VPT100-2800S Series
DS90210-2.0
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 using
synchronous rectification 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 91%
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-461C/D/E Conducted
Emissions Requirements When Used With a
VPTF series EMI Filter
Figure 1 – VPT100-2800S Converter
(Not to Scale)
VPT100-2800S Series
DS90210-2.0 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 Power1 100 Watts Lead Solder Temperature (10 seconds) 300°C
Power Dissipation (Full Load, TCASE = +100°C) 18 Watts Weight (Maximum) 90 Grams
Parameter Conditions
VPT100-283R3S VPT100-2805S
Units
Min Typ Max Min Typ Max
STATIC
INPUT
Voltage4
Continuous 16 28 40 16 28 40 V
Transient, 1 sec - - 50 - - 50 V
Current Inhibited - - 5 - - 5 mA
No Load - 130 200 - 130 200 mA
Ripple Current Full Load, 20Hz to 10MHz - - 180 - - 200 mAp-p
Inhibit Pin Input4 0 - 1.5 0 - 1.5 V
Inhibit Pin Open Circuit Voltage4 9.0 11.0 14.0 9.0 11.0 14.0 V
UVLO Turn On 14.5 - 15.8 14.5 - 15.8 V
UVLO Turn Off4 14.0 - 15.0 14.0 - 15.0 V
OUTPUT
Voltage
VOUT TCASE = 25°C 3.25 3.30 3.35 4.925 5.00 5.075 V
VOUT TCASE = -55°C to +100°C 3.217 3.30 3.383 4.875 5.00 5.125 V
Power3 0 - 66 0 - 100 W
Current3 VOUT 0 - 20 0 - 20 A
Ripple Voltage VOUT Full Load, 20Hz to 10MHz - - 150 - - 150 mVp-p
Line Regulation VOUT VIN = 16V to 40V - - 20 - - 20 mV
Load Regulation VOUT No Load to Full Load - - 50 - - 50 mV
EFFICIENCY 83 87 - 85 90 - %
LOAD FAULT POWER DISSIPATION Overload4 - - 24 - - 24 W
Short Circuit - - 24 - - 24 W
CAPACITIVE LOAD4 - - 1000 - - 1000
F
SWITCHING FREQUENCY 230 260 290 230 260 290 kHz
SYNC FREQUENCY RANGE VH-VL=5V 240 - 325 240 - 325 kHz
Duty Cycle = 50%
ISOLATION 500 VDC 100 - - 100 - - MΩ
MTBF (MIL-HDBK-217F) GM @ TC = 55°C - 344 - - 344 - kHrs
DYNAMIC
Load Step Output Transient VOUT Half Load to Full Load - - 250 - - 250 mVPK
Load Step Recovery2 - - 300 - - 300
Sec
Line Step Output Transient4 VOUT VIN = 16V to 40V - - 300 - - 300 mVPK
Line Step Recovery2, 4 - - 150 - - 150
Sec
Turn On Delay VOUT VIN = 0V to 28V - 6 10 - 6 10 mSec
Turn On Overshoot - 0 15 - 0 25 mVPK
Notes: 1. Dependant on output voltage. 2. Time for output voltage to settle within 1% of its nominal value.
3. Derate linearly to 0 at 110°C. 4. Verified by qualification testing.
VPT100-2800S Series
DS90210-2.0 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 Power1 100 Watts Lead Solder Temperature (10 seconds) 300°C
Power Dissipation (Full Load, TCASE = +100°C) 18 Watts Weight (Maximum) 90 Grams
Parameter Conditions
VPT100-2812S VPT100-2815S
Units
Min Typ Max Min Typ Max
STATIC
INPUT
Voltage4
Continuous 16 28 40 16 28 40 V
Transient, 1 sec - - 50 - - 50 V
Current Inhibited - - 5 - - 5 mA
No Load - 100 200 - 100 200 mA
Ripple Current Full Load, 20Hz to 10MHz - - 200 - - 200 mAp-p
Inhibit Pin Input4 0 - 1.5 0 - 1.5 V
Inhibit Pin Open Circuit Voltage4 9.0 11.0 14.0 9.0 11.0 14.0 V
UVLO Turn On 14.5 - 15.8 14.5 - 15.8 V
UVLO Turn Off4 14.0 - 15.0 14.0 - 15.0 V
OUTPUT
Voltage
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
Power3 0 - 100 0 - 100 W
Current3 VOUT 0 - 8.33 0 - 6.67 A
Ripple Voltage VOUT Full Load, 20Hz to 10MHz - - 150 - - 150 mVp-p
Line Regulation VOUT VIN = 16V to 40V - - 20 - - 20 mV
Load Regulation VOUT No Load to Full Load - - 100 - - 100 mV
EFFICIENCY 86 90 - 86 90 - %
LOAD FAULT POWER DISSIPATION Overload4 - - 24 - - 24 W
Short Circuit - - 24 - - 24 W
CAPACITIVE LOAD4 - - 500 - - 500
F
SWITCHING FREQUENCY 300 340 380 300 340 380 kHz
SYNC FREQUENCY RANGE VH-VL=5V 300 - 380 300 - 380 kHz
Duty Cycle = 50%
ISOLATION 500 VDC 100 - - 100 - - MΩ
MTBF (MIL-HDBK-217F) GM @ TC = 55°C - 344 - - 344 - kHrs
DYNAMIC
Load Step Output Transient VOUT Half Load to Full Load - - 500 - - 500 mVPK
Load Step Recovery2 - - 300 - - 300
Sec
Line Step Output Transient4 VOUT VIN = 16V to 40V - - 300 - - 300 mVPK
Line Step Recovery2, 4 - - 150 - - 150
Sec
Turn On Delay VOUT VIN = 0V to 28V - 6 10 - 6 10 mSec
Turn On Overshoot - 0 50 - 0 50 mVPK
Notes: 1. Dependant on output voltage. 2. Time for output voltage to settle within 1% of its nominal value.
