3509 데이터 시트보기 (PDF) - Linear Technology

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3509

Dual 36V, 700mA Step-Down Regulator

Linear Technology 

BLOCK DIAGRAM

LT3509

VIN

C1

COMMON

CIRCUITRY

OVERVOLTAGE

DETECT

RUN/SS1

C3 RUN/SS2

SHUTDOWN

AND

SOFT-START

CONTROL

C2

VREF AND

CORE

VOLTAGE

REGULATOR

SYNC

RT

OSCILLATOR

RT

1 OF 2 REGULATOR CHANNELS SHOWN

BD

BOOST

DIODE

VC

–

SLOPE

MAIN CURRENT

COMPARATOR

SWITCH

LOGIC

BOOST

SWITCH

DRIVER

POWER

SWITCH

SW

DA CURRENT

COMPARATOR

–17mV

DA

ERROR

AMPLIFIER

VREF

18mΩ

0.8V

FB

CLAMP

GND

NOTE: THE BD PIN

IS COMMON TO

BOTH CHANNELS

C4

L1

D1

R1

VOUT

C5

R2

3509 BD

Figure 1. Functional Block Diagram

3509fc

7

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