smflhp283r3s/kr Interpoint Corp., smflhp283r3s/kr Datasheet

smflhp283r3s/kr

Manufacturer Part Number

smflhp283r3s/kr

Description

Smflhp Single And Dual Dc/dc Converters

Manufacturer

Interpoint Corp.

Datasheet

1.SMFLHP283R3SKR.pdf (14 pages)

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description

The Interpoint™ SMFLHP Series™ 28 volt DC/DC converters

are rated up to 100 watts output power over a -55°C 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 285 watts. The

welded, hermetically sealed package is only 3.005 x 1.505 x

0.400 inches, giving the series an overall power density of up to

67 watts per cubic inch.

SMFLHP converters offer screening options to Space Prototype

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

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

MIL-PRF-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 Screening Tables 1 and 2 for more

information.

The SMFLHP Series converters are switching regulators that use

a quasi-square wave, single ended forward converter design with

a constant switching frequency of 600 kHz.

Isolation between input and output circuits is provided with a

transformer in the forward path and wide bandwidth magnetic

coupling in the feedback control loop. The SMFLHP Series

uses a unique dual loop feedback technique that controls output

current with an inner feedback loop and output voltage with a

cascaded voltage mode feedback loop.

Features

Crane Aerospace & Electronics

Crane Electronics, Inc.

Power Solutions – Interpoint

PO Box 97005 • Redmond, WA 98073-9705

425.882.3100 • power@crane-eg.com

www.craneae.com/interpoint

creening

eSign

Parallel operation with current share,

up to 3 units (up to 285 watts)

•

Operating temperature -55° to +125°C

Qualified to MIL-PRF-38534 Class H and K

Radiation hardness assurance (RHA) to level R 100 kRad(Si)

Input voltage range 19 to 40 VDC

Transient protection 80 V for 50 ms

Fully isolated, magnetic feedback

Fixed high frequency switching

Remote sense / output trim on single output models

Inhibit function

Synchronization input and output

Indefinite short circuit protection

High power density with up to 87% efficiency

eatureS

smFlHp single and dual dc/dc converters

The information in this document is a derivative of documents cleared by the Department

of Defense (DoD) Office of Security Review (OSR) for public release. OSR case numbers

09-S-1007 dated March 13, 2009 and 09-S-1960 dated June 22, 2009.

28 Volt input – 100 Watt

Rev J - 2011.05.04

Page 1 of 14

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.

Tight load regulation is achieved through a wide-bandwidth

magnetic feedback circuit. The output voltage on single SMFLHP

models can be easily trimmed up by adding an external resistor.

(See Figure 1 for voltage changes with different resistor values.)

The SMFLHP 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. An active low

(<0.8 volts) is required between INH1 (pin 4) and Input Common

(pin 2) to inhibit the converter. An active low (<0.5 volts) is

required between INH2 (pin 12) and Output Common (pin 8) to

inhibit the converter. The application of intermediate voltages to

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

Multiple SMFLHP converters may be used in parallel to drive

a common load (see Figure 2). Only single output models with

SENSE and SNS RTN can be used in the share mode. In this

mode of operation the load current is shared by two or three

SMFLHP converters. In current sharing mode, one SMFLHP

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) of the master unit.

Figure 2 shows the typical setup for two or three units in parallel.

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Crane Aerospace & Electronics Power Solutions

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Related parts for smflhp283r3s/kr

smflhp283r3s/kr Summary of contents

Page 1

Features Parallel operation with current share units (up to 285 watts) • Operating temperature -55° to +125°C • Qualified to MIL-PRF-38534 Class H and K • Radiation hardness assurance (RHA) to ...

Note that synchronizing the units together (though shown in the figure) is not required for current sharing operation. A second slave unit may be placed in parallel with a master and slave; this requires ...

Page 3

Inhibit Sync In 28V Inhibit Sync ncreaSe Out V OltS 0.1 0.2 0.3 0.4 0.5 F igure 28V Inhibit Sync ...

Page 4

Positive Input Positive Input 2 Input Common Input Common 3 Triple (TR1) Triple (TR1) 4 Inhibit 1 (INH1) Inhibit 1 (INH1) 5 Sync Out Sync Out ...

Page 5

... Number of Outputs 3r3, 05, 12 05, 12 Page Rev J - 2011.05.04 Crane Aerospace & Electronics Power Solutions smd numbers S M SMFLHp S tanDarD iCrOCirCuit D (SMD) S rawing iMiLar 5962R0620901KxC SMFLHP283R3S/KR 5962R0822301KxC SMFLHP2815D/KR . ___________ / 2 4 Case/Lead Screening 3 Options o (u, leave blank erieS p art ...

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smflhp283r3s/kr Interpoint Corp., smflhp283r3s/kr Datasheet

smflhp283r3s/kr

Related parts for smflhp283r3s/kr

smflhp283r3s/kr Summary of contents

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