过压保护LZC8650 LZC8620菱奇300W投光灯方案隔离高PF成本低

2018-8-29 20:41:16 2814 过压保护电路 pnp 过压保护

0 `The LZC8620 is a single-power stage, isolated and primary side offline LED lighting regulator which achieves high power factor. The proprietary real-current control method can control the LED current accurately from the primary side information. Support flexible current compensation setting in the appointed temperature with a NTC resistor. It can significantly simplify the LED lighting system design by eliminating the secondary side feedback components and the opto-coupler. The LZC8620 integrates active power factor correction and works in Quasi Resonance mode (QRM) in order to reduce the MOSFET switching losses. The external programmable line voltage compensation provides a more precise output current throughout the universal AC input voltage range. The leading-edge blanking circuit on the CS/FB input removes the signal glitch and results in reduced external components and system cost. The multi-protection features of LZC8620 greatly enhance the system reliability and safety. The LZC8620 features VDD and output over voltage protection; output short circuit protection, cycle-by-cycle current limit on CS pin, VDD UVLO and auto-restart and over-temperature protection. The driver output voltage is clamped at 16V to protect the external power MOSFET. Features  Single stage PFC  Primary side regulation without Secondary Feedback  Quasi Resonance (QR) mode with Fly-back topology  Real-Current control to meet accurate output current  Flexible current compensation setting in the appointed temperature  Very less components  Programmable input AC voltage compensation  Leading Edge Blanking on CS/FB pin  Protection Features  Building in hysteresis OTP  VDD over voltage protection  Cycle by cycle current limiting on CS pin  Output short to GND protection  Output programmable over voltage protection  FB and CS pins default Applications Offline AC/DC Flyback power converters for LED lighting Typical Application ` 0 本帖子中包含更多资源您需要登录才可以下载或查看，没有帐号？注册 x
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