DVEHF2800T Series
1X030DSD
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 HYBRID
DC-DC CONVERTERS
WITH INTEGRAL EMI FILTER
DESCRIPTION
The DVEHF 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 DVEHF series is a fault tolerant
magnetic feedback circuit. Operating at a nominal
fixed frequency of 450 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.
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
Very Low Output Noise
Wide Input Voltage Range: 15 to 50 Volts per
MIL-STD-704
Up to 10 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
Solder Seal Hermetic Package
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, SC01 and CS02
Non-flanged Version Available
MIL-PRF-38534 Element Evaluated
Components
Figure 1
DVEHF2800T DC-DC Converter
(Not To Scale)
DVEHF2800T Series
1X030DSD
2
SPECIFICATIONS
(T
CASE
= -55C to +125C, V
IN
= +28V 5%, Full Load
5
, Unless Otherwise Specified)
ABSOLUTE MAXIMUM RATINGS
Input Voltage (Continuous)
50 V
DC
Junction Temperature Rise to Case
+15C
Input Voltage (Transient, 1 second)
80 Volts
Storage Temperature
-65C to +150C
Output Power
10 Watts
Lead Solder Temperature (10 seconds)
270C
Power Dissipation (Full Load, T
CASE
= +125C)
5.0 Watts
Weight (Maximum)
50 Grams
DVEHF28512T DVEHF28515T
Parameter Conditions
Min Typ Max Min Typ Max
Units
STATIC
Continuous
15 28 50 15 28 50 V
INPUT
Voltage
Transient, 1 sec
4
- - 80 - - 80 V
Inhibited
- 3.5 6.0 - 3.5 6.0
mA
Current
No
Load
- - 70 - - 70
mA
Inhibit Pin Input
4
0 - 1.5 0 - 1.5
V
Inhibit Pin Open Circuit Voltage
4
9.0 11.0 13.0 9.0 11.0 13.0 V
UVLO Turn On
8.0
-
12.0
8.0
-
12.0
V
UVLO Turn Off
4
4.0 - 8.0 4.0 - 8.0 V
V
MAIN
4.95 5.0 5.05 4.95 5.0 5.05 V
V
AUX
T
CASE
= 25C
11.88 12.0 12.12 14.85 15.0 15.15 V
V
MAIN
4.925 5.0 5.075 4.925 5.0 5.075 V
OUTPUT
Voltage
V
AUX
T
CASE
= -55C to +125C
11.4 12.0 12.6 14.25 15.0 15.75 V
Total
0
-
10
0
-
10
W
V
MAIN
0.15 - 5.0 0.15 - 5.0 W
Power
4
V
AUX
6
Either Output
0 - 3.5 0 - 3.5
W
V
MAIN
0 - 1.0 0 - 1.0
A
Current
3
V
AUX
Either Output
6
0 -
0.29
0 -
0.23
A
V
MAIN
- 15 50 - 15 50
mV
p-p
Ripple Voltage
V
AUX
Full Load
5
, 20Hz to 10MHz
- 15 50 - 15 50
mV
p-p
V
MAIN
- 10 20 - 10 20
mV
Line Regulation
V
AUX
V
IN
= 15V to 50V
- 15 50 - 15 50
mV
V
MAIN
- 5 20 - 5 20 mV
Load Regulation
V
AUX
No Load to Full Load
5
- 10 50 - 10 50
mV
Cross Regulation
V
AUX
+V
OUT
= 30%, -V
OUT
= 70%
+V
OUT
= 70%, -V
OUT
= 30%
- - 50 - - 50
mV
EFFICIENCY Full
Load
5
67 72 - 67 72 - %
Overload
4
- - 7.5 - - 7.5
W
LOAD FAULT POWER DISSIPATION
