Rainbow-electronics MAX8758 Manual do Utilizador descarregar pdf (Página 10)

MAX8758

Typical Operating Circuit

The typical operating circuit (Figure 1) of the MAX8758

is a power-supply solution for TFT LCD panels in note-

book computers. The circuit generates a +8.5V source

driver supply, and approximately +22V and -7V gate

driver supplies. The input voltage range for the IC is

from +1.8V to +5.5V, but the Figure 1 circuit is

designed to run from 2.7V to 3.6V. Table 1 lists some

selected components and Table 2 lists the contact

information of component suppliers.

Step-Up Regulator with Switch Control and

Operational Amplifier for TFT LCD

10 ______________________________________________________________________________________

MAX8758

MAIN

+8.5V/300mA

TO VCOM

BACKPLANE

GON

+24V/20mA

FROM TCON

+1.8V TO +5.5V

GOFF

-8V/20mA

FREQ

SHDN

COMP

LDO

GND

PGND

OUT

SUPB

GON

DRN

CTL

MODE

POSB

NEGB

OUTB

THR

DLP

SRC

C15

0.1µF

3.3µF

6.3V

3.3µF

6.3V

10Ω

1µF

R10

100kΩ

220pF

33pF

0.22µF

C10

0.022µF

C11

150pF

20kΩ

D2 D3

4.7µF

10V

4.7µF

10V

4.7µF

10V

4.7µH

0.1µF

C17

0.1µF

C19

0.1µF

C18

0.1µF

200kΩ

34.0kΩ

C12

0.1µF

100kΩ

20.0kΩ

51.1kΩ

C13

0.033µF

C14

0.1µF

Figure 1. Typical Operating Circuit

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 19 20

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