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



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