MAX8709B Просмотр технического описания (PDF) - Maxim Integrated

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MAX8709B

High-Efficiency CCFL Backlight Controller with SMBus Interface

Maxim Integrated 

High-Efficiency CCFL Backlight

Controller with SMBus Interface

Pin Description (continued)

PIN

NAME

FUNCTION

Voltage-Loop Compensation Pin. CCV is the output of the voltage-loop transconductance amplifier (GMV)

that regulates the maximum average secondary transformer voltage. The CCV voltage controls the time

26

CCV interval during which the full bridge applies the input voltage (BATT) to the transformer primary. The CCV

capacitor also sets the rise time and fall time of the lamp current in DPWM. Connect CCV to GND with a

6.8nF capacitor. CCV is internally discharged to GND in shutdown.

27

BATT MAX8709B Supply Input. Input to the internal 5.3V linear regulator (VCC) that provides power to the

device. Bypass BATT to GND with a 0.1µF capacitor.

28

VCC

5.3V Linear-Regulator Output. VCC is the supply voltage for the MAX8709B. Bypass VCC to GND with a

0.47µF ceramic capacitor. VCC can also be connected to BATT if VBATT < 5.5V.

VIN

7V TO 24V

C8

0.1μF

C9

0.1μF

R4

100kΩ

R5

100kΩ

C10

0.01μF

SMBSUS

C11

0.1μF

SMBDATA

SMBCLK

BATT

VCC

GND

VDD

LOT

BST2

BST1

REF

MAX8709B GH1

ILIM

LX1

LX2

GL1

CCV

PGND

CCI

GL2

GH2

SUS

VFB

SDA

ISEC

SCL

IFB

C7

0.47μF

D1

C6

0.1μF

C5

0.1μF

NH1 NH2

NL1 NL2

C1

4.7μF

25V

C2

1μF

T1

1:93

CCFL

C3

15pF

3kV

C4

R2

R3

22nF

2kΩ

40.2Ω

1%

R1

150Ω

1%

Figure 1. Typical Operating Circuit of the MAX8709B

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