The R2A20111 is a power-factor correction (PFC) controller IC. This IC adopts continuous conduction mode as PFC operation. Various functions such as constant power limit, overvoltage detection, overcurrent detection, soft start, feedback-loop disconnection detection, and holding function of PFC operation through momentary outage (PFC hold function) are incorporated in a single chip. These functions reduce external circuitry. The constant power limit function allows to eliminate a significant amount of coil noise which is generated due to overcurrent detection operation in case of conventional overload. The PFC hold function enables quick recovery by continuing PFC operation after momentary outage. The hold time can be adjusted by an external capacitance. Overcurrent detection pin is separately provided. Latch mode shutdown function is incorporated. A soft-start control pin provides for the easy adjustment of soft-start operation, and can be used to prevent overshooting of the output voltage.


  • Maximum ratings Power-supply voltage Vcc: 24 V Junction temperature Tj: – 40 to 125°C
  • Electrical characteristics VREF output voltage VREF: 5.0 V ± 3% UVLO operation start voltage VH: 10.5 ± 0.9 V UVLO operation stop voltage VL: 9.0 ± 0.7 V PFC output maximum ON duty Dmax-out: 95% (typ.)
  • Functions Constant power limit function Continuous conduction mode Hold function of PFC operation on momentary outage (PFC hold function) Overvoltage detection Overcurrent detection Soft start Feedback loop disconnection detection IC shutdown function Package lineup: SOP-16

Product Options

Part Number Part Status Pkg. Type Carrier Type Buy Sample
Active SOP

Documentation & Downloads

Title Other Languages Type Format File Size Date
Datasheets & Errata
R2A20111SP Data Sheet 日本語 Datasheet PDF 260 KB
Technical Updates
Regarding the revision of application note of R2A20114BFP 日本語 Technical Update PDF 407 KB
Application Notes & White Papers
Industrial Ethernet PHY (R19AN0014ED0102) Application Note PDF 1.21 MB
Industrial Ethernet PHY (R19AN0015ED0102) Application Note PDF 1.30 MB
R2A20112A Application Note Application Note PDF 224 KB
R2A20134SP Application Note 日本語 Application Note PDF 1.11 MB
AN1681: Grounding Techniques Application Note PDF 509 KB
AN1684: Nonideality of Ground Application Note PDF 397 KB
Unification of a JEDEC tray and a embossed carrier tape for LQFP package (Additional Information & Correction) 日本語 Product Change Notice PDF 4.86 MB
Unification of a JEDEC tray and a embossed carrier tape for LQFP package ( PC-WRP-A001B/E ) 日本語 Product Change Notice PDF 3.74 MB
Unification of a JEDEC tray and a embossed carrier tape for LQFP package ( PC-WRP-A001A/E ) 日本語 Product Change Notice PDF 1.46 MB