3. Derate linearly to 0 at 110°C. 4. Verified by qualification testing.
VPT100-2800S Series
DS90210-2.0 4
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 Power1 100 Watts Lead Solder Temperature (10 seconds) 300°C
Power Dissipation (Full Load, TCASE = +100°C) 18 Watts Weight (Maximum) 90 Grams
Parameter Conditions
VPT100-2828S Units
Min Typ Max
STATIC
INPUT
Voltage4
Continuous 16 28 40 V
Transient, 1 sec - - 50 V
Current Inhibited - - 5 mA
No Load - 30 100 mA
Ripple Current Full Load, 20Hz to 10MHz - - 200 mAp-p
Inhibit Pin Input4 0 - 1.5 V
Inhibit Pin Open Circuit Voltage4 9.0 11.0 14.0 V
UVLO Turn On 14.5 - 15.8 V
UVLO Turn Off4 14.0 - 15.0 V
OUTPUT
Voltage
VOUT TCASE = 25°C 27.44 28.0 28.56 V
VOUT TCASE = -55°C to +100°C 27.16 28.0 28.84 V
Power3 0 - 100 W
Current3 VOUT 0 - 3.57 A
Ripple Voltage VOUT Full Load, 20Hz to 10MHz - - 250 mVp-p
Line Regulation VOUT VIN = 16V to 40V - - 50 mV
Load Regulation VOUT No Load to Full Load - - 50 mV
EFFICIENCY 85 87 - %
LOAD FAULT POWER DISSIPATION Overload4 - - 24 W
Short Circuit - - 28 W
CAPACITIVE LOAD4 - - 500
F
SWITCHING FREQUENCY 300 340 380 kHz
SYNC FREQUENCY RANGE VH-VL=5V 300 - 380 kHz
Duty Cycle = 50%
ISOLATION 500 VDC 100 - - MΩ
MTBF (MIL-HDBK-217F) GM @ TC = 55°C - 344 - kHrs
DYNAMIC
Load Step Output Transient VOUT Half Load to Full Load - - 1500 mVPK
Load Step Recovery2 - - 300
Sec
Line Step Output Transient4 VOUT VIN = 16V to 40V - - 1500 mVPK
Line Step Recovery2, 4 - - 300
Sec
Turn On Delay VOUT VIN = 0V to 28V - 6 10 mSec
Turn On Overshoot - 0 50 mVPK
Notes: 1. Dependant on output voltage. 2. Time for output voltage to settle within 1% of its nominal value.
3. Derate linearly to 0 at 110°C. 4. Verified by qualification testing.
VPT100-2800S Series
DS90210-2.0 5
BLOCK DIAGRAM
UNDER
VOLTAGE
S
H
U
TD
O
WN
PRIMARY
HOUSEKEEPING
SU
PPLY
PWM
CONTROL
VOLTAGE AND
CURRENT
AMPLIFIERS
PIN 1
28V IN
PIN 5
IN COM
Q1
+V OUT
PIN 10
PIN 6
OUT COM
INH PIN 3 FEEDBACK
MAGNETIC
TRIM
PIN 8
+S
PIN 9
-S
PIN 7
Q2
Q3
Current
Sense
T1
SYNC PIN 2
Note: Not applicable to VPT100-2828S
Figure 2
CONNECTION DIAGRAM
5
IN COM
3
INH
1
28V IN
10
+V OUT
6
OUT COM
LOAD
+
-
28 Vdc
-S
7
+S
9
TRIM
8
2
SYNC
VPT100-2800S DC-DC CONVERTER
Figure 3
VPT100-2800S Series
DS90210-2.0 6
CONNECTION DIAGRAMS
5IN COM
3INH
128V IN
OPTIONAL
CAPACITOR
BIAS
11.5V
10K
+
-
+
-
0.75V
Ri
30
10k
30
Rt
+V OUT
10
+S
9
TRIM
8
-S
7
OUT COM
6
(TRIM DOWN)
R-TRIM
(TRIM UP)
R-TRIM
Figure 4 –Inhibit Circuit
(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.
