The SVRFL Series of space qualified DC-DC converters is
specifically designed for the harsh radiation environment of
space applications and is designed in accordance with
Aerospace TOR requirements. Performance is guaranteed
through the use of hardened semiconductor components,
radiation lot acceptance testing (RLAT) of non-hardened
components, and analysis. The SVRFL 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, Level R. Characterization is performed at both the
component level and at the SVRFL Series hybrid converter level.
The SVRFL Series of DC-DC converters is radiation hardened
and suited for use in low Earth orbit (LEO), medium Earth orbit
(MEO), geostationary orbit (GEO), deep space, and launch
vehicle programs.
1.2 SPACE LEVEL CHARACTERIZATIONS
Guaranteed TID performance to 100 krad(Si) including ELDRS
SEE performance to 85 MeV-cm /mg. Transients are fully
characterized for cross section and magnitude
Worst-case analysis, stress, radiation, reliability reports available
2
1.3 MANUFACTURING AND COMPLIANCE
Qualified to MIL-PRF-38534 Class H and Class K,
DLA SMD #
5962-13234
Available compliant to MIL-HDBK-1547 and Aerospace TOR
component level element evaluation
MIL-PRF-38534 element evaluated components
MIL-STD-461 C/D/E/F when used with appropriate VPT EMI filter
Manufactured in a MIL-PRF-38534 Class H and Class K facility
MIL-STD-883
ISO-9001
1.4 PACKAGING
Low-profile: 3.005” x 1.505” x 0.400”
Max weight: 88 g
Industry standard pinout
Precision seam-welded hermetic metal case
1.1 FEATURES
Up to 100 W output power
Wide input voltage range: 18 V to 37.5 V plus 50 V transient
Continuous operation over full military temperature range of
-55 °C to +125 °C with no power derating
Very low output noise
Parallel up to 5 units with current sharing
Output voltage trim up +10% or down -20%
Radiation immune magnetic feedback circuit
No use of optoisolators
Undervoltage lockout
Current limit protection / short circuit protection
1.5 SIMILAR PRODUCTS AND ACCESSORIES
SVRFL
100 W single output DC-DC converter
SVFL
100 W space qualified DC-DC converter, 30 krad(Si)
Custom versions available
EMI filters
Non-isolated, space qualified
point of load converters
Use with Thermal Pad
TP-001
Products and reports described in this datasheet are subject to all export license restrictions and regulations which may include but are not limited to ITAR
(International Traffic in Arms Regulations) and the Export Administration and Foreign Assets Control Regulations. Further restrictions may apply. Contact VPT
sales for details.
Sales Information
Phone:(425) 353-3010
E-mail:
vptsales@vptpower.com
Fax: (425) 353-4030
Web:
www.vptpower.com
SVRFL2800D - 2.0
Page 1
SVRFL2800D Series
2.0 DIAGRAMS
2.1 BLOCK DIAGRAM
+VOUT
OUTCOM
28VIN
-VOUT
INCOM
Q1
MAGNETIC
FEEDBACK
VOLTAGE AND
CURRENT
AMPLIFIERS
TRIM
UNDER
VOLTAGE
SHUTDOWN
SHARE
PRIMARY
HOUSEKEEPING
SUPPLY
PWM
CONTROL
INH2
INH1
SYNCIN
SYNCOUT
SECONDARY
HOUSEKEEPING
SUPPLY
