RAA223181 Overview
900V Off-Line Flyback Regulator Datasheet The RAA223181 is an off-line Flyback regulator with a 900V integrated MOSFET, designed for high input voltage and high reliability application of smart meter power supplies and other general isolated power supplies. The RAA223181 operates in DCM with constant switching frequency at full load. The system is inherently stable with an easy feedback loop design, while switching at constant frequency without interfering the munication of the smart meter. At light load, RAA223181 enters burst mode operation to reduce the IC power consumption, while keeping the burst frequency less than 3kHz to avoid interference to the PLC frequency band. RAA223181 features a unique short-time heavy load operation mode, which delivers up to 12W output power for a programmed time period. This allows the smart meter power supply to be designed at regular power level...
RAA223181 Key Features
- Flyback regulator with 900V 10Ω MOSFET
- Single 400V input capacitor for input up to 450VAC
- Frequency doubling for heavy load operation (up to
- Valley switching to reduce switching losses
- Programmable constant frequency DCM operation
- Burst mode operation at light load
- Protection features: Short-Circuit Protection (SCP)