Point
VOVP
Output Ripple Voltage
VORPP
Switching Frequency
5.0
VDC
–0ºC < TCASE < 100ºC
–3
+3
%
–55ºC < TCASE < 0ºC
–5
+3
%
–20
10
%
10
ADC
20
ADC
VOADJ
Output Current Range
Efficiency – Full Load
IOUT = 5A
10.8
15
TCASE = 100ºC, VIN = 28V
86
88
TCASE = 100ºC, VIN = 28V
83.5
85.5
6.0
6.3
COUT = 6 x 10µF 10V X7R DC-20MHz
fSW
%
%
6.6
VDC
135
mVpp
900
kHz
ms
Output Turn-on Delay Time
tONDLY
VIN = VUVON to ENABLE = 5V; VIN rise time < 1ms
80
Output Turn-off Delay Time
tOFFDLY
VIN = VUVOFF to ENABLE < 2.35V
375
µs
tSS
ENABLE = 5V to 90% VOUT CREF = 0
230
µs
COUT
CREF = 0.22µF, COUT = Al Electrolytic
Soft-Start Ramp Time
Maximum Load Capacitance
Load Transient Deviation
VODV
Load Transient Recovery Time
tOVR
Maximum Output Power
POUT
IOUT = 50% step 0.1A/µS
COUT = 6 x 10µF 10V X7R
IOUT = 50% step 0.1A/µS
COUT = 6 x 10µF 10V X7R
VOUT ≤ 1%
4700
90
mV
100
µs
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 11 of 26 09/2018
µF
Not Recommended for New Designs PI31xx-00-HVMZ
PI3109-00-HVMZ Electrical Characteristics (Cont.)
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
4.65
4.9
5.15
VDC
ENABLE
DC Voltage Reference Output
Output Current Limit
VERO
[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 Voltage Reference
VREF
1.240
VDC
Internal Capacitance
CREFI
10
nF
External Capacitance
CREF
Internal Resistance
RREFI
TRIM/SS
0.22
µF
10
kΩ
10
mV / ºK
TM (Temperature Monitor)
Temperature Coefficient
[a]
TMTC
[a]
Temperature Full Range Accuracy
TMACC
Drive Capability
ITM
TM Output Setting
VTM
–5
5
–100
Ambient Temperature = 300ºK
ºK
µA
3.00
V
Thermal Specification
Junction Temperature Shutdown
[a]
TMAX
Junction-to-Case Thermal Impedance
θJ-C
Case-to-Ambient Thermal Impedance
θC-A
130
Mounted on 9in2 1oz. Cu 6 layer PCB 25°C
135
140
ºC
3
ºC / W
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
10
A
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
[a]
4
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
Not Recommended for New Designs PI31xx-00-HVMZ
PI3109-00-HVMZ Electrical Characteristics (Cont.)
10
85
9
Load Currrent (Amps)
90
Efficiency
80
75
VIN = 16V@100°C
VIN = 28V@100°C
VIN = 36V@100°C
VIN = 50V@100°C
70
65
60
55
50
7
6
5
4
3
2
1
0
1
2
3
4
5
6
7
Load Curent (Amps)
8
9
10
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
8
25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105110 115
Temp °C
Figure 11 — Conversion efficiency
Figure 14 — Load current vs. temperature (11mm heat sink)
Load Currrent (Amps)
10
9
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
8
7
6
5
4
3
2
1
0
25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105
Temp °C
Figure 12 — Load current vs. temperature (without heat sink)
Figure 15 — Start up, CREF = 0 (VIN = 16V, IOUT = 10A, CR,
COUT = 6 x 10µF X7R ceramic)
Load Currrent (Amps)
10
9
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
8
7
6
5
4
3
2
1
0
25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105110 115
Temp °C
Figure 13 — Load current vs. temperature (6.33mm heat sink)
Figure 16 — Start up, CREF = 0 (VIN = 28V, IOUT = 10A, CR,
COUT = 6 x 10µF X7R ceramic)
28 Volt M-Grade
Rev 1.8
Page 13 of 26 09/2018
Not Recommended for New Designs PI31xx-00-HVMZ
PI3109-00-HVMZ Electrical Characteristics (Cont.)
