MAX8722C Ver la hoja de datos (PDF) - Maxim Integrated

Número de pieza

componentes Descripción

Fabricante

MAX8722C

Low-Cost CCFL Backlight Controller

Maxim Integrated 

Low-Cost CCFL Backlight Controller

Pin Description (continued)

PIN

NAME

FUNCTION

18

GH1 High-Side MOSFET NH1 Gate-Driver Output

19

GL1 Low-Side MOSFET NL1 Gate-Driver Output

20

GL2 Low-Side MOSFET NL2 Gate-Driver Output

21

PGND Power Ground. PGND is the return for the GL1 and GL2 gate drivers.

22

VDD

Low-Side Gate-Driver Supply Input. Connect VDD to the output of the internal linear regulator (VCC).

Bypass VDD with a 0.1μF capacitor to PGND.

23

VCC

5.4V/10mA Internal Linear-Regulator Output. VCC is the supply voltage for the device. Bypass VCC with a

1μF ceramic capacitor to GND.

24

GND

Analog Ground. The ground return for VCC, REF, and other analog circuitry. Connect GND to PGND under

the IC at the IC’s backside exposed metal pad.

VIN

GND

VCC

F1

2A

C8

0.1μF

C9

0.47μF

R4

100kΩ

R5

200kΩ

ON/OFF

BRIGHTNESS

SYNC

DPWM

R6

169kΩ

1%

VDD

BATT

GND MAX8722C

VCC

BST2

BST1

GH1

ILIM

LX1

LX2

FREQ

GL1

SHDN

CNTL

SYNC

DPWM

PGND

GL2

GH2

VFB

ISEC

IFB

COMP

TFLT

VCC

C7

0.47μF

C1

4.7μF

25V

C6

0.1μF

C5

0.1μF

NH1 NH2

C2

1μF

T1

NL1 NL2

C11

0.22μF

C10

0.01μF

R3

40.2Ω

1%

CCFL

C3

18pF

3kV

C4

15nF

R1

150Ω

1%

Figure 1. Typical Operating Circuit of the MAX8722C

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