Short
Circuit
- - 7.5 - - 7.5
W
CAPACITIVE LOAD
4
- - 500 - - 500
F
SWITCHING
FREQUENCY
350 450 550 350 450 550 kHz
ISOLATION 500
V
DC
, T
CASE
=
25C 100 - - 100 - - M
MTBF (MIL-HDBK-217F)
AIF @ T
C
=
55C
- 350 - - 350 - kHrs
DVEHF2800T Series
1X030DSD
3
SPECIFICATIONS
(T
CASE
= -55C to +125C, V
IN
= +28V 5%, Full Load
5
, Unless Otherwise Specified)
ABSOLUTE MAXIMUM RATINGS
Input Voltage (Continuous)
50 V
DC
Junction Temperature Rise to Case
+15C
Input Voltage (Transient, 1 second)
80 Volts
Storage Temperature
-65C to +150C
Output Power
10 Watts
Lead Solder Temperature (10 seconds)
270C
Power Dissipation (Full Load, T
CASE
= +125C)
5.0 Watts
Weight (Maximum)
50 Grams
DVEHF28512T DVEHF28515T
Parameter Conditions
Min Typ Max Min Typ Max
Units
DYNAMIC
V
MAIN
- 200
500 - 200
500
mV
PK
Load Step Output Transient
V
AUX
- 100
400 - 100
400
mV
PK
V
MAIN
- 200
500 - 200
500
Sec
Load Step Recovery
2
V
AUX
Half Load to Full Load
- 200
500 - 200
500
Sec
V
MAIN
- 200
600 - 200
600
mV
PK
Line Step Output Transient
4
V
AUX
- 50
100 - 50
100
mV
PK
V
MAIN
- 200
500 - 200
500
Sec
Line Step Recovery
2, 4
V
AUX
V
IN
= 16V to 40V
- 200
500 - 200
500
Sec
Turn On Delay
- 20 30 - 20 30
mSec
V
MAIN
- - 25 - - 25
mV
PK
Turn On Overshoot
V
AUX
V
IN
= 0V to 28V
- - 50 - - 50
mV
PK
Notes: 1. This note intentionally not used.
2. Time for output voltage to settle within 1% of its nominal value.
3. Derate linearly to 0 at 135C.
4. Verified by qualification testing.
5. 5.0W on V
MAIN
and 2.5W on V
AUX
.
6. Up to 70% of the total auxiliary power or current can be drawn from either of the auxiliary outputs.
DVEHF2800T Series
1X030DSD
4
BLOCK DIAGRAM
PRIMARY
HOUSEKEEPING
SUPPLY
PWM
CONTROLLER
PIN 2
INH
TRANSFORMER
ISOLATED
SIGNAL
FEEDBACK
POWER
FEEDFORWARD
VOLTAGE
ERROR
AMPLIFIERS
SECONDARY
HOUSKEEPING
SUPPLY
IN COM
PIN 10
28V IN
PIN 1
+V MAIN
PIN 7
MAIN COM
PIN 6
+V AUX
PIN 3
-V AUX
PIN 5
EMI
FILTER
LINEAR
REG
LINEAR
REG
AUX COM
PIN 4
Figure 2
DVEHF2800T Series
1X030DSD
5
CONNECTION DIAGRAM
10
IN COM
2
INH
1
28V IN
3
+V AUX
6
MAIN COM
LOAD
+
-
28 Vdc
5
-V AUX
LOAD
AUX COM
4
7
+V MAIN
LOAD
Figure 3
INHIBIT DRIVE CONNECTION DIAGRAMS
10
IN COM
2
INH
1
28V IN
OPTIONAL
CAPACITOR
BIAS
12V
10K
10
IN COM
2
INH
1
28V IN
OPTIONAL
CAPACITOR
BIAS
12V
10K
OPTOISOLATOR
Figure 4
Internal Inhibit Circuit and Recommended Drive
Figure 5
Isolated Inhibit Drive
(Shown with optional capacitor for turn-on delay)
(Shown with optional capacitor for turn-on delay)
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