2.2 CONNECTION DIAGRAM
SVRME28 EMI FILTER
1
2
3
28Vdc
28VIN
28VIN
28VIN
INCOM
INCOM
INCOM
28VOUT
28VOUT
28VOUT
OUTCOM
OUTCOM
OUTCOM
12
11
6
10
9
8
7
CASE
2
INCOM
OUTCOM
8
4
SYNCIN
INH2
INH1
12
LOAD
SVRFL2800D DC-DC CONVERTER
1
7
28VIN
+VOUT
- VOUT
9
+
-
4
5
6
3.0 SPECIFICATIONS
3.1 ABSOLUTE MAXIMUM RATINGS
Absolute Maximum Ratings
Input Voltage (Continuous):
Input Voltage (Transient, 1 second):
ESD Rating per MIL-PRF-38534:
-0.5 V to 37.5 V
-0.5 V to 50 V
1C
Operating Temperature (Full Load):
Storage Temperature:
Lead Solder Temperature (10 seconds):
-55 °C to +125 °C
-65 °C to +150 °C
270 °C
Sales Information
Phone:(425) 353-3010
E-mail:
vptsales@vptpower.com
Fax: (425) 353-4030
Web:
www.vptpower.com
SVRFL2800D - 2.0
Page 2
SVRFL2800D Series
3.2 PERFORMANCE SPECIFICATIONS
Tcase = -55 °C to +125 °C, Vin = +28 V ± 5%, Full Load
1
, Unless Otherwise Specified
SVRFL2805D
Parameter
INPUT
Voltage
Current
Continuous
Transient, 1 sec4
INH 1 < 1.5 V
INH 2 < 1 V
No Load
20 Hz to 10 MHz
Turn-On
Turn-Off4
+Vout, Tcase = 25 °C
+Vout, Tcase = -55 °C to +125 °C
-Vout, Tcase = 25 °C
-Vout, Tcase = -55 °C to +125 °C
Power2
Current2
Ripple Voltage
Line Regulation
Load Regulation
Cross Regulation, -Vout
Load Fault Power Dissipation
OUTPUT DYNAMIC
Load Step, Half to Full Load, Either Output
Line Step4, Vin = 18V to 37.5 V
Turn-On, Vin = 0 to 28 V
FUNCTION
INH 1 Pin Input4
INH 2 Pin Input4
INH 1 Pin Open Circuit Voltage4
INH 2 Pin Open Circuit Voltage4
Voltage Trim Range
SHARE Pin Voltage4
SYNC Frequency Range
GENERAL
Efficiency
Capacitive Load4
Switching Frequency
Isolation
Weight
MTBF (MIL-HDBK-217F)
73
-
500 V DC, Tcase = 25 °C
Standard package option
SF @ Tcase = 55 °C
425
100
-
-
80
-
525
-
-
4.29
-
500
600
-
88
-
80
-
425
100
-
-
86
-
525
-
-
4.29
-
300
600
-
88
-
%
µF
kHz
MΩ
g
MHr
Output Inhibited
Output Inhibited
Output Enabled
Output Enabled
0
0
9
4
-20
2
500
-
-
-
-
-
-
-
1.5
1
15
12
10
4
600
0
0
9
4
-20
2
500
-
-
-
-
-
-
-
1.5
1
15
12
10
4
600
V
V
V
V
%
V
kHz
Output Transient
Recovery3
Output Transient
Recovery3
Delay
Overshoot
-
-
-
-
-
-
-
-
-
-
5
2
600
500
1000
500
20
25
-
-
-
-
-
-
-
-
-
-
5
20
1000
500
1500
500
20
50
mVpk
µs
mVpk
µs
ms
mVpk
Total
Either Output
Total
Either Output
20 Hz to 10 MHz
+Vout, V
IN
= 18 V to 37.5 V
-Vout, V
IN
= 18 V to 37.5 V
+Vout, No Load to Full Load
-Vout, No Load to Full Load
+Vout: 40% load, -Vout: 60% load
+Vout: 60% load, -Vout: 40% load
Overload4
Short Circuit
18
-
-
-
-
-
14.5
13
4.95
4.9
4.8
4.7
0
0
0
0
-
-
-
-
-
-
-
-
28
-
3.5
30
70
60
-
-
5
5
5
5
-
-
-
-
25
2
10
10
100
150
-
-
37.5
50
8
70
160
200
17.5
17
5.05
5.1
5.2
5.3
100
60
20
12
120
20
200
100
200
450
50
50
18
-
-
-
-
-
14.5
13
11.88
11.7
11.8
11.4
0
0
0
0
-
-
-
-
-
-
-
-
28
-
3.5
30
100
60
-
-
12
12
12
12
-
-
-
-
70
1
10
4
80
100
-
-
37.5
50
8
70
160
200
17.5
17
12.12
12.3
12.2
12.6
100
60
8.33
5
200
20
200
120
200
450
50
50
V
V
mA
mA
mA
mApp
V
V
V
V
V
V
W
W
A
A
mVpp
mV
mV
mV
mV
mV
W
W
Conditions
5
Min
Typ
Max
Min
