SVFL2815SFK [VPT]
SPACE QUALIFIED HYBRID DC-DC CONVERTERS;型号: | SVFL2815SFK |
厂家: | VPT, Inc. |
描述: | SPACE QUALIFIED HYBRID DC-DC CONVERTERS DC-DC转换器 |
文件: | 总16页 (文件大小:954K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
SVFL2800S SERIES
SPACE QUALIFIED HYBRID DC-DC CONVERTERS
Models Available
Input: 16 V to 40 V continuous, 50 V transient
120 W, single output of 3.3 V, 5 V, 12 V, 15 V
Qualified to MIL-PRF-38534 Class H and Class K
SVFL Series DC-DC Converter
1.0 DESCRIPTION
1.2 SPACE LEVEL CHARACTERIZATIONS
The SVFL Series of space qualified DC-DC converters 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,
Level P. Characterization is performed at both the component
level and at the SVFL Series hybrid converter level.
• Guaranteed TID performance to 30 krad(Si) including ELDRS
• SEE performance to 44 MeV-cm2/mg. Transients are fully
characterized for cross section and magnitude
• Worst-case analysis, stress, radiation, reliability reports available
1.3 MANUFACTURING AND COMPLIANCE
• Qualified to MIL-PRF-38534 Class H and Class K,
DLA SMD # 5962-11217
• 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
The SVFL Series of DC-DC converters is radiation tolerant and
suited for use in low Earth orbit (LEO), medium Earth orbit
(MEO), geostationary orbit (GEO), deep space, and launch
vehicle programs.
1.4 PACKAGING
• Low-profile: 3.005” x 1.505” x 0.400”
• Max weight: 86 g
• Industry standard pinout
1.1 FEATURES
• Precision seam-welded hermetic metal case
• Standard and optional side-flanged versions available
• Up to 120 W output power
• Wide input voltage range: 16 V to 40 V plus 50 V transient
• Continuous operation over full military temperature range of
-55 °C to +125 °C with no power derating
1.5 SIMILAR PRODUCTS AND ACCESSORIES
• Very low output noise
• SVFL 120 W dual output DC-DC converter
• SVRFL 100 W space qualified DC-DC converter, 100 krad(Si)
• Custom versions available
• 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
• EMI filters
• Non-isolated, space qualified point of load converters
• Use with Thermal Pad TP-001
Sales Information
Phone:(425) 353-3010
Fax: (425) 353-4030
Web: www.vptpower.com
SVFL2800S - 7.0
Page 1
E-mail: vptsales@vptpower.com
SVFL2800S Series
2.0 DIAGRAMS
2.1 BLOCK DIAGRAM
28VIN
+VOUT
OUTCOM
TRIM
INCOM
Q1
VOLTAGE AND
CURRENT
AMPLIFIERS
MAGNETIC
FEEDBACK
+S
UNDER
VOLTAGE
SHUTDOWN
-S
SHARE
INH2
PRIMARY
HOUSEKEEPING
SUPPLY
PWM
CONTROL
SECONDARY
HOUSEKEEPING
SUPPLY
INH1
SYNCIN
SYNCOUT
2.2 CONNECTION DIAGRAM
DVME28 EMI FILTER
SVFL2800S DC-DC CONVERTER
1
2
3
12
11
10
9
1
6
4
7
28VIN
28VIN
28VIN
28VOUT
28VOUT
28VOUT
28VIN
SYNCIN
INH1
+VOUT
+S
10
12
+
28 Vdc
INH2
-S
LOAD
-
4
5
6
INCOM OUTCOM
INCOM OUTCOM
INCOM OUTCOM
8
9
8
7
2
INCOM OUTCOM
CASE
3.0 SPECIFICATIONS
3.1 ABSOLUTE MAXIMUM RATINGS
Absolute Maximum Ratings
Input Voltage (Continuous):
-0.5 V to 40 V
-0.5 V to 50 V
1C
Operating Temperature (Full Load):
Storage Temperature:
-55 °C to +125 °C
-65 °C to +150 °C
270 °C
Input Voltage (Transient, 1 second):
ESD Rating per MIL-PRF-38534:
Lead Solder Temperature (10 seconds):
Sales Information
Phone:(425) 353-3010
Fax: (425) 353-4030
Web: www.vptpower.com
SVFL2800S - 7.0
Page 2
E-mail: vptsales@vptpower.com
SVFL2800S Series
3.2 PERFORMANCE SPECIFICATIONS
Tcase = -55 °C to +125 °C, Vin = +28 V ± 5%, Full Load, Unless Otherwise Specified
SVFL283R3S
SVFL2805S
Parameter
INPUT
Conditions
Min
Typ
Max
Min
Typ
Max
Units
Voltage
