LT3758EDD 데이터 시트보기 (PDF) - Linear Technology

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LT3758EDD

High Input Voltage, Boost, Flyback, SEPIC and Inverting Controller

Linear Technology 

LT3758/LT3758A

Block Diagram

2.5V

IS3

VC

1

CC2

RC

CC1

1.72V – A11

+

G6

– A12

–0.88V +

FBX

FBX

2

1.6V +

A1

–

+

A2

–0.8V –

VIN

R4 R3

+

CIN

A10

IS1

2µA

2.5V

IS2

10µA

Q3

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

Q2

1.28V –

+A3

TSD

165˚C

VC –

+A7

5V UP

4.5V DOWN

DRIVER

SR1

GATE

G5

RO

G2

7

S

PWM

COMPARATOR

SLOPE

VISENSE

RAMP

RAMP

GENERATOR

G1

100kHz-1MHz

OSCILLATOR

110mV

A6

SENSE

6

A5

GND

11

M1

RSENSE

VOUT

+ R2 COUT1 COUT2

R1

FREQUENCY

FOLDBACK

R5

8k

D2

D3

1.2V +

+ A4

Q1

–

FREQ

PROG

SS

3

CSS

SYNC

5

RT

4

RT

3758 F01

Figure 1. LT3758 Block Diagram Working as a SEPIC Converter

3758afd

9

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