7-9
10. Inverter
10.1 Circuit Diagram
10.2 Inverter basic function
This is a Dc-AC Inverter which is developed for driving 2 Cold Cathode Fluorescent Lamp (CCFL) in LCD
panel backlight system.
Circuit explain below:
(1) On/Off circuit
This is an input signal to turn on or off the AC output voltage of the Inverter.
ON states : On/Off pin>=2.5V
OFF state : On/Off pin<=2.0V
(2) IC (LM393)
It will get input signal from customer system and control the lamps current and brightness. The other
function include burst mode control, PWM control, and soft start.
Buck
circuit
Input Power
ON/OFF
circuit
IC
Royer
circuit
Protection
circuit
Feedback
circuit
HV
circuit
Balance
circuit
Lanp:1 Lanp:2
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