Continuous
16
28
-
40
50
16
28
-
40
50
V
2
-
-
V
Transient, 1 sec
INH 1 < 1.5 V
INH 2 < 1 V
No Load
Current
-
1
6
-
1
6
mA
mA
mA
mApp
V
-
-
40
60
25
-
70
-
-
40
65
35
-
70
120
80
120
80
Ripple Current
20 Hz to 10 MHz
Turn-On
-
-
Undervoltage Lockout
14.5
13.5
16.0
15.5
14.5
13.5
16.0
15.5
2
-
-
V
Turn-Off
OUTPUT STATIC
Voltage
Tcase = 25 °C
3.267
3.25
0
3.3
3.3
-
3.333
3.35
66
4.95
4.925
0
5
5
-
5.05
5.075
100
V
Tcase = -55 °C to +125 °C
V
4
W
Power
4
0
-
-
15
2
2
-
20
80
20
80
50
50
0
-
-
15
2
2
-
20
80
A
Current
Ripple Voltage
20 Hz to 10 MHz
mVpp
mV
mV
W
Line Regulation
Vin = 16 V to 40 V
No Load to Full Load
-
-
20
Load Regulation
-
-
100
50
2
Load Fault Power Dissipation
-
-
Overload
Short Circuit
-
-
-
-
50
W
OUTPUT DYNAMIC
Load Step, Half to Full Load
Output Transient
-
-
-
140
260
300
400
500
600
-
-
-
160
260
300
400
500
600
mVpk
µs
1
Recovery
2
Output Transient
mVpk
Line Step , Vin = 16 V to 40 V
1
-
-
-
300
5
500
20
-
-
-
300
5
500
20
µs
Recovery
Turn-On, Vin = 0 to 28 V
Delay
ms
Overshoot
0
15
0
25
mVpk
FUNCTION
2
Output Inhibited
Output Inhibited
Output Enabled
Output Enabled
0
0
-
-
-
1.5
1
0
0
-
-
-
1.5
1
V
V
V
INH 1 Pin Input
2
INH 2 Pin Input
2
2
10.5
15
10.5
15
INH 1 Pin Open Circuit Voltage
4
-10
2
-
-
-
-
12
+10
4
4
-20
2
-
-
-
-
12
+10
4
V
INH 2 Pin Open Circuit Voltage
Voltage Trim Range
%
2
V
SHARE Pin Voltage
SYNC Frequency Range
GENERAL
500
600
500
600
kHz
Efficiency
67
72
-
1000
600
-
72
77
-
1000
600
-
%
2
-
425
100
-
-
525
-
-
425
100
-
-
525
-
µF
kHz
MΩ
g
Capacitive Load
Switching Frequency
Isolation
500 V DC, Tcase = 25 °C
Standard and Optional Side-Flanged
SF @ Tcase = 55 °C
Weight
-
86
-
-
86
-
MTBF (MIL-HDBK-217F)
-
727
-
727
kHr
3
POST-RAD END-OF-LIFE
Input Ripple Current
Output Voltage
-
-
-
140
-
-
-
140
mApp
V
Tcase = -55 °C to +125 °C
3.24
3.35
4.89
5.10
1. Time for output voltage to settle within 1% of steady-state value
2. Verified by qualification testing
3. End-of-Life performance includes aging and radiation degradation and is within
standard limits except where noted
4. Derate linearly to 0 at 135 °C
Sales Information
Phone:(425) 353-3010
Fax: (425) 353-4030
Web: www.vptpower.com
SVFL2800S - 7.0
Page 3
E-mail: vptsales@vptpower.com
SVFL2800S Series
3.2 PERFORMANCE SPECIFICATIONS (CONTINUED)
Tcase = -55 °C to +125 °C, Vin = +28 V ± 5%, Full Load, Unless Otherwise Specified
SVFL2812S
SVFL2815S
Parameter
INPUT
Conditions
Min
Typ
Max
Min
Typ
Max
Units
Voltage
Continuous
16
28
-
40
50
16
28
-
40
50
V
2
-
-
V
Transient, 1 sec
INH 1 < 1.5 V
INH 2 < 1 V
No Load
Current
-
1
6
-
1
6
mA
mA
mA
mApp
V
-
-
40
80
30
-
70
-
-
40
85
30
-
70
120
80
120
80
Ripple Current
20 Hz to 10 MHz
Turn-On
-
-
Undervoltage Lockout
14.5
13.5
16.0
15.5
14.5
13.5
16.0
15.5
2
-
-
V
Turn-Off
OUTPUT STATIC
Voltage
Tcase = 25 °C
11.88
11.82
0
12
12
-
12.12
12.18
110
14.85
14.775
0
15
15
-
15.15
15.225
120
V
Tcase = -55 °C to +125 °C
V
4
W
Power
4
0
-
-
25
2
2
-
9.2
80
0
-
-
25
2
2
-
8
80
20
120
50
50
A
Current
Ripple Voltage
20 Hz to 10 MHz
mVpp
mV
mV
W
Line Regulation
Vin = 16 V to 40 V
No Load to Full Load
-
20
-
Load Regulation
-
120
50
-
2
Load Fault Power Dissipation
-
-
Overload
Short Circuit
-
-
50
-
-
W
OUTPUT DYNAMIC
Load Step, Half to Full Load
Output Transient
-
-
-
570
290
600
1000
500
-
-
-
640
260
600
1000
500
mVpk
µs
1
Recovery
2
Output Transient
1200
1200
mVpk
Line Step , Vin = 16 V to 40 V
1
-
-
-
300
5
500
20
-
-
-
300
5
500
20
µs
Recovery
Turn-On, Vin = 0 to 28 V
