SVTR2805S/H+ [VPT]
SPACE QUALIFIED HYBRID DC-DC CONVERTERS;
| 型号： | SVTR2805S/H+ |
| 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：1043K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SVTR2800S SERIES
SPACE QUALIFIED HYBRID DC-DC CONVERTERS
Models Available
Input: 15 V to 50 V continuous, 80 V transient
40 W, single output of 3.3 V, 5 V, 8 V, 12 V, 15 V
Qualified to MIL-PRF-38534 Class H and Class K
SVTR Series DC-DC Converter
1.0 DESCRIPTION
1.2 SPACE LEVEL CHARACTERIZATIONS
The SVTR 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
• 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
acceptance testing (RLAT) of non-hardened components, and
analysis. The SVTR 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 SVTR Series hybrid converter level.
1.3 MANUFACTURING AND COMPLIANCE
• Qualified to MIL-PRF-38534 Class H and Class K,
DLA SMD # 5962-11220
• 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 SVTR 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: 2.890” x 1.125” x 0.405”
• Max weight: 55 g
• Industry standard pinout
1.1 FEATURES
• Precision seam-welded hermetic metal case
• Flanged and Non-flanged versions available
• Up to 40 W output power
• Wide input voltage range: 15 V to 50 V plus 80 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
• SVTR 40 W dual output DC-DC converter
• SVRTR 40 W space qualified DC-DC converter, 100 krad(Si)
• Custom versions available
• Output voltage trim up +10%
• 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-003
Sales Information
Phone:(425) 353-3010
Fax: (425) 353-4030
Web: www.vptpower.com
SVTR2800S - 7.0
Page 1
E-mail: vptsales@vptpower.com
SVTR2800S Series
2.0 DIAGRAMS
2.1 BLOCK DIAGRAM
D1
T1
28VIN
+VOUT
L1
C2
C1
Rs2
OUTCOM
INCOM
Q1
VOLTAGE AND
CURRENT
-S
AMPLIFIERS
MAGNETIC
FEEDBACK
UNDER
VOLTAGE
SHUTDOWN
Rs1
+S
PRIMARY
HOUSEKEEPING
SUPPLY
PWM
CONTROL
SECONDARY
HOUSEKEEPING
SUPPLY
INH
SYNC
2.2 CONNECTION DIAGRAM
DVMC28 EMI FILTER
SVTR2800S DC-DC CONVERTER
1
1
9
2
5
2
28VIN
28VOUT
28VIN
SYNC
INH
+VOUT
+S
6
+
28 Vdc
LOAD
-
3
4
-S
5
4
10
INCOM OUTCOM
3
INCOM OUTCOM
7, 8
CASE
3.0 SPECIFICATIONS
3.1 ABSOLUTE MAXIMUM RATINGS
Absolute Maximum Ratings
Input Voltage (Continuous):
-0.5 V to 50 V
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:
-0.5 V to 80 V
3A
Lead Solder Temperature (10 seconds):
Sales Information
Phone:(425) 353-3010
Fax: (425) 353-4030
Web: www.vptpower.com
SVTR2800S - 7.0
Page 2
E-mail: vptsales@vptpower.com
SVTR2800S Series
3.2 PERFORMANCE SPECIFICATIONS
Tcase = -55 °C to +125 °C, Vin = +28 V ± 5%, Full Load, Unless Otherwise Specified
SVTR283R3S
SVTR2805S
Parameter
INPUT
Conditions
Min
Typ
Max
Min
Typ
Max
Units
Voltage
Continuous
15
-
28
-
50
80
15
-
28
-
50
80
V
2
V
Transient, 1 sec
INH < 1.5 V
No Load
Current
-
4
6
-
4
6
mA
mA
mApp
V
-
50
20
-
90
-
55
30
-
90
Ripple Current
20 Hz to 10 MHz
Turn-On
-
50
-
50
Undervoltage Lockout
12
11
14.8
14.5
12
11
14.8
14.5
2
-
-
V
Turn-Off
OUTPUT STATIC
Voltage
Tcase = 25 °C
3.25
3.20
0
3.30
3.30
-
3.35
3.40
20
4.95
4.875
0
5
5
-
5.05
5.125
30
V
Tcase = -55 °C to +125 °C
V
4
W
Power
4
0
-
-
25
2
2
-
6.06
50
0
-
-
20
2
2
-
6
A
Current
Ripple Voltage
