Rainbow-electronics MAX8709 Bedienungsanleitung PDF herunterladen (Seite 9)

MAX8709

High-Efficiency CCFL Backlight

Controller with SMBus Interface

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Pin Description (continued)

NAME

FUNCTION

26 CCV

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

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

MAX8709 Supply Input. Input to the internal 5.3V linear regulator (V

) that provides power to the device.

Bypass BATT to GND with a 0.1µF capacitor.

28 V

5.3V Linear-Regulator Output. V

is the supply voltage for the MAX8709. Bypass V

to GND with a

0.47µF ceramic capacitor. V

can also be connected to BATT if V

BATT

< 5.5V.

7V TO 24V

0.1µF

100kΩ

0.1µF

100kΩ

C10

0.01µF

C11

0.1µF

SMBSUS

SMBDATA

SMBCLK

SCL

SDA

SUS

CCI

CCV

BATT

GND

LOT

REF

ILIM

BST2

BST1

GH1

LX1

LX2

GL1

PGND

GL2

GH2

VFB

ISEC

IFB

MAX8709

0.47µF

0.1µF

4.7µF

25V

NH1

NL1

NH2

NL2

1µF

1:93

CCFL

15pF

3kV

40.2Ω

22nF

2kΩ

150Ω

Figure 1. Typical Operating Circuit of the MAX8709

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 22 23

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