`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
