SVFL2800D_技术文档

SVFL2800D SERIES

SPACE QUALIFIED HYBRID DC-DC CONVERTERS

Models Available

Input: 16 V to 40 V continuous, 50 V transient

120 W, dual outputs of ±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 # 5962-11214

• 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: 88 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 single output DC-DC converter

• SVRFL 100 W dual 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

• EMI filters

• Non-isolated, space qualified point of load converters

• Use with Thermal Pad TP-001

• Undervoltage lockout

• Current limit protection / short circuit protection

Sales Information

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Fax: (425) 353-4030

Web: www.vptpower.com

SVFL2800D - 7.0

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SVFL2800D Series

2.0 DIAGRAMS

2.1 BLOCK DIAGRAM

+VOUT

OUTCOM

28VIN

-VOUT

TRIM

INCOM

Q1

VOLTAGE AND

CURRENT

AMPLIFIERS

MAGNETIC

FEEDBACK

UNDER

VOLTAGE

SHUTDOWN

SHARE

INH2

PRIMARY

HOUSEKEEPING

SUPPLY

PWM

CONTROL

SECONDARY

HOUSEKEEPING

SUPPLY

INH1

SYNCIN

SYNCOUT

2.2 CONNECTION DIAGRAM

DVME28 EMI FILTER

SVFL2800D DC-DC CONVERTER

12

11

1

2

3

1

6

4

7

9

28VIN

28VOUT

28VIN

SYNCIN

INH1

+VOUT

- VOUT

10

9

12

8

+

28 Vdc

INH2

LOAD

4

5

6

-

INCOM OUTCOM

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

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 50 V

1C

Lead Solder Temperature (10 seconds):

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SVFL2800D Series

3.2 PERFORMANCE SPECIFICATIONS

Tcase = -55 °C to +125 °C, Vin = +28 V ± 5%, Full Load¹, Unless Otherwise Specified

SVFL2805D

SVFL2812D

Parameter

INPUT

Conditions

Min

Typ

Max

Min

Typ

Max

Units

Voltage

Continuous

16

28

-

40

50

16

28

-

40

50

V

4

-

V

Transient, 1 sec

INH 1 < 1.5 V

INH 2 < 1 V

No Load

Current

-

1

3

-

1

3

mA

mApp

V

-

40

75

30

-

70

-

40

90

35

-

70

160

80

160

80

Ripple Current

20 Hz to 10 MHz

Turn-On

-

Undervoltage Lockout

14.5

13.5

16

14.5

13.5

16

4

-

15.5

-

15.5

V

Turn-Off

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

4.95

4.925

4.80

4.75

0

5

-

5.05

5.075

5.20

5.25

100

70

11.88

11.82

11.8

11.52

0

12

-

12.12

12.18

12.20

12.48

110

V

2,6

W

A

Power

Either Output

0

-

0

-

77

2,6

Total

0

-

20

0

-

9.17

Current

Either Output

0

-

14

80

0

-

6.4

80

A

Ripple Voltage

Line Regulation

20 Hz to 10 MHz

15

2

25

2

mVpp

mV

+Vout, V_IN= 16 V to 40 V

-Vout, V_IN= 16 V to 40 V

-

20

-

20

-

10

200

-

10

200

7

+Vout, No Load to Full Load

-Vout, No Load to Full Load

-

10

55

100

200

-

2

120

200

mV

Load Regulation

40

Cross Regulation, -Vout

+Vout: 30% load, -Vout: 70% load

+Vout: 70% load, -Vout: 30% load

-

260

450

-

220

450

mV

4

Load Fault Power Dissipation

-

50

-

50

W

Overload

Short Circuit

OUTPUT DYNAMIC

Load Step, Half to Full Load, Either Output

Output Transient

-

130

200

400

500

-

260

140

500

mVpk

µs

3

Recovery

4

Output Transient

-

300

600

-

600

1200

mVpk

Line Step , Vin = 16V to 40 V

3

-

300

5

500

20

-

300

5

500

20

µs

Recovery

Turn-On, Vin = 0 to 28 V

FUNCTION

Delay

ms

Overshoot

0

25

0

50

mVpk

4

Output Inhibited

Output Enabled

0

-

1.5

1

0

-

1.5

1

V

INH 1 Pin Input

4

INH 2 Pin Input

4

10.5

15

10.5

15

INH 1 Pin Open Circuit Voltage

4

-20

2

-

12

10

4

-20

2

-

12

10

4

V

INH 2 Pin Open Circuit Voltage

Voltage Trim Range

%

4

V

SHARE Pin Voltage

SYNC Frequency Range

500

600

500

600

kHz

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

6. Derate linearly to 0 at 135 °C

7. 5% load to Full Load at -55 °C

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SVFL2800D Series

3.2 PERFORMANCE SPECIFICATIONS (CONTINUED)

Tcase = -55 °C to +125 °C, Vin = +28 V ± 5%, Full Load¹, Unless Otherwise Specified

