VIPER28 is an off-line high voltage converter with an 800V rugged power section, PWM control, adjustable over-current and over-voltage protection, hysteretic thermal protection, soft-start, and safe auto-restart functionality.
The VIPER28 is an off-line converter IC designed for auxiliary power supplies in consumer and home equipment, including ATX auxiliary power supplies and low to medium power AC-DC adapters. The device features an 800 V avalanche rugged power section and operates in PWM mode with frequency jittering to reduce EMI. It includes multiple protection mechanisms such as adjustable current limiting, over-voltage protection, hysteretic thermal shutdown, and safe auto-restart after fault conditions.
| Drain-to-source voltage | 800 V |