VPT100-283R3S VPT100-2805S VPT100-2812S VPT100-2815S VPT100-2828S
+VOUT (V) RTRIM (Ω) +VOUT (V) RTRIM (Ω) +VOUT (V) RTRIM (Ω) +VOUT (V) RTRIM (Ω) +VOUT (V) RTRIM (Ω)
3.60 3.94k 5.5 980 13.2 1.14k 16.50 686 30.5 720
3.55 8.92k 5.4 4.72k 13.0 2.39k 16.25 1.69k 30.0 1.46k
3.50 16.4k 5.3 10.9k 12.8 4.26k 16.00 3.19k 29.5 2.68k
3.45 28.8k 5.2 23.4k 12.6 7.39k 15.75 5.7k 29.0 5.12k
3.40 53.5k 5.1 60.5k 12.4 13.6k 15.50 10.7k 28.5 12.3k
3.35 127k 5.0 -- 12.2 32.4k 15.25 25.9k 28.0 --
3.30 -- 4.9 404k 12.0 -- 15.00 -- 27.5 551k
3.25 486k 4.8 189k 11.8 548k 14.75 552k 27.0 265k
3.20 226k 4.7 118k 11.6 266k 14.50 270k 26.5 171k
3.15 140k 4.6 82.4k 11.4 172k 14.25 175k 26.0 125k
3.10 96.9k 4.5 61.1k 11.2 126k 14.00 128k 25.5 97.4k
3.05 71.3k 4.4 46.9k 11.0 97.4k 13.75 99.5k 25.0 79k
3.00 54.2k 4.3 36.8k 10.8 78.6k 13.50 80.6k 24.5 65.9k
2.95 42k 4.2 29.2k 10.6 65.3k 13.25 67k 24.0 56.1k
2.90 32.8k 4.1 23.3k 10.4 55.2k 13.00 56.9k 23.5 48.5k
2.85 25.7k 4.0 18.5k 10.2 47.4k 12.75 49k 23.0 42.4k
2.80 20.1k 10.0 41.1k 12.50 42.6k 22.5 37.4k
2.75 15.4k 9.8 36k 12.25 37.5k
2.70 11.5k 9.6 31.8k 12.00 33.2k
2.65 8.26k
VPT100-2800S Series
DS90210-2.0 7
EFFICIENCY PERFORMANCE CURVES (TCASE = 25°C, Full Load, Unless Otherwise Specified)
V
IN = 16V VIN = 28V VIN = 40V
75
80
85
90
95
0224466
Output Pow er (W)
Efficiency (%)
75
80
85
90
95
0 25 50 75 100
Output Pow er (W)
Efficiency (%)
Figure 6 – VPT100-283R3S Figure 7 – VPT100-2805S
Efficiency (%) vs. Output Power (W) Efficiency (%) vs. Output Power (W)
75
80
85
90
95
0 25 50 75 100
Output Pow er (W)
Efficiency (%)
75
80
85
90
95
0 25 50 75 100
Output Pow er (W)
Efficiency (%)
Figure 8 – VPT100-2812S Figure 9 – VPT100-2815S
Efficiency (%) vs. Output Power (W) Efficiency (%) vs. Output Power (W)
VPT100-2800S Series
DS90210-2.0 8
EFFICIENCY PERFORMANCE CURVES (TCASE = 25°C, Full Load, Unless Otherwise Specified)
V
IN = 16V VIN = 28V VIN = 40V
75
80
85
90
95
10 35 60 85
Output Power (W)
Efficiency (%)
Figure 10 – VPT100-2828S
Efficiency (%) vs. Output Power (W)
VPT100-2800S Series
DS90210-2.0 9
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 11 – VPT100-2800S without EMI Filter Figure 12 – VPT100-2800S 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 13 – VPT100-2800S without EMI Filter Figure 14 – VPT100-2800S with VPTF Series EMI Filter
VPT100-2800S Series
DS90210-2.0 10
PACKAGE SPECIFICATIONS
Top View Side View
Bottom View
Figure 15 – 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 OUT COM
7 -SENSE
8 TRIM
9 +SENSE
10 +V OUT
VPT100-2800S Series
DS90210-2.0 11
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 OUTCOM Output Return Connection
7 -SENSE Output Return Remote Sense. Compensate for up to 0.5V total drop (positive and
return).
8 TRIM Trim Output Voltage to +10%, -20% of Nominal Value. Leave open if not used.
9 +SENSE Positive Output Voltage Remote Sense. Compensate for up to 0.5V total drop
(positive and return).
10 +V OUT 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 MIL-STD-883, Method 1015, 96 hours at +100°C
Final Electrical 100% at 25°C
External Visual MIL-STD-883, Method 2009
VPT100-2800S Series
DS90210-2.0 12
ORDERING INFORMATION
VPT100- 28 05 S
1 2 3 4
(1) (2) (3) (4)
Product Series Nominal Input Voltage Output Voltage Number of Outputs
VPT100-
28
28 Volts
3R3
05
12
15
28
3.3 Volts
5 Volts
12 Volts
15 Volts
28 Volts
S
Single
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.
