LT3742 Просмотр технического описания (PDF) - Linear Technology

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Компоненты Описание

производитель

LT3742

Dual, 2-Phase Step-Down Switching Controller

Linear Technology 

Block Diagram

VIN

SHDN

PGOOD

25 GND

2 VIN

UVLO

3

SWB

5

BIAS

4

1.25V

UNDERVOLTAGE

+ LOCKOUT

GATE DRIVE BIAS

BOOST REGULATOR

BIAS

–

3µA

UVLO

THERMAL

SHUTDOWN

VREF

1.25V

0.88V

0.80V

0.72V

ENABLE

COMPARATOR

–

≈0.5V

++

ENABLE

INTERNAL

SUPPLY

1MHz MASTER

OSCILLATOR

ENABLE

D

Q

Q

PHASE SYNC FOR

DC/DC CONTROLLERS

TO

RUN/SS1

RUN/SS2

LT3742 CONTROLLER 1 AND 2

PHASE SYNC

R

S

Q

RUN/SS

TO ENABLE

COMPARATOR

1µA

500kHz SLAVE

OSCILLATOR

PWM

Σ

COMPARATOR

BIAS

GATE

DRIVER

CURRENT

SENSE

AMPLIFIER

ERROR

AMPLIFIER

0.80V

G

SW

SENSE+

SENSE–

FB

SS

VC

0.88V

PG

FB

POWER GOOD

COMPARATORS

0.72V

3742 BD1

LT3742

VIN

VIN

VOUT

3742fa

7

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