LT3795 查看數據表（PDF） - Linear Dimensions Semiconductor

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LT3795

110V LED Controller with Spread Spectrum Frequency Modulation

Linear Dimensions Semiconductor 

Block Diagram

LT3795

EN/UVLO

– A1

1.22V +

3µA

FB

VC

SHDN

1.25V

– A2

gm

+

10µA AT

FB = 1.25V

ISMON

ISP

ISN

CTRL1

CTRL2

1.5V –

SHORT-CIRCUIT

DETECT

A4

SCILM

×1

+

+ A5

×4

–

100mV

– + VLED –

1.1V +

+

+

gm

EAMP 10µA AT

A6+ = A6–

A6

2.5V

10µA

IVINP R1

10µA AT

1.2V

+

A8 IVINCOMP

= 1.2V

gm

–

IVINN R2 = R1

IVINCOMP

–

A11

+

5.5V

R3 = R1 × 20

PWM

THERMAL

SHDN

SS

2.5V

28µA

SHORTLED

TGOFFB

FAULTB

SS AND

LOGIC

SCILM

A16

EN

1mA

VINOV OVFB

FB

INTVCC SCILM

0.3V

FB +

A21

2.8µA

OVLO

A17

+

1.25V –

1.3V –

OVFB

COMPARATOR

INTVCC

100µA

A18

2.015V

VREF

SS

TG

PWM

ISP

ISP-7V

1.25V

–

LDO

A3

+

VIN

7.7V

INTVCC

TGOFFB

+

FAULTB

A7

–

PWM

COMPARATOR

RQ

S

DRIVER

ILIM

A9

GATE

113mV

RAMP

GENERATOR

100kHz TO 1MHz

OSCILLATOR

ISENSE

A10

SENSE

GND

OPENLED

1.20V –

A14

A7

FB +

VLED

200mV

–

A15

A7

+

C/10 COMPARATOR

WITH 200mV

HYSTERESIS

INTVCC

12µA

12µA

2V –

AA719

+

–

AA720

1V

+

PWM

RT RAMP

S

R

Q

3796 BD

For more information www.linear.com/LT3795

3795f

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