SVRFL2812D
Typ
Max
Units
Ripple Current
Undervoltage Lockout
OUTPUT STATIC
Voltage1
1. Half load at +Vout and half load at -Vout
2. Up to 60% of the total power or current can be drawn from either of the two
outputs
3. Time for output voltage to settle within 1% of steady-state value
4. Verified by qualification testing
5. End-of-Life performance includes aging and radiation degradation and is within
standard limits except where noted
Sales Information
Phone:(425) 353-3010
E-mail:
vptsales@vptpower.com
Fax: (425) 353-4030
Web:
www.vptpower.com
SVRFL2800D - 2.0
Page 3
SVRFL2800D Series
3.2 PERFORMANCE SPECIFICATIONS (CONTINUED)
Tcase = -55 °C to +125 °C, Vin = +28 V ± 5%, Full Load
1
, Unless Otherwise Specified
SVRFL2815D
Parameter
INPUT
Voltage
Current
Conditions
5
Continuous
Transient, 1 sec4
INH 1 < 1.5 V
INH 2 < 1 V
No Load
20 Hz to 10 MHz
Turn-On
Turn-Off4
+Vout, Tcase = 25 °C
+Vout, Tcase = -55 °C to +125 °C
-Vout, Tcase = 25 °C
-Vout, Tcase = -55 °C to +125 °C
Power2
Current2
Ripple Voltage
Line Regulation
Load Regulation
Cross Regulation, -Vout
Load Fault Power Dissipation
OUTPUT DYNAMIC
Load Step, Half to Full Load, Either Output
Line Step4, Vin = 18V to 37.5 V
Turn-On, Vin = 0 to 28 V
FUNCTION
INH 1 Pin Input4
INH 2 Pin Input4
INH 1 Pin Open Circuit Voltage4
INH 2 Pin Open Circuit Voltage4
Voltage Trim Range
SHARE Pin Voltage4
SYNC Frequency Range
GENERAL
Efficiency
Capacitive Load4
Switching Frequency
Isolation
Weight
MTBF (MIL-HDBK-217F)
500 V DC, Tcase = 25 °C
Standard package option
SF @ Tcase = 55 °C
Output Inhibited
Output Inhibited
Output Enabled
Output Enabled
0
0
9
4
-20
2
500
78
-
425
100
-
-
-
-
-
-
-
-
-
83
-
550
-
-
4.29
1.5
1
15
12
10
4
600
-
300
600
-
88
-
V
V
V
V
%
V
kHz
%
µF
kHz
MΩ
g
MHr
Total
Either Output
Total
Either Output
20 Hz to 10 MHz
+Vout, V
IN
= 18 V to 37.5 V
-Vout, V
IN
= 18 V to 37.5 V
+Vout, No Load to Full Load
-Vout, No Load to Full Load
+Vout: 40% load, -Vout: 60% load
+Vout: 60% load, -Vout: 40% load
Overload4
Short Circuit
Output Transient
Recovery3
Output Transient
Recovery3
Delay
Overshoot
Min
18
-
-
-
-
-
14.5
13
14.85
14.625
14.7
14.275
0
0
0
0
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Typ
28
-
3.5
30
100
-
-
-
15
15
15
15
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Max
37.5
50
8
70
200
200
17.5
17
15.15
15.375
15.3
15.725
100
60
6.67
4
200
20
200
120
200
450
50
50
1000
500
1500
500
20
50
Units
V
V
mA
mA
mA
mApp
V
V
V
V
V
V
W
W
A
A
mVpp
mV
mV
mV
mV
mV
W
W
mVpk
µs
mVpk
µs
ms
mVpk
Ripple Current
Undervoltage Lockout
OUTPUT STATIC
Voltage1
1. Half load at +Vout and half load at -Vout
2. Up to 60% of the total power or current can be drawn from
either of the two outputs
3. Time for output voltage to settle within 1% of steady-state value
4. Verified by qualification testing
5. End-of-Life performance includes aging and radiation
degradation and is within standard limits except where noted
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