Figure 17 — Start up, CREF = 0 (VIN = 50V, IOUT = 10A, CR,
COUT = 6 x 10µF X7R ceramic)
Figure 20 — Thermal image (VIN = 28V, IOUT = 10A, CR,
0LFM evaluation PCB)
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)
28 Volt M-Grade
Rev 1.8
Page 14 of 26 09/2018
Not Recommended for New Designs 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
16
28
Max
Unit
Input Specifications
Input Voltage Range
Input dV/dt [a]
VIN
VINDVDT
VIN = 50V
Input Undervoltage Turn-on
VUVON
IO = 4.2A
14.5
Input Undervoltage Turn-off
VUVOFF
IO = 4.2A
13.5
Input Undervoltage Hysteresis
VUVH
IO = 4.2A
Input Overvoltage Turn-on
VOVON
IO = 4.2A
50
Input Overvoltage Turn-off
VOVOFF
IO = 4.2A
51
VOVH
IO = 4.2A
Input Overvoltage Hysteresis
Input Quiescent Current
IQ
VIN = 28V, ENABLE = 0V
PIDLE
VIN = 28V, IOUT = 0A
Input Standby Power
PSBY
VIN = 28V, ENABLE = 0V
IIN
Input Reflected Ripple Current
IINRR
Recommended Ext Input Capacitance
CIN
VDC
V/µs
15.4
16
VDC
14.4
15.2
VDC
52.3
54
VDC
53.5
55
VDC
1.0
Input Idling Power
Input Current Full Load
50
1.0
TCASE = 100°C, IOUT = 4.2A, ηFL = 88% typical,
VIN = 28V
LIN = 0.47µH CIN = 100µF 63V electrolytic + 2 x 4.7µF
50V X7R ceramic
CIN = 100µF 63V electrolytic + 2 x 4.7µF 50V X7R
ceramic CIN = Cbulk + Chf
VDC
1.2
VDC
2
mADC
3.5
W
0.056
W
2.045
ADC
13
mApp
109.4
µF
Output Specifications
Output Voltage Set Point
Total Output Accuracy
Output Voltage Trim Range
VOUT
VOA
IOUT
Overcurrent Protection
IOCP
ηFL
Efficiency – Half Load
ηHL
Output OVP Set Point
VOVP
Output Ripple Voltage
VORPP
Switching Frequency
12.0
VDC
–0ºC < TCASE < 100ºC
–3
+3
%
–55ºC < TCASE < 0ºC
–5
+3
%
VOADJ
Output Current Range
Efficiency – Full Load
IOUT = 2.1A
–20
TCASE = 100ºC, VIN = 28V
TCASE = 100ºC, VIN = 28V
COUT = 6 x 2.2µF 16V X7R DC-20MHz
fSW
4.6
6.8
86
88
83
85
13.8
14.6
10
%
4.2
ADC
12
ADC
%
%
15.3
VDC
150
mVpp
900
kHz
ms
Output Turn-on Delay Time
tONDLY
VIN = VUVON to ENABLE = 5V; VIN rise time < 1ms
80
Output Turn-off Delay Time
tOFFDLY
VIN = VUVOFF to ENABLE < 2.35V
375
µs
tSS
ENABLE = 5V to 90% VOUT CREF = 0
230
µs
COUT
CREF = 0.22µF, COUT = Al Electrolytic
Soft-Start Ramp Time
Maximum Load Capacitance
Load Transient Deviation
VODV
Load Transient Recovery Time
tOVR
Maximum Output Power
POUT
IOUT = 50% step 0.1A/µS
COUT = 6 x 2.2µF 16V X7R
IOUT = 50% step 0.1A/µS
COUT = 6 x 2.2µF 16V X7R
VOUT ≤ 1%
1000
360
mV
100
µs
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 15 of 26 09/2018
µF
Not Recommended for New Designs PI31xx-00-HVMZ
PI3106-00-HVMZ Electrical Characteristics (Cont.)
