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设计了一种高效率原边反馈隔离式发光二极管(LED)驱动电路。驱动电路由误差放大器电路、脉宽调制电路、过温保护电路、欠压锁定电路以及前沿消隐电路等构成。利用这个驱动电路设计了原边反馈驱动电路系统,采用恒压恒流环路控制使整个系统有高稳定性,采用该驱动电路组成的系统结构简单,只需要通过原边反馈的方式就可以使环路稳定,不需要次级反馈以及环路补偿。设计基于1.5μm双极-CMOS-DMOS(BCD)工艺实现,芯片面积为4.08 mm2。测试结果表明:利用该驱动电路组成的系统在输入电压为85~265 V时,系统的效率都能达到80%以上,达到了预期要求。
A high efficiency primary-side feedback isolated light-emitting diode (LED) driver circuit is designed. Drive circuit by the error amplifier circuit, pulse width modulation circuit, over-temperature protection circuit, under-voltage lockout circuit and leading-edge blanking circuit and other components. The drive circuit is used to design the primary feedback drive circuit system. Constant current and constant current loop control is adopted to make the whole system have high stability. The system composed by this drive circuit has a simple structure and only needs to pass the primary feedback Loop stable without secondary feedback and loop compensation. The design is based on a 1.5μm bipolar-CMOS-DMOS (BCD) process with a chip area of 4.08 mm2. The test results show that the efficiency of the system can reach more than 80% when the input voltage is 85-265 V, which meets the expected requirements.