SMFL Interpion semiconductor, SMFL Datasheet

SMFL

Manufacturer Part Number

SMFL

Description

Single and Dual DC/DC Converters

Manufacturer

Interpion semiconductor

Datasheet

1.SMFL.pdf (13 pages)

Current page: 1 of 13
Download datasheet (510Kb)

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 45 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, QML 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 transformer

in the forward path and a wide bandwidth magnetic coupling in the feed-

back control loop. The SMFL uses a unique dual loop feedback technique

that controls output current with an inner feedback 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 regulation is

achieved through a wide-bandwidth magnetic feedback circuit. The output

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

voltage by adding an external resistor.

•

creening

eSign

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

eatureS

sMFL single and dual dc/dc converters

28 VoLt input – 65 Watt

Rev H - 20061102

Page 1 of 13

The SMFL Series converters have two TTL compatible 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. An open collector TTL compatible low (<0.8 volts) is required to

inhibit the converter between INH1 (pin 4) and Input Common (pin 2). An

open collector TTL compatible low (<0.5 volts) is required to inhibit the

converter between INH2 (pin 12) and Output Common (pin 8). The appli-

cation 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.

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 perfor-

mance are not adversely affected during parallel operation.

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Crane Aerospace & Electronics Power Solutions

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Related parts for SMFL

SMFL Summary of contents

Page 1

... 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 ...

Page 2

... SINGLE OUTPUT MODELS CONNECTION DIAGRAMS - SENSE AND PARALLEL 28V Inhibit Sync In 28V Inhibit Sync In 28V Inhibit Sync In www.craneae.com 28 VoLt input – 65 Watt 1 Positive Input MSTR/INH2 + 2 Input Common – 3 TR1 Pos. Sense 4 INH1 Sense Return 5 Sync Out ...

Page 3

... SMFL2805S, SMFL2805D) case operating temperature (tc) • –55°C to +125°C full power derate output power/current • MFL283R3S: linearly from 100% at 100 °C to 80% at 125 °C output Voltage temperature coefficient • ...

Page 4

... PIN 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 Positive Sense 11 Slave 12 Master / Inhibit 2 www.craneae.com 28 VoLt input – 65 Watt dual output Positive Input ...

Page 5

... SMD for the numbers for other screening and RHA levels. For exact specifications for an SMD product, refer to the SMD drawing. Call your Interpoint representative for status on the SMFL SMD releases which are “in process.” SMDs can be down- loaded from: http://www.dscc.dla.mil/programs/smcr ...

Page 6

... Transition time > 10 µS. 5. Tested on release from inhibit. 6. Shall not compromise DC performance. 7. SMFL283R3S current and power are at 25°C only. Page Rev H - 20061102 Crane Aerospace & Electronics Power Solutions SMFL2812S SMFL2815S MAx MIN TYP MAx MIN TYP 5 ...

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 OutPut riPPle ± V Out line regulatiOn ...

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 & SMFL2805D Efficiency F 4 igure ...

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 & 15D SMFL2805S & SMFL2812S & 12D ...

Page 10

... Case Option position of model number. Angled corner indicates pin one. 1.505 (38.23) max. 1.380 (35.05) 1.250 (31.75) 1.050 (26.67) 0.850 (21.59) 0.650 (16.51) 0.450 (11.43) 0.250 (6.35) 0.120 (3.05) 0.000 www.craneae.com 28 VoLt input – 65 Watt TOP VIEW CASE U Flanged case, short-leaded ...

Page 11

... C H lass and e leMent t est ( CoMponent level 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 Wire Bond Evaluation SEM SLAM™ ...

Page 12

... QMl s lass and e s nvironMental Creening t p est erforMed ( end iteM level 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 ...

Page 13

... DSCC requirements SMFL Single and Dual, Rev H - 20061102. This revision supercedes all previous releases. All technical 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. SMFL Series is a trademark of Interpoint. Copyright © ...

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