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



PDF 265 KB 日本語 Datasheet
PDF 5.51 MB 日本語 Brochure
PDF 4.86 MB 日本語 Product Change Notice
PDF 407 KB 日本語 Technical Update
PDF 3.74 MB 日本語 Product Change Notice
PDF 1.46 MB 日本語 Product Change Notice
PDF 1.21 MB Application Note
PDF 1.30 MB Application Note
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PDF 1.11 MB 日本語 Application Note
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