Primary-Side Regulation LED Driver Controller with Active-PFC


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The RT7304A 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 RT7304A 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 RT7304A 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.


Key Spec.
Status Active
Vin (min) (V) 11
Vin (max) (V) 34
Topology Buck-Boost;Flyback
Output C.C.
MOSFET Integrated No
Features Cycle-by-Cycle Current Limit;LED Open Protection;LED Short Protection;OVP;SCP;Thermal Protection;UVP
Package Type SOT-26
  • Tight LED Current Regulation
  • No Opto-Coupler and TL431 Required
  • Power Factor Correction (PFC)
  • Quasi-Resonant
  • Maximum/Minimum Switching Frequency Clamping
  • Maximum/Minimum on-Time Limitation
  • Wide VDD Range (up to 34V)
  • THD Optimization
  • Input-Voltage Feed-Forward Compensation
  • 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 Limitation
TitleLast UpdateShareDownload
Primary-Side Regulation LED Driver Controller with Active-PFC2016/08/04
Technical Documents
TitleLast UpdateShareDownload
Power Solutions for LED Lighting Applications2018/11/22
Minimizing Light Flicker in LED Lighting Applications2018/08/15
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT7304AGESOT-263000 Request Buy from Distributor