Critical Conduction Mode PFC Control IC

Equipped with a variety of functions for improving efficiency, driving higher efficiency and eco-friendliness for power supply systems of electric devices, and thus society as a whole. Driver ICs are also available for high-accuracy, high-efficiency LED lighting systems.

Product Status: Mass Production


The R2A20133D controls a boost converter to provide an active power factor correction.
The R2A20133D adopts critical conduction mode for power factor correction and realizes high efficiency and a low switching noise by zero current switching.
Because the zero current is detected by using the GND current, the ZCD Auxiliary winding is unnecessary.
The feedback loop open detection, two mode overvoltage protection, overcurrent protection are built in the R2A20133D, and can constitute a power supply system of high reliability with few external parts.


    • Absolute Maximum Ratings
      Supply voltage Vcc: 24 V
      Junction temperature Tj: –40 to +150°C
    • Electrical characteristics
      UVLO operation start voltage VH: 9.5 V ± 0.7 V
      UVLO operation shutdown voltage VL: 8.5 V ± 0.4 V
      UVLO hysteresis voltage Hysuvl: 1.0 V ± 0.4 V
    • Functions
      Boost converter control with critical conduction mode
      Two mode overvoltage protection and OVP2
      Mode 1: Dynamic OVP corresponding to a voltage rise by load change
      Mode 2: Static OVP corresponding to overvoltage in stable.
      OVP2: OVP2 senses the PFC output voltage by independence pin.
      Feedback loop, open detection
      Overcurrent protection
      Dynamic UVP corresponding to a voltage fall by load change
      Frequency limiter, adjustable
      Zero Current Detect (ZCD) delay time, adjustable
      CS pin's open detection
      Package lineup: Pb-free SOP-8 (JEDEC)


Basic Information
Part Name
Production Status
Mass Production
Vin (V) max.
Vo (V) max.
Pin Count
Package Type

Pin Assignment


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