Delay
ms
Overshoot
0
50
0
50
mVpk
FUNCTION
2
Output Inhibited
Output Inhibited
Output Enabled
Output Enabled
0
0
-
-
-
1.5
1
0
0
-
-
-
1.5
1
V
V
V
INH 1 Pin Input
2
INH 2 Pin Input
2
2
10.5
15
10.5
15
INH 1 Pin Open Circuit Voltage
4
-20
2
-
-
-
-
12
+10
4
4
-20
2
-
-
-
-
12
+10
4
V
INH 2 Pin Open Circuit Voltage
Voltage Trim Range
%
2
V
SHARE Pin Voltage
SYNC Frequency Range
GENERAL
500
600
500
600
kHz
Efficiency
79
85
-
500
600
-
80
85
-
500
600
-
%
2
-
425
100
-
-
525
-
-
425
100
-
-
525
-
µF
kHz
MΩ
g
Capacitive Load
Switching Frequency
Isolation
500 V DC, Tcase = 25 °C
Standard and Optional Side-Flanged
SF @ Tcase = 55 °C
Weight
-
86
-
-
86
-
MTBF (MIL-HDBK-217F)
-
727
-
727
kHr
3
POST-RAD END-OF-LIFE
Input Ripple Current
Output Voltage
-
-
-
140
-
-
-
140
mApp
V
Tcase = -55 °C to +125 °C
11.66
12.28
14.565
15.355
1. Time for output voltage to settle within 1% of steady-state value
2. Verified by qualification testing
3. End-of-Life performance includes aging and radiation degradation and is within
standard limits except where noted
4. Derate linearly to 0 at 135 °C
Sales Information
Phone:(425) 353-3010
Fax: (425) 353-4030
Web: www.vptpower.com
SVFL2800S - 7.0
Page 4
E-mail: vptsales@vptpower.com
SVFL2800S Series
4.0 PERFORMANCE CURVES
4.1.1 SVFL283R3S Efficiency (Typical, 25 °C)
4.1.2 SVFL2805S Efficiency (Typical, 25 °C)
80
84
80
76
72
68
64
76
72
68
64
60
16 V
28 V
40 V
16 V
28 V
40 V
0
20
40
60
0
20
40
60
80
100
Output Power (W)
Output Power (W)
4.1.3 SVFL2812S Efficiency (Typical, 25 °C)
4.1.4 SVFL2815S Efficiency (Typical, 25 °C)
88
88
84
80
76
72
68
84
80
76
72
68
16 V
28 V
40 V
16 V
28 V
40 V
0
20
40
60
80
100
120
0
20
40
60
80
100
120
Output Power (W)
Output Power (W)
Sales Information
Phone:(425) 353-3010
E-mail: vptsales@vptpower.com
Fax: (425) 353-4030
SVFL2800S - 7.0
Page 5
Web: www.vptpower.com
SVFL2800S Series
5.0 MECHANICAL OUTLINES AND PINOUT
Standard Package:
1. Tolerances are +0.005” unless otherwise stated
2. Case temperature is measured on the center of the baseplate surface
3. Mounting holes are not threaded. Recommended fastener is 4-40
4. Materials: Case (Steel, gold over nickel plated); Cover (Kovar, nickel plated); Pin (Copper-cored alloy 52, gold over nickel plated); Pin Seals (Glass)
Pin Function
Pin Function
Pin Function
Pin Function
1
2
3
28VIN
INCOM
TRIM
4
5
6
INH1
7
8
9
+VOUT
OUTCOM
-S
10
11
12
+S
SYNC OUT
SYNC IN
SHARE
INH2
Sales Information
Phone:(425) 353-3010
Fax: (425) 353-4030
Web: www.vptpower.com
SVFL2800S - 7.0
Page 6
E-mail: vptsales@vptpower.com
SVFL2800S Series
5.0 MECHANICAL OUTLINES AND PINOUT (CONTINUED)
Optional Side-Flanged Package:
1. Tolerances are +0.005” unless otherwise stated
2. Case temperature is measured on the center of the baseplate surface
3. Mounting holes are not threaded. Recommended fastener is 4-40
4. Materials: Case (Steel, gold over nickel plated); Cover (Kovar, nickel plated); Pin (Copper-cored alloy 52, gold over nickel plated); Pin Seals (Glass)
Pin Function
Pin Function
Pin Function
Pin Function
1
2
3
28VIN
INCOM
TRIM
4
5
6
INH1
7
8
9
+VOUT
OUTCOM
-S
10
11
12
+S
SYNC OUT
SYNC IN
SHARE
INH2
Sales Information
Phone:(425) 353-3010
Fax: (425) 353-4030
Web: www.vptpower.com
SVFL2800S - 7.0
Page 7
E-mail: vptsales@vptpower.com
SVFL2800S Series
6.0 TECHNICAL NOTES
Please note that many of these
functions are also
demonstrated in detail on the VPT website in the form of technical video labs.