20 Hz to 10 MHz
50
20
50
16
16
mVpp
mV
mV
W
Line Regulation
Vin = 15 V to 50 V
No Load to Full Load
-
20
-
Load Regulation
-
50
-
2
Load Fault Power Dissipation
-
16
-
Overload
Short Circuit
-
-
16
-
-
W
OUTPUT DYNAMIC
Load Step, Half to Full Load
Output Transient
-
-
-
180
260
300
500
500
600
-
-
-
170
60
500
500
600
mVpk
µs
1
Recovery
2
Output Transient
300
mVpk
Line Step , Vin = 16V to 40 V
1
-
-
-
300
10
0
500
20
-
-
-
300
10
0
500
20
µs
Recovery
Turn-On, Vin = 0 to 28 V
Delay
ms
Overshoot
15
25
mVpk
FUNCTION
2
Output Inhibited
Output Enabled
0
9
-
11
-
1.5
13
0
9
-
11
-
1.5
13
V
INH Pin Input
2
V
INH Pin Open Circuit Voltage
SYNC Frequency Range
GENERAL
500
600
500
600
kHz
Efficiency
65
-
70
-
-
72
-
76
-
-
%
2
1000
1000
µF
Capacitive Load
Switching Frequency
Isolation
400
525
550
-
400
525
550
-
kHz
MΩ
g
500 V DC, Tcase = 25 °C
Non-flanged package option
Flanged package option
SF @ Tcase = 55 °C
100
-
100
-
Weight
-
-
-
-
-
52
55
-
-
-
-
-
-
52
55
-
g
MTBF (MIL-HDBK-217F)
752
752
kHr
3
POST-RAD END-OF-LIFE LIMITS
Input Ripple Current
-
-
-
70
-
-
-
70
mApp
V
Output Voltage
Tcase = -55 °C to +125 °C
3.2
3.4
4.875
5.125
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
SVTR2800S - 7.0
Page 3
E-mail: vptsales@vptpower.com
SVTR2800S Series
3.2 PERFORMANCE SPECIFICATIONS
Tcase = -55 °C to +125 °C, Vin = +28 V ± 5%, Full Load, Unless Otherwise Specified
SVTR2808S
SVTR2812S
Parameter
INPUT
Conditions
Min
Typ
Max
Min
Typ
Max
Units
Voltage
Continuous
15
28
-
50
80
15
-
28
-
50
80
V
2
-
V
Transient, 1 sec
INH < 1.5 V
No Load
Current
-
-
4
6
-
4
6
mA
mA
mApp
V
65
30
-
90
-
60
30
-
90
Ripple Current
20 Hz to 10 MHz
Turn-On
-
50
-
50
Undervoltage Lockout
12.0
11.0
14.8
14.5
12
11
14.8
14.5
2
-
-
V
Turn-Off
OUTPUT STATIC
Voltage
Tcase = 25 °C
7.92
7.88
8
8
8.08
8.12
11.88
11.70
12
12
12.12
12.30
V
Tcase = -55 °C to +125 °C
V
4
0
0
-
-
35
0
0
-
-
40
W
Power
4
4.38
3.33
A
Current
Ripple Voltage
20 Hz to 10 MHz
Vin = 15 V to 50V
No Load to Full Load
-
-
-
30
2
50
20
50
-
-
-
20
2
50
20
50
mVpp
mV
mV
W
Line Regulation
Load Regulation
2
10
2
Load Fault Power Dissipation
-
-
-
-
16
16
-
-
-
-
14
14
Overload
Short Circuit
W
OUTPUT DYNAMIC
Load Step, Half to Full Load
Output Transient
-
-
110
60
500
500
500
-
-
-
450
200
500
700
500
900
mVpk
µs
1
Recovery
2
Output Transient
250
mVpk
Line Step , Vin = 16V to 40 V
1
250
10
0
500
20
-
-
-
300
10
0
500
20
µs
Recovery
Turn-On, Vin = 0 to 28 V
Delay
-
-
ms
Overshoot
25
50
mVpk
FUNCTION
2
Output Inhibited
Output Enabled
0
9
-
11
-
1.5
13
0
9
-
11
-
1.5
13
V
INH Pin Input
2
V
INH Pin Open Circuit Voltage
SYNC Frequency Range
GENERAL
500
600
500
600
kHz
Efficiency
75
79
-
76
83
-
%
2
-
-
1000
550
-
-
-
500
550
-
µF
Capacitive Load
Switching Frequency
Isolation
400
525
400
525
kHz
MΩ
g
500 V DC, Tcase = 25 °C
Non-flanged package option
Flanged package option
SF @ Tcase = 55 °C
100
-
100
-
Weight
-
-
-
-
-
52
55
-
-
-
-
-
-
52
55
-
g
MTBF (MIL-HDBK-217F)
752
752
kHr
3
POST-RAD END-OF-LIFE LIMITS
Input Ripple Current
-
-
-
70
-
-
-
70
mApp
V
Output Voltage
Tcase = -55 °C to +125 °C
7.8
8.2
11.66
12.3
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
SVTR2800S - 7.0
