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LT3954IUHE

40VIN LED Converter with Internal PWM Generator

Linear Technology 

LT3954

BLOCK DIAGRAM

VREF

–

+A7

2V

180µA

PWM

F1(IDIM/SS)

F2(IDIM/SS)

–

FB

+

1.3V

OVFB

COMPARATOR

PWMOUT

1.25V

– LDO

+A8

0.8V + F3(IDIM/SS) –

+

–

0.8V +

S

RQ

PWMINT

VIN

7.85V

INTVCC

SW

100mV

CTRL

CTRL

BUFFER

1V

CLAMP

×1/4

A3

ISP

ISN

FAULT

1.5mA

10µA

CC EAMP

– A1

+gm

10µA AT

A1+ = A1–

CV EAMP

1.25V + A5

FB

–gm

10µA AT

FB = 1.25V

VC

EN/UVLO – A6

1.22V +

2.2µA

SHDN

FAULT

BANDGAP ISP > ISN + 0.6V

REFERENCE

T > 165°C

FAULT

LOGIC

+

–A2

RQ

M1

S

DRIVER

48mV

CURRENT MODE

COMPARATOR

RAMP

GENERATOR

A4

ISENSE

RSENSE

PGND

GNDK

GND

IDIM/SS

DETECT

100kHz TO 1MHz

OSCILLATOR

1V +

+– FREQ

PROG

12µA

DIM/SS

PWMINT

25mV

ISN

+

ISP –

RT SYNC

–

1.2V

FB +

VMODE

OPENLED

LOGIC

3954 BD

3954fa

10

For more information www.linear.com/3954

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