6.1 GENERAL INFORMATION
6.1.1 Topology Description
The SVFL2800S Series is an isolated, single output, forward converter. It operates over a wide input voltage range and provides a
tightly regulated positive output voltage with respect to the OUTCOM pin. Feedback isolation is accomplished using VPT’s proprietary
magnetic feedback technology. The converter regulates with zero load, and no minimum load is required.
6.1.2 External Components
The SVFL2800S Series is designed to operate stand-alone in most applications. It does not require any external components for proper
operation or to meet the datasheet specifications. Input and output L-C filters are provided internally for low ripple and noise. To further
reduce output ripple and noise, a small ceramic capacitor, 1 µF to 10 µF, can be added at the output. Most application-specific ripple
requirements can be met with the addition of output capacitors alone. External output capacitance can be added up to the maximum
listed in Section 3.2.
6.1.3 Source Impedance
The impedance of the 28 V input source can interact with the DC-DC converter and can affect performance. High source impedance is
often caused by a long input cable or components added in series with the input. Source resistance will cause a DC voltage drop as the
converter draws DC input current. This voltage drop is simply the cable resistance multiplied by the input current at low line. The
voltage drop and the actual voltage at the input to the converter will determine the minimum source voltage at which the converter will
operate. A high source inductance can interact with the feedback control loop of the converter. VPT’s EMI filters will usually isolate the
source and eliminate this problem. In some cases, additional input capacitance will be needed to stabilize the system.
6.1.4 Output Configurations
Since the converter is isolated, the output can be configured as a positive or negative voltage. For example, the SVFL2812S model can
provide +12 V referenced to OUTCOM or -12 V referenced to +VOUT.
The outputs of multiple converters can be stacked in series to provide higher voltages. When outputs of multiple modules are stacked,
they naturally share the load. For example, two SVFL2812S converters can be stacked to provide a 24 V output at 220 W.
6.2 FUNCTION DESCRIPTIONS
6.2.1 On/Off Control (INH1 and INH2)
The INH1 (Inhibit 1) pin is a primary-side control pin referenced
to INCOM. The INH1 pin must be driven using an open
collector or open drain configuration. Pulling the INH1 pin low
disables the converter output, removes bias voltage from
internal control circuitry, and puts the converter in a state of
minimum input current draw. Leaving INH1 open enables the
output, allowing the converter to operate normally. The pin
must be pulled below 1.5 V to disable the output. An optional
capacitor from INH1 to INCOM may be used to delay turn-on.
The INH1 pin should be left open if not used.
The INH2 (Inhibit 2) pin is a secondary-side control pin referenced to OUTCOM. The INH2 pin must also be driven in an open collector
or open drain configuration. Pulling INH2 low to OUTCOM disables the converter output. Internal control circuits, however, remain
active. The pin must be pulled below 1.0 V to disable the output. The INH2 pin should be left open if not used.
Sales Information
Phone:(425) 353-3010
Fax: (425) 353-4030
SVFL2800S - 7.0
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E-mail: vptsales@vptpower.com
Web: www.vptpower.com
SVFL2800S Series
7
+VOUT
6.2.2 Adjusting the Output Voltage (TRIM)
The output voltage set point of the converter can be adjusted using the TRIM pin. To
adjust the output up, connect the trim resistor from TRIM to OUTCOM. To adjust the
output down, connect the trim resistor from TRIM to +VOUT. The maximum trim
range is -20% and +10% from nominal (±10% for SVFL283R3S only). The
appropriate resistor values versus the output voltage are given in the table below.