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
4.65
4.9
5.15
VDC
ENABLE
DC Voltage Reference Output
Output Current Limit
VERO
[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 Voltage Reference
VREF
1.235
VDC
Internal Capacitance
CREFI
10
nF
External Capacitance
CREF
Internal Resistance
RREFI
TRIM/SS
0.22
µF
10
kΩ
10
mV / ºK
TM (Temperature Monitor)
Temperature Coefficient
[a]
TMTC
[a]
Temperature Full Range Accuracy
TMACC
Drive Capability
ITM
TM Output Setting
VTM
–5
5
–100
Ambient Temperature = 300ºK
ºK
µA
3.00
V
Thermal Specification
Junction Temperature Shutdown
[a]
TMAX
Junction-to-Case Thermal Impedance
θJ-C
Case-to-Ambient Thermal Impedance
θC-A
130
Mounted on 9in2 1oz. Cu 6 layer PCB 25°C
135
140
ºC
3
ºC / W
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
10
A
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
[a]
4
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
Not Recommended for New Designs PI31xx-00-HVMZ
PI3106-00-HVMZ Electrical Characteristics (Cont.)
90
Load Currrent (Amps)
Efficiency
85
80
VIN = 16V@100°C
VIN = 24V@100°C
VIN = 36V@100°C
VIN = 50V@100°C
75
70
65
60
0.5
1
1.5
2
2.5
3
Load Curent (Amps)
3.5
4
4.5
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
25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115
Temp °C
Figure 21 — Conversion efficiency
4.2
4.0
3.8
3.6
3.4
3.2
3.0
2.8
2.6
2.4
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
4.2
4.0
3.8
3.6
3.4
3.2
3.0
2.8
2.6
2.4
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
Figure 24 — Load current vs. temperature (11mm heat sink)
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
25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105
Temp °C
Load Currrent (Amps)
Figure 22 — Load current vs. temperature (without heat sink)
4.2
4.0
3.8
3.6
3.4
3.2
3.0
2.8
2.6
2.4
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
Figure 25 — Start up, CREF = 0 (VIN = 16V, IOUT = 4.2A, CR,
COUT = 6 x 2.2µF X7R ceramic)
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
25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110
Temp °C
Figure 23 — Load current vs. temperature (6.3mm heat sink)
Figure 26 — Start up, CREF = 0 (VIN = 28V, IOUT = 4.2A, CR,
COUT = 6 x 2.2µF X7R ceramic)
28 Volt M-Grade
Rev 1.8
Page 17 of 26 09/2018
Not Recommended for New Designs PI31xx-00-HVMZ
PI3106-00-HVMZ Electrical Characteristics (Cont.)
Figure 27 — Start up, CREF = 0 (VIN = 50V, IOUT = 4.2A, CR,
COUT = 6 x 2.2µF X7R ceramic)
Figure 30 — Thermal image (VIN = 28V, IOUT = 4.2A, CR,
0LFM evaluation PCB)
Figure 28 — Transient response (VIN = 28V IOUT = 2.1 – 4.2A,
0.1A/µs, COUT = 6 x 2.2µF X7R ceramic)
Figure 29 — Output ripple (VIN = 28V IOUT = 4.2A,
COUT = 6 x 2.2µF X7R ceramic)
28 Volt M-Grade
Rev 1.8
Page 18 of 26 09/2018
Not Recommended for New Designs 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
16
28
Max
Unit
Input Specifications
Input Voltage Range
Input dV/dt [a]
VIN
VINDVDT
VIN = 50V
Input Undervoltage Turn-on
VUVON
IO = 3.3A
14.5
Input Undervoltage Turn-off
