STRF6624 datasheet(10/16 Pages) ALLEGRO

Part #	STRF6624

Description	OFF-LINE QUASI-RESONANT FLYBACK SWITCHING REGULATORS

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Manufacturer	ALLEGRO [Allegro MicroSystems]

Direct Link	http://www.allegromicro.com

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10 / 16 page

Series STR-F6600

OFF-LINE

QUASI-RESONANT FLYBACK

SWITCHING REGULATORS

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

™

10

TM

Functional Description and Operation (cont’d)

Over-Voltage Protection Circuit

This feature of the STR-F66xx triggers the latch circuit

when the V

IN voltage (pin 4) exceeds 22.5 V (typ.).

Because the voltage on pin 4 is proportional to the output

voltage (they are linked by the transformer turns ratio), the

regulator protects the output against over-voltage. This

function is entirely independant of the output-voltage

regulation loop and indeed will protect against output

over-voltage should the voltage error signal be lost. The

measure of over-voltage is given by:

V

OUT(OVP) = VOUT(NOM) x VIN(OVP)/VIN(NOM)

where V

IN(OVP) is the drive voltage on pin 4.

In an over-voltage sensitive application, the drive

voltage can be set to close to 20 V and thus will protect the

output, if it rises more than 10% above nominal.

VOUT

IOUT

AC LOW

AC HIGH

Figure 10 – Power Supply Output

Overload Characteristics

60

40

20

60

100

140

LIMITED BY FRAME

TEMP. = +125

°C MAX.

RECOMMENDED MAX.

FRAME TEMP. = +115

°C

0

TEMPERATURE in

°C

Dwg. GK-0

CONTROLLER

0.8 W MAX.

MOUNTING SURFACE

TEMPERATURE

STR-F6676, 53 W MAX.

STR-F6672, 45 W MAX.

FREE AIR

ALL DEVICES

2.8 W MAX.

60

40

20

60

100

140

LIMITED BY FRAME

TEMP. = +125

°C MAX.

RECOMMENDED MAX.

FRAME TEMP. = +115

°C

0

TEMPERATURE in

°C

Dwg. GK-0

CONTROLLER

0.8 W MAX.

MOUNTING SURFACE

TEMPERATURE

STR-F6656, 56 W MAX.

STR-F6654, 55 W MAX.

STR-F6653, 48 W MAX.

STR-F6652, 43 W MAX.

FREE AIR

ALL DEVICES

2.8 W MAX.

STR-F665x

STR-F667x

ALLOWABLE PACKAGE POWER DISSIPATION

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STRF6624 Datasheet(PDF) 10 Page - Allegro MicroSystems

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