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