R03DS0002EJ0100 Rev.1.00

Page 1 of 9

Jul 14, 2010

R2A20118ASP

Critical Conduction Mode Interleaved PFC Control IC

Description

The R2A20118A controls a boost converter to provide an active power factor correction.

The R2A20118A is based on R2A20117, and additional functions are OVP2 and Brownout.

The R2A20118A 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.

The feedback loop short detection, two modes overvoltage protection and OVP2, overcurrent protection, overcurrent

timer latch protection, and ZCD open detection are built in the R2A20118A, and can constitute a power supply system

of high reliability with few external parts.

Features

 Absolute Maximum Ratings

 Supply voltage Vcc: 24 V

 Operating junction temperature Tjopr: –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

 Brownout function

 Two mode overvoltage protection and OVP2

Mode1: Dynamic OVP corresponding to a voltage rise by dynamic load change

Mode2: Static OVP corresponding to overvoltage in stable.

OVP2: OVP2 sense the PFC output voltage by independenced pin.

 Feedback loop short detection

 Slave ZCD signal open detection

 RAMP charge current selectable function

 Master and Slave independenced overcurrent protection

 Overcurrent timer latch protection at abnormal operation

 280 s restart timer

 Soft start function for the reference voltage of Error Amp

 Package: Pb-free SOP-20

Ordering Information

Part No.

Package Name

Package Code

Package

Abbreviation

Taping Abbreviation (Quantity)

R2A20118ASPW0

FP-20DAV

PRSP0020DD-B

SP

W (2,000 pcs/reel)

R03DS0002EJ0100

Rev.1.00

Jul 14, 2010