Alpha & Omega Semiconductor AOZ1978

Description

The AOZ1978 is a dual-channel high-efficiency LED driver controller for high voltage LED backlighting applications. It is designed to independently drivetwo high-brightness LED light bars in LED TV applications. The AOZ1978 can support a wide range of input and output voltages. The input bias voltage range of AOZ1978 is from 8V to 18V.The AOZ1978 has multiple features to protect the regulator under fault conditions. A control pin can disable an external switch to disconnect the LEDs current path from the output in PWM dimming or under catastrophic failure conditions. Cycle-by-cycle current protection limits the peak inductor current.Thermal shutdown provides another level of protection. An output flag to indicate the fault condition if output of any channel is shorted to ground.Low feedback voltage (500mV) helps to reduce power loss.The AOZ1978 is available in a standard SO-20 package and operates over the temperature range of -40C to +85C.

Features

• 8V to 18V input bias voltage
• 180⁰ Out of phase channel switching provides
• input ripple current cancellation
• 18V driving capability at GATE pins
• Disconnect control pin for PWM dimming or fault conditions
• Flag to indicate output short or fault condition
• 500mV feedback regulation
• External reference input and Analog Dimming capability
• 8 bit PWM dimming resolution
• Cycle-by-cycle current limit
• Output over-voltage protection
• LED short and open protection
• Thermal shutdown protection
• SO-20 package

Typical applications

• LCD TV LED Backlight

More information

• Datasheet
• IC product information