LT3757(RevB) Просмотр технического описания (PDF) - Linear Technology

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Компоненты Описание

производитель

LT3757
(Rev.:RevB)

Boost, Flyback, SEPIC and Inverting Controller

Linear Technology 

LT3757

Block Diagram

2.5V

IS3

VC

1

CC2 RC

CC1

1.72V – A11

+

G6

– A12

–0.88V +

FBX

FBX

2

1.6V +

A1

–

+

–0.8V –A2

VIN

R4 R3

+

CIN

IS1

2µA

2.5V

IS2

10µA

Q3

A10

INTERNAL

REGULATOR

AND UVLO

UVLO

G4

G3

9

SHDN/UVLO

1.22V

CURRENT

17.5V LIMIT

A9

7.2V LDO

A8

L1

10

VIN

CDC D1

L2

• FBX

INTVCC CVCC

8

TSD

165˚C

VC –

+A7

2.7V UP

2.6V DOWN

DRIVER

SR1

GATE

G5

RO

G2

7

S

Q2 PWM

COMPARATOR

1.25V –

+A3

SLOPE

VISENSE

RAMP

RAMP

GENERATOR

G1

100kHz-1MHz

OSCILLATOR

108mV

A6

SENSE

6

A5

GND

11

M1

RSENSE

VOUT

R2 + COUT2

COUT1

R1

FREQUENCY

FOLDBACK

FREQ

FOLDBACK

1.25V

+

+

A4

Q1

–

FREQ

PROG

SS

3

CSS

SYNC

5

RT

4

RT

3757 F01

Figure 1. LT3757 Block Diagram Working as a SEPIC Converter

3757fb



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