DVWR2800T Series
1X049DSB
11314 4th Avenue
West, Suite 206
Everett, WA 90204
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
DESCRIPTION
The DVWR 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 DVWR series is a fault tolerant
magnetic feedback circuit. Operating at a nominal
fixed frequency of 325 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 25 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: > 28 W/in
3
Custom Versions Available
Additional Environmental Screening Available
Meets MIL-STD-461C and MIL-STD-461D EMC
Requirements When Used With a DVMC28 EMI
Filter
Flanged and Non-flanged Versions Available.
MIL-PRF-38534 Element Evaluated
Components
Figure 1
DVWR2800T DC-DC Converter
(Not To Scale)
DVWR2800T Series
1X049DSB
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
25 Watts
Lead Solder Temperature (10 seconds)
270C
Power Dissipation (Full Load, T
CASE
= +125C)
8 Watts
Weight (Maximum) (Un-Flanged / Flanged)
(50 / 56) Grams
DVWR283R312T DVWR283R315T
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 5 - 3.5 5 mA
Current
No
Load
- 20 40 - 20 40
mA
Ripple Current
Full Load
5
,
20Hz
to
10MHz
- 20 50 - 20 50
mA
p-p
Inhibit Pin Input
4
0 - 1.5 0 - 1.5
V
Inhibit Pin Open Circuit Voltage
4
13 15 17 13 15 17 V
UVLO Turn On
10.5
-
14.5
10.5
-
14.5
V
UVLO Turn Off
4
11.0 - 14.5
11.0 - 14.5 V
V
MAIN
3.25 3.30 3.35 3.25 3.30 3.35 V
+V
AUX
11.88 12.0 12.12 14.85 15.0 15.15 V
-V
AUX
T
CASE
= 25C
-12.24 -12.0 -11.76 -15.30 -15.0 -14.70 V
V
MAIN
3.20 3.30 3.40 3.20 3.30 3.40 V
+V
AUX
11.64 12.0 12.36 14.55 15.0 15.45 V
OUTPUT
Voltage
-V
AUX
T
CASE
= -55C to +125C
-12.48 -12.0 -11.52 -15.60 -15.0 -14.40 V
Total
0
-
25
0
-
25
W
V
MAIN
0 - 10 0 - 10
W
Power
4
V
AUX
6
0 - 15 0 - 15
W
V
MAIN
0 -
3.03
0 -
3.03
A
Current
3
V
AUX
Either Output
6
0 -
0.87
0 -
0.70
A
V
MAIN
- 20 60 - 20 60
mV
p-p
Ripple Voltage
V
AUX
Full Load
5
, 20Hz to 10MHz
- 40
100 - 40
100
mV
p-p
V
MAIN
- 10 25 - 10 25
mV
+V
AUX
- 15 50 - 15 50
mV
Line Regulation
-V
AUX
V
IN
= 15V to 50V
- 20
100 - 20
100
mV
V
MAIN
- 10 25 - 10 25
mV
+V
AUX
- 10 50 - 10 50
mV
Load Regulation
-V
AUX
No Load to Full Load
5,8
- 50
250 - 50
250
mV
Cross Regulation
V
AUX
+V
OUT
= 30%, -V
OUT
= 70%
+V
OUT
= 70%, -V
OUT
= 30%
- - 550 - - 550
mV
EFFICIENCY Full
Load
5
74 79 - 75 80 - %
Overload
4
- - 15 - - 15 W
LOAD FAULT POWER DISSIPATION
Short
Circuit
- - 10 - - 10 W
CAPACITIVE LOAD
4
- - 500 - - 500
F
SWITCHING
FREQUENCY
550 650 700 550 650 700 kHz
SYNCHRONIZATION FREQUENCY
7
700 750 800 700 750 800 kHz
ISOLATION 500
V
DC
, T
CASE
=
25C 100 - - 100 - - M
MTBF (MIL-HDBK-217F)
AIF @ T
C
=
55C
- 307 - - 307 - kHrs
DVWR2800T Series
1X049DSB
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
25 Watts
Lead Solder Temperature (10 seconds)
270C
Power Dissipation (Full Load, T
CASE
= +125C)
8 Watts
Weight (Maximum) (Un-Flanged / Flanged)
(50 / 56) Grams
DVWR283R312T DVWR283R315T
Parameter Conditions
Min Typ Max Min Typ Max
Units
DYNAMIC
V
MAIN
- 150
300 - 150
300
mV
PK
Load Step Output Transient
V
AUX
- 500
700 - 500
700
mV
PK
V
MAIN
- 200
400 - 200
400
Sec
Load Step Recovery
2
V
AUX
Half Load to Full Load
- 200
400 - 200
400
Sec
V
MAIN
- 80
200 - 80
200
mV
PK
Line Step Output Transient
4
V
AUX
- 300
500 - 300
500
mV
PK
V
MAIN
- 200
400 - 200
400
Sec
Line Step Recovery
2, 4
V
AUX
V
IN
= 15V to 50V
- 200
400 - 200
400
Sec
Turn On Delay
- - 20 - - 20
mSec
V
MAIN
- - 15 - - 15
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. 10W on V
MAIN
and 15W on V
AUX
.
6. Up to 70% of the total auxiliary power or current can be drawn from either of the auxiliary outputs.
7. Synchronization is TTL signal with V
SYNC MAX
= 6V.
8. -V
AUX
is 5% Load to Full Load at -55C.
DVWR2800T Series
1X049DSB
4
BLOCK DIAGRAM
PRIMARY
HOUSEKEEPING
SUPPLY
DUAL PWM
CONTROLLER
PIN 8
INH
TRANSFORMER
ISOLATED
POWER
FEEDFORWARD
TRANSFORMER
ISOLATED
ERROR SIGNAL
FEEDBACK
VOLTAGE AND
CURRENT ERROR
AMPLIFIERS
SECONDARY
HOUSKEEPING
SUPPLY
IN COM
PIN 10
28V IN
PIN 1
+V MAIN
PIN 2
OUT COM
PIN 3
+V AUX
PIN 5
-V AUX
PIN 4
SYNC
PIN 9
Figure 2
DVWR2800T Series
1X049DSB
5
CONNECTION DIAGRAM
10
IN COM
8
INH
1
28V IN
5
+V AUX
3
OUT COM
LOAD
+
-
28 Vdc
4
-V AUX
LOAD
SYNC
9
2
+V MAIN
LOAD
Figure 3
INHIBIT DRIVE CONNECTION DIAGRAMS
10
IN COM
8
INH
1
28V IN
OPTIONAL
CAPACITOR
BIAS
14V
15K
10
IN COM
8
INH
1
28V IN
OPTIONAL
CAPACITOR
BIAS
14V
15K
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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