LM2574YN 데이터 시트보기 (PDF) - Micrel

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LM2574YN

52kHz Simple 0.5A Buck Regulator

Micrel 

LM2574

Block Diagrams

Micrel, Inc.

VIN 1

FEED-

BACK

4

INTERNAL

REGULATOR

3.1k

FIXED GAIN

ERROR AMP

+

1.0k

-

COMPARATOR

+

-

ON/OFF

1/2 AMP

SWITCH

DRIVER

1.23V

BAND-GAP

REFERENCE

52 kHz

OSCILLATOR

RESET

THERMAL

SHUTDOWN

CURRENT

LIMIT

5 ON/OFF VIN 1

INTERNAL

REGULATOR

ON/OFF

FEED-

BACK 4

2 OUTPUT

FIXED GAIN

ERROR AMP

+

COMPARATOR

-

+

-

1/2 AMP

SWITCH

DRIVER

3 GND

1.23V

BAND-GAP

REFERENCE

52 kHz

OSCILLATOR

RESET

THERMAL CURRENT

SHUTDOWN

LIMIT

5 ON/OFF

2 OUTPUT

3 GND

Note: Pin numbers are for the TO-220 package

Fixed Regulator

Adjustable Regulator

July 2005

7

M9999-072805

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