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


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The RT7306 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 RT7306 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 RT7306 is compatible with analog dimming. The output current can be modulated by the DIM pin. An in-house design high voltage (HV) start-up device is integrated in the RT7306 to minimize the power loss and shorten the start-up time.

The RT7306 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) 11
Vin (max) (V) 34
Topology Buck-Boost;Flyback
Output C.C.
MOSFET Integrated No
Current Sense Threshold (mV)
Dimming Control Analog
Features Cycle-by-Cycle Current Limit;LED Open Protection;LED Short Protection;OVP;Thermal Protection
Package Type SOP-8
  • Tight LED Current Regulation
  • No Opto-Coupler and TL431 Required
  • Power Factor Correction (PFC)
  • Compatible with Analog Dimming
  • Built-in HV Start-up Device
  • 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 Dimmable LED Driver Controller with Active-PFC2015/07/22
Technical Documents
TitleLast UpdateShareDownload
Minimizing Light Flicker in LED Lighting Applications2018/08/15
Evaluation Boards
TitleLast UpdateShareDownload
RT7306 Evaluation Board2017/07/26
Low cost smart lighting EVB with RF module2017/07/26
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT7306GSSOP-82500 Not available Buy from Distributor