Page 4
E-mail: vptsales@vptpower.com
SVTR2800S Series
3.2 PERFORMANCE SPECIFICATIONS
Tcase = -55 °C to +125 °C, Vin = +28 V ± 5%, Full Load, Unless Otherwise Specified
SVTR2815S
Parameter
INPUT
Conditions
Min
Typ
Max
Units
Voltage
Continuous
15
-
28
-
50
80
V
2
V
Transient, 1 sec
INH < 1.5 V
No Load
Current
-
4
6
mA
mA
mApp
V
-
60
30
-
90
Ripple Current
20 Hz to 10 MHz
Turn-On
-
50
Undervoltage Lockout
12
11
14.8
14.5
2
-
V
Turn-Off
OUTPUT STATIC
Voltage
Tcase = 25 °C
14.85
14.625
0
15
15
-
15.15
15.375
40
V
Tcase = -55 °C to +125 °C
V
4
W
Power
4
0
-
-
20
2
2.67
50
A
Current
Ripple Voltage
20 Hz to 10 MHz
Vin = 15 V to 50V
No Load to Full Load
mVpp
mV
mV
W
Line Regulation
-
20
Load Regulation
-
10
-
50
2
Load Fault Power Dissipation
-
14
Overload
Short Circuit
-
-
14
W
OUTPUT DYNAMIC
Load Step, Half to Full Load
Output Transient
-
-
-
500
150
500
700
500
900
mVpk
µs
1
Recovery
2
Output Transient
mVpk
Line Step , Vin = 16V to 40 V
1
-
-
-
300
10
0
500
20
µs
Recovery
Turn-On, Vin = 0 to 28 V
Delay
ms
Overshoot
50
mVpk
FUNCTION
2
Output Inhibited
Output Enabled
0
9
-
11
-
1.5
13
V
INH Pin Input
2
V
INH Pin Open Circuit Voltage
SYNC Frequency Range
GENERAL
500
600
kHz
Efficiency
77
-
85
-
-
%
2
500
µF
Capacitive Load
Switching Frequency
Isolation
400
525
550
-
kHz
MΩ
g
500 V DC, Tcase = 25 °C
Non-flanged package option
Flanged package option
SF @ Tcase = 55 °C
100
-
Weight
-
-
-
-
-
52
55
-
g
MTBF (MIL-HDBK-217F)
752
kHr
3
POST-RAD END-OF-LIFE LIMITS
Input Ripple Current
-
-
-
70
mApp
V
Output Voltage
Tcase = -55 °C to +125 °C
14.565
15.4
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
SVTR2800S - 7.0
Page 5
E-mail: vptsales@vptpower.com
Web: www.vptpower.com
SVTR2800S Series
4.0 PERFORMANCE CURVES
4.1.1 SVTR283R3S Efficiency (Typical, 25 °C)
4.1.2 SVTR2805S Efficiency (Typical, 25 °C)
74
80
76
72
68
64
60
56
70
66
62
58
54
50
15 V
28 V
50 V
15 V
28 V
50 V
0
5
10
15
20
0
10
20
30
Output Power (W)
Output Power (W)
4.1.3 SVTR2808S Efficiency (Typical, 25 °C)
4.1.4 SVTR2812S Efficiency (Typical, 25 °C)
80
86
76
72
68
64
60
56
82
78
74
70
66
62
15 V
28 V
50 V
15 V
28 V
50 V
0
10
20
30
0
10
20
30
40
Output Power (W)
Output Power (W)
4.1.5 SVTR2815S Efficiency (Typical, 25 °C)
86
82
78
74
70
66
62
15 V
28 V
50 V
0
10
20
30
40
Output Power (W)
Sales Information
Phone:(425) 353-3010
E-mail: vptsales@vptpower.com
Fax: (425) 353-4030
SVTR2800S - 7.0
Page 6
Web: www.vptpower.com
SVTR2800S Series
5.0 MECHANICAL OUTLINES AND PINOUT
Non-Flanged Package Option:
1. Tolerances are +0.005” unless otherwise stated
2. Case temperature is measured on the center of the baseplate surface
3. Materials: Case (Steel, gold over nickel plated); Cover (Kovar, nickel plated); Pin (Copper-cored alloy 52, gold over nickel plated); Pin Seals (Ceramic)
Pin Function
Pin Function
Pin Function
Pin Function
1
2
3
28VIN
INH
-S
4
5
6
OUTCOM
+VOUT
+S
7
8
9
CASE
CASE
SYNC
10
INCOM
Sales Information
Phone:(425) 353-3010
Fax: (425) 353-4030
Web: www.vptpower.com
SVTR2800S - 7.0
Page 7
E-mail: vptsales@vptpower.com
SVTR2800S Series
5.0 MECHANICAL OUTLINES AND PINOUT (CONTINUED)
Flanged Package Option:
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 6-32
