TOP243YN
TOP243YN is an offline switch-mode power supply (SMPS) IC manufactured by Power Integrations. It belongs to the TOPSwitch-II family, designed for AC‑DC converters. This IC integrates a high-voltage MOSFET, PWM controller, startup circuitry, and protection functions in a single chip. (alldatasheet.com)
Main Specifications
Type: Offline PWM switch (SMPS controller)
Series: TOPSwitch-II
Package: TO‑220‑3
Input voltage: 85–265 V AC
Breakdown voltage: 700 V
Switching frequency: ~100 kHz
Maximum output power: ~110 W (single input voltage), ~70 W (wide input)
Operating temperature: −40 °C to +150 °C