RT7302

® RT7302 Primary-Side-Regulation Dimmable LED Driver Controller with Active PFC General Description The RT7302 is a constant current LED driver with active power factor correction. It supports high power factor across a wide range of line voltages, and it drives the converter in the Quasi-Resonant (QR) mode to achieve higher efficiency. By using Primary Side Regulation (PSR), the RT7302 controls the output current accurately without a shunt regulator and an opto-coupler at the secondary side, reducing the external component count, the cost, and the volume of the driver board. The RT7302 is designed to be compatible with PWM Dimming. The output current can be modulated by the duty ratio of the external PWM dimming signal. An in-house design High Voltage (HV) start-up device is integrated in the RT7302 to minimize the power loss and shorten the start-up time. The RT7302 embeds comprehensive protection functions for robust designs, including LED open-circuit protection, LED short-circuit protection, output diode short-circuit protection, VDD Under-Voltage Lockout (UVLO), VDD Over-Voltage Protection (VDD OVP), Over-Temperature Protection (OTP), and cycle-by-cycle current limitation. Features  Tight LED Current Regulation  No Opto-Coupler and TL431 Required  Power Factor Correction (PFC)  Compatible with PWM Dimming  Built-in HV Start-up Device  Quasi-Resonant  Maximum/Minimum Switching Frequency Clamping  Input Voltage Feed-Forward Compensation  Maximum/Minimum On-Tim...