4. Materials: Case (Steel, gold over nickel plated); Cover (Kovar, nickel plated); Pin (Copper-cored alloy 52, gold over nickel plated); Pin Seals (Ceramic)
Pin Function
Pin Function
Pin Function
Pin Function
1
2
3
28VIN
INH
-S
4
5
6
OUTCOM
+VOUT
+S
7
8
9
CASE
CASE
SYNC
10
INCOM
Sales Information
Phone:(425) 353-3010
Fax: (425) 353-4030
Web: www.vptpower.com
SVTR2800S - 7.0
Page 8
E-mail: vptsales@vptpower.com
SVTR2800S 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 SVTR2800S Series is an isolated, single output, flyback 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 SVTR2800S 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 SVTR2812S 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 SVTR2812S converters can be stacked to provide a 24 V output at 80 W.
6.2 FUNCTION DESCRIPTIONS
6.2.1 On/Off Control (Inhibit)
1
2
28VIN
The INH (Inhibit) pin is a primary-side control pin referenced to INCOM. The INH
pin must be driven using an open collector or open drain configuration. Pulling the
INH 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 INH 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 INH to INCOM may be used to delay turn-on. The INH pin should be left
open if not used.
10K
12V
INH
BIAS
OPTIONAL
CAPACITOR
INCOM 10
Sales Information
Phone:(425) 353-3010
Fax: (425) 353-4030
SVTR2800S - 7.0
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Web: www.vptpower.com
SVTR2800S Series
5
+VOUT
6.2.2 Adjusting the Output Voltage (+S)
The output voltage set point of the converter can be adjusted using the +S pin.
To adjust the output up, connect the trim resistor from +S to OUTCOM. The
maximum trim range is +10% from nominal. The appropriate resistor values
versus the output voltage are given in the table below. Because the +S pin can
be sensitive to external noise, the trim resistor should be located close to the
SVTR converter with short interconnects. When adjusting the output voltage, do
not exceed the rated total output power or output current. The –S pin should be
connected to the OUTCOM pin.
100
10K
Ri
6
+S
Rtrim
-
+
+
-
2.5V
-S
3
4
100
OUTCOM
SVTR283R3S
SVTR2805S
SVTR2808S
SVTR2812S
SVTR2815S
+Vout (V)
Rtrim (Ω)
1.13k
1.36k
1.72k
2.32k
3.59k
7.87k
—
+ Vout (V)
Rtrim (Ω)
1.05k
1.18k
1.33k
1.54k
1.82k
2.22k
2.86k
4.00k
6.67k
20.0k
—
+ Vout (V)
Rtrim (Ω)
1.07k
1.24k
1.47k
1.80k
2.32k
3.27k
5.52k
+ Vout (V)
Rtrim (Ω)
1.09k
1.19k
1.33k
1.49k
1.70k
1.98k
2.38k
2.96k
3.94k
5.86k
11.4k
+ Vout (V)
Rtrim (Ω)
1.09k
1.18k
1.28k
1.40k
1.54k
1.71k
1.94k
2.22k
2.61k
3.16k
4.00k
8.8
8.7
8.6
8.5
8.4
8.3
8.2
8.1
8.0
3.60
3.55
3.50
3.45
3.40
3.35
3.30
5.50
5.45
5.40
5.35
5.30
5.25
5.20
5.15
5.10
5.05
5.00
13.2
13.1
13.0
12.9
12.8
12.7
12.6
12.5
12.4
12.3
12.2
16.5
16.4
16.3
16.2
16.1
16.0
15.9
15.8
15.7
15.6
15.5
17.8k
—
12.1
12.0
242k
15.4
15.3
15.2
15.1
15.0
5.46k
8.57k
20.0k
Note 1
—
—
1. Connect Rtrim = 400Ω from +VOUT (PIN 5) to +S (PIN 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 (SYNC)
The SVTR2800S 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 SVTR2800S Series provides a
frequency synchronization input (SYNC) referenced to INCOM.
