STMicroelectronics, AC-DC Converter 10-Pin, PowerSO-10 VIPER53SPTR-E

The STMicroelectronics OFF line primary switch combines an enhanced current mode PWM controller with a high voltage MDMesh Power Mosfet in the same package. Typical applications cover offline power supplies with a secondary power capability ranging up to 30W in wide range input voltage, or 50W in single European voltage range and DIP 8 package,

Under voltage lockout with hysteresis
High voltage startup current source
Over temperature protection
Overload and short circuit control