Because the TRIM pin can be sensitive to external noise, the trim resistor should be
physically located close to the SVFL converter with short interconnects. The TRIM
pin should be left open if not used. When adjusting the output voltage, do not exceed
the rated total output power or output current.
30
10 +S
Rtrim
(TRIM DOWN)
10K
3
9
8
TRIM
-
Rt
+
Ri
+
2.5V
-
-S
Rtrim
(TRIM UP)
30
OUTCOM
SVFL283R3S
SVFL2805S
SVFL2812S
SVFL2815S
+Vout (V)
Rtrim (Ω)
+ Vout (V)
Rtrim (Ω)
35.0k
47.5k
68.3k
110k
+ Vout (V)
Rtrim (Ω)
+ Vout (V)
16.50
16.25
16.00
15.75
15.50
15.25
15.00
14.75
14.50
14.25
14.00
13.75
13.50
13.25
13.00
12.75
12.50
12.25
12.00
Rtrim (Ω)
3.60
68.3k
5.5
5.4
5.3
5.2
5.1
5.0
4.9
4.8
4.7
4.6
4.5
4.4
4.3
4.2
4.1
4.0
13.2
13.0
12.8
12.6
12.4
12.2
12.0
11.8
11.6
11.4
11.2
11.0
10.8
10.6
10.4
10.2
10.0
9.8
5.80k
10.0k
16.2k
26.6k
47.3k
109k
—
1.70k
5.00k
10.0k
18.3k
35.0k
85.0k
—
3.55
3.50
3.45
3.40
3.35
3.30
3.25
3.20
3.15
3.10
3.05
3.00
85.0k
110k
152k
235k
485k
—
235k
—
225k
135k
55.0k
28.3k
15.0k
7.00k
1.70k
100k
454k
213k
134k
94.0k
70.1k
54.3k
42.9k
34.4k
27.8k
22.5k
18.2k
14.6k
475k
225k
142k
100k
75.0k
58.3k
46.4k
37.5k
30.6k
25.0k
20.5k
16.7k
58.3k
37.5k
25.0k
16.7k
10.7k
6.30k
2.80k
short
9.6
6.2.3 Remote Sense (+S, -S)
Remote sensing compensates for voltage drops in the output pins and traces by sensing and regulating directly at the load. The remote
sense function can compensate for up to a 10% voltage drop (5% in the positive lead and 5% in the negative lead). The sum of the
TRIM up and remote sense compensation cannot exceed 10% such that the voltage at the output terminals of the converter does not
exceed 110% of the nominal output voltage. If not used, the user should connect +S to +VOUT and –S to OUTCOM at the pins of the
converter.
6.2.4 Frequency Synchronization (SYNCIN, SYNCOUT)
The SVFL2800S Series will free run at a switching frequency of approximately 525 kHz, which has been set for optimum converter
performance. Frequency synchronization is not necessary unless required by system constraints. The SVFL2800S Series provides a
frequency synchronization input (SYNCIN) and output (SYNCOUT), both referenced to INCOM.
The SYNCIN pin can be driven by an external clock or by the SYNCOUT pin of another SVFL converter. The internal clock and internal
power train will operate at the frequency applied to the SYNCIN pin. The SYNCIN pin should be driven with a TTL type 5 V square
wave signal. The duty cycle of the square wave should be between 20% and 80%. The SYNCIN pin is internally capacitively-coupled
and the internal load is equivalent to 220 pF. Proper layout and circuit techniques are necessary to prevent noise from being injected
into this pin. Synchronized converters should located physically close together and share a low impedance INCOM connection. The
SYNCIN pin can be left open or connected to INCOM if not used.
Sales Information
Phone:(425) 353-3010
Fax: (425) 353-4030
SVFL2800S - 7.0
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SVFL2800S Series
The SYNCOUT pin provides a 5 V quasi-square wave output at either the SYNCIN frequency or the free-running frequency if SYNCIN
is not used. The SYNCOUT of a SVFL can be connected to the SYNCIN pin of a second SVFL to synchronize its switching frequency
to that of the first SVFL. Similarly, the SYNCOUT of the second SVFL can be connected to SYNCIN of a third SVFL. Subsequent SVFL
converters can be connected in this daisy chain arrangement as shown in the figure. SYNCOUT should be left open if not used.
