TNY290PG is a switch-mode power supply (SMPS) controller IC manufactured by Power Integrations. It belongs to the TinySwitch-4 family, designed for AC-DC flyback power supplies used in adapters, chargers, and standby power circuits. 

The IC integrates several functions in one chip, including a high-voltage MOSFET, oscillator, and protection circuits, which simplifies power-supply design and reduces the number of external components. 

Main Specifications

• Series: TinySwitch-4

• Input voltage: 85 – 265 VAC

• Internal MOSFET breakdown voltage: ≈725 V

• Output power: up to ≈20 W (depending on design)

• Switching frequency: 124 – 140 kHz

• Duty cycle: up to ≈67 %

• Package: DIP-8 (7 pins used)

• Operating temperature: -40 °C to +150 °C