General Description
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 p |
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