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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.

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

? 280μs restart timer

? Soft start function for the reference voltage of Error Amp

? Package: Pb-free SOP-20