VPT100+2800D Series
VPT100+2800D-4.0
11314 4th Avenue
West, Suite 206
Everett, WA 98204
http://www.vpt-inc.com
Sales Information:
Phone: (425) 353-3010
Fax: (425) 353-4030
E-mail: vptsales@vpt-inc.com 1
HIGH RELIABILITY
COTS DC-DC CONVERTERS
DESCRIPTION
The VPT100 series of isolated COTS DC-DC
converters is a cost effective solution for many
demanding high reliability applications. A wide input
voltage range accommodates nominal 28V inputs
including avionics, mobile, ground systems, and
other applications. A high efficiency design reduces
input power requirements and eases thermal
management. Low input and output ripple, fixed
operating frequency, and companion EMI filters
simplify system design and compliance. A proven
design heritage, no optoisolators and a rugged all-
metal package ensure long term reliability.
The VPT100 series is intended for harsh
environments including severe vibration, shock and
temperature cycling. Testing is to JESD22, MIL-STD-
810, and MIL-STD-883.
These converters are designed and manufactured in
the USA in a facility certified to ISO9001, J-STD-001
and IPC-A-610.
This product may incorporate one or more of the
following U.S. patents:
5,784,266
5,790,389
5,963,438
5,999,433
6,005,780
6,084,792
6,118,673
FEATURES
High Reliability at Low Cost
Up to 100 Watts Maximum Output Power
High Efficiency, Up to 89%
Wide Input Voltage Range: 16 to 40 Volts per
MIL-STD-704 and MIL-STD-1275
High Input Transient Voltage: 50 Volts for 1 sec
Input Undervoltage Lockout
Fixed Frequency
Output Voltage Trim (+10% / -20% )
Output Soft Start
Current Limit Protection
Short Circuit Protection
Magnetic Feedback, no Optoisolators
Wide Temperature Range, -55°C to 100°C
Internally Conformal Coated
Six Sided Non-Hermetic Rugged Metal
Enclosure
Meets MIL-STD-461 Revisions C, D, E and F
EMC Requirements When Used With VPT’s
EMI Filters
Figure 1 – VPT100+2800D Converter
(Not To Scale)
VPT100+2800D Series
VPT100+2800D-4.0 2
SPECIFICATIONS (TCASE = -55°C to +100°C, VIN = +28V ± 5%, Full Load, Unless Otherwise Specified)
ABSOLUTE MAXIMUM RATINGS
Input Voltage (Continuous) 40 VDC Junction Temperature Rise to Case +17°C
Input Voltage (Transient, 1 second) 50 Volts Storage Temperature -55°C to +125°C
Output Power 100 Watts Lead Solder Temperature (10 seconds) 300°C
Power Dissipation (Full Load, TCASE = +100°C) 17 Watts Weight (Maximum) 76 Grams
VPT100+2812D VPT100+2815D
Parameter Conditions
Min Typ Max Min Typ Max
Units
STATIC
Continuous 16 28 40 16 28 40 V
