Dell 2000FP Manuale di servizio - Pagina 29

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Dell 2000FP LCD Monitor Service Guide

DDC IC for both D-SUB and DVI

24C02 is used to support DDC2B function in both D-SUB and DVI ports. EDID data used for D-SUB and DVI

are stored in different 24C02's respectively.

EEPROM

A 24C16 (2048 bytes) is used to store user settings, such as user timing settings, brightness/contrast, color

temperature, etc.

DC-DC converter

Buck Converter

R731

Fig.1 shows a typical Buck converter circuit. Q705 is a switching device. Q703, Q704 are a totem pole which

gets enough ability to drive P-MOS. When pin4 of Q705 is low, Q750 turns on. At high level, Q750 turns off.

So, pulse waveform will appear at D-terminal of Q705. L701,C711,C712,C713 and D701,D703 will transfer the

pulse to stable DC level.

PWM IC (TL1451)

Q703

2N3904

R737

R714

20K

3.3K

R715

Q704

2N3906

R733

2.7K

GND

R732

Q705

SI4431DY

D701

RB060L-40

Fig.1

Confidential

Circuit Operation Theory

L701

68U

L703

OPEN

C713

C712

C711

100U

16V

D703

R719

1.1K

(1%)