Features: · Single-stage power conversion, requiring only a +5 V voltage source · Reduces the number of components and board size by 30% compared with conventional design · Supports both floating and grounded secondary designs · 90% efficiency vs. typical 75% efficiency of conventional designs · I...
OZ965: Features: · Single-stage power conversion, requiring only a +5 V voltage source · Reduces the number of components and board size by 30% compared with conventional design · Supports both floating an...
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VDD | 5.5V | |
GND | +/- 0.3V | |
Logic inputs | -0.3 V to VDD+0.3V | |
OZ965 | OZ965I | |
Operating temp. | 0 to 70 | -40 to 85 |
Operating junction temp. | 150 | |
Storage temp. | -55 to 150 | |
OZ965 | OZ965I | |
Power dissipation - 16-pin SOP - 16-pin TSSOP |
.720W .690W |
.580W .550W |
Thermal Impedance - 16-pin SOP - 16-pin TSSOP |
111 /W 115 /W |
111 /W 115 /W |
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 of OZ965 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 of OZ965 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.