OZ965

The OZ965 is a single chip, high-efficiency, Cold Cathode Fluorescent Lamp (CCFL) backlight  inverter controller whose primary function is to  convert +5 volt DC power to approximately 600  VAC. Additionally, the OZ965 performs the lamp  dimming function with an analog voltage or low  frequency Pulse Width Modulation (PWM) control.  
 
Operating Principle:  The CCFL tube, transformer secondary, and  capacitor form a resonant circuit. The OZ965 utilizes the low energy loss resonate mode  principle to deliver a very high efficiency inverter.  
 
The OZ965 drives the transformer primary with a  variable pulse width voltage directly from the +5v supply. The resultant primary drive current is  alternately reversing with zero-voltage-switching.

Because of the transformer leakage inductance and the secondary resonant circuit, the  secondary voltage and current are approximately sinusoidal. This sinusoid results in very little harmonic emi/rfi emissions.
 
The OZ965 operates at a single, constant  frequency in a PWM mode. Typical operating  frequency ranges between 30 KHz to 200 KHz, dependent upon the CCFL and transformer  characteristics. Intelligent open-lamp protection  provides design flexibility so various transformer models/manufacturers may be used.
 
Its high driving capability allows the OZ965 to drive high power MOSFETs.
 
The single stage design results in a low cost, reliable transformer without expensive, less  reliable secondary fold-back treatment. The  transformer does not require a more expensive center tapped primary. 
 
The OZ965 is available in 16-pin SOP and TSSOP packages. It is specified over the  commercial temperature range of 0 to +70,  and the industrial temperature range of -40to  +85.