VPT100+2800S Series
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,
current sharing capability, 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
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High Reliability at Low Cost
Parallel Up to 5 Units With Current Sharing
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% )
Fast Startup time with Soft Start
Current Limit Protection
Short Circuit Protection
Magnetic Feedback, no Optoisolators
Wide Temperature Range, -55°C to 100°C
Six Sided Metal Rugged 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)
DS90220B
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
VPT100+2800S Series
SPECIFICATIONS
(T
CASE
= -55°C to +100°C, V
IN
= +28V ± 5%, Full Load, Unless Otherwise Specified)
ABSOLUTE MAXIMUM RATINGS
Input Voltage (Continuous)
Input Voltage (Transient, 1 second)
Output Power
1
Power Dissipation (Full Load, T
CASE
= +100°C)
40 V
DC
50 Volts
100 Watts
18 Watts
Junction Temperature Rise to Case
Storage Temperature
Lead Solder Temperature (10 seconds)
Weight
(Maximum)
VPT100+283R3S
Min
16
-
-
-
-
0
4
+17°C
-55°C to +125°C
300°C
76 Grams
Parameter
STATIC
INPUT
4
Voltage
Current
Ripple Current
Inhibit Pin Input
UVLO Turn On
UVLO Turn Off
OUTPUT
Voltage
Power
3
3
4
4
Conditions
VPT100+2805S
Min
16
-
-
-
-
0
9.0
14.5
14.0
4.925
4.875
0
0
-
-
-
0
-
85
-
-
-
230
240
100
-
Typ
28
-
-
80
-
-
11.0
-
-
3.30
3.30
-
-
-
-
-
-
5
90
-
-
-
260
-
-
344
Max
40
50
5
150
180
1.5
14.0
15.8
15.0
3.35
3.383
66
20
150
20
50
5
-
-
24
24
1000
290
325
-
-
Typ
28
-
-
80
-
-
11.0
-
-
5.00
5.00
-
-
-
-
-
-
5
90
-
-
-
260
-
-
344
Max
40
50
5
150
200
1.5
14.0
15.8
15.0
5.075
5.125
100
20
150
20
50
5
-
-
24
24
1000
290
325
-
-
Units
Continuous
Transient, 1 sec
Inhibited
No Load
Full Load, 20Hz to 10MHz
V
V
mA
mA
mA
p-p
V
V
V
V
V
V
W
A
mV
p-p
mV
mV
V
%
%
W
W
μF
kHz
kHz
MΩ
kHrs
Inhibit Pin Open Circuit Voltage
9.0
14.5
14.0
V
OUT
V
OUT
V
OUT
V
OUT
V
OUT
V
OUT
4
4
T
CASE
= 25°C
T
CASE
= -55°C to +100°C
3.25
3.217
0
0
Current
Ripple Voltage
Line Regulation
Load Regulation
Share Pin Voltage
EFFICIENCY
Current Share Accuracy
Full Load, 20Hz to 10MHz
V
IN
= 16V to 40V
No Load to Full Load
-
-
-
0
-
85
LOAD FAULT POWER DISSIPATION
CAPACITIVE LOAD
4
Overload
4
-
-
-
230
Short Circuit
SWITCHING FREQUENCY
SYNC FREQUENCY RANGE
ISOLATION
MTBF (MIL-HDBK-217F)
V
H
-V
L
=5V
Duty Cycle = 50%
500 V
DC
GM @ T
C
= 55°C
V
OUT
V
OUT
V
OUT
240
100
-
DYNAMIC
Load Step Output Transient
Load Step Recovery
Line Step Recovery
Turn On Delay
Turn On Overshoot
2
4
Half Load to Full Load
V
IN
= 16V to 40V
V
IN
= 0V to 28V
-
-
-
-
-
-
-
-
-
-
4
0
250
300
300
150
10
15
-
-
-
-
-
-
-
-
-
-
4
0
250
300
300
150
10
25
mV
PK
μSec
mV
PK
μSec
mSec
mV
PK
Line Step Output Transient
2, 4
Notes:
