你喜欢大海我爱过你 LZC8660 高PF低谐波原边恒流100W调光方案

General Description
LZC8720 is a voltage mode Buck PFC controller
operating at transition mode. It keeps the Buck
converter in constant on time operation to
achieve high power factor.
This device provides protections of internal soft
start, over voltage protection, over current
protection and thermal shutdown. It can
minimize the external components counts, and
makes the design easy.

General Description
LZC8710 is a voltage mode Buck PFC controller
operating at transition mode. It keeps the Buck
converter in constant on time operation to
achieve high power factor. The controller
supports flexible current compensation setting in the
appointed temperature with a NTC resistor.
This device provides protections of internal soft
start, over voltage protection, over current
protection and thermal shutdown. It can
minimize the external components counts, and
makes the design easy.
The LZC811C 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 LZC811C 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 ** glitch and results in
reduced external components and system
cost.  The  multi-protection  features  of
LZC811C greatly enhance the system
reliability and safety. The LZC811C 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.