DVETR2800S Series
HIGH RELIABILITY HYBRID
DC-DC CONVERTERS
WITH INTEGRAL EMI FILTER
DESCRIPTION
The DVETR series of high reliability DC-DC
converters is operable over the full military (-55 °C to
+125 °C) temperature range with no power derating.
Unique to the DVETR series is a fault tolerant
magnetic feedback circuit. Operating at a nominal
fixed frequency of 500 kHz per stage, these
regulated, isolated units utilize well-controlled
undervoltage lockout circuitry to eliminate slow start-
up problems.
These converters are designed and manufactured in
a facility qualified to ISO9001 and certified to MIL-
PRF-38534 and MIL-STD-883.
FEATURES
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High Reliability
Very Low Output Noise
Wide Input Voltage Range: 15 to 50 Volts per
MIL-STD-704
Up to 40 Watts Output Power
Fault Tolerant Magnetic Feedback Circuit
NO Use of Optoisolators
Undervoltage Lockout
Indefinite Short Circuit Protection
Current Limit Protection
Industry Standard Pinout
High Input Transient Voltage: 80 Volts for 1 sec
per MIL-STD-704A
Precision Seam Welded or Solder Seal
Hermetic Package
High Power Density: > 30 W/in
3
Custom Versions Available
Additional Environmental Screening Available
No External EMI Filter Required
Meets MIL-STD-461C and MIL-STD-461D EMC
Requirements
Protects Against Conducted Susceptibility
Specified in MIL-STD-461C, CS01 and CS02
Flanged and Non-flanged Versions Available
MIL-PRF-38534 Element Evaluated
Components
Figure 1
– DVETR2800S / DVETR2800SF DC-DC Converter
(Not
To Scale)
12031DSD
17921 Bothell-Everett
Highway, Suite 108
Bothell, WA 98012
http://www.vpt-inc.com
Sales Information:
Phone: (425) 487-4850
Fax: (425) 487-4802
E-mail: sales@vpt-inc.com
1
DVETR2800S Series
SPECIFICATIONS
(T
CASE
= -55°C to +125°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
= +125°C)
50 V
DC
80 Volts
40 Watts
14 Watts
Junction Temperature Rise to Case
Storage Temperature
Lead Solder Temperature (10 seconds)
Weight (Maximum) (Un-Flanged / Flanged)
DVETR283R3S
Min
15
-
-
-
0
4
+15°C
-65°C to +150°C
270°C
(51 / 55) Grams
Parameter
STATIC
INPUT
4
Voltage
Current
Inhibit Pin Input
UVLO Turn On
UVLO Turn Off
OUTPUT
Voltage
Power
3
3
4
4
Conditions
DVETR2805S
Max
50
80
6
90
1.5
13.0
14.8
14.5
Typ
28
-
-
-
-
11.0
-
-
3.30
3.30
-
-
-
-
-
-
-
-
-
475
-
413
Min
15
-
-
-
0
9.0
12.0
11.0
4.95
4.90
0
0
-
-
-
70
-
-
-
450
100
-
Typ
28
-
-
-
-
11.0
-
-
5.00
5.00
-
-
-
-
-
-
-
-
-
500
-
413
Max
50
80
6
90
1.5
13.0
14.8
14.5
5.05
5.10
30
6.0
50
20
50
-
16
16
1000
550
-
-
Units
Continuous
Transient, 1 sec
Inhibited
No Load
V
V
mA
mA
V
V
V
V
V
V
W
A
mV
p-p
mV
mV
%
W
W
µF
kHz
MΩ
kHrs
Inhibit Pin Open Circuit Voltage
9.0
12.0
11.0
V
OUT
V
OUT
V
OUT
V
OUT
V
OUT
V
OUT
T
CASE
= 25°C
T
CASE
= -55°C to +125°C
3.267
3.25
0
0
3.333
3.35
20
6.06
50
20
50
-
16
16
1000
550
-
-
Current
Ripple Voltage
Line Regulation
Load Regulation
EFFICIENCY
Full Load, 20Hz to 10MHz
V
IN
= 15V to 50V
No Load to Full Load
Overload
4
-
-
-
65
-
-
-
400
LOAD FAULT POWER DISSIPATION
CAPACITIVE LOAD
ISOLATION
MTBF (MIL-HDBK-217F)
4
Short Circuit
SWITCHING FREQUENCY
500 V
DC
AIF @ T
C
= 55°C
V
OUT
V
OUT
V
OUT
2
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
-
-
-
-
-
-
-
-
150
100
-
-
400
500
600
500
20
30
-
-
-
-
-
-
-
-
150
100
-
-
500
500
600
500
20
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 135°C.