1. Dependant on output voltage.
3. Derate linearly to 0 at 110°C.
2. Time for output voltage to settle within 1% of its nominal value.
4. Verified by qualification testing.
DS90220B
2
VPT100+2800S Series
SPECIFICATIONS
(T
CASE
= -55°C to +100°C, V
IN
= +28V ± 5%, Full Load, Unless Otherwise Specified)
ABSOLUTE MAXIMUM RATINGS
Input Voltage (Continuous)
Input Voltage (Transient, 1 second)
Output Power
1
Power Dissipation (Full Load, T
CASE
= +100°C)
40 V
DC
50 Volts
100 Watts
18 Watts
Junction Temperature Rise to Case
Storage Temperature
Lead Solder Temperature (10 seconds)
Weight
(Maximum)
VPT100+2807S
Min
16
-
-
-
-
0
4
+17°C
-55°C to +125°C
300°C
76 Grams
Parameter
STATIC
INPUT
4
Voltage
Current
Ripple Current
Inhibit Pin Input
UVLO Turn On
UVLO Turn Off
OUTPUT
Voltage
Power
3
3
4
4
Conditions
VPT100+2812S
Min
16
-
-
-
-
0
9.0
14.5
14.0
11.82
11.70
0
0
-
-
-
0
-
87
-
-
-
300
300
100
-
Typ
28
-
-
100
-
-
11.0
-
-
7.00
7.00
-
-
-
-
-
-
5
90
-
-
-
340
-
-
344
Max
40
50
5
200
200
1.5
14.0
15.8
15.0
7.105
7.175
100
14.28
150
20
70
5
-
-
24
24
1000
380
380
-
-
Typ
28
-
-
130
-
-
11.0
-
-
12.0
12.0
-
-
-
-
-
-
5
90
-
-
-
340
-
-
344
Max
40
50
5
200
200
1.5
14.0
15.8
15.0
12.18
12.30
100
8.33
150
50
100
5
-
-
24
24
500
380
380
-
-
Units
Continuous
Transient, 1 sec
Inhibited
No Load
Full Load, 20Hz to 10MHz
V
V
mA
mA
mA
p-p
V
V
V
V
V
V
W
A
mV
p-p
mV
mV
V
%
%
W
W
μF
kHz
kHz
MΩ
kHrs
Inhibit Pin Open Circuit Voltage
9.0
14.5
14.0
V
OUT
V
OUT
V
OUT
V
OUT
V
OUT
V
OUT
4
4
T
CASE
= 25°C
T
CASE
= -55°C to +100°C
6.895
6.825
0
0
Current
Ripple Voltage
Line Regulation
Load Regulation
Share Pin Voltage
EFFICIENCY
Current Share Accuracy
Full Load, 20Hz to 10MHz
V
IN
= 16V to 40V
No Load to Full Load
-
-
-
0
-
87
LOAD FAULT POWER DISSIPATION
CAPACITIVE LOAD
4
Overload
4
-
-
-
300
Short Circuit
SWITCHING FREQUENCY
SYNC FREQUENCY RANGE
ISOLATION
MTBF (MIL-HDBK-217F)
V
H
-V
L
=5V
Duty Cycle = 50%
500 V
DC
GM @ T
C
= 55°C
V
OUT
V
OUT
V
OUT
300
100
-
DYNAMIC
Load Step Output Transient
Load Step Recovery
Line Step Recovery
Turn On Delay
Turn On Overshoot
2
4
Half Load to Full Load
V
IN
= 16V to 40V
V
IN
= 0V to 28V
-
-
-
-
-
-
-
-
-
-
4
0
750
300
750
150
10
25
-
-
-
-
-
-
-
-
-
-
4
0
500
300
300
150
10
50
mV
PK
μSec
mV
PK
μSec
mSec
mV
PK
Line Step Output Transient
2, 4
Notes:
