SMFLHP2805D INTERPOINT [Interpoint Corporation Company], SMFLHP2805D Datasheet

SMFLHP2805D

Manufacturer Part Number

SMFLHP2805D

Description

Parallel operation with current share, up to 3 units (228 watts)

Manufacturer

INTERPOINT [Interpoint Corporation Company]

Datasheet

1.SMFLHP2805D.pdf (13 pages)

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description

The 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 posi-

tive or negative outputs. Current sharing allows the units to be

paralleled for total power of up to 228 watts. The welded, hermet-

ically 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-

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.

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.

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.

Crane Aerospace & Electronics

Electronics group (Interpoint Brand)

PO Box 97005 • Redmond WA 98073-9705

425.882.3100 • electronics@craneae.com

www.craneae.com

Features

creening

eSign

Parallel operation with current share,

up to 3 units (228 watts)

•

-55° to +125°C operation

19 to 40 VDC input

50 V for 120 ms transient protection

Fully isolated, magnetic feedback

Fixed high frequency switching

Remote sense or 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

28 Volt input – 100 Watt

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

Cleared by u.S. DoD OSR for Public Release

Rev H - 20071221

Page 1 of 13

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 2 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. A low (<0.8 volts)

is required between INH1 (pin 4) and Input Common (pin 2) to

inhibit the converter. A 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 3). 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 3 shows the typical

setup for two or three units in parallel. 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 the TRI pin (pin 3)

of the master unit to be connected to the SNS RTN pin (pin 9).

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

SMFLHP converters are available at the load. Overload and short

circuit performance are not adversely affected during parallel

operation.

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Crane Aerospace & Electronics Power Solutions

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SMFLHP2805D Summary of contents

Page 1

Features Parallel operation with current share units (228 watts) • -55° to +125°C operation • VDC input • for 120 ms transient protection • Fully isolated, ...

Operating COnditiOns and CharaCteristiCs input Voltage range • VDC continuous • for 50 msec transient output power • 100 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) • 20 watts case operating temperature (tc) • –55 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 28V Inhibit Sync In www.craneae.com 28 Volt input – 100 Watt 1 Positive Input MSTR/INH2 + 2 ...

Page 5

Number of Outputs (S = single dual) SMFLHP28 base model Choose one from each of the following rows: V value out Number of outputs Case option Screening * Interpoint model numbers use ...

Page 6

Electrical Characteristics: –55°C to +125°C Tc, 28 VDC Vin, 100% load, free run, unless otherwise specified. SINgLE OuTPuT MODELS Parameter cOnDitiOnS OutPut VOltage tc = 25°c OutPut current OutPut ...

Page 7

... Effect on negative Vout from 50%/50% loads to 30%/70% or 70%/30% loads. 4. Effect on negative Vout from 50%/50% loads to 10% then 50% load on negative Vout www.craneae.com 28 Volt input – 100 Watt SMFLHP2805D cOnDitiOnS MIN TYP MAX MIN TYP MAX MIN + V 4.95 5.00 5.05 Out 4 ...

Page 8

... Typical Performance Curves: 25° VDC Vin, 100% load, free run, unless otherwise specified 19V 80 28V 75 40V Output (Watts) SMFLHP2805S & SMFLHP2805D Efficiency F 4 igure 0 100 Frequency (kHz) SMFLHP Series Audio Rejection F 7 igure Vin Vout 1ms/div ...

Page 9

... Vin Rise-time (µs) SMFLHP2815D Line Transient Response vs. Vin Rise-time F 16 igure www.craneae.com 28 Volt input – 100 Watt 8 6 SMFLHP2805D 4 2 SMFLHP2812D 0 – 2 SMFLHP2815D – 4 – 6 – Output Load (%) +Pout –Pout 30 to 70% ...

Page 10

U does not require designator in 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) ...

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 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 2001, ...

Page 13

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

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