FAN7547A Просмотр технического описания (PDF) - Fairchild Semiconductor

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FAN7547A

LCD Backlight Inverter Drive IC

Fairchild Semiconductor 

Internal Block Diagram

OUT

Vref

VCC

S/S

RCT

VDS

SW

VZ

UVLO

5V

1.3V

0.1V

Oscillator

Vref

3V

Internal

Bias

Output

Driver

QR

S

Comparator1

VZ

2μA

3.7V

Comparator3

VCC

40μA

Comparator2

Buffer Amplifier

VCC1

SDP

OSC

COMP

FB

120μA

7V

Vb

Comparator4

Va

Vref

Comparator5

Vref

OLP

Dimming Control and Mode Selection Block

Analog

PWM

Mixed

2V

Comparator6

50kΩ

Vms

50kΩ

Full Lighting when VDS = 3V

Figure 1. Functional Block Diagram of FAN7547A

1V

GND

FAN7547A Rev. 1.01

© 2005 Fairchild Semiconductor Corporation

FAN7547A Rev. 1.0.3

2

www.fairchildsemi.com

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