Primary-Side-Regulation Dimmable LED Driver Controller with Active PFC


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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.


  • AC/DC LED Lighting driver
Key Spec.
Status Active
Supply Voltage (min) (V)
Supply Voltage (max) (V)
Vin (min) (V) 12
Vin (max) (V) 25
Topology Buck-Boost;Flyback
Output C.C.
MOSFET Integrated No
Current Sense Threshold (mV)
Dimming Control PWM
Features OCP;OVP
Package Type SOP-8
  • 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-Time Limitation
  • Wide VDD Voltage Range (up to 25V)
  • Multiple Protection Features
    ► LED Open-Circuit Protection
    ► LED Short-Circuit Protection
    ► Output Diode Short-Circuit Protection
    ► VDD Under-Voltage Lockout
    ► VDD Over-Voltage Protection
    ► Over-Temperature Protection
    ► Cycle-by-Cycle Current Limit
  • RoHS Compliant and Halogen Free
TitleLast UpdateShareDownload
Primary-Side-Regulation Dimmable LED Driver Controller with Active PFC2013/08/23
Technical Documents
TitleLast UpdateShareDownload
Minimizing Light Flicker in LED Lighting Applications2018/08/15
Single-Stage High Power Factor Flyback for LED Lighting2016/06/21
Design Guidelines for RT7302 and RT7304 PSR LED Driver2016/04/08
Additional Documents
Title Last Update ShareDownload
AC/DC Isolated PSR Flyback Controllers for high Power Factor and low THD - RT7302, RT7304 2019/03/04
Evaluation Boards
TitleLast UpdateShareDownload
RT7302 Flyback T8 18W2018/11/01
Design Tool
TitleLast UpdateShare
RT7302 Flyback Design Tool 2019/04/16
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT7302GSSOP-82500 Not available Buy from Distributor