The SYNC pin can be driven by an external clock. The internal clock and internal power train will operate at the frequency applied to the
SYNC pin. The SYNC 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 SYNC 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 be located
physically close together and share a low impedance INCOM connection. The SYNC pin can be left open or connected to INCOM if not
used.
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SVTR2800S Series
6.3 PROTECTION FEATURES
6.3.1 Input Undervoltage Lockout
The SVTR2800S 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.
6.3.2 Output Soft Start
The SVTR2800S 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 8 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 SVTR2800S 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 SVTR2800S 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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SVTR2800S 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) 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 tested 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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SVTR2800S 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
●
●
●
●
Hermeticity
(Seal)
TM1014, Gross Leak,
Condition C
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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SVTR2800S Series
8.0 STANDARD MICROCIRCUIT DRAWING (SMD) NUMBERS
Standard Microcircuit SVTR2800S Series
Drawing Number Similar Part Number
5962P1122001HXC
5962P1122001HXA
5962P1122001HYC
5962P1122001HYA
5962P1122001KXC
5962P1122001KXA
5962P1122001KYC
5962P1122001KYA
SVTR283R3S/H+
SVTR283R3S/H+-E
SVTR283R3SF/H+
SVTR283R3SF/H+-E
SVTR283R3S/K
SVTR283R3S/K-E
SVTR283R3SF/K
SVTR283R3SF/K-E
5962P1122002HXC
5962P1122002HXA
5962P1122002HYC
5962P1122002HYA
5962P1122002KXC
5962P1122002KXA
5962P1122002KYC
5962P1122002KYA
SVTR2805S/H+
SVTR2805S/H+-E
SVTR2805SF/H+
SVTR2805SF/H+-E
SVTR2805S/K
SVTR2805S/K-E
SVTR2805SF/K
SVTR2805SF/K-E
5962P1122003HXC
5962P1122003HXA
5962P1122003HYC
5962P1122003HYA
5962P1122003KXC
5962P1122003KXA
5962P1122003KYC
5962P1122003KYA
SVTR2812S/H+
SVTR2812S/H+-E
SVTR2812SF/H+
SVTR2812SF/H+-E
SVTR2812S/K
SVTR2812S/K-E
SVTR2812SF/K
SVTR2812SF/K-E
5962P1122004HXC
5962P1122004HXA
5962P1122004HYC
5962P1122004HYA
5962P1122004KXC
5962P1122004KXA
5962P1122004KYC
5962P1122004KYA
SVTR2815S/H+
SVTR2815S/H+-E
SVTR2815SF/H+
SVTR2815SF/H+-E
SVTR2815S/K
SVTR2815S/K-E
SVTR2815SF/K
SVTR2815SF/K-E
5962P1122005HXC
5962P1122005HXA
5962P1122005HYC
5962P1122005HYA
5962P1122005KXC
5962P1122005KXA
5962P1122005KYC
5962P1122005KYA
SVTR2808S/H+
SVTR2808S/H+-E
SVTR2808SF/H+
SVTR2808SF/H+-E
SVTR2808S/K
SVTR2808S/K-E
SVTR2808SF/K
SVTR2808SF/K-E
Do not use the SVTR2800S 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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SVTR2800S Series
9.0 ORDERING INFORMATION
SVTR
28
05
S
F
/K
-
XXX
1
2
3
4
5
6
7
(1)
(2)
(3)
(4)
(5)
(6)
(7)
Product
Series
Nominal Input
Voltage
Output Voltage
Number of
Outputs
Package Option
Screening
Additional
Screening
Code
Code1,2,3
SVTR
28 28 Volts
3R3 3.3 Volts
05 5 Volts
08 8 Volts
S
Single
(None)
Non-Flanged
Flanged
/EM Engineering Model
/H+ Class H + PIND
/K Class K
Contact Sales
F
12 12 Volts
15 15 Volts
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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SVTR2800S 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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