smfl283r3s Interpoint Corp., smfl283r3s Datasheet

smfl283r3s

Manufacturer Part Number

smfl283r3s

Description

Smfl Single And Dual Dc/dc Converters

Manufacturer

Interpoint Corp.

Datasheet

1.SMFL283R3S.pdf (13 pages)

Current page: 1 of 13
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Crane Aerospace & Electronics

Electronics group (Interpoint Brand)

PO Box 97005 • Redmond Wa 98073-9705

425.882.3100 • electronics@craneae.com

www.craneae.com

Features

description

The SMFL Series™ 28-volt DC/DC converters are rated up to 65

watts output power over a -55° to +125°C temperature range with

a 28 Vdc nominal input. On dual output models up to 70% of the

rated output power can be drawn from either the positive or negative

outputs. Current sharing allows the units to be paralleled for total

power of up to 148 watts. The welded, hermetically sealed package

is only 3.0 x 1.5 x 0.40 inches, giving the series an overall power

density of up to 43 watts per cubic inch.

SMFL converters offer the following screening options: Space

Prototype (O), Class H, or Class K. Radiation tolerant to Radiation

Hardness Assurance (RHA) levels of “-” (O) or “R”, per MIL-STD-

38534. Interpoint model numbers use an “O” in the RHA designator

position to indicate the “-” (dash) Radiation Hardness Assurance

level of MIL-PRF-38534, which is defined as “no RHA”. See “Class H

and K, MIL-PRF-38534 Screening” tables for more information.

SMFL Series converters are switching regulators that use a quasi-

square wave, single ended forward converter design with a constant

switching frequency of 600 kHz typical.

Isolation between input and output circuits is provided with a trans-

former in the forward path and a wide bandwidth magnetic coupling

in the feedback control loop. The SMFL uses a unique dual loop

feedback technique that controls output current with an inner feed-

back loop and an output voltage with a cascaded voltage mode

feedback loop. The additional secondary current mode feedback loop

improves transient response in a manner similar to primary current

mode control and allows for ease of paralleling, but without the cost

and complexity.

The constant frequency, pulse-width modulated converters use a

quasi-square wave single-ended forward design. Tight load regula-

tion is achieved through a wide-bandwidth magnetic feedback circuit.

The output voltage on single SMFL models can be trimmed to a

• Fully qualified to Class H or K

• -55° to +125°C operation

• 16 to 40 VDC input

• Fully Isolated

• Magnetic feedback

• Fixed frequency, 600 kHz typical

• Topology – Single Ended Forward

• 50 V for up to 120 ms transient protection

• Inhibit input side and output side

• Sync function

• Output trim on single output models

• Indefinite short circuit protection

• Remote sense on single output models

• Up to 85% efficiency / 43 W/in

• Parallelable up to 148 watts

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sMFL single and dual dc/dc converters

28 VoLt input – 65 Watt

OSR case number 09S-0995, dated March 13, 2009.

Cleared by U.S. DoD OSR for Public Release

Rev H - 20071102

Page 1 of 13

specific output voltage by adding an external resistor (see Figure 1

for resistor values).

The SMFL Series converters have two inhibit terminals (INH1 and

INH2) that can be used to disable power conversion, resulting in

a very low quiescent input current and no generation of switching

noise. A logic low (<0.8 volts) is required to inhibit the converter

between INH1 (pin 4) and Input Common (pin 2). A logic low (<0.5

volts) is required to inhibit the converter between INH2 (pin 12) and

Output Common (pin 8). The application of intermediate voltages to

these pins (1.5 to 10.5 volts) should be avoided.

Converters may be synced to an external clock (525 to 675 kHz) or

to one another by using the sync in or out pins. The nominal free-run

switching frequency is 600 kHz (see Application Note titled “Inhibit

and Synchronization”).

Multiple single output SMFL converters may be used in parallel to

drive a common load. In this mode of operation the load current is

shared by two or three SMFL converters. In current sharing mode,

one SMFL converter is designated as a master. The SLAVE pin (pin

11) of the master is left unconnected and the MSTR/INH2 pin (pin

12) of the master is connected to the SLAVE pin (pin 11) of the slave

units. The units designated as slaves have the MSTR/INH2 pin (pin

12) connected to the SNS RTN pin (pin 9). Note that synchronizing

the units together is not required for current sharing operation. A

second slave unit may be placed in parallel with a master and slave;

this requires the TRI pin (pin 3) of the master unit to be connected to

the SNS RTN pin (pin 9). See Figure 2 for a block diagram of parallel

connections.

