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ViewSonic Corporation
Confidential - Do Not Cop VA703b/VA703m
OZ9938GN(IC801): The OZ9938 is high performance, cost-effective CCFL controller
designed for driving large-size LCD applications requiring 2 to 6 CCFLs.PWM
control, Has such functions as short-voltage protection, Over-voltage protection,
over-current protection and etc. The function of each pin and the circuit diagram
inside are as follows:
PIN Descriptions:
Pin Names Description
1 DRV1 Drive output
2 VDDA Supply voltage input
3 TIMER Timing capacitor to set striking time and shutdown delay time
4 DIM
Analog dimming or Internal LPWM dimming or external PWM pulse
input for dimming function
5 ISEN Current sense feedback
6 VSEN Voltage sense feedback
7 OVPT Over-voltage/ over-current protection threshold setting pin
8 NC No connection
9 NC No connection
10 ENA ON/OFF control of IC
11 LCT
Timing capacitor to set internal PWM dimming frequency and also a
pin for analog dimming selection
12 SSECMP Capacitor for soft start time and loop compensation
13 CT Timing resistor and capacitor for operation and striking frequency
14 GNDA Ground for analog signals
15 DRV2 Drive output
16 PGND Ground for power paths