LT3761H 데이터 시트보기 (PDF) - Linear Technology

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LT3761H

60 VIN LED Controller with Internal PWM Generator

Linear Technology 

LT3761

Block Diagram

ILED

RLED

VREF

–

+A7

2.02V

PWM

F1(IDIM/SS)

F2(IDIM/SS)

185µA

0.8V + F3(IDIM/SS) –

+

–

0.8V +

–

FB

+

1.3V

OVFB

COMPARATOR

PWMOUT

1.25V

– LDO

+A8

S

RQ

PWMINT

VIN

7.85V INTVCC

CTRL

ISP

ISN

FB

VC

100mV

CTRL

BUFFER

1V

CLAMP

×1/4

A3

1.5mA

FAULT

– A1

+gm

CC EAMP

1.25V

+ A5

–gm

CV EAMP

10µA

10µA AT

A1+ = A1–

10µA AT

FB = 1.25V

EN/UVLO – A6

1.22V +

2.3µA

SHDN

FAULT

BANDGAP ISP > ISN + 0.6V

REFERENCE

T > 165°C

FAULT

LOGIC

+

PWM LATCH

GATE

–A2

RQ

S

DRIVER

105mV

CURRENT MODE

COMPARATOR

RAMP

GENERATOR

A4

ISENSE

SENSE

GND

IDIM_SS

DETECT

100kHz TO 1MHz

OSCILLATOR

1V +

+– FREQ

PROG

12µA

DIM/SS

PWMINT

25mV

ISN

+

ISP –

–

1.2V

FB +

RT

OPENLED

OPENLED

LOGIC

3761 BD

ISWITCH

RSNS

3761f

10

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