Description

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.

Features

? 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