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 temperature range (-55 °C to
+125 °C) 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 is specifically designed for the harsh
radiation environment of space applications. Performance
is guaranteed through the use of hardened semiconductor
components, radiation lot acceptance testing (RLAT) of
non-hardened components and analysis. The SVHF
series has been characterized for Total Ionizing Dose
(TID) performance including Enhanced Low Dose Rate
Sensitivity (ELDRS) and for Single Event Effects (SEE)
according to VPT’s DLA approved Radiation Hardness
Assurance (RHA) plan per MIL-PRF-38534, Appendix G.
Characterization is performed at both the component level
and at the SVHF series hybrid converter level.
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
Guaranteed TID Performance to 30 krad(Si)
including ELDRS, per VPT’s RHA plan specified per
MIL-PRF-38534, Appendix G, Level P with 2X
margin.
Characterized to 44 MeV-cm
2
/mg with minor
transients only; no dropouts, shutdowns, latch up or
burn out.
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
Current Limit and Short Circuit 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-461 Revisions C, D, E and F EMC
Requirements When Used With VPT’s EMI Filters
Flanged and Non-flanged Versions Available
MIL-PRF-38534 Element Evaluated Components
Worst Case analysis, Stress, Radiation, and
Reliability reports available
1
Figure 1
– SVHF2800S / SVHF2800SF DC-DC Converter
(Exact
marking may differ from that shown)
Subject to all export restrictions and export regulations including but not limited to the Export Administration and Foreign Assets Control Regulations.
Further restrictions may apply contact VPT for details.
Sales Information:
Phone: (425) 353-3010
Fax: (425) 353-4030
E-mail: vptsales@vpt-inc.com
1
SVHF2800S-3.0
http://www.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)
ESD Rating per MIL-PRF-38534
50 V
DC
80 Volts
20 Watts
6 Watts
2
Junction Temperature Rise to Case
Storage Temperature
Lead Solder Temperature (10 seconds)
Weight
(Maximum)
(Un-Flanged / Flanged)
+12°C
-65°C to +150°C
270°C
(24 / 28)
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
5
SVHF282R5S
Min
15
-
-
-
-
-
0
9
12
11
SVHF283R3S
Max
50
80
6
65
80
110
1.5
13
14.8
14.5
2.525
2.538
2.538
8
3.2
40
20
50
-
8
8
1000
500
-
-
Typ
28
-
4
45
25
-
-
11
-
-
2.50
2.50
-
-
-
10
2
20
64
-
-
-
450
-
776
Min
15
-
-
-
-
-
0
9
12
11
3.267
3.25
3.244
0
0
-
-
-
65
-
-
-
350
100
-
Typ
28
-
4
45
25
-
-
11
-
-
3.30
3.30
-
-
-
10
2
20
71
-
-
-
450
-
776
Max
50
80
6
65
80
110
1.5
13
14.8
14.5
3.333
3.35
3.35
10
3
40
20
50
-
8
8
1000
500
-
-
Units
Continuous
Transient, 1 sec
Inhibited
No Load
Full Load, 20Hz to 10MHz
End-of-Life
V
V
mA
mA
mA
p-p
mA
p-p
V
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
V
OUT
V
OUT
V
OUT
V
OUT
V
OUT
T
CASE
= 25°C
T
CASE
= -55°C to +125°C
End-of-Life
2.475
2.463
2.463
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
-
-
-
57
-
-
-
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
-
-
-
-
-
-
140
400
400
300
10
0
250
600
700
500
20
15
-
-
-
-
-
-
160
350
400
300
10
0
400
500
700
500
20
15
mV
PK
Sec
mV
PK
Sec
mSec
mV
PK
Line Step Output Transient
2, 4
Notes:
