SVFL2800S Series
HIGH RELIABILITY HYBRID
RADIATION TOLERANT DC-DC CONVERTERS
DESCRIPTION
The SVFL 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 SVFL
series is a magnetic feedback circuit that is radiation
immune. Operating at a nominal fixed frequency of
525 kHz, these regulated, isolated units utilize well
controlled undervoltage lockout circuitry to eliminate slow
start-up problems. The current sharing function allows a
maximum of five units to be connected in parallel to boost
the total output power to 5 times.
The SVFL 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 SVFL 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 SVFL 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
Parallel Up to 5 Units With Current Sharing
Output Voltage Trim Up +10% or Down –20%
Wide Input Voltage Range: 16 to 40 Volts per MIL-
STD-704
Up to 120 Watts Output Power
Radiation Immune Magnetic Feedback Circuit
NO Use of Optoisolators
Undervoltage Lockout
Current Limit and Short Circuit Protection
High Input Transient Voltage: 50 Volts for 1 sec per
MIL-STD-704A
Precision Seam Welded Hermetic Package
High Power Density: > 80 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
MIL-PRF-38534 Element Evaluated Components
Utilized
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Figure 1
– SVFL2800S 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.
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
SVFL2800S-2.0
1
SVFL2800S 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)
40 V
DC
50 Volts
120 Watts
41 Watts
Junction Temperature Rise to Case
Storage Temperature
Lead Solder Temperature (10 seconds)
Weight (Maximum)
SVFL283R3S
Min
16
-
-
-
-
-
-
0
0
4
4
+15°C
-65°C to +150°C
270°C
86 Grams
Parameter
STATIC
INPUT
4
Voltage
Conditions
5
SVFL2805S
Max
40
50
6
70
120
80
140
1.5
1
15
12
16
15.5
3.333
3.35
3.35
66
20
80
20
80
10
4
-
50
50
1000
600
600
-
-
Typ
28
-
1
40
60
25
-
-
-
-
-
-
-
3.30
3.30
-
-
-
15
2
2
-
-
72
-
-
-
525
-
-
727
Min
16
-
-
-
-
-
-
0
0
10.5
4
14.5
13.5
4.95
4.925
4.89
0
-
-
-
-
-20
2
72
-
-
-
425
500
100
-
Typ
28
-
1
40
65
35
-
-
-
-
-
-
-
5.00
5.00
-
-
-
15
2
2
-
-
77
-
-
-
525
-
-
727
Max
40
50
6
70
120
80
140
1.5
1
15
12
16
15.5
5.05
5.075
5.10
100
20
80
20
100
10
4
-
50
50
1000
600
600
-
-
Units
Continuous
Transient, 1 sec
Inhibited 1
Inhibited 2
No Load
Full Load, 20Hz to 10MHz
End-of-Life
4
4
V
V
mA
mA
mA
mA
p-p
mA
p-p
V
V
V
V
V
V
V
V
V
W
A
mV
p-p
mV
mV
%
V
%
W
W
μF
kHz
kHz
MΩ
kHrs
Current
Ripple Current
INH1 Pin Input
INH2 Pin Input
INH1 Pin Open Circuit Voltage
INH2 Pin Open Circuit Voltage
UVLO Turn On
UVLO Turn Off
OUTPUT
Voltage
Power
Current
Ripple Voltage
Line Regulation
Load Regulation
Voltage Trim
EFFICIENCY
4
4
4
10.5
4
14.5
13.5
V
OUT
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
3.267
3.25
3.24
0
-
Full Load, 20Hz to 10MHz
V
IN
= 16V to 40V
No Load to Full Load
Full Load
-
-
-
-10
2
67
Share Pin Voltage
LOAD FAULT POWER DISSIPATION
CAPACITIVE LOAD
4
Overload
4
-
-
-
425
Short Circuit
SWITCHING FREQUENCY
SYNC FREQUENCY RANGE
ISOLATION
MTBF (MIL-HDBK-217F)
V
H
– V
L
= 5V
Duty Cycle = 20% - 80%
500 V
DC
SF @ T
C
= 55°C
500
100
-
See notes next page
.