SVFL2805D

SVFL2812D

Parameter

GENERAL

Efficiency

Conditions

Min

Typ

Max

Min

Typ

Max

Units

73

79

-

500

600

-

79

85

-

500

600

-

%

4

-

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

-

88

-

88

-

MTBF (MIL-HDBK-217F)

-

727

-

727

kHr

5

POST-RAD END-OF-LIFE LIMITS

Input Ripple Current

-

140

5.10

-

140

mApp

Output Voltage

+Vout, Tcase = -55 °C to +125 °C

-Vout, Tcase = -55 °C to +125 °C

4.89

4.715

11.66

11.36

12.28

12.58

V

5.275

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

6. Derate linearly to 0 at 135 °C

7. 5% load to Full Load at -55 °C

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SVFL2800D Series

3.2 PERFORMANCE SPECIFICATIONS (CONTINUED)

Tcase = -55 °C to +125 °C, Vin = +28 V ± 5%, Full Load¹, Unless Otherwise Specified

SVFL2815D

Parameter

INPUT

Conditions

Min

Typ

Max

Units

Voltage

Continuous

16

28

40

V

4

-

1

50

3

V

Transient, 1 sec

INH 1 < 1.5 V

INH 2 < 1 V

No Load

Current

-

mA

mApp

V

-

40

110

40

-

70

160

80

16

-

Ripple Current

20 Hz to 10 MHz

Turn-On

Undervoltage Lockout

14.5

4

13.5

-

15.5

V

Turn-Off

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

14.85

14.775

14.80

14.40

0

15

-

15.15

15.225

15.20

15.60

120

V

W

2,6

Power

Either Output

Total

0

-

84

8

W

A

2,6

Current

Either Output

0

-

5.6

80

A

Ripple Voltage

Line Regulation

20 Hz to 10 MHz

30

2

mVpp

mV

+Vout, V_IN= 16 V to 40 V

-Vout, V_IN= 16 V to 40 V

-

20

-

10

200

7

+Vout, No Load to Full Load

-Vout, No Load to Full Load

-

2

120

200

mV

Load Regulation

30

Cross Regulation, -Vout

+Vout: 30% load, -Vout: 70% load

+Vout: 70% load, -Vout: 30% load

-

200

450

mV

4

Load Fault Power Dissipation

-

50

W

Overload

Short Circuit

OUTPUT DYNAMIC

Load Step, Half to Full Load, Either Output

Output Transient

-

260

110

500

mVpk

µs

3

Recovery

4

Output Transient

-

600

1200

mVpk

Line Step , Vin = 16V to 40 V

3

-

300

5

500

20

µs

Recovery

Turn-On, Vin = 0 to 28 V

FUNCTION

Delay

ms

Overshoot

0

50

mVpk

4

Output Inhibited

Output Enabled

0

-

1.5

1

V

INH 1 Pin Input

4

V

INH 2 Pin Input

4

10.5

4

15

12

10

4

V

INH 1 Pin Open Circuit Voltage

4

V

INH 2 Pin Open Circuit Voltage

Voltage Trim Range

-20

2

%

V

4

SHARE Pin Voltage

SYNC Frequency Range

500

600

kHz

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

6. Derate linearly to 0 at 135 °C

7. 5% load to Full Load at -55 °C

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SVFL2800D Series

3.2 PERFORMANCE SPECIFICATIONS (CONTINUED)

Tcase = -55 °C to +125 °C, Vin = +28 V ± 5%, Full Load¹, Unless Otherwise Specified

SVFL2815D

Parameter

GENERAL

Efficiency

Conditions

Min

Typ

Max

Units

80

85

-

500

600

-

%

4

-

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

-

88

-

MTBF (MIL-HDBK-217F)

