ADD5207 データシートの表示（PDF） - Analog Devices

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ADD5207

Four-String, White LED Driver for LCD Backlight Applications

Analog Devices 

Data Sheet

ADD5207

FUNCTIONAL BLOCK DIAGRAM

VIN

VDD

1

8

SHDN

10

UVP

REF

VOUT_FB

LINEAR

REGULATOR

VOLTAGE

REFERENCE

UVP

COMP

SHUTDOWN

500kΩ

THERMAL

SHUTDOWN

GND

ADD5207

ERROR

AMP

gm

LL

REF

LL COMP

PWM

COMP

COMP 11

DCOMP

DREF

OSC

+

+

HEADROOM CONTROL

OVP

SW

13

14

VOUT_FB

GND

OVP

REF

R

Q

S

2 FSLCT

CURRENT SENSE

SOFT START

VDD

ISET 3

REF

PWM 9

PWM

DUTY

EXTRACTOR

500kΩ

GND

CURRENT SOURCE DRIVER

FPWM OSCILLATOR

LED OPEN/SHORT

FAULT DETECTOR

CURRENT SOURCE 1

CURRENT SOURCE 2

CURRENT SOURCE 3

CURRENT SOURCE 4

Figure 2. Functional Block Diagram

12 GND

4 FB1

5 FB2

6 FB3

7 FB4

Rev. A | Page 3 of 16

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