PSR SINGLE-STAGE APFC OFFLINE LED CONTROLLER
DESCRIPTION
The UTC UCL2310 is a high precision primary-side regulation
PWM 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 UCL2310 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 UCL2310 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 UCL2310 offers rich protection functions to improve
the system reliability, including LED open circuit protection, LED
short circuit protection, VCC over voltage protection, VCC under
voltage protection, CS resistor open protection and cycle by cycle
current limit. All the protection functions are auto-recovery. The
system reliability is further improved by the thermal regulation
function. The output current is reduced when the controller is
over temperature.
FEATURES
* Single-Stage Active PFC for High Power Factor and Low THD
* Primary Side Control Constant Current Operation, No Opto-Coupler required
* ±3% LED Current Accuracy
* Excellent Line and Load Regulation
* Critical Conduction Mode Operation
* Ultra-Low (33uA) Startup Current
* High Resistance Feedback Resistor for Improved Efficiency
* LED Open and Short Circuit Protection
* CS Resistor Open Circuit Protection
* Cycle-by-Cycle Current Limit
* VCC Over-voltage and Under-voltage Protection
* Auto Fault Recovery
* Thermal Regulation Function |