When paralleled, 76% of the total combined power ratings of the

SMFL converters are available at the load. Overload and short circuit

performance are not adversely affected during parallel operation.

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smfl283r3s Summary of contents

Page 1

Features • Fully qualified to Class • -55° to +125°C operation • VDC input • Fully Isolated • Magnetic feedback • Fixed frequency, 600 kHz typical • Topology – Single Ended Forward • for up to 120 ms transient protection • Inhibit input side and output side • Sync function • Output trim on single output models • Indefinite short circuit protection • Remote sense on single output models 3 • 85% efficiency / 43 W/in • Parallelable up to 148 watts description The ...

Page 2

Operating COnditiOns and CharaCteristiCs input Voltage range • VDC continuous • for 120 ms transient output power • watts depending on model Lead soldering temperature (10 sec per lead) • 300°C storage temperature range (case) • -65°C to +150°C power dissipation (pd) • 14 watts (16 watts SMFl2805S, SMFl2805D) case operating temperature (tc) • -55°C to +125°C full power ...

Page 3

OUt pin single output 1 Positive Input 2 Input Common 3 Triple (TRI) 4 Inhibit 1 (INH1) 5 Sync Out 6 Sync In 7 Positive Output 8 Output Common 9 Sense Return 10 ...

Page 4

OUtpUt mOdels COnneCtiOn diagrams - sense and parallel 28V Inhibit Sync In 28V Inhibit Sync In F igure 28V Inhibit Sync In www.craneae.com 28 VoLt input – 65 Watt 1 Positive Input MSTR/INH2 ...

Page 5

... Crane Aerospace & Electronics Power Solutions smd nUmbers S m SmFl S tanDarD iCrOCirCuit erieS D (SmD rawing imilar art IN PROCESS SMFL283R3S/HO 5962-9316302HxC SMFL2805S/HO 5962-9316202HxC SMFL2812S/HO 5962-9316102HxC SMFL2815S/HO IN PROCESS SMFL2805D/HO IN PROCESS SMFL2812D/HO 5962-9319302HxC SMFL2815D/HO / case option screening & RHA level and Z available by special order ...

Page 6

... Guaranteed by design, not tested. 2. Unit will shut down above approximately 45 V but will be undamaged and will restart when voltage drops into normal range. 3. Recovery time is measured from application of the transient to point at which Vout is within 1% of final value. www.craneae.com 28 VoLt input – 65 Watt SMFL283R3S SMFL2805S MIN TYP MAx MIN TYP 3.26 3.30 3.34 4.95 40 VDC 0 — ...

Page 7

Electrical Characteristics: -55°C to +125°C Tc, 28 VDC Vin, 100% load, RHA level O, unless otherwise specified. DUal OUTPUT MODElS parameter Output VOltage tC = 25°C 2 Output Current Output pOwer ...

Page 8

Typical Performance Curves: 25°C Tc, 28 VDC Vin, 100% load, free run, unless otherwise specified 16V 80 28V 75 40V Output (Watts) SMFL2805S & ...

Page 9

Typical Performance Curves: 25°C Tc, 28 VDC Vin, 100% load, free run, unless otherwise specified. 50% to 100% –Pout = 32.5W 100% to 50% 1ms/div SMFL2815D Step Load Response F 13 igure 16 SMFL2815S ...

Page 10

... Case U, Rev C, 20060302 Please refer to the numerical dimensions for accuracy. All information is believed to be accurate, but no responsibility is assumed for errors or omissions. Interpoint reserves the right to make changes in products or specifications without notice. Copyright © 1999-2006 Interpoint Corp. All rights reserved igure ...

Page 11

C H lass and COmpOnent-level test perfOrmed Element Electrical Element Visual Internal Visual Temperature Cycling Constant Acceleration Interim Electrical Burn-in Post Burn-in Electrical Steady State Life Voltage Conditioning Aging Visual Inspection Final Electrical 4 ...

Page 12

C H lass and end item-level test perfOrmed 2 Non-destruct bond pull Method 2023 Pre-cap Inspection Method 2017, 2032 Temperature Cycle (10 times) Method 1010, Cond. C, -65°C to 150°C, ambient Constant Acceleration Method ...

Page 13

C H lass and RadIatIon HaRdnEss assuRanCE lEvEls Standard, no radiation guarantee Radiation tolerant–Tested lots Rads (Si) total dose SEU guarantee ...

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