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The AOZ1978 is a dual-channel high-efficiency LED
driver controller for high voltage LED backlighting
applications. It is designed to independently drive
two 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
-40C to +85C
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制造商零件编号：AOZ1978AI
制造商：Alpha & Omega Semiconductor Inc
描述：IC LED DRVR BCKLGT 16SOIC
系列：EZBoost?
恒流：-
恒压：-
拓扑：PWM，升压（升压）
输出数：1
内部驱动器：无
类型 - 初级：背光
类型 - 次级：高亮度 LED（HBLED）
频率：50kHz ~ 300kHz
电压 - 电源：8 V ~ 30 V
电压 - 输出：16V
安装类型：表面贴装
封装/外壳：16-SOIC（0.154"，3.90mm 宽）
供应商器件封装：20-SOIC
工作温度：-40°C ~ 85°C 8V to 18V input bias voltage
180⁰Out 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
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
Applications
LCD TV LED backlight
