LZC8120 PSR & PFC LED Driver Controller Confidential Page 1 Preliminary Ver:0.24 General Description The LZC8120 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. It can significantly simplify the LED lighting system design by eliminating the secondary side feedback components and the opto-coupler. The LZC8120 integrates active power factor correction and works in Quasi Resonance mode (QRM) in order to reduce the MOSFET switching losses. With a building in 700V start-up MOSFET, IC can eliminate the power loss caused by start-up resistors to provide a high efficiency solution for lighting applications. 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 LZC8120 greatly enhance the system reliability and safety. The LZC8120 features VDD and output over voltage protection; output short circuit protection, cycle-by-cycle current limit and secondary peak current protection on CS pin, VDD UVLO and auto-restart and over-temperature protection. The driver output voltage is clamped at 18V 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 · Very less components · Programmable input AC voltage compensation · Leading Edge Blanking on CS/FB pin · Protection Features Ø Building in hysteresis OTP Ø VDD over voltage protection Ø Cycle by cycle current limiting on CS
