PSR SINGLE-STAGE APFC OFFLINE LED DRIVER

DESCRIPTION

The UTC UCL2300 is a high precision primary-side regulation

controller with single stage Active PFC, specially designed for

universal input offline flyback or buck-boost constant current LED

lighting. The controller with on-chip PFC circuit achieves high

power factor and low THD. Operating in critical conduction mode,

the power MOSFET switching loss is reduced and the inductor is

fully utilized.

The UTC UCL2300 adopts proprietary primary side current

sensing scheme. It can precisely control the LED current without

secondary side sense and feedback circuits. The system size and

cost are optimized, as well as the system reliability.

The UTC UCL2300 utilizes patented line and load voltage

compensation method to achieve excellent line and load

regulation. And the line compensation factor can also be tuned

externally for flexibility.

The UTC UCL2300 offers rich protection functions to improve

the system reliability, including LED open circuit protection, LED

short circuit protection, V CC over voltage protection, V CC under

voltage protection, CS resistor open protection and cycle by cycle

current limit. All the protection functions are auto-recovery.

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FEATURES

* Single-stage active PFC for high power factor and low THD

* Primary side control constant current operation, No opto-coupler required

* Ultrafast LED start (<200ms @85V)

* ±3% LED current accuracy

* Excellent line and load regulation

* Critical conduction mode operation

* Source driving method

* Ultra-low (20μA) startup current

* Ultra-low (600μA) Operating current

* High resistance feedback resistor for improved efficiency

* LED open and short circuit protection

* CS resistor open and short circuit protection

* Transformer saturation protection

* Cycle-by-cycle current limit

* V CC over-voltage and under-voltage protection

* Auto fault recovery