2. Time for output voltage to settle within 1% of its nominal value.
4. Verified by qualification testing.
12031DSD
2
DVETR2800S Series
SPECIFICATIONS
(T
CASE
= -55°C to +125°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
= +125°C)
50 V
DC
80 Volts
40 Watts
14 Watts
Junction Temperature Rise to Case
Storage Temperature
Lead Solder Temperature (10 seconds)
Weight (Maximum) (Un-Flanged / Flanged)
DVETR2812S
Min
15
-
-
-
0
4
+15°C
-65°C to +150°C
270°C
(51 / 55) Grams
Parameter
STATIC
INPUT
4
Voltage
Current
Inhibit Pin Input
UVLO Turn On
UVLO Turn Off
OUTPUT
Voltage
Power
3
3
4
4
Conditions
DVETR2815S
Max
50
80
6
90
1.5
13.0
14.8
14.5
12.12
12.18
40
3.33
50
20
50
-
14
14
500
550
-
-
Typ
28
-
-
-
-
11.0
-
-
12.0
12.0
-
-
-
-
-
-
-
-
-
475
-
413
Min
15
-
-
-
0
9.0
12.0
11.0
14.85
14.775
0
0
-
-
-
75
-
-
-
400
100
-
Typ
28
-
-
-
-
11.0
-
-
15.0
15.0
-
-
-
-
-
-
-
-
-
475
-
413
Max
50
80
6
90
1.5
13.0
14.8
14.5
15.15
15.225
40
2.67
50
20
50
-
14
14
500
550
-
-
Units
Continuous
Transient, 1 sec
Inhibited
No Load
V
V
mA
mA
V
V
V
V
V
V
W
A
mV
p-p
mV
mV
%
W
W
µF
kHz
MΩ
kHrs
Inhibit Pin Open Circuit Voltage
9.0
12.0
11.0
V
OUT
V
OUT
V
OUT
V
OUT
V
OUT
V
OUT
T
CASE
= 25°C
T
CASE
= -55°C to +125°C
11.88
11.72
0
0
Current
Ripple Voltage
Line Regulation
Load Regulation
EFFICIENCY
Full Load, 20Hz to 10MHz
V
IN
= 15V to 50V
No Load to Full Load
Overload
4
-
-
-
74
-
-
-
400
LOAD FAULT POWER DISSIPATION
CAPACITIVE LOAD
ISOLATION
MTBF (MIL-HDBK-217F)
4
Short Circuit
SWITCHING FREQUENCY
500 V
DC
AIF @ T
C
= 55°C
V
OUT
V
OUT
V
OUT
2
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
-
-
-
-
-
-
-
-
800
300
-
-
700
500
1200
500
20
50
-
-
-
-
-
-
-
-
800
300
-
-
800
500
1200
500
20
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 135°C.
2. Time for output voltage to settle within 1% of its nominal value.
4. Verified by qualification testing.
12031DSD
3
DVETR2800S Series
SPECIFICATIONS
(T
CASE
= -55°C to +125°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
= +125°C)
50 V
DC
80 Volts
40 Watts
14 Watts
Junction Temperature Rise to Case
Storage Temperature
Lead Solder Temperature (10 seconds)
Weight (Maximum) (Un-Flanged / Flanged)
DVETR285R2S
Min
15
-
-
-
0
4
+15°C
-65°C to +150°C
270°C
(51 / 55) Grams
Parameter
STATIC
INPUT
4
Voltage
Current
Inhibit Pin Input
UVLO Turn On
UVLO Turn Off
OUTPUT
Voltage
Power
3
3
4
4
Conditions
Typ
28
-
-
-
-
11.0
-
-
5.20
5.20
-
-
-
-
-
-
-
-
-
500
-
413
Max
50
80
6
90
1.5
13.0
14.8
14.5
5.26
5.31
30
6.0
50
20
50
-
16
16
1000
550
-
-
Units
Continuous
Transient, 1 sec
Inhibited
No Load
V
V
mA
mA
V
V
V
V
V
V
W
A
mV
p-p
mV
mV
%
W
W
µF
kHz
MΩ
kHrs
Inhibit Pin Open Circuit Voltage
9.0
12.0
11.0
V
OUT
V
OUT
V
OUT
V
OUT
V
OUT
V
OUT
T
CASE
= 25°C
T
CASE
= -55°C to +125°C
5.14
5.09
0
0
Current
Ripple Voltage
Line Regulation
Load Regulation
EFFICIENCY
Full Load, 20Hz to 10MHz
V
IN
= 15V to 50V
No Load to Full Load
Overload
4
-
-
-
70
-
-
-
400
LOAD FAULT POWER DISSIPATION
CAPACITIVE LOAD
ISOLATION
MTBF (MIL-HDBK-217F)
4
Short Circuit
SWITCHING FREQUENCY
500 V
DC
AIF @ T
C
= 55°C
V
OUT
V
OUT
V
OUT
2
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
-
-
-
-
-
-
-
-
150
100
-
-
500
500
600
500
20
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 135°C.
2. Time for output voltage to settle within 1% of its nominal value.
4. Verified by qualification testing.
12031DSD
4
DVETR2800S Series
BLOCK DIAGRAM
PIN 1
28V IN
EMI
FILTER
IN COM
PIN 10
Q1
MAGNETIC
FEEDBACK
VOLTAGE AND
CURRENT
AMPLIFIERS
-S
PIN 3
+S
PIN 6
C2
Rs2
OUT COM
PIN 4
T1
D1
PIN 5
+V OUT
UNDER
VOLTAGE
SHUTDOWN
Rs1
PRIMARY
HOUSEKEEPING
SUPPLY
INH
PIN 2
PWM
CONTROL
SECONDARY
HOUSEKEEPING
SUPPLY
Figure 2
12031DSD
5
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