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 are robust and effective input
and output filters which provide dramatically reduced
input and output noise performance when compared
to other manufacturers competing devices.
Operating at a nominal fixed frequency of 450 kHz,
these regulated, isolated units utilize a high speed
magnetic feedback design and 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 6 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 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
Space Applications should consider VPT’s “S”
Series of Radiation Tolerant Power Conversion
Devices. Contact VPT for details
Figure 1
– DVSA2800S DC-DC Converter
(Exact
marking may differ from that shown)
Sales Information:
Phone: (425) 353-3010
Fax: (425) 353-4030
E-mail: vptsales@vpt-inc.com
DVSA2800S-2.0
http://www.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)
ESD Rating per MIL-PRF-38534
50 V
DC
80 Volts
6 Watts
2.7 Watts
2
Junction Temperature Rise to Case
Storage Temperature
Lead Solder Temperature (10 seconds)
Weight (Maximum)
+10°C
-65°C to +150°C
270°C
15 Grams
Parameter
STATIC
INPUT
4
Voltage
Current
Ripple Current
Inhibit Pin Input
UVLO Turn On
UVLO Turn Off
OUTPUT
Voltage
Power
3
3
4
4
4
Conditions
DVSA283R3S
Min
15
-
-
-
-
0
9.0
12.0
11.0
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
-
-
Typ
28
-
4
45
25
-
11.0
-
-
3.30
3.30
-
-
10
2
20
65
-
-
-
450
-
457
Min
15
-
-
-
-
0
9.0
12.0
11.0
4.95
4.925
0
0
-
-
-
65
-
-
-
350
100
-
Typ
28
-
4
45
30
-
11.0
-
-
5.00
5.00
-
-
10
2
15
68
-
-
-
450
-
457
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
-
-
Units
Continuous
Transient, 1 sec
Inhibited
No Load
Full Load, 20Hz to 10MHz
V
V
mA
mA
mA
p-p
V
V
V
V
V
V
W
A
mV
p-p
mV
mV
%
W
W
F
kHz
MΩ
kHrs
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
-
-
-
-
-
-
200
450
250
600
10
0
300
700
500
1200
20
15
-
-
-
-
-
-
200
450
350
600
10
0
500
700
700
1200
20
25
mV
PK
Sec
mV
PK
Sec
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.
DVSA2800S-2.0
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)
ESD Rating per MIL-PRF-38534
50 V
DC
80 Volts
6 Watts
2.7 Watts
2
Junction Temperature Rise to Case
Storage Temperature
Lead Solder Temperature (10 seconds)
Weight (Maximum)
+10°C
-65°C to +150°C
270°C
15 Grams
Parameter
STATIC
INPUT
4
Voltage
Current
Ripple Current
Inhibit Pin Input
UVLO Turn On
UVLO Turn Off
OUTPUT
Voltage
Power
3
3
4
4
4
Conditions
DVSA2812S
Min
15
-
-
-
-
0
9.0
12.0
11.0
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
-
-
Typ
28
-
4
45
30
-
11.0
-
-
12.0
12.0
-
-
10
2
5
76
-
-
-
450
-
457
Min
15
-
-
-
-
0
9.0
12.0
11.0
14.85
14.775
0
0
-
-
-
72
-
-
-
350
100
-
Typ
28
-
4
45
30
-
11.0
-
-
15.0
15.0
-
-
10
2
5
78
-
-
-
450
-
457
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
-
-
Units
Continuous
Transient, 1 sec
Inhibited
No Load
Full Load, 20Hz to 10MHz
V
V
mA
mA
mA
p-p
V
V
V
V
V
V
W
A
mV
p-p
mV
mV
%
W
W
F
kHz
MΩ
kHrs
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
-
-
-
-
-
-
300
200
700
200
10
0
700
400
1300
600
20
50
mV
PK
Sec
mV
PK
Sec
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.
DVSA2800S-2.0
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)
ESD Rating per MIL-PRF-38534
50 V
DC
80 Volts
6 Watts
2.7 Watts
2
Junction Temperature Rise to Case
Storage Temperature
Lead Solder Temperature (10 seconds)
Weight (Maximum)
+10°C
-65°C to +150°C
270°C
15 Grams
Parameter
STATIC
INPUT
4
Voltage
Current
Ripple Current
Inhibit Pin Input
UVLO Turn On
UVLO Turn Off
OUTPUT
Voltage
Power
3
3
4
4
4
Conditions
DVSA285R2S
Min
15
-
-
-
-
0
9.0
12.0
11.0
Typ
28
-
4
45
30
-
11.0
-
-
5.20
5.20
-
-
10
2
15
68
-
-
-
450
-
457
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
-
-
Units
Continuous
Transient, 1 sec
Inhibited
No Load
Full Load, 20Hz to 10MHz
V
V
mA
mA
mA
p-p
V
V
V
V
V
V
W
A
mV
p-p
mV
mV
%
W
W
F
kHz
MΩ
kHrs
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
-
-
-
-
-
-
200
450
350
600
10
0
500
700
700
1200
20
25
mV
PK
Sec
mV
PK
Sec
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.
DVSA2800S-2.0
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
DVSA2800S-2.0
5
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