DVSA2800S Series
HIGH RELIABILITY HYBRID
DC-DC CONVERTERS
DESCRIPTION
The DVSA 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 DVSA series is a magnetic feedback circuit
that is radiation immune. Operating at a nominal
fixed frequency of 450 kHz, 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 6 Watts Output Power
Radiation Immune 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
Radiation Hardened Version Available
Precision Projection Welded Hermetic Package
High Power Density: > 19 W/in
3
Custom Versions Available
Additional Environmental Screening Available
Meets MIL-STD-461C and MIL-STD-461D EMC
Requirements When Used With a DVMA28 EMI
Filter
MIL-PRF-38534 Element Evaluated
Components
Figure 1
– DVSA2800S DC-DC Converter
(Not
To Scale)
1X001DSF
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
DVSA2800S 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
6 Watts
2.7 Watts
Junction Temperature Rise to Case
Storage Temperature
Lead Solder Temperature (10 seconds)
Weight (Maximum)
DVSA283R3S
Min
STATIC
INPUT
4
Voltage
Current
Ripple Current
Inhibit Pin Input
UVLO Turn On
UVLO Turn Off
OUTPUT
Voltage
Power
3
3
4
4
4
+10°C
-65°C to +150°C
270°C
15 Grams
Parameter
Conditions
DVSA2805S
Max
50
80
6
60
50
1.5
13.0
14.8
14.5
3.333
3.35
4
1.21
30
15
50
-
3.3
3
1000
500
-
-
Units
Max
50
80
6
60
50
1.5
13.0
14.8
14.5
5.05
5.075
5
1.0
30
15
50
-
3.3
3
1000
500
-
-
V
V
mA
mA
mA
p-p
V
V
V
V
V
V
W
A
mV
p-p
mV
mV
%
W
W
µF
kHz
MΩ
kHrs
Typ
28
-
-
-
-
-
11.0
-
-
3.30
3.30
-
-
-
-
-
66
-
-
-
450
-
457
Min
15
-
-
-
-
0
9.0
12.0
11.0
4.95
4.925
0
0
-
-
-
65
-
-
-
350
100
-
Typ
28
-
-
-
-
-
11.0
-
-
5.00
5.00
-
-
-
-
-
70
-
-
-
450
-
457
Continuous
Transient, 1 sec
Inhibited
No Load
Full Load, 20Hz to 10MHz
15
-
-
-
-
0
9.0
12.0
11.0
Inhibit Pin Open Circuit Voltage
V
OUT
V
OUT
I
OUT
V
OUT
V
OUT
V
OUT
T
CASE
= 25°C
T
CASE
= -55°C to +125°C
3.267
3.25
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
-
-
-
62
-
-
-
350
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
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
450
250
600
10
0
300
700
500
1200
20
15
-
-
-
-
-
-
250
450
350
600
10
0
500
700
700
1200
20
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 135°C.
2. Time for output voltage to settle within 1% of its nominal value.
4. Verified by qualification testing.
1X001DSF
2
DVSA2800S 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
6 Watts
2.7 Watts
Junction Temperature Rise to Case
Storage Temperature
Lead Solder Temperature (10 seconds)
Weight (Maximum)
DVSA2812S
Min
STATIC
INPUT
4
Voltage
Current
Ripple Current
Inhibit Pin Input
UVLO Turn On
UVLO Turn Off
OUTPUT
Voltage
Power
3
3
4
4
4
+10°C
-65°C to +150°C
270°C
15 Grams
Parameter
Conditions
DVSA2815S
Max
50
80
6
60
50
1.5
13.0
14.8
14.5
12.12
12.18
6
0.5
30
15
50
-
3
3
500
500
-
-
Units
Max
50
80
6
60
50
1.5
13.0
14.8
14.5
15.15
15.225
6
0.4
30
15
50
-
3
3
500
500
-
-
V
V
mA
mA
mA
p-p
V
V
V
V
V
V
W
A
mV
p-p
mV
mV
%
W
W
µF
kHz
MΩ
kHrs
Typ
28
-
-
-
-
-
11.0
-
-
12.0
12.0
-
-
-
-
-
75
-
-
-
450
-
457
Min
15
-
-
-
-
0
9.0
12.0
11.0
14.85
14.775
0
0
-
-
-
72
-
-
-
350
100
-
Typ
28
-
-
-
-
-
11.0
-
-
15.0
15.0
-
-
-
-
-
76
-
-
-
450
-
457
Continuous
Transient, 1 sec
Inhibited
No Load
Full Load, 20Hz to 10MHz
15
-
-
-
-
0
9.0
12.0
11.0
Inhibit Pin Open Circuit Voltage
V
OUT
V
OUT
I
OUT
V
OUT
V
OUT
V
OUT
T
CASE
= 25°C
T
CASE
= -55°C to +125°C
11.88
11.82
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
-
-
-
71
-
-
-
350
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
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
-
-
-
-
-
-
300
200
700
200
10
0
700
400
1200
600
20
50
-
-
-
-
-
-
400
200
700
200
10
0
700
400
1300
600
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.
1X001DSF
3
DVSA2800S 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
6 Watts
2.7 Watts
Junction Temperature Rise to Case
Storage Temperature
Lead Solder Temperature (10 seconds)
Weight (Maximum)
DVSA285R2S
Min
STATIC
INPUT
4
Voltage
Current
Ripple Current
Inhibit Pin Input
UVLO Turn On
UVLO Turn Off
OUTPUT
Voltage
Power
3
3
4
4
4
+10°C
-65°C to +150°C
270°C
15 Grams
Parameter
Conditions
Units
Max
50
80
6
60
50
1.5
13.0
14.8
14.5
5.252
5.278
5.2
1.0
30
15
50
-
3.3
3
1000
500
-
-
V
V
mA
mA
mA
p-p
V
V
V
V
V
V
W
A
mV
p-p
mV
mV
%
W
W
µF
kHz
MΩ
kHrs
Typ
28
-
-
-
-
-
11.0
-
-
5.20
5.20
-
-
-
-
-
70
-
-
-
450
-
457
Continuous
Transient, 1 sec
Inhibited
No Load
Full Load, 20Hz to 10MHz
15
-
-
-
-
0
9.0
12.0
11.0
Inhibit Pin Open Circuit Voltage
V
OUT
V
OUT
I
OUT
V
OUT
V
OUT
V
OUT
T
CASE
= 25°C
T
CASE
= -55°C to +125°C
5.148
5.122
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
-
-
-
65
-
-
-
350
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
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
-
-
-
-
-
-
250
450
350
600
10
0
500
700
700
1200
20
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 135°C.
2. Time for output voltage to settle within 1% of its nominal value.
4. Verified by qualification testing.
1X001DSF
4
DVSA2800S Series
BLOCK DIAGRAM
PIN 6
28V IN
L1
C1
IN COM
PIN 7
Q1
MAGNETIC
FEEDBACK
Rs1
VOLTAGE AND
CURRENT
AMPLIFIERS
C2
Rs2
OUT COM
PIN 2
D1
PIN 1
+V OUT
T1
UNDER
VOLTAGE
SHUTDOWN
PRIMARY
HOUSEKEEPING
SUPPLY
INH
PIN 5
PWM
CONTROL
SECONDARY
HOUSEKEEPING
SUPPLY
Figure 2
CONNECTION DIAGRAM
6
28V IN
28 Vdc
5
INH
7
IN COM
OUT COM
+V OUT
1
LOAD
+
-
2
Figure 3
1X001DSF
5
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