The SVRHF 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 SVRHF 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 SVRHF Series hybrid converter level.
The SVRHF 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 #
5962-13232
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: 2.890” x 1.125” x 0.405”
Max weight: 28 g
Industry standard pinout
Precision projection-welded hermetic metal case
Flanged and Non-flanged versions available
1.1 FEATURES
Up to 15 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
Radiation immune magnetic feedback circuit
No use of optoisolators
Undervoltage lockout
Current limit protection / short circuit protection
1.5 SIMILAR PRODUCTS AND ACCESSORIES
SVRHF
15 W single output DC-DC converter
SVHF
20 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-002
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
SVRHF2800D - 2.0
Page 1
SVRHF2800D Series
2.0 DIAGRAMS
2.1 BLOCK DIAGRAM
D2
+VOUT
C3
Rs3
OUTCOM
T1
D1
C2
L1
C1
-VOUT
INCOM
Q1
MAGNETIC
FEEDBACK
Rs1
VOLTAGE AND
CURRENT
AMPLIFIERS
Rs2
28VIN
UNDER
VOLTAGE
SHUTDOWN
PRIMARY
HOUSEKEEPING
SUPPLY
PWM
CONTROL
SECONDARY
HOUSEKEEPING
SUPPLY
INH
2.2 CONNECTION DIAGRAM
DVMH28 EMI FILTER
1
28V IN
28V OUT
2
SVRHF2800D DC-DC CONVERTER
8
28V IN
+V OUT
2
LOAD
28 Vdc
+
-
5
4
1
INH
OUT COM
3
LOAD
IN COM OUT COM
3
7
IN COM
-V OUT
6
4
CASE
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
SVRHF2800D - 2.0
Page 2
SVRHF2800D Series
3.2 PERFORMANCE SPECIFICATIONS
Tcase = -55 °C to +125 °C, Vin = +28 V ± 5%, Full Load
1
, Unless Otherwise Specified
SVRHF2805D
Parameter
INPUT
Voltage
Current
Ripple Current
Undervoltage Lockout
OUTPUT STATIC
Voltage
+Vout, Tcase = 25 °C
+Vout, Tcase = -55 °C to +125 °C
-Vout, Tcase = 25 °C
-Vout, Tcase = -55 °C to +125 °C
Total
Either Output
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 Pin Input4
INH Pin Open Circuit Voltage4
GENERAL
Efficiency
Capacitive Load4
Switching Frequency
Isolation
Weight
MTBF (MIL-HDBK-217F)
POST-RAD END-OF-LIFE LIMITS5
Input Ripple Current
Output Ripple Voltage
Output Voltage
72
-
500 V DC, Tcase = 25 °C
Non-flanged package option
Flanged package option
SF @ Tcase = 55 °C
350
100
-
-
-
-
-
4.9
79
-
450
-
-
-
4.388
-
-
-
-
500
500
-
24
28
-
200
180
5.1
77
-
350
100
-
-
-
-
-
11.7
83
-
450
-
-
-
4.388
-
-
-
-
300
500
-
24
28
-
200
310
12.3
%
µF
kHz
MΩ
g
g
MHr
mA
mVpp
V
Output Inhibited
Output Enabled
0
9
-
11
1.5
13
0
9
-
11
1.5
13
V
V
Output Transient
Recovery3
Output Transient
Recovery3
Delay
Overshoot
-
-
-
-
-
-
100
180
240
390
11
2
200
300
300
440
20
25
-
-
-
-
-
-
180
120
310
290
11
10
350
250
400
340
20
50
mVpk
µs
mVpk
µs
ms
mVpk
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: 70% load, -Vout: 30% load
+Vout: 30% load, -Vout: 70% load