1. Dependant on output voltage.
2. Time for output voltage to settle within 1% of its nominal value.
3. Derate linearly to 0 at 135°C.
4. Verified by qualification testing.
5. End-of-Life performance includes aging and radiation degradation and is within standard limits except where noted.
SVHF2800S-3.0
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)
ESD Rating per MIL-PRF-38534
50 V
DC
80 Volts
20 Watts
6 Watts
2
Junction Temperature Rise to Case
Storage Temperature
Lead Solder Temperature (10 seconds)
Weight
(Maximum)
(Un-Flanged / Flanged)
+12°C
-65°C to +150°C
270°C
(24 / 28)
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
5
SVHF2805S
Min
15
-
-
-
-
-
0
9
12
11
SVHF2812S
Max
50
80
6
65
80
110
1.5
13
14.8
14.5
5.05
5.075
5.10
15
3
40
20
50
-
8
8
1000
500
-
-
Typ
28
-
4
45
30
-
-
11
-
-
5.00
5.00
-
-
-
15
2
25
77
-
-
-
450
-
776
Min
15
-
-
-
-
-
0
9
12
11
11.88
11.82
11.66
0
0
-
-
-
77
-
-
-
350
100
-
Typ
28
-
4
45
40
-
-
11
-
-
12.00
12.00
-
-
-
10
2
10
84
-
-
-
450
-
776
Max
50
80
6
65
80
110
1.5
13
14.8
14.5
12.12
12.18
12.30
20
1.67
40
20
50
-
8
8
500
500
-
-
Units
Continuous
Transient, 1 sec
Inhibited
No Load
Full Load, 20Hz to 10MHz
End-of-Life
V
V
mA
mA
mA
p-p
mA
p-p
V
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
V
OUT
V
OUT
V
OUT
V
OUT
V
OUT
T
CASE
= 25°C
T
CASE
= -55°C to +125°C
End-of-Life
4.95
4.925
4.89
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
-
-
-
-
-
-
250
450
400
300
10
0
600
600
800
700
20
25
-
-
-
-
-
-
350
250
500
300
10
0
500
500
900
500
20
50
mV
PK
Sec
mV
PK
Sec
mSec
mV
PK
Line Step Output Transient
2, 4
Notes:
1. Dependant on output voltage.
2. Time for output voltage to settle within 1% of its nominal value.
3. Derate linearly to 0 at 135°C.
4. Verified by qualification testing.
5. End-of-Life performance includes aging and radiation degradation and is within standard limits except where noted.
SVHF2800S-3.0
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)
ESD Rating per MIL-PRF-38534
50 V
DC
80 Volts
20 Watts
6 Watts
2
Junction Temperature Rise to Case
Storage Temperature
Lead Solder Temperature (10 seconds)
Weight
(Maximum)
(Un-Flanged / Flanged)
+12°C
-65°C to +150°C
270°C
(24 / 28)
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
5
SVHF2815S
Min
15
-
-
-
-
-
0
9
12
11
Typ
28
-
4
45
40
-
-
11
-
-
15.00
15.00
-
-
-
10
2
10
85
-
-
-
450
-
776
Max
50
80
6
65
80
110
1.5
13
14.8
14.5
15.15
15.225
15.4
20
1.34
40
20
50
-
8
8
500
500
-
-
Units
Continuous
Transient, 1 sec
Inhibited
No Load
Full Load, 20Hz to 10MHz
End-of-Life
V
V
mA
mA
mA
p-p
mA
p-p
V
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
V
OUT
V
OUT
V
OUT
V
OUT
V
OUT
T
CASE
= 25°C
T
CASE
= -55°C to +125°C
End-of-Life
14.85
14.775
14.565
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
-
-
-
78
-
-
-
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
-
-
-
-
-
-
350
250
500
300
10
0
500
500
900
500
20
50
mV
PK
Sec
mV
PK
Sec
mSec
mV
PK
Line Step Output Transient
2, 4
Notes:
1. Dependant on output voltage.
2. Time for output voltage to settle within 1% of its nominal value.
3. Derate linearly to 0 at 135°C.
4. Verified by qualification testing.
5. End-of-Life performance includes aging and radiation degradation and is within standard limits except where noted.
SVHF2800S-3.0
4
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