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
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Figure 1
– SVFL2800D DC-DCConverter
(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
SVFL2800D-2.0
1
SVFL2800D Series
SPECIFICATIONS
(T
CASE
= -55°C to +125°C, V
IN
= +28V ± 5%, Full Load
5
, 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)
Parameter
40 V
DC
50 Volts
120 Watts
40 Watts
7
Junction Temperature Rise to Case
Storage Temperature
Lead Solder Temperature (10 seconds)
Weight (Maximum) (No Pin Extensions)
SVFL2805D
Min
Typ
Max
Min
SVFL2812D
Typ
+15°C
-65°C to +150°C
270°C
88 Grams
Units
Conditions
Max
STATIC
INPUT
4
Voltage
Continuous
Transient, 1 sec
Inhibited 1
Current
Inhibited 2
No Load
Ripple Current
INH1 Pin Input
INH2 Pin Input
4
4
4
4
16
-
-
-
-
-
-
0
0
10.5
4
14.5
13.5
28
-
1
40
75
30
-
-
-
-
-
-
-
5.00
5.00
-
5.00
5.00
-
-
-
-
15
2
10
10
55
260
-
-
79
-
-
40
50
3
70
160
80
140
1.5
1
15
12
16
15.5
5.05
5.075
5.10
5.20
5.25
5.275
100
70
14
80
20
200
100
200
450
10
4
-
50
50
16
-
-
-
-
-
-
0
0
10.5
4
14.5
13.5
11.88
11.82
11.66
11.80
11.52
11.36
-
-
-
-
-
-
-
-
-
-20
2
79
-
-
28
-
1
40
90
35
-
-
-
-
-
-
-
12.00
12.00
-
12.00
12.00
-
-
-
-
25
2
10
2
40
220
-
-
85
-
-
40
50
3
70
160
80
140
1.5
1
15
12
16
15.5
12.12
12.18
12.28
12.20
12.48
12.58
110
77
6.4
80
20
200
120
200
450
10
4
-
50
50
V
V
mA
mA
mA
mA
p-p
mA
p-p
V
V
V
V
V
V
V
V
V
V
V
V
W
W
A
mV
p-p
mV
mV
mV
mV
mV
%
V
%
W
W
Full Load , 20Hz to 10MHz
End-of-Life
5
INH1 Pin Open Circuit Voltage
INH2 Pin Open Circuit Voltage
UVLO Turn On
UVLO Turn Off
4
+V
OUT
+V
OUT
OUTPUT
5
Voltage
+V
OUT
-V
OUT
-V
OUT
-V
OUT
Power
3,6
T
CASE
= 25°C
T
CASE
= -55°C to +125°C
End-of-Life
T
CASE
= 25°C
T
CASE
= -55°C to +125°C
End-of-Life
Either Output
Either Output
Full Load , 20Hz to 10MHz
V
IN
= 16V to 40V
V
IN
= 16V to 40V
No Load to Full Load
No Load to Full Load
5
5
5
4.95
4.925
4.89
4.80
4.75
4.715
-
-
-
-
-
-
-
-
-
-20
2
Total
±V
OUT
±V
OUT
±V
OUT
+V
OUT
-V
OUT
+V
OUT
-V
OUT
-V
OUT
4
Current
3,6
Ripple Voltage
Line Regulation
Load Regulation
Cross Regulation
Voltage Trim
Share Pin Voltage
EFFICIENCY
V1+ Load 30% - Load 70%
V2+ Load 70% - Load 30%
Full Load
Full Load
Overload
5
73
-
-
4
LOAD FAULT POWER DISSIPATION
See notes next page.
Short Circuit
SVFL2800D-2.0
2
SVFL2800D Series
SPECIFICATIONS
(T
CASE
= -55°C to +125°C, V
IN
= +28V ± 5%, Full Load
5
, 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
40 Watts
Junction Temperature Rise to Case
Storage Temperature
Lead Solder Temperature (10 seconds)
Weight (Maximum) (No Pin Extensions)
SVFL2805D
Min
Typ
Max
Min
SVFL2812D
Typ
Max
+15°C
-65°C to +150°C
270°C
88 Grams
Parameter
Conditions
7
Units
STATIC (continued)
CAPACITIVE LOAD
4
-
425
V
H
– V
L
= 5V
Duty Cycle = 20% - 80%
500 V
DC
, T
CASE
= 25°C
SF @ T
C
= 55°C
500
100
-
-
525
-
-
727
500
600
600
-
-
-
425
500
100
-
-
525
-
-
727
500
600
600
-
-
μF
kHz
kHz
MΩ
kHrs
SWITCHING FREQUENCY
SYNC FREQUENCY RANGE
ISOLATION
MTBF (MIL-HDBK-217F)
DYNAMIC
Load Step Output Transient
Load Step Recovery
Line Step Recovery
Turn On Delay
Turn On Overshoot
2
4
±V
OUT
±V
OUT
±V
OUT
Half Load to Full Load
V
IN
= 16V to 40V
V
IN
= 0V to 28V
-
-
-
-
-
-
130
200
300
300
5
0
400
500
600
500
20
25
-
-
-
-
-
-
260
140
600
300
5
0
500
500
1200
500
20
50
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. Half load at +V
OUT
and half load at –V
OUT
.
