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
  • Package
    • Pb-free SOP-16
  • 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




Design & Development