-

727

kHr

5

POST-RAD END-OF-LIFE LIMITS

Input Ripple Current

-

140

mApp

Output Voltage

+Vout, Tcase = -55 °C to +125 °C

-Vout, Tcase = -55 °C to +125 °C

14.565

14.19

15.355

15.73

V

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

6. Derate linearly to 0 at 135 °C

7. 5% load to Full Load at -55 °C

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SVFL2800D Series

4.0 PERFORMANCE CURVES

4.1.1 SVFL2805D Efficiency (Typical, 25 °C)

4.1.2 SVFL2812D Efficiency (Typical, 25 °C)

84

88

84

80

76

72

68

80

76

72

68

64

16 V

28 V

40 V

16 V

28 V

40 V

0

20

40

60

80

100

0

20

40

60

80

100

120

Output Power (W)

4.1.3 SVFL2815D Efficiency (Typical, 25 °C)

88

84

80

76

72

68

16 V

28 V

40 V

0

20

40

60

80

100

120

Output Power (W)

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SVFL2800D Series

4.0 PERFORMANCE CURVES (CONTINUED)

4.2.1 SVFL2805D Cross-Regulation (Typical, 25 °C)

4.2.2 SVFL2812D Cross-Regulation (Typical, 25 °C)

-4.2

-11.5

-12.0

-12.5

-13.0

-13.5

-14.0

-14.5

-15.0

-4.6

-5.0

-5.4

-5.8

2.00 A

0.92 A

2.75 A

4.58 A

6.42 A

6.00 A

-6.2

10.0 A

14.0 A

-6.6

0

2

4

6

8

10

12

14

0

1

2

3

4

5

6

7

-Iout (A)

4.2.3 SVFL2815D Cross-Regulation (Typical, 25 °C)

-14.0

-15.0

-16.0

-17.0

0.80 A

-18.0

-19.0

2.40 A

4.00 A

5.60 A

0

1

2

3

4

5

6

-Iout (A)

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SVFL2800D 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 screw

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

1

2

3

28VIN

INCOM

CASE

4

5

6

INH1

7

8

9

+VOUT

OUTCOM

-VOUT

10

11

12

TRIM

SYNCOUT

SYNCIN

SHARE

INH2

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SVFL2800D 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 screw

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

1

2

3

28VIN

INCOM

CASE

4

5

6

INH1

7

8

9

+VOUT

OUTCOM

-VOUT

10

11

12

TRIM

SYNCOUT

SYNCIN

SHARE

INH2

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SVFL2800D 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 SVFL2800D Series is an isolated dual-output forward converter. It provides a positive and negative output voltage with respect to

the OUTCOM pin. Up to 70% of the total output power is available from either output. The internal voltage regulation loop actively

regulates the positive output using VPT’s proprietary magnetic feedback technology. The negative output is regulated by cross-

regulation. The negative output is well-regulated for balanced load conditions. For unbalanced load conditions, refer to the cross

regulation performance graphs in Section 4.2 for expected performance. For a balanced or near-balanced load condition, the converter

will regulate down to zero load, and no minimum load is required. For an unbalanced load condition, with negative loads greater than

10%, a minimum load of 10% is recommended on the positive output.

6.1.2 External Components

The SVFL2800D 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 outputs can be used as a traditional dual-output, with a positive and negative voltage referenced to

OUTCOM, or as a single-ended output referenced to –VOUT or +VOUT. For example, the SVFL2812D model can provide +12 V and

–12 V in the traditional dual output configuration, or can provide +24 V referenced to –VOUT, or –24 V referenced to +VOUT in single-

ended configuration. In the single-ended configuration, the OUTCOM pin will be at +12 V relative 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 SVFL2812D converters can be stacked to provide a 48 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 IN COM. 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.

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SVFL2800D Series

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.

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. 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.

Rtrim

10K

(TRIM DOWN)

10 TRIM

-

Rt

+

Rtrim

(TRIM UP)

Ri

+

-

2.5V

8

9

OUTCOM

-VOUT

SVFL2805D

SVFL2812D

SVFL2815D

+Vout (V)

Rtrim (Ω)

35.0k

47.5k

68.3k

110k

+ Vout (V)

Rtrim (Ω)

5.80k

10.0k

16.2k

26.6k

47.3k

109k

+ 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)

1.70k

5.00k

10.0k

18.3k

35.0k

85.0k

—

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

235k

—

225k

—

100k

454k

475k

58.3k

37.5k

25.0k

16.7k

10.7k

6.30k

2.80k

short

213k

225k

134k

142k

94.0k

70.1k

54.3k

42.9k

34.4k

27.8k

22.5k

18.2k

14.6k

100k

75.0k

58.3k

46.4k

37.5k

30.6k

25.0k

20.5k

16.7k

9.6

6.2.3 Frequency Synchronization (SYNCIN, SYNCOUT)

The SVFL2800D 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 SVFL2800D 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 SYNC IN 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.