6.2.5 Parallel Operation (SHARE)
The SVFL2800S Series provides a SHARE function for active current sharing among paralleled modules. To enable load sharing,
connect a single wire between the SHARE pins of all parallel modules. The SHARE pin can be noise sensitive. Paralleled converters
should be located physically close to one another and share a low impedance OUTCOM connection. A symmetrical layout of the output
traces will improve share accuracy. Frequency synchronization is not required for parallel operation. The SHARE pin should be left
open if not used.
DVME28 EMI FILTER
SVFL2800S DC-DC CONVERTER
1
2
3
4
5
6
12
11
10
9
1
7
28VIN
28VIN
28VIN
28VOUT
28VOUT
28VOUT
28VIN
+VOUT
+S
10
6
SYNCIN
11
+
28 Vdc
SHARE
-S
LOAD
-
4
5
2
INCOM OUTCOM
INCOM OUTCOM
INCOM OUTCOM
INH1
8
9
8
SYNCOUT
7
INCOM OUTCOM
CASE
CASE
SVFL2800S DC-DC CONVERTER
1
7
28VIN
+VOUT
+S
10
6
SYNCIN
11
SHARE
-S
4
5
2
INH1
9
8
SYNCOUT
INCOM OUTCOM
CASE
SVFL2800S DC-DC CONVERTER
1
6
4
7
28VIN
SYNCIN
INH1
+VOUT
+S
10
11
SHARE
9
8
-S
2
INCOM
OUTCOM
CASE
6.3 PROTECTION FEATURES
6.3.1 Input Undervoltage Lockout
The SVFL2800S Series provides input undervoltage lockout protection. For input voltages below the turn-on voltage, the converter will
remain off, drawing minimal current from the source. When the input voltage exceeds the turn-on voltage, the converter will start. The
lockout circuit is designed to tolerate slow ramping input voltage waveforms. VPT’s proprietary magnetic feedback technology provides
bias voltage to all secondary control circuits and control amplifiers before the output starts, ensuring a well-controlled start up
sequence.
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6.3.2 Output Soft Start
The SVFL2800S Series utilizes an output soft-start function to ramp the output in a controlled manner, eliminating output voltage
overshoot and limiting inrush current at turn on. A voltage-mode soft-start ensures the output waveform remains consistent regardless
of changes in the load current. The output rise time is approximately 4 ms. The soft-start function is active whether the module is turned
on with an application of input voltage or from release of the inhibit pin. Under normal conditions, current drawn from the source during
turn-on will not exceed the full-load input current. The turn-on delay time is specified from the application of input voltage (or release of
the inhibit pin) until the output reaches 90% of its final value.
6.3.3 Output Overcurrent Protection
The SVFL2800S Series provides output overcurrent and output short circuit protection. During a load fault condition, a constant output
current control circuit reduces the converter duty cycle to limit the output current to approximately 125% its rated value. The converter
will continue to provide constant current into any overload or short circuit condition. This feature allows the converter to start into any
capacitive load. Recovery is automatic and immediate upon removal of the fault condition. Sustained short circuit or overload operation
can cause excessive power dissipation. Care should be taken to control the operating temperature of the converter in this condition.
6.4 THERMAL CONSIDERATIONS
The SVFL2800S Series is rated for full power operation at 125 °C. Operation above 125 °C is allowed at reduced power. Specifically,
the output power should be derated linearly from full power at 125 °C to half power at 130 °C and to zero power at 135 °C. The
operating temperature of the converter is specified on the baseplate of the converter. The converter is designed to be conduction-
cooled, with the baseplate mounted to a heat sink, chassis, PCB or other thermal surface. The internal power dissipating components
are mounted to the baseplate of the converter and all heat flow is through the baseplate and mounting flanges. The lid of the converter
does not provide a good thermal path.
The hybrid DC-DC converter contains many semiconductor components. The maximum temperature rise from junction to case is 15 °C
at full load.
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SVFL2800S Series
6.5 VPT RHA PLAN AND APPROACH
VPT takes a conservative approach to radiation testing to ensure product performance during space travel. VPT’s DLA approved
Radiation Hardness Assurance (RHA) plan documents VPT’s processes and procedures for guaranteeing the performance of VPT
products under various environmental conditions in space, including TID, SEE, and ELDRS.
Documents Available
Details
The radiation environments covered by this overview include: total ionizing dose (TID), which
includes enhanced low dose rate sensitivity (ELDRS); displacement damage (DD); and single
event effects (SEE).
DLA approved Radiation Hardness Assurance (RHA) Plan Summary
Worst-Case Analysis Report
Stress Report
Detailed worst-case analysis guarantees circuit performance post radiation and end of life.
Individual component stress analysis and deratings are included as part of the WCA report.
