SVHF2800S Series
HIGH RELIABILITY HYBRID
RADIATION TOLERANT DC-DC CONVERTERS
DESCRIPTION
The SVHF series of high reliability DC-DC converters is
operable over the full military (-55 °C to +125 °C)
temperature range with no power derating. Paramount to
the SVHF 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. The SVHF series has been
characterized and tested for TID (Total Ionizing Dose) at
HDR (High Dose Rate) and LDR (Low Dose Rate –
ELDRS) per VPT’s RHA plan. The SVHF series has also
been characterized for SEE (Single Event Effects). VPT's
certified radiation program per MIL-PRF-38534, Appendix
G is currently under review by DSCC. Please contact
DSCC at 614-692-0585 for details. This characterization
and testing is performed at the critical semiconductor
component piece-part level (RLAT) from traceable
semiconductor lots as well as on the SVHF series hybrid
converter level produced from the same traceable
semiconductor lots evaluated during RLAT.
These converters are designed and manufactured in a
facility qualified to ISO9001 and certified to MIL-PRF-
38534 Class H and Class K and MIL-STD-883.
This product may incorporate one or more of the following
U.S. patents:
5,784,266
6,005,780
5,790,389
6,084,792
5,963,438
6,118,673
5,999,433
•
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 20 Watts Output Power
Radiation Immune 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: > 37 W/in
3
Custom Modified Versions May Be 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
Utilized
Characterized and assured to 30krads(Si), per
VPT’s RHA plan specified per MIL-PRF-38534,
Appendix G, Level P with 2X margin. After radiation
exposure, converter testing is performed at 25°C per
standard datasheet limits.
Characterized to 44 MeV-cm2/mg with minor
transients only; no dropouts, shutdowns, latch up or
burn out.
Critical semiconductor component piece-parts and
assured converter products tested at an HDR of 80
rads(Si)/sec and an LDR of 8 mrads(Si)/sec.
•
Figure 1
– SVHF2800S / SVHF2800SF DC-DC Converter
(Exact
marking may differ from that shown)
DS2X004B
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
SVHF2800S 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
20 Watts
6 Watts
Junction Temperature Rise to Case
Storage Temperature
Lead Solder Temperature (10 seconds)
Weight
(Maximum)
(Un-Flanged / Flanged)
SVHF283R3S
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
+12°C
-65°C to +150°C
270°C
(24 / 27)
Grams
Parameter
Conditions
SVHF2805S
Max
50
80
6
65
80
1.5
13
14.8
14.5
3.333
3.35
10
3
40
20
50
-
8
8
1000
500
-
-
Units
Max
50
80
6
65
80
1.5
13
14.8
14.5
5.05
5.075
15
3
40
20
50
-
8
8
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
-
-
40
-
-
11
-
-
3.30
3.30
-
-
-
-
-
-
-
-
-
450
-
776
Min
15
-
-
-
-
0
9
12
11
4.95
4.925
0
0
-
-
-
72
-
-
-
350
100
-
Typ
28
-
-
40
-
-
11
-
-
5.00
5.00
-
-
-
-
-
-
-
-
-
450
-
776
Continuous
Transient, 1 sec
Inhibited
No Load
Full Load, 20Hz to 10MHz
15
-
-
-
-
0
9
12
11
Inhibit Pin Open Circuit Voltage
V
OUT
V
OUT
V
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
-
-
-
65
-
-
-
350
LOAD FAULT POWER DISSIPATION
CAPACITIVE LOAD
ISOLATION
MTBF (MIL-HDBK-217F)
4
Short Circuit
SWITCHING FREQUENCY
500 V
DC
SF @ 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
-
-
-
-
-
-
-
-
400
300
10
0
400
500
700
500
20
15
-
-
-
-
-
-
-
-
400
300
10
0
600
600
800
700
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.
