Critical Conduction Mode Interleaved 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 R2A20112A controls a boost converter to provide an active power factor correction.
The R2A20112A adopts critical conduction mode for power factor correction and realizes high efficiency and a low switching noise by zero current switching.
Interleaving function improves ripple current on input or output capacitor by 180 degrees phase shift.
Soft-star, the feedback loop short detection, two mode over-voltage-protection, over-current-protection, Over current
ON/OFF timer protection for boost Diode short and slave ZCD open detection are built in the R2A20112A, 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
      VREF output voltage Vref: 5.0 V ± 1.5%
      UVLO operation start voltage Vuvlh: 10.5 V ± 0.7 V
      UVLO operation shutdown voltage Vuvll: 9.3 V ± 0.5 V
      UVLO hysteresis voltage Hysuvl: 1.2 V ± 0.5 V
    • Functions
      Boost converter control with critical conduction mode
      Interleaving control
      Soft start function for the reference voltage of Error Amp
      Two mode PFC output Over-voltage-protection
      Mode1: Dynamic OVP corresponding to a voltage rise by dynamic load change.
      Mode2: Static OVP corresponding to over-voltage in stable.
      PFC output Dynamic-under-voltage-protection (DUVP)
      Feedback loop open/short detection
      Master and Slave independence over-current-protection
      280 μs restart timer
      Slave ZCD signal open detection
      Over current ON/OFF timer protection for boost Diode short
    • Package
      Pb-free SOP-16


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

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