An overview report on the component level RLAT and characterization testing for TID and DD
as well as the hybrid level characterizations for TID and SEE response.
Radiation Test Summary Report
Reliability Report
MTBF report based on MIL-HDBK-217 reliability calculations.
Component temperature rise analysis and measurement results.
Thermal Analysis Report
Test Definition
VPT’s Approach
Total Ionizing Dose (TID). A measure of the energy absorbed in the
semiconductor components from the naturally occurring sources of
radiation (protons, electrons, photons). This results in the slow
degradation of semiconductor performance specifications. TID is tested
by exposing components to gamma radiation from a Cobalt-60 source.
Designed for 30 krad(Si). Sensitive semiconductor components undergo RLAT to 60 krad(Si)
per MIL-STD-883 Method 1019. Converters are characterized to 60 krad(Si).
Enhanced Low Dose Rate Sensitivity (ELDRS): Many linear-bipolar
integrated circuits show enhanced parameter degradation when exposed
at low dose rates close to those seen in a space environment as
compared to the high dose rates (50-300 rad(Si)/s) that components were
traditionally tested at for TID degradation. MIL-STD-883 Method 1019
gives guidance for characterizing components for ELDRS. Components
that exhibit ELDRS are tested for TID at a rate below 0.01 rad(Si)/s.
All bipolar linear ICs are characterized for ELDRS sensitivity and test IAW in accordance with
MIL-STD-883 test method 1019 section 3.13
Single Event Effects (SEE). Single high energy protons and heavy ions
can deposit sufficient energy in a semiconductor component, causing a
range of effects. SEEs include single event latchups (SELs), single event
gate ruptures (SEGRs), single event transients (SETs), single event
functional interrupts (SEFIs) and single event burnouts (SEBs).
Converters are characterized for catastrophic events (SEL, SEB, SEGR) as well as functional
interrupts (SEFI) under heavy ion exposure to LET = 44 MeV-cm2/mg. Converters are also
characterized for cross section and magnitude of output transients (SET) for at least 3
different LET levels.
Radiation Lot Acceptance Testing (RLAT): Semiconductor wafer lots are
exposed to TID on a sample basis. If the parameter degradation for the
tested samples is within the predetermined acceptance limits, then the lot
can be used in radiation hardened converters.
Sensitive semiconductor components undergo RLAT for TID.
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SVFL2800S Series
7.0 ENVIRONMENTAL SCREENING
100% tested per MIL-STD-883 as referenced to MIL-PRF-38534.
Contact sales for more information concerning additional environmental screening and testing options. VPT Inc. reserves the right to
ship higher screened or SMD products to meet orders for lower screening levels at our sole discretion unless specifically forbidden by
customer contract.
/EM
/H+
/K
(Engineering Model)
Non-QML1,6
MIL-STD-883 Test
Method, Condition
Test
(Class H + PIND)
(Class K)
Non-Destructive
Bond Pull
2
2
TM2023
●
●
●
●
●
TM2010, TM2017, TM2032
(MIL-STD-750, TM2072,
TM2073)
Internal Visual
●
●
TM1010, Condition C
-65 °C to 150 °C, Ambient
Temperature
Cycling
●
●
Constant
Acceleration
TM2001, 3000g, Y1
Direction
●
●
●
3
2
TM2020, Condition A
25 °C
PIND
●
Pre Burn-In
Electrical
TM1015, 320 hrs.,
125 °C, Case Typ
●
TM1015, 160 hrs.,
125 °C, Case Typ
Burn-In
●
●
24 hrs., 125 °C, Case Typ
●
●
MIL-PRF-38534, Group A
Subgroups 1-6
●
4
-55 °C, 25 °C, 125 °C
Final Electrical
MIL-PRF-38534, Group A
Subgroups 1 and 4
25 °C
TM1014, Fine Leak,
Condition A2 or B1
●
●
●
●
Hermeticity
(Seal)
TM1014, Gross Leak,
Condition C or B2
Gross Leak, Dip (1x10-3)
●
●
5
TM2012
●
●
Radiography
External Visual
TM2009
●
1. Non-QML products may not meet all requirements of MIL-PRF-38534
2. Not required per MIL-PRF-38534. Test performed for additional product quality
assurance
4. 100% R&R testing with all test data included in product shipment
5. Radiographic test Certificate of Compliance and film(s) or data CD included in
product shipment
3. PIND test Certificate of Compliance included in product shipment
6. Engineering models utilize only the screening specified and are not considered
compliant for flight use
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SVFL2800S Series