VUVOFF
IO = 3.3A
13.5
Input Undervoltage Hysteresis
VUVH
IO = 3.3A
Input Overvoltage Turn-on
VOVON
IO = 3.3A
50
Input Overvoltage Turn-off
VOVOFF
IO = 3.3A
51
VOVH
IO = 3.3A
Input Overvoltage Hysteresis
Input Quiescent Current
IQ
VIN = 28V, ENABLE = 0V
PIDLE
VIN = 28V, IOUT = 0A
Input Standby Power
PSBY
VIN = 28V, ENABLE = 0V
IIN
Input Reflected Ripple Current
IINRR
Recommended Ext Input Capacitance
CIN
VDC
V/µs
15.4
16
VDC
14.3
15.2
VDC
52.4
54
VDC
53.5
55
VDC
1.1
Input Idling Power
Input Current Full Load
50
1.0
TCASE = 100°C, IOUT = 3.3A, ηFL = 87.5% typical,
VIN = 28V
LIN = 0.47µH CIN = 100µF 63V electrolytic + 2 x 4.7µF
50V X7R ceramic
CIN = 100µF 63V electrolytic + 2 x 4.7µF 50V X7R
ceramic CIN = Cbulk + Chf
VDC
1.1
VDC
2
mADC
4.1
W
0.056
W
2.039
ADC
13
mApp
109.4
µF
Output Specifications
Output Voltage Set Point
Total Output Accuracy
Output Voltage Trim Range
VOUT
VOA
IOUT
Overcurrent Protection
IOCP
ηFL
Efficiency – Half Load
ηHL
Output OVP Set Point
VOVP
Output Ripple Voltage
VORPP
Switching Frequency
15.0
VDC
–0ºC < TCASE < 100ºC
–3
+3
%
–55ºC < TCASE < 0ºC
–5
+3
%
VOADJ
Output Current Range
Efficiency – Full Load
IOUT = 1.65A
–20
TCASE = 100ºC, VIN = 28V
TCASE = 100ºC, VIN = 28V
COUT = 6 x 2.2µF 16V X7R DC-20MHz
fSW
3.8
5.6
85.5
87.5
82.3
84.3
17.6
18.2
10
%
3.3
ADC
9.6
ADC
%
%
18.8
VDC
275
mVpp
900
kHz
ms
Output Turn-on Delay Time
tONDLY
VIN = VUVON to ENABLE = 5V; VIN rise time < 1ms
80
Output Turn-off Delay Time
tOFFDLY
VIN = VUVOFF to ENABLE < 2.35V
375
µs
tSS
ENABLE = 5V to 90% VOUT CREF = 0
230
µs
COUT
CREF = 0.22µF, COUT = Al Electrolytic
Soft-Start Ramp Time
Maximum Load Capacitance
Load Transient Deviation
VODV
Load Transient Recovery Time
tOVR
Maximum Output Power
POUT
IOUT = 50% step 0.1A/µS
COUT = 6 x 2.2µF 16V X7R
IOUT = 50% step 0.1A/µS
COUT = 6 x 2.2µF 16V X7R
VOUT ≤ 1%
1000
375
mV
100
µs
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 19 of 26 09/2018
µF
Not Recommended for New Designs PI31xx-00-HVMZ
PI3111-00-HVMZ Electrical Characteristics (Cont.)
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
4.65
4.9
5.15
VDC
ENABLE
DC Voltage Reference Output
Output Current Limit
VERO
[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 Voltage Reference
VREF
1.230
VDC
Internal Capacitance
CREFI
10
nF
External Capacitance
CREF
Internal Resistance
RREFI
TRIM/SS
0.22
µF
10
kΩ
10
mV / ºK
TM (Temperature Monitor)
Temperature Coefficient
[a]
TMTC
[a]
Temperature Full Range Accuracy
TMACC
Drive Capability
ITM
TM Output Setting
VTM
–5
5
–100
Ambient Temperature = 300ºK
ºK
µA
3.00
V
Thermal Specification
Junction Temperature Shutdown
[a]
TMAX
Junction-to-Case Thermal Impedance
θJ-C
Case-to-Ambient Thermal Impedance
θC-A
130
Mounted on 9in2 1oz. Cu 6 layer PCB 25°C
135
140
ºC
3
ºC / W
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
10
A
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
[a]
4
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
Not Recommended for New Designs PI31xx-00-HVMZ
PI3111-00-HVMZ Electrical Characteristics (Cont.)
