PSR & PFC LED DRIVER CONTROLLER
DESCRIPTION
The UTC UCL5811 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
feedback components and the opto-coupler.
The UTC UCL5811 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 UTC UCL5811 greatly enhance the
system reliability and safety.
The UTC UCL5811 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 andauto-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 compensation
* Leading Edge Blanking on CS/FB pin
* Building in hysteresis OTP
* VDD over voltage protection
* Cycle by cycle current limiting on CS pin
* Secondary peak current protection on CS pin
* Output short to GND protection
* Output programmable over voltage protection
* FB and CS pins default protection |