INPUT
Voltage3 Transient, 1 sec - - 50 - - 50 V
Inhibited - - 5 - - 5 mA
Current
No Load - 50 100 - 50 100 mA
Ripple Current Full Load4, 20Hz to 10MHz - - 200 - - 200 mAp-p
Inhibit Pin Input3 0 - 1.5 0 - 1.5 V
Inhibit Pin Open Circuit Voltage3 9.0 12.0 14.0 9.0 12.0 14.0 V
UVLO Turn On 14.5 - 15.8 14.5 - 15.8 V
UVLO Turn Off3 14.0 - 15.0 14.0 - 15.0 V
+VOUT TCASE = 25°C 11.82 12.0 12.18 14.775 15.0 15.225 V
+VOUT TCASE = -55°C to +100°C 11.70 12.0 12.30 14.625 15.0 15.375 V
-VOUT TCASE = 25°C 11.70 12.0 12.30 14.625 15.0 15.375 V
OUTPUT
Voltage4
-VOUT TCASE = -55°C to +100°C 11.58 12.0 12.42 14.475 15.0 15.525 V
Total - - 100 - - 100 W
Power2,5 ±VOUT
Either Output - - 70 - - 70 W
Current2,5 ±VOUT Either Output - - 5.83 - - 4.66 A
Ripple Voltage ±VOUT Full Load4, 20Hz to 10MHz - - 100 - - 100 mVp-p
+VOUT VIN = 16V to 40V - - 20 - - 20 mV
Line Regulation -VOUT VIN = 16V to 40V - - 100 - - 100 mV
+VOUT No Load to Full Load4 - - 100 - - 100 mV
Load Regulation -VOUT No Load to Full Load4 - - 150 - - 150 mV
Cross Regulation -VOUT
+Load 70%, -Load 30%
+Load 30%, -Load 70% - - 450 - - 450 mV
EFFICIENCY Full Load4 86 88 - 87 89 - %
Overload3 - - 24 - - 24 W
LOAD FAULT POWER DISSIPATION Short Circuit - - 24 - - 24 W
CAPACITIVE LOAD3 Either Output - - 500 - - 500
F
SWITCHING FREQUENCY 300 - 380 300 - 380 kHz
SYNC FREQUENCY RANGE VH – VL = 5V, DC = 20-80% 300 - 380 300 - 380 kHz
ISOLATION 500 VDC, TCASE = 25°C 100 - - 100 - - MΩ
MTBF (MIL-HDBK-217F) GM @ TC = 55°C - 344 - - 344 - kHrs
See notes next page.
VPT100+2800D Series
VPT100+2800D-4.0 3
SPECIFICATIONS (TCASE = -55°C to +100°C, VIN = +28V ± 5%, Full Load, Unless Otherwise Specified)
ABSOLUTE MAXIMUM RATINGS
Input Voltage (Continuous) 40 VDC Junction Temperature Rise to Case +17°C
Input Voltage (Transient, 1 second) 50 Volts Storage Temperature -55°C to +125°C
Output Power 100 Watts Lead Solder Temperature (10 seconds) 300°C
Power Dissipation (Full Load, TCASE = +100°C) 17 Watts Weight (Maximum) 76 Grams
VPT100+2812D VPT100+2815D
Parameter Conditions
Min Typ Max Min Typ Max
Units
DYNAMIC
Load Step Output Transient ±VOUT - - 600 - - 600 mVPK
Load Step Recovery1 Half Load to Full Load - - 300 - - 300
Sec
Line Step Output Transient3 ±VOUT - - 900 - - 1200 mVPK
Line Step Recovery1,3 VIN = 16V to 40V - - 300 - - 300
Sec
Turn On Delay ±VOUT - 6 10 - 6 10 mSec
Turn On Overshoot VIN = 0V to 28V - 0 50 - 0 50 mVPK
Notes: 1. Time for output voltage to settle within 1% of its nominal value.