DS2X004B
2
SVHF2800S 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
20 Watts
6 Watts
Junction Temperature Rise to Case
Storage Temperature
Lead Solder Temperature (10 seconds)
Weight
(Maximum)
(Un-Flanged / Flanged)
SVHF2812S
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
+12°C
-65°C to +150°C
270°C
(24 / 27)
Grams
Parameter
Conditions
SVHF2815S
Max
50
80
6
65
80
1.5
13
14.8
14.5
12.12
12.18
20
1.67
40
20
50
-
8
8
500
500
-
-
Units
Max
50
80
6
65
80
1.5
13
14.8
14.5
15.15
15.225
20
1.34
40
20
50
-
8
8
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
-
-
40
-
-
11
-
-
12.00
12.00
-
-
-
-
-
-
-
-
-
450
-
776
Min
15
-
-
-
-
0
9
12
11
14.85
14.775
0
0
-
-
-
78
-
-
-
350
100
-
Typ
28
-
-
40
-
-
11
-
-
15.00
15.00
-
-
-
-
-
-
-
-
-
450
-
776
Continuous
Transient, 1 sec
Inhibited
No Load
Full Load, 20Hz to 10MHz
15
-
-
-
-
0
9
12
11
Inhibit Pin Open Circuit Voltage
V
OUT
V
OUT
V
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
-
-
-
77
-
-
-
350
LOAD FAULT POWER DISSIPATION
CAPACITIVE LOAD
ISOLATION
MTBF (MIL-HDBK-217F)
4
Short Circuit
SWITCHING FREQUENCY
500 V
DC
SF @ 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
-
-
-
-
-
-
-
-
500
300
10
0
500
500
900
500
20
50
-
-
-
-
-
-
-
-
500
300
10
0
500
500
900
500
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.
DS2X004B
3
SVHF2800S 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
20 Watts
6 Watts
Junction Temperature Rise to Case
Storage Temperature
Lead Solder Temperature (10 seconds)
Weight
(Maximum)
(Un-Flanged / Flanged)
SVHF285R2S
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
+12°C
-65°C to +150°C
270°C
(24 / 27)
Grams
Parameter
Conditions
SVHF281R9S
Max
50
80
6
65
80
1.5
13
14.8
14.5
5.252
5.278
15
3
40
20
50
-
8
8
1000
500
-
-
Units
Max
50
80
6
65
80
1.5
13
14.8
14.5
1.93
1.94
8
4
40
20
65
-
8
8
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
-
-
40
-
-
11
-
-
5.20
5.20
-
-
-
-
-
-
-
-
-
450
-
776
Min
15
-
-
-
-
0
9
12
11
1.87
1.86
0
0
-
-
-
59
-
-
-
350
100
-
Typ
28
-
-
40
-
-
11
-
-
1.90
1.90
-
-
-
-
-
-
-
-
-
450
-
776
Continuous
Transient, 1 sec
Inhibited
No Load
Full Load, 20Hz to 10MHz
15
-
-
-
-
0
9
12
11
Inhibit Pin Open Circuit Voltage
V
OUT
V
OUT
V
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
-
-
-
72
-
-
-
350
LOAD FAULT POWER DISSIPATION
CAPACITIVE LOAD
ISOLATION
MTBF (MIL-HDBK-217F)
4
Short Circuit
SWITCHING FREQUENCY
500 V
DC
SF @ 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
-
-
-
-
-
-
-
-
400
300
10
0
600
600
800
700
20
25
-
-
-
-
-
-
-
-
100
200
10
0
250
600
400
700
20
15
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.
DS2X004B
4
SVHF2800S 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
20 Watts
6 Watts
Junction Temperature Rise to Case
Storage Temperature
Lead Solder Temperature (10 seconds)
Weight
(Maximum)
(Un-Flanged / Flanged)
SVHF2828S
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
+12°C
-65°C to +150°C
270°C
(24 / 27)
Grams
Parameter
Conditions
Units
Max
50
80
6
65
100
1.5
13
14.8
14.5
28.30
28.75
20
0.714
120
150
150
-
8
8
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
-
-
45
-
-
11
-
-
28.00
28.00
-
-
-
-
-
-
-
-
-
450
-
776
Continuous
Transient, 1 sec
Inhibited
No Load
Full Load, 20Hz to 10MHz
15
-
-
-
-
0
9
12
11
Inhibit Pin Open Circuit Voltage
V
OUT
V
OUT
V
OUT
V
OUT
V
OUT
V
OUT
T
CASE
= 25°C
T
CASE
= -55°C to +125°C
27.70
27.25
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
-
-
-
79
-
-
-
350
LOAD FAULT POWER DISSIPATION
CAPACITIVE LOAD
ISOLATION
MTBF (MIL-HDBK-217F)
4
Short Circuit
SWITCHING FREQUENCY
500 V
DC
SF @ 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
-
-
-
-
-
-
-
-
900
400
10
0
800
400
1200
700
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.
DS2X004B
5
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