意法半导体(ST)公司推出一种新型电子镇流器半驱动器L6569.该自振荡驱动器IC采用双极CMOS-DMOS(BCD)工艺和内部自举结构,与IR2155和IR2151等产品比较,可省去外部的快速恢复自举二极管.可以互相代换.在高驱动(HO)和低驱动(LO)电路中,加有死区时间控制电路,7脚和5脚输出的方波脉冲之间的时间间隔为1.2us,从而可避免外接的两只功率管“共通”.其200W电子变压器电路见图1-1所示为一款音响专用电源.
用两片L6569可以很方便地设计全桥电路如图1-2.
图1-3是采用L6569设计的CFL荧光灯电子镇流器典型应用电路.
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