2. Derate linearly to 0 at 110°C.
3. Verified by qualification testing.
4. Half load at +VOUT and half load at –VOUT.
5. Up to 70% of the total power or current can be drawn from any one of the two outputs.
VPT100+2800D Series
VPT100+2800D-4.0 4
BLOCK DIAGRAM
UNDER
VOLTAGE
SHUTDOWN
PRIMARY
HOUSEKEEPING
SUPPLY
PWM
CONTROL
VOLTAGE AND
CURRENT
AMPLIFIERS
PIN 1
28V IN
PIN 5
IN COM
Q1
+V OUT
PIN 10
PIN 8
OUT COM
INH PIN 3 FEEDBACK
MAGNETIC
TRIM
PIN 9
-V OUT
PIN 6
Cur r ent
Sense
T1
SYNC PIN 2
Figure 2
CONNECTION DIAGRAM
VPT100+2800D DC-DC CONVERTER
+
-
28 Vdc
5
28V OUT
3
OUT COM
1
28V IN
CASE
5
IN COM
3
INH
1
28V IN
2
SYNC
VPTF10-28 EMI FILTER
2
IN COM
4
CASE
10
+V OUT
6
-V OUT
LOADTRIM
9
OUT COM
8
LOAD
Figure 3
VPT100+2800D Series
VPT100+2800D-4.0 5
CONNECTION DIAGRAMS
5IN COM
3INH
128V IN
OPTIONAL
CAPACITOR
BIAS
11.5V
10K
Figure 4 – Inhibit Circuit
+
-
+
-
0.75V Ri
10K
Rt
+V OUT
PIN 10
-V OUT
PIN 6
TRIM
PIN 9
OUT COM
PIN 8
(TRIM DOWN)
R-TRIM
(TRIM UP)
R-TRIM
(Shown with optional capacitor for turn-on delay) Figure 5 – Output Voltage Trim Circuit
OUTPUT VOLTAGE TRIM
The output voltage can be trimmed down by connecting a resistor between the TRIM pin and the +V OUT pin,
or can be trimmed up by connecting a resistor between the TRIM pin and the OUT COM pin as shown in
Figure 5. The maximum trim range is +10% up and –20% down. The appropriate resistor values versus the
output voltage are given in the trim table below.
VPT100+2812D VPT100+2815D
±VOUT (V) RTRIM (Ω) ±VOUT (V) RTRIM (Ω)
13.2 1.14k 16.50 686
13.0 2.39k 16.25 1.69k
12.8 4.26k 16.00 3.19k
12.6 7.39k 15.75 5.7k
12.4 13.6k 15.50 10.7k
12.2 32.4k 15.25 25.9k
12.0 -- 15.00 --
11.8 548k 14.75 551k
11.6 266k 14.50 270k
11.4 172k 14.25 175k
11.2 126k 14.00 128k
11.0 97.4k 13.75 99.5k
10.8 78.6k 13.50 80.6k
10.6 65.3k 13.25 67k
10.4 55.2k 13.00 56.9k
10.2 47.4k 12.75 49k
10.0 41.1k 12.50 42.6k
9.8 36k 12.25 37.5k
9.6 31.8k 12.00 33.2k
VPT100+2800D Series
VPT100+2800D-4.0 6
EFFICIENCY PERFORMANCE CURVES (TCASE = 25°C, Full Load, Unless Otherwise Specified)
V
IN = 16V VIN = 28V VIN = 40V
75
80
85
90
95
0 255075100
Output Power (W)
Efficiency (%)
75
80
85
90
95
0 255075100
Output Power (W)
Efficiency (%)
Figure 6 – VPT100+2812D Figure 7 – VPT100+2815D
Efficiency (%) vs. Output Power (W) Efficiency (%) vs. Output Power (W)
VPT100+2800D Series
VPT100+2800D-4.0 7
CROSS REGULATION CURVES (TCASE = 25°C, Full Load, Unless Otherwise Specified)
+Io = 10% +Io = 30% +Io = 50% +Io = 70%
-13.2
-13
-12.8
-12.6
-12.4
-12.2
-12
-11.8
-11.6
-11.4
0123456
-Io (A)
-Vo (V)
+Io=0.83A +Io=2.5A
+Io=4.17A +Io=5.83A
-16.2
-16
-15.8
-15.6
-15.4
-15.2
-15
-14.8
-14.6
-14.4
012345
-Io (A)
-Vo (V)
+Io=0.67A +Io=2A
+Io=3.33A +Io=4.67A
Figure 8 – VPT100+2812D Figure 9 – VPT100+2815D
-Vout (V) vs. -Iout (A) -Vout (V) vs. -Iout (A)
VPT100+2800D Series
VPT100+2800D-4.0 8
EMI PERFORMANCE CURVES
(TCASE = 25°C, VIN = +28V ± 5%, Full Load, Unless Otherwise Specified)
Emission Level [dBμA]
MIL-STD-461C CE03
Narrowband
80
60
40
20
0