1. Dependant on output voltage.
3. Derate linearly to 0 at 110°C.
2. Time for output voltage to settle within 1% of its nominal value.
4. Verified by qualification testing.
DS90220B
3
VPT100+2800S Series
SPECIFICATIONS
(T
CASE
= -55°C to +100°C, V
IN
= +28V ± 5%, Full Load, Unless Otherwise Specified)
ABSOLUTE MAXIMUM RATINGS
Input Voltage (Continuous)
Input Voltage (Transient, 1 second)
Output Power
1
Power Dissipation (Full Load, T
CASE
= +100°C)
40 V
DC
50 Volts
100 Watts
18 Watts
Junction Temperature Rise to Case
Storage Temperature
Lead Solder Temperature (10 seconds)
Weight
(Maximum)
VPT100+2815S
Min
16
-
-
-
-
0
4
+17°C
-55°C to +125°C
300°C
76 Grams
Parameter
STATIC
INPUT
4
Voltage
Current
Ripple Current
Inhibit Pin Input
UVLO Turn On
UVLO Turn Off
OUTPUT
Voltage
Power
3
3
4
4
Conditions
VPT100+2828S
Min
16
-
-
-
-
0
9.0
14.5
14.0
27.44
27.16
0
0
-
-
-
0
-
85
-
-
-
300
300
100
-
Typ
28
-
-
130
-
-
11.0
-
-
15.0
15.0
-
-
-
-
-
-
5
91
-
-
-
340
-
-
344
Max
40
50
5
200
200
1.5
14.0
15.8
15.0
15.225
15.375
100
6.67
150
50
100
5
-
-
24
24
500
380
380
-
-
Typ
28
-
-
30
-
-
11.0
-
-
28.0
28.0
-
-
-
-
-
-
5
88
-
-
-
340
-
-
344
Max
40
50
5
100
200
1.5
14.0
15.8
15.0
28.56
28.84
100
3.57
300
50
100
5
-
-
24
28
500
380
380
-
-
Units
Continuous
Transient, 1 sec
Inhibited
No Load
Full Load, 20Hz to 10MHz
V
V
mA
mA
mA
p-p
V
V
V
V
V
V
W
A
mV
p-p
mV
mV
V
%
%
W
W
μF
kHz
kHz
MΩ
kHrs
Inhibit Pin Open Circuit Voltage
9.0
14.5
14.0
V
OUT
V
OUT
V
OUT
V
OUT
V
OUT
V
OUT
4
4
T
CASE
= 25°C
T
CASE
= -55°C to +100°C
14.775
14.625
0
0
Current
Ripple Voltage
Line Regulation
Load Regulation
Share Pin Voltage
EFFICIENCY
Current Share Accuracy
Full Load, 20Hz to 10MHz
V
IN
= 16V to 40V
No Load to Full Load
-
-
-
0
-
87
LOAD FAULT POWER DISSIPATION
CAPACITIVE LOAD
4
Overload
4
-
-
-
300
Short Circuit
SWITCHING FREQUENCY
SYNC FREQUENCY RANGE
ISOLATION
MTBF (MIL-HDBK-217F)
V
H
-V
L
=5V
Duty Cycle = 50%
500 V
DC
GM @ T
C
= 55°C
V
OUT
V
OUT
V
OUT
300
100
-
DYNAMIC
Load Step Output Transient
Load Step Recovery
Line Step Recovery
Turn On Delay
Turn On Overshoot
2
4
Half Load to Full Load
V
IN
= 16V to 40V
V
IN
= 0V to 28V
-
-
-
-
-
-
-
-
-
-
4
0
500
300
300
150
10
50
-
-
-
-
-
-
-
-
-
-
4
0
1400
300
1400
300
10
50
mV
PK
μSec
mV
PK
μSec
mSec
mV
PK
Line Step Output Transient
2, 4
Notes:
1. Dependant on output voltage.
3. Derate linearly to 0 at 110°C.
2. Time for output voltage to settle within 1% of its nominal value.
4. Verified by qualification testing.
DS90220B
4
VPT100+2800S Series
BLOCK DIAGRAM
PIN 1
28V IN
Current
Sense
T1
PIN 10
+V OUT
Q2
PIN 6
IN COM
PIN 5
UNDER
VOLTAGE
SHUTDOWN
Q1
Q3
OUT COM
PWM
CONTROL
PIN 4
SHARE
INH
SYNC
PIN 3
PIN 2
PRIMARY
HOUSEKEEPING
SUPPLY
MAGNETIC
FEEDBACK
VOLTAGE AND
CURRENT
AMPLIFIERS
PIN 8
PIN 9
PIN 7
TRIM
+S
-S
Note: Not applicable to VPT100+2828S
Figure 2
CONNECTION DIAGRAM
VPTF10-28 EMI FILTER
1
28V IN
28V OUT
5
VPT100+2800S DC-DC CONVERTER
1
10
28V IN
+V OUT
2
SYNC
28 Vdc
+S
TRIM
-S
OUT COM
8
7
6
IN COM
LOAD
4
3
4
2
IN COM
OUT COM
3
5
9
+
-
CASE
INH
SHARE
CASE
Figure 3
(Shown with optional EMI filter)
DS90220B
5
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