8.0 STANDARD MICROCIRCUIT DRAWING (SMD) NUMBERS
Standard Microcircuit SVFL2800S Series
Drawing Number Similar Part Number
5962P1121701HXC
5962P1121701HXA
5962P1121701HYC
5962P1121701HYA
5962P1121701KXC
5962P1121701KXA
5962P1121701KYC
5962P1121701KYA
SVFL283R3S/H+
SVFL283R3S/H+-E
SVFL283R3SF/H+
SVFL283R3SF/H+-E
SVFL283R3S/K
SVFL283R3S/K-E
SVFL283R3SF/K
SVFL283R3SF/K-E
5962P1121702HXC
5962P1121702HXA
5962P1121702HYC
5962P1121702HYA
5962P1121702KXC
5962P1121702KXA
5962P1121702KYC
5962P1121702KYA
SVFL2805S/H+
SVFL2805S/H+-E
SVFL2805SF/H+
SVFL2805SF/H+-E
SVFL2805S/K
SVFL2805S/K-E
SVFL2805SF/K
SVFL2805SF/K-E
5962P1121703HXC
5962P1121703HXA
5962P1121703HYC
5962P1121703HYA
5962P1121703KXC
5962P1121703KXA
5962P1121703KYC
5962P1121703KYA
SVFL2812S/H+
SVFL2812S/H+-E
SVFL2812SF/H+
SVFL2812SF/H+-E
SVFL2812S/K
SVFL2812S/K-E
SVFL2812SF/K
SVFL2812SF/K-E
5962P1121704HXC
5962P1121704HXA
5962P1121704HYC
5962P1121704HYA
5962P1121704KXC
5962P1121704KXA
5962P1121704KYC
5962P1121704KYA
SVFL2815S/H+
SVFL2815S/H+-E
SVFL2815SF/H+
SVFL2815SF/H+-E
SVFL2815S/K
SVFL2815S/K-E
SVFL2815SF/K
SVFL2815SF/K-E
Do not use the SVFL2800S Series similar part number for SMD product acquisition. It is listed for reference only. For exact
specifications for the SMD product, refer to the SMD drawing. SMDs can be downloaded from the DLA Land and Maritime (Previously
known as DSCC) website at https://landandmaritimeapps.dla.mil/programs/defaultapps.asp. The SMD number listed above represents
the Federal Stock Class, Device Type, Device Class Designator, Case Outline, Lead Finish and RHA Designator (where applicable).
Please reference the SMD for other screening levels, lead finishes, and radiation levels. All SMD products are marked with a “Q” on the
cover as specified by the QML certification mark requirement of MIL-PRF-38534.
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SVFL2800S Series
9.0 ORDERING INFORMATION
SVFL
28
05
S
F
/K
-
XXX
1
2
3
4
5
6
7
(1)
Product
Series
(2)
(3)
(4)
(5)
(6)
(7)
Nominal Input
Voltage
Output Voltage
Number of
Outputs
Package Option
Screening Code1,2,3
Additional
Screening
Code
SVFL
28 28 Volts
3R3 3.3 Volts
05 5 Volts
12 12 Volts
15 15 Volts
S
Single
(None)
Standard
Side-
Flanged
/EM Engineering Model
/H+ Class H + PIND
/K Class K
Contact Sales
F
1
2
Contact the VPT Sales Department for availability of Class H (/H) or Class K (/K) qualified products
VPT Inc. reserves the right to ship higher screened or SMD products to meet lower screened orders at our sole discretion unless specifically forbidden by customer
contract
3
Engineering models utilize only the standard screening specified and are not considered compliant for flight use. These models are intended for low volume engineering
characterization only and have no guarantee regarding operation in a radiation environment. The customer must place the following statement on each line item of their
purchase order(s) for /EM units when ordering engineering models:
“(Customer Name) acknowledges that the /EM unit listed in this line item is not permitted for flight use and will be used for Engineering characterization only.”
Please contact your sales representative or the VPT Inc. Sales Department for more information concerning additional environmental
screening and testing, different input voltage, output voltage, power requirements, source inspection, and/or special element evaluation
for space or other higher quality applications.
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SVFL2800S Series
10.0 CONTACT INFORMATION
To request a quotation or place orders please contact your sales representative or the VPT, Inc. Sales Department at:
Phone:
Fax:
(425) 353-3010
(425) 353-4030
E-mail:
vptsales@vptpower.com
All information contained in this datasheet is believed to be accurate, however, no responsibility is assumed for possible errors or
omissions. The products or specifications contained herein are subject to change without notice.
11.0 ADDITIONAL INFORMATION
Visit the VPT website for additional technical resources, including:
Product Catalogs
Application Notes and White Papers
Technical Video Labs
Additional Products For Avionics/Military,
Hi-Rel COTS, and Space Applications
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