0.01 0.1
Frequency [MHz]
1
Emission Level [dBμA]
MIL-STD-461C CE03
Narrowband
40
30
20
10
0
1 10 50
Frequency [MHz]
Figure 10 – VPT100+2800D without EMI Filter Figure 11 – VPT100+2800D with VPTF Series EMI Filter
Emission Level [dBμV]
MIL-STD-461E CE102
Narrowband
90
70
50
30
10
0.01 0.1
Frequency [MHz]
.25
Emission Level [dBμV]
MIL-STD-461E CE102
Narrowband
90
70
50
30
10
0.1 1 10
Frequency [MHz]
Figure 12 – VPT100+2800D without EMI Filter Figure 13 – VPT100+2800D with VPTF Series EMI Filter
VPT100+2800D Series
VPT100+2800D-4.0 9
PACKAGE SPECIFICATIONS
Top View Side View
Bottom View
Figure 14 – Package and Pinout
(Dimensional Limits are ±0.005” Unless Otherwise Stated)
Package Notes:
1. Case temperature is measured on the center of the baseplate surface.
2. Materials: Baseplate – aluminum, conductive conversion coating.
Cover – nickel plated.
Pins – copper, gold over nickel plating.
3. Mounting holes are not threaded. Recommended fastener is 4-40.
4. This Package is not hermetic. VPT offers a wide range of hermetic products. Please contact VPT for details if
hermetic products are required.
5. For applications requiring exposure to liquid cleaning, please contact VPT.
PIN FUNCTION
1 28V IN
2 SYNC
3 INHIBIT
4 CASE
5 IN COM
6 -VOUT
7 NC
8 OUTCOM
9 TRIM
10 +VOUT
VPT100+2800D Series
VPT100+2800D-4.0 10
PACKAGE PIN DESCRIPTION
Pin Function Description
1 28VIN Positive Input Voltage Connection
2 SYNC Input Synchronization Signal. TTL squarewave, 5Vpp, 20 - 80% duty cycle,
internally capacitively coupled.
3 INHIBIT
This is an open collector input. Logic Low = Disabled Output. Connect the inhibit
pin to input common to disable the output. Unconnected, open collector or open
drain = Enabled Output.
4 CASE Case Connection
5 INCOM Input Return Connection
6 -VOUT Negative Output Voltage Connection
7 NC No Connection.
8 OUTCOM Output Return Connection
9 TRIM Trim Output Voltage to +10%, -20% of Nominal Value. Leave open if not used.
10 +VOUT Positive Output Voltage Connection
100% ENVIRONMENTAL SCREENING
Screening Condition
Internal Visual IPC-A-610
Stabilization Bake MIL-STD-883, Method 1008, Condition B, 125°C, 24 hours
Temperature Cycling MIL-STD-883, Method 1010, Condition B, -55°C to +125°C, 10 Cycles
Burn-In 96 hours at +100°C
Final Electrical 100% at 25°C
External Visual MIL-STD-883, Method 2009
VPT100+2800D Series
VPT100+2800D-4.0 11
ORDERING INFORMATION
VPT100+ 28 12 D
1 2 3 4
(1) (2) (3) (4)
Product Series Nominal Input Voltage Output Voltage Number of Outputs
VPT100+
28
28 Volts
12
15
12 Volts
15 Volts
D
Dual
CONTACT INFORMATION
To request a quotation or place orders please contact your sales representative or the VPT Inc. Sales
Department at:
Phone: (425) 353-3010
Fax: (425) 353-4030
E-mail: vptsales@vpt-inc.com
All information contained in this datasheet is believed to be accurate, however, no responsibility is assumed for possible errors
or omissions. The products or specifications contained herein are subject to change without notice.