3.3
85
2.97
Load Currrent (Amps)
90
Efficiency
80
75
VIN = 16V@100°C
VIN = 28V@100°C
VIN = 36V@100°C
VIN = 50V@100°C
70
65
60
55
50
2.31
1.98
1.65
1.32
0.99
0.66
0.33
0
0.3
0.6
0.9
1.2
1.5
1.8
2.1
2.4
Load Curent (Amps)
2.7
3
3.3
25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100105110 115
Temp °C
Figure 31 — Conversion efficiency
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
2.64
3.3
3
2.7
2.4
2.1
1.8
1.5
1.2
0.9
0.6
0.3
0
Figure 34 — Load current vs. temperature (11mm heat sink)
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
25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105
Temp °C
Load Currrent (Amps)
Figure 32 — Load current vs. temperature (without heat sink)
3.3
3
2.7
2.4
2.1
1.8
1.5
1.2
0.9
0.6
0.3
0
Figure 35 — Start up, CREF = 0 (VIN = 16V, IOUT = 3.3A, CR,
COUT = 6 x 2.2µF X7R ceramic)
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
25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110
Temp °C
Figure 33 — Load current vs. temperature (6.33mm heat sink)
Figure 36 — Start up, CREF = 0 (VIN = 28V, IOUT = 3.3A, CR,
COUT = 6 x 2.2µF X7R ceramic)
28 Volt M-Grade
Rev 1.8
Page 21 of 26 09/2018
Not Recommended for New Designs PI31xx-00-HVMZ
PI3111-00-HVMZ Electrical Characteristics (Cont.)
Figure 37 — Start up, CREF = 0 (VIN = 50V, IOUT = 3.3A, CR,
COUT = 6 x 2.2µF X7R ceramic)
Figure 40 — Thermal image (VIN = 28V, IOUT = 3.33A, CR,
0LFM Evaluation PCB)
Figure 38 — Transient response (VIN = 28V, IOUT = 1.65 – 3.3A,
0.1A/µs, COUT = 6 x 2.2µF X7R ceramic)
Figure 39 — Output ripple (VIN = 28V, IOUT = 3.3A,
COUT = 6 x 2.2µF X7R ceramic)
28 Volt M-Grade
Rev 1.8
Page 22 of 26 09/2018
Not Recommended for New Designs PI31xx-00-HVMZ
Functional Description
DC-DC
Converter
MADE
IN
USA
U.S. PATS. LISTED ON PACKING MATERIALS & DATASHEETS
Figure 41 — PI31xx‑00‑HVMZ shown with system fuse,
filter, decoupling and extended soft start
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.
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.
ENABLE
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.
RHIGH
10kΩ
RREFI
VERO
TRIM/SS
VREF
RLOW
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.
SGND
RLOW = (–VDESIRED ) •
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.
PI31xx
RHIGH = (–RREFI ) •
(–V
RREFI
OUT_NOM
(–V
OUT_NOM
VREF
)+V
DESIRED
)•V
((–V
ERO
+ VDESIRED• VREF
)+V
OUT_NOM
Figure 42 — Trim equations and equivalent circuit
CREF =
28 Volt M-Grade
Rev 1.8
Page 23 of 26 09/2018
TSS_DESIRED – 230 • 10-6
23000
)
DESIRED
Not Recommended for New Designs 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 24 of 26 09/2018
Not Recommended for New Designs 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 25 of 26 09/2018
Not Recommended for New Designs PI31xx-00-HVMZ
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
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Specifications are subject to change without notice.
Visit http://www.vicorpower.com/pi31xx-isolated-regulated-dc-dc-converter for the latest product information.
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All sales are subject to Vicor’s Standard Terms and Conditions of Sale, and Product Warranty which are available on Vicor’s webpage
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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
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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
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Andover, MA, USA 01810
Tel: 800-735-6200
Fax: 978-475-6715
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email
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28 Volt M-Grade
Rev 1.8
Page 26 of 26 09/2018
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