DVSB2800D Series
HIGH RELIABILITY HYBRID
DC-DC CONVERTERS
DESCRIPTION
The DVSB 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 DVSB 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
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High Reliability
Very Low Output Noise
Wide Input Voltage Range: 15 to 50 Volts per
MIL-STD-704
Up to 12.5 Watts Output Power
Fault Tolerant Magnetic Feedback Circuit
NO Use of Optoisolators
Undervoltage Lockout
Indefinite Short Circuit Protection
Current Limit Protection
High Input Transient Voltage: 80 Volts for 1 sec
per MIL-STD-704A
Precision Projection Welded Hermetic Package
High Power Density
Custom Versions Available
Additional Environmental Screening Available
Meets MIL-STD-461C and MIL-STD-461D EMC
Requirements When Used With a DVMH28 EMI
Filter
Flanged and Non-flanged Versions Available.
MIL-PRF-38534 Element Evaluated
Components
Figure 1
– DVSB2800D / DVSB2800DF DC-DC Converter
(Not
To Scale)
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
1X046DSD
1
DVSB2800D 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
Power Dissipation (Full Load, T
CASE
= +125°C)
Parameter
50 V
DC
80 Volts
12.5 Watts
6.0 Watts
Junction Temperature Rise to Case
Storage Temperature
Lead Solder Temperature (10 seconds)
Weight (Maximum) (Un-Flanged / Flanged)
DVSB2853R3D
Min
Typ
28
-
3.5
-
40
-
14
-
-
5.0
3.3
5.0
3.3
-
-
-
-
-
40
0
10
10
74
-
-
-
650
750
-
350
Max
50
80
5.0
60
60
1.5
17
14.5
13
5.05
3.333
5.075
3.35
12.5
7.5
5
1.5
1.5
60
25
50
50
-
11
12
500
700
800
-
-
V
V
mA
mA
mA
p-p
V
V
V
V
V
V
V
V
W
W
W
A
A
mV
p-p
mV
mV
mV
%
W
W
µF
kHz
kHz
MΩ
kHrs
Units
+15°C
-65°C to +150°C
270°C
(24 / 28) Grams
Conditions
STATIC
INPUT
4
Voltage
Current
Ripple Current
Inhibit Pin Input
UVLO Turn On
UVLO Turn Off
4
4
4
Continuous
Transient, 1 sec
Inhibited
No Load
Full Load, 20Hz to 10MHz
4
15
-
-
-
-
0
12
10.5
9
Inhibit Pin Open Circuit Voltage
V
OUT1
OUTPUT
Voltage
V
OUT2
V
OUT1
V
OUT2
Total
Power
3,4
T
CASE
= 25°C
T
CASE
= -55°C to +125°C
4.95
3.267
4.925
3.25
0
0
0
0
0
V
OUT1
V
OUT2
V
OUT1
V
OUT2
V
OUT1
V
OUT2
V
OUT1
V
OUT2
V
OUT1
V
OUT2
V
OUT1
V
OUT2
Full Load, 20Hz to 10MHz
V
IN
= 15V to 50V
No Load to Full Load
V
OUT1
= 0%, V
OUT2
= 100%
V
OUT1
= 100%, V
OUT2
= 0%
Full Load
Overload
4
Current
3
Ripple Voltage
Line Regulation
Load Regulation
Cross Regulation
EFFICIENCY
-
-
-
-
69
-
-
-
550
700
LOAD FAULT POWER DISSIPATION
CAPACITIVE LOAD
4
Short Circuit
Either Output
SWITCHING FREQUENCY
SYNCHRONIZATION FREQUENCY
ISOLATION
MTBF (MIL-HDBK-217F)
5
500 V
DC
, T
CASE
= 25°C
AIF @ T
C
= 55°C
100
-
1X046DSD
2
DVSB2800D 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
Power Dissipation (Full Load, T
CASE
= +125°C)
50 V
DC
80 Volts
12.5 Watts
6.0 Watts
Junction Temperature Rise to Case
Storage Temperature
Lead Solder Temperature (10 seconds)
Weight (Maximum) (Un-Flanged / Flanged)
DVSB2853R3D
Min
Typ
Max
+15°C
-65°C to +150°C
270°C
(24 / 28) Grams
Parameter
Conditions
Units
DYNAMIC
Load Step Output Transient
Load Step Recovery
2
V
OUT1
V
OUT2
V
OUT1
V
OUT2
V
OUT1
V
OUT2
V
OUT1
V
OUT2
V
OUT1
V
OUT2
V
IN
= 0V to 28V
V
IN
= 16V to 40V
Half Load to Full Load
-
-
-
-
-
-
-
200
450
100
300
-
-
-
400
700
400
600
20
25
15
mV
PK
µSec
mV
PK
µSec
mSec
mV
PK
mV
PK
Line Step Output Transient
Line Step Recovery
Turn On Delay
Turn On Overshoot
2, 4
4
Notes:
1.
2.
3.
4.
5.
This note intentionally not used.
Time for output voltage to settle within 1% of its nominal value.
Derate linearly to 0 at 135°C.
Verified by qualification testing.
Synchronization is TTL signal with V
SYNC MAX
= 6V.
1X046DSD
3
DVSB2800D Series
BLOCK DIAGRAM
28V IN
PIN 9
+VOUT1
PIN 2
IN COM
PIN 8
SYNC
PIN 7
PRIMARY
HOUSEKEEPING
SUPPLY
DUAL PWM
CONTROLLER
OUT COM
PIN 3
+VOUT2
PIN 4
TRANSFORMER
ISOLATED
ERROR SIGNAL
FEEDBACK
VOLTAGE
ERROR
AMPLIFIERS
INH
PIN 1
TRANSFORMER
ISOLATED
POWER
FEEDFORWARD
SECONDARY
HOUSKEEPING
SUPPLY
Figure 2
1X046DSD
4
DVSB2800D Series
CONNECTION DIAGRAM
9
2
LOAD
28V IN
+VOUT1
7
28 Vdc
SYNC
+VOUT2
4
+
-
1
LOAD
INH
3
8
IN COM OUT COM
Figure 3
INHIBIT DRIVE CONNECTION DIAGRAMS
28V IN 9
15K
INH
1
BIAS
OPTIONAL
CAPACITOR
IN COM 8
14V
OPTOISOLATOR
28V IN 9
15K
INH
1
BIAS
OPTIONAL
CAPACITOR
IN COM 8
14V
Figure 4
– Internal Inhibit Circuit and Recommended Drive
(Shown with optional capacitor for turn-on delay)
Figure 5
– Isolated Inhibit Drive
(Shown with optional capacitor for turn-on delay)
1X046DSD
5
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