MHF+28515T/ES datasheet, PDF - EEWORLD Datasheet

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MHF+28515T/ES: DescriptionAnalog Circuit,; CategoryAnalog mixed-signal IC The signal circuit; File Size1MB，23 Pages; ManufacturerInterpoint （ Crane Aerospace & Electronics ）; Websitehttp://www.interpoint.com

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MHF+28515T/ES Overview

Analog Circuit,

MHF+28515T/ES Parametric

Parameter Name	Attribute value
Maker	Interpoint （ Crane Aerospace & Electronics ）
Parts packaging code	MODULE
package instruction	,
Contacts	9
Reach Compliance Code	unknown
Base Number Matches	1

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Crane aerospace & electronics Power solutions

MHF+ Single, dual and triple dC/dC Converters

28 VOlT inPuT – 15 WATT

Features

Only 0.33 inches (8.38 mm) high in a

hermetically sealed case

ModelS

dual

±5

±12

±15

•

input voltage 16 to 40 vdC

- MHF+281r9S 20 to 32 vdC

- triple output models16 to 48 vdC

•

transient protection

- Single and dual: 50 v for 50 ms

- triple: 80 v for 120 ms

•

Fully isolated

•

Fixed high frequency switching

•

operating temperature –55° to +125°C

VDC O

utput

Single

1.9

3.3

5.2

5.3

triPle

+5 & ±12

+5 & ±15

•

inhibit and synchronization functions

•

indefinite short circuit protection

•

up to 84% efficiency

the MHF+ Single and dual Series™ of high frequency dC/

dC converters offers a wide input voltage range of 16 to 40

volts (MHF+281r9S, 20 to 32 volts) and up to 15 watts of

output power. the units are capable of withstanding short

term transients up to 50 volts. the converters are offered with

standard screening, “eS” screening, or fully compliant to “883”

Mil-PrF-38534 Class H screening. Standard microcircuit

drawings (SMd) are available.

DESCRIPTION

MHF+ Single and dual dC/dC ConverterS

enabled when the pin, which is internally connected to a pull-up

resistor, is left unconnected or is connected to an open-collector

gate. the open circuit output voltage associated with the inhibit

pin is 8.5 to 12 v. in the inhibit mode, a maximum of 4 ma must

be sunk from the inhibit pin. See Figure 3.

ynChronization

onverter

esign

the MHF+ converters are switching regulators that use a

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

a constant switching frequency of 550 kHz typical. isolation

between input and output circuits is provided with a transformer

in the forward path and a temperature compensated optical link

in the feedback control loop. See Figure 1.

For the MHF+ dual output models, good cross regulation is

maintained by tightly coupled output magnetics. up to 90%

of the total output power (80% on 2805d) is available from

either output, providing the opposite output is simultaneously

carrying 10% of the total output power (20% on 2805d models).

Predictable current limit is accomplished by directly monitoring

the output load current and providing a constant current output

above the overload point.

an external synchronization feature is included that allows the

user to adjust the nominally 550 kHz operating frequency to

any frequency within the range of 500 kHz to 600 kHz. this is

initiated by applying a signal input of the desired frequency to

pin 5. the capacitively coupled sync input will synchronize on

a differential signal of as low as 4 volts to as high as 5 v. For

single and dual output models, if the sync function is not used,

connect the terminal to input common.

hort

irCuit

roteCtion

MHF+ Series single and dual output converters provide short

circuit protection by restricting the output current to approximately

115% of the

full load output current. the output current is sensed in the

secondary stage to provide highly predictable and accurate

current limiting, and to eliminate foldback characteristics.

nDervoltage

oCkout

nhibit

unCtion

MHF+ converters provide an inhibit terminal that can be used to

disable internal switching, resulting in no output current and very

low quiescent input current. the converter is inhibited when an

active low of ≤0.8 V is applied to the inhibit pin. The unit is

Crane aerospace & electronics

electronics group (interpoint Brand)

PO Box 97005 • Redmond WA 98073-9705

425.882.3100 • power@crane-eg.com

www.interpoint.com

undervoltage lockout prevents the single and dual output

converters from operating below approximately 14 vdC input

voltage to keep system current levels smooth, especially during

initialization or re-start operations.

Page 1 of 23

MHF+ rev l - 20091113

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