6. Up to 70% of the total power or current can be drawn from any one of the two outputs.
7. End-of-Life performance includes aging and radiation degradation and is within standard limits except where noted.
SVFL2800D-2.0
3
SVFL2800D Series
SPECIFICATIONS
(T
CASE
= -55°C to +125°C, V
IN
= +28V ± 5%, Full Load
5
, 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)
Parameter
40 V
DC
50 Volts
120 Watts
40 Watts
7
Junction Temperature Rise to Case
Storage Temperature
Lead Solder Temperature (10 seconds)
Weight (Maximum) (No Pin Extensions)
SVFL2815D
Min
Typ
Max
Units
+15°C
-65°C to +150°C
270°C
88 Grams
Conditions
STATIC
INPUT
4
Voltage
Continuous
Transient, 1 sec
Inhibited 1
Current
Inhibited 2
No Load
Ripple Current
INH1 Pin Input
INH2 Pin Input
4
4
4
4
16
-
-
-
-
-
-
0
0
10.5
4
14.5
13.5
28
-
1
40
110
40
-
-
-
-
-
-
-
15.00
15.00
-
15.00
15.00
-
-
-
-
30
2
10
2
30
200
-
-
85
-
-
40
50
3
70
160
80
140
1.5
1
15
12
16
15.5
15.15
15.225
15.355
15.20
15.60
15.73
120
84
5.6
80
20
200
120
200
450
10
4
-
50
50
V
V
mA
mA
mA
mA
p-p
mA
p-p
V
V
V
V
V
V
V
V
V
V
V
V
W
W
A
mV
p-p
mV
mV
mV
mV
mV
%
V
%
W
W
Full Load , 20Hz to 10MHz
End-of-Life
5
INH1 Pin Open Circuit Voltage
INH2 Pin Open Circuit Voltage
UVLO Turn On
UVLO Turn Off
4
+V
OUT
+V
OUT
OUTPUT
5
Voltage
+V
OUT
-V
OUT
-V
OUT
-V
OUT
Power
3,6
T
CASE
= 25°C
T
CASE
= -55°C to +125°C
End-of-Life
T
CASE
= 25°C
T
CASE
= -55°C to +125°C
End-of-Life
Either Output
Either Output
Full Load , 20Hz to 10MHz
V
IN
= 16V to 40V
V
IN
= 16V to 40V
No Load to Full Load
No Load to Full Load
5
5
5
14.85
14.775
14.565
14.80
14.40
14.19
-
-
-
-
-
-
-
-
-
-20
2
Total
±V
OUT
±V
OUT
±V
OUT
+V
OUT
-V
OUT
+V
OUT
-V
OUT
-V
OUT
4
Current
3,6
Ripple Voltage
Line Regulation
Load Regulation
Cross Regulation
Voltage Trim
Share Pin Voltage
EFFICIENCY
V1+ Load 30% - Load 70%
V2+ Load 70% - Load 30%
Full Load
Full Load
Overload
5
80
-
-
4
LOAD FAULT POWER DISSIPATION
See notes next page.
Short Circuit
SVFL2800D-2.0
4
SVFL2800D Series
SPECIFICATIONS
(T
CASE
= -55°C to +125°C, V
IN
= +28V ± 5%, Full Load
5
, 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
40 Watts
Junction Temperature Rise to Case
Storage Temperature
Lead Solder Temperature (10 seconds)
Weight (Maximum) (No Pin Extensions)
SVFL2815D
Min
Typ
Max
+15°C
-65°C to +150°C
270°C
88 Grams
Parameter
Conditions
7
Units
STATIC (continued)
CAPACITIVE LOAD
4
-
425
V
H
– V
L
= 5V
Duty Cycle = 20% - 80%
500 V
DC
, T
CASE
= 25°C
SF @ T
C
= 55°C
500
100
-
-
525
-
-
727
500
600
600
-
-
μF
kHz
kHz
MΩ
kHrs
SWITCHING FREQUENCY
SYNC FREQUENCY RANGE
ISOLATION
MTBF (MIL-HDBK-217F)
DYNAMIC
Load Step Output Transient
Load Step Recovery
Line Step Recovery
Turn On Delay
Turn On Overshoot
2
4
±V
OUT
±V
OUT
±V
OUT
Half Load to Full Load
V
IN
= 16V to 40V
V
IN
= 0V to 28V
-
-
-
-
-
-
260
110
600
300
5
0
500
500
1200
500
20
50
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. Half load at +V
OUT
and half load at –V
OUT
.
6. Up to 70% of the total power or current can be drawn from any one of the two outputs.
7. End-of-Life performance includes aging and radiation degradation and is within standard limits except where noted.
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Embedded System
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