Overload4
Short Circuit
4.95
4.925
4.8
4.75
0
0
0
0
-
-
-
-
-
-
-
-
5
5
5
5
-
-
-
-
150
1
15
2
12
300
-
-
5.05
5.075
5.2
5.25
15
10.5
3
2.1
250
10
100
30
100
450
8
8
11.88
11.82
11.8
11.52
0
0
0
0
-
-
-
-
-
-
-
-
12
12
12
12
-
-
-
-
100
1
6.5
1
12
380
-
-
12.12
12.18
12.2
12.48
15
10.5
1.25
0.88
200
10
100
30
100
550
8
8
V
V
V
V
W
W
A
A
mVpp
mV
mV
mV
mV
mV
W
W
Continuous
Transient, 1 sec4
INH < 1.5 V
No Load
20 Hz to 10 MHz
Turn-On
Turn-Off4
18
-
-
-
-
14
13
28
-
5
40
80
-
-
37.5
50
8
65
200
17.8
17.5
18
-
-
-
-
14
13
28
-
5
45
100
-
-
37.5
50
8
65
200
17.8
17.5
V
V
mA
mA
mApp
V
V
Conditions
Min
Typ
Max
Min
SVRHF2812D
Typ
Max
Units
Power2
Tcase = -55 °C to +125 °C
1. Half load at +Vout and half load at -Vout
2. Up to 70% of the total power or current can be drawn 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
SVRHF2800D - 2.0
Page 3
SVRHF2800D Series
3.2 PERFORMANCE SPECIFICATIONS (CONTINUED)
Tcase = -55 °C to +125 °C, Vin = +28 V ± 5%, Full Load
1
, Unless Otherwise Specified
SVRHF2815D
Parameter
INPUT
Voltage
Current
Ripple Current
Undervoltage Lockout
OUTPUT STATIC
Voltage
Conditions
Continuous
Transient, 1 sec4
INH < 1.5 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
Total
Either Output
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 Pin Input4
INH Pin Open Circuit Voltage4
GENERAL
Efficiency
Capacitive Load4
Switching Frequency
Isolation
Weight
MTBF (MIL-HDBK-217F)
POST-RAD END-OF-LIFE LIMITS5
Input Ripple Current
Output Ripple Voltage
Output Voltage
Output Inhibited
Output Enabled
0
9
80
-
500 V DC, Tcase = 25 °C
Non-flanged package option
Flanged package option
SF @ Tcase = 55 °C
350
100
-
-
-
-
-
14.63
-
11
84
-
450
-
-
-
4.388
-
-
-
1.5
13
-
300
500
-
24
28
-
300
300
15.37
V
V
%
µF
kHz
MΩ
g
g
MHr
mApp
mVpp
V
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: 70% load, -Vout: 30% load
+Vout: 30% load, -Vout: 70% load
Overload4
Short Circuit
Output Transient
Recovery3
Output Transient
Recovery3
Delay
Overshoot
Min
18
-
-
-
-
14
13
14.85
14.775
14.8
14.40
0
0
0
0
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Typ
28
-
5
50
70
-
-
15
15
15
15
-
-
-
-
120
1
20
2
20
350
-
-
150
70
320
250
9
25
Max
37.5
50
8
70
200
17.8
17.5
15.15
15.225
15.2
15.6
15
10.5
1
0.7
250
10
150
30
100
600
8
8
300
150
400
300
20
50
Units
V
V
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
Power2
Tcase = -55 °C to +125 °C
1. Half load at +Vout and half load at -Vout
2. Up to 70% 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
白光LED光衰原因之荧光粉性能的衰退 到目前，白光 LED、尤其是小功率白光 LED 的发光性能快速衰退已越来越为人们所认识。其实，盲目地夸大宣传，只能将 LED 行业引向歧途，不正视白光 LED 存在的问题，只能延缓白光 LED 应用的发展。只有正视问题、研究问题、尽早解决问题，白光 LED 才能健康、快速发展。 白光 LED 当前面临的一个主要问题就寿命问题。由于白光 LED 的价格尚很...[详细]
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