Supertex HV816高压可调光场致发光(EL)屏驱动方案
Supertex 公司的HV816是高压可调光场致发光(EL)屏驱动器,可驱动电容达150nF的灯或大约42平方吋的面积.输入电压为2.7V-5.5V,和单个锂离子电池兼容,输出电压为360VPP,输出电压可调整,以便进行调光,输出放电速率可控制,音频噪音低,可用于平板电脑键盘,笔记本电脑键盘,显示器,手提仪表和电子记事簿.本文介绍了HV816主要特性, 方框图和典型应用电路图.
HV816:High Voltage, Dimmable EL(Electro Luminescence) Lamp Driver
(EL) lamp driver designed for driving a lamp capacitance of up to 150nF, or an area of approximately 42 square inches.
It is comprised of a boost converter followed by an H-bridge. The boost converter produces a regulated output voltage, which is set at a nominal value of 180V using an internal reference voltage. The H-bridge is used to produce a differential output drive and the EL lamp will therefore see ±180V (360V peak-to-peak). The HV816 has two internal oscillators, one for controlling the boost converter switching frequency and the other for controlling the H-bridge switching frequency.
Having separate control of each switching frequency allows flexibility in the circuit design.
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