UNISONIC TECHNOLOGIES CO., LTD

UCL5811

Preliminary

CMOS IC

www.unisonic.com.tw

1 of 5

Copyright © 2016 Unisonic Technologies Co., Ltd

QW-R125-060.a

PSR & PFC LED DRIVER

CONTROLLER

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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.

short circuit protection, cycle-by-cycle current limit and secondary

over-temperature protection.The driver output voltage is clamped at

18V to protect the external power MOSFET.

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FEATURES

SOP-8

* 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

* 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

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ORDERING INFORMATION

Ordering Number

Package

Packing

UCL5811G-S08-R

SOP-8

Tape Reel