SVFL2800S-2.0
2
SVFL2800S 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)
40 V
DC
50 Volts
120 Watts
41 Watts
Junction Temperature Rise to Case
Storage Temperature
Lead Solder Temperature (10 seconds)
Weight (Maximum)
SVFL283R3S
Min
-
-
-
-
-
-
+15°C
-65°C to +150°C
270°C
86 Grams
Parameter
DYNAMIC
Load Step Output Transient
Load Step Recovery
Line Step Recovery
Turn On Delay
Turn On Overshoot
2
4
Conditions
5
SVFL2805S
Max
400
500
600
500
20
15
Typ
140
260
300
300
5
0
Min
-
-
-
-
-
-
Typ
160
260
300
300
5
0
Max
400
500
600
500
20
25
Units
V
OUT
V
OUT
V
OUT
Half Load to Full Load
V
IN
= 16V to 40V
V
IN
= 0V to 28V
mV
PK
μSec
mV
PK
μSec
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.
SVFL2800S-2.0
3
SVFL2800S 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)
40 V
DC
50 Volts
120 Watts
41 Watts
Junction Temperature Rise to Case
Storage Temperature
Lead Solder Temperature (10 seconds)
Weight (Maximum)
SVFL2812S
Min
16
-
-
-
-
-
-
0
0
4
4
+15°C
-65°C to +150°C
270°C
86 Grams
Parameter
STATIC
INPUT
4
Voltage
Conditions
5
SVFL2815S
Max
40
50
6
70
120
80
140
1.5
1
15
12
16
15.5
12.12
12.18
12.28
110
9.2
80
20
120
10
4
-
50
50
500
600
600
-
-
Typ
28
-
1
40
80
30
-
-
-
-
-
-
-
12.00
12.00
-
-
-
25
2
2
-
-
85
-
-
-
525
-
-
727
Min
16
-
-
-
-
-
-
0
0
10.5
4
14.5
13.5
14.85
14.775
14.565
-
-
-
-
-
-20
2
80
-
-
-
425
500
100
-
Typ
28
-
1
40
85
30
-
-
-
-
-
-
-
15.00
15.00
-
-
-
25
2
2
-
-
85
-
-
-
525
-
-
727
Max
40
50
6
70
120
80
140
1.5
1
15
12
16
15.5
15.15
15.225
15.355
120
8.0
80
20
120
10
4
-
50
50
500
600
600
-
-
Units
Continuous
Transient, 1 sec
Inhibited 1
Inhibited 2
No Load
Full Load, 20Hz to 10MHz
End-of-Life
4
4
V
V
mA
mA
mA
mA
p-p
mA
p-p
V
V
V
V
V
V
V
V
V
W
A
mV
p-p
mV
mV
%
V
%
W
W
μF
kHz
kHz
MΩ
kHrs
Current
Ripple Current
INH1 Pin Input
INH2 Pin Input
INH1 Pin Open Circuit Voltage
INH2 Pin Open Circuit Voltage
UVLO Turn On
UVLO Turn Off
OUTPUT
Voltage
Power
Current
Ripple Voltage
Line Regulation
Load Regulation
Voltage Trim
EFFICIENCY
4
4
4
10.5
4
14.5
13.5
V
OUT
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
11.88
11.82
11.66
-
-
Full Load, 20Hz to 10MHz
V
IN
= 16V to 40V
No Load to Full Load
Full Load
-
-
-
-20
2
79
Share Pin Voltage
LOAD FAULT POWER DISSIPATION
CAPACITIVE LOAD
4
Overload
4
-
-
-
425
Short Circuit
SWITCHING FREQUENCY
SYNC FREQUENCY RANGE
ISOLATION
MTBF (MIL-HDBK-217F)
V
H
– V
L
= 5V
Duty Cycle = 20% - 80%
500 V
DC
SF @ T
C
= 55°C
500
100
-
See notes next page
.
SVFL2800S-2.0
4
SVFL2800S 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)
40 V
DC
50 Volts
120 Watts
41 Watts
Junction Temperature Rise to Case
Storage Temperature
Lead Solder Temperature (10 seconds)
Weight (Maximum)
SVFL2812S
Min
-
-
-
-
-
-
+15°C
-65°C to +150°C
270°C
86 Grams
Parameter
DYNAMIC
Load Step Output Transient
Load Step Recovery
Line Step Recovery
Turn On Delay
Turn On Overshoot
2
4
Conditions
5
SVFL2815S
Max
1000
500
1200
500
20
50
Typ
570
290
600
300
5
0
Min
-
-
-
-
-
-
Typ
640
260
600
300
5
0
Max
1000
500
1200
500
20
50
Units
V
OUT
V
OUT
V
OUT
Half Load to Full Load
V
IN
= 16V to 40V
V
IN
= 0V to 28V
mV
PK
μSec
mV
PK
μSec
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.
4. Verified by qualification testing.
3. Derate linearly to 0 at 135°C.
5. End-of-Life performance includes aging and radiation degradation and is within standard limits except where noted.
SVFL2800S-2.0
5
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