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.

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SVFL2800D Series

6.2.4 Parallel Operation (SHARE)

The SVFL2800D Series provides a SHARE function for active current sharing among paralleled modules. For the dual output model,

the SHARE function is only applicable in the single-ended output configuration (see section 6.1.4) where no current is drawn from the

OUTCOM pin. 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

SVFL2800D DC-DC CONVERTER

1

2

3

4

5

6

12

11

10

9

1

7

28VIN

28VOUT

28VIN

SYNCIN

INH1

+VOUT

SHARE

11

6

8

+

28 Vdc

OUTCOM

4

5

2

-

INCOM OUTCOM

8

SYNCOUT

INCOM

7

9

-VOUT

CASE

SVFL2800D DC-DC CONVERTER

1

7

28VIN

SYNCIN

INH1

+VOUT

SHARE

11

6

8

OUTCOM

4

5

2

SYNCOUT

INCOM

9

-VOUT

CASE

SVFL2800D DC-DC CONVERTER

1

6

4

7

28VIN

SYNCIN

INH1

+VOUT

SHARE

11

8

9

OUTCOM

2

INCOM

-VOUT

CASE

6.3 PROTECTION FEATURES

6.3.1 Input Undervoltage Lockout

The SVFL2800D 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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SVFL2800D Series

6.3.2 Output Soft Start

The SVFL2800D 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 SVFL2800D 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 total output current to approximately 125% its rated value. The

current limit protection circuit limits the sum of output currents in both +Vout and -Vout. It does not distinguish if the current is on the

positive or negative output. 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 SVFL2800D 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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SVFL2800D 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 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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SVFL2800D 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-QML^1,6

MIL-STD-883 Test

Method, Condition

Test

(Class H + PIND)

(Class K)

Non-Destructive

Bond Pull

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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SVFL2800D Series

8.0 STANDARD MICROCIRCUIT DRAWING (SMD) NUMBERS

Standard Microcircuit SVFL2800D Series

Drawing Number Similar Part Number

SVFL2805D/H+

SVFL2805D/H+-E

SVFL2805DF/H+

SVFL2805DF/H+-E

SVFL2805D/K

SVFL2805D/K-E

SVFL2805DF/K

SVFL2805DF/K-E

5962P1121401HXC

5962P1121401HXA

5962P1121401HYC

5962P1121401HYA

5962P1121401KXC

5962P1121401KXA

5962P1121401KYC

5962P1121401KYA

SVFL2812D/H+

SVFL2812D/H+-E

SVFL2812DF/H+

SVFL2812DF/H+-E

SVFL2812D/K

SVFL2812D/K-E

SVFL2812DF/K

SVFL2812DF/K-E

5962P1121402HXC

5962P1121402HXA

5962P1121402HYC

5962P1121402HYA

5962P1121402KXC

5962P1121402KXA

5962P1121402KYC

5962P1121402KYA

SVFL2815D/H+

SVFL2815D/H+-E

SVFL2815DF/H+

SVFL2815DF/H+-E

SVFL2815D/K

SVFL2815D/K-E

SVFL2815DF/K

SVFL2815DF/K-E

5962P1121403HXC

5962P1121403HXA

5962P1121403HYC

5962P1121403HYA

5962P1121403KXC

5962P1121403KXA

5962P1121403KYC

5962P1121403KYA

Do not use the SVFL2800D 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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SVFL2800D Series

9.0 ORDERING INFORMATION

SVFL

28

05

D

F

/K

-

XXX

1

2

3

4

5

6

7

(1)

Product

Series

(2)

(3)

(4)

Number of

Outputs

(5)

(6)

(7)

Nominal Input

Voltage

Output Voltage

Package Option

Screening Code^1,2,3

Additional

Screening

Code

SVFL

28 28 Volts

05 5 Volts

12 12 Volts

15 15 Volts

D

Dual

(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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SVFL2800D 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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型号：	SVFL2800D
厂家：	VPT, Inc.
描述：	SPACE QUALIFIED HYBRID DC-DC CONVERTERS DC-DC转换器
文件：	总19页 (文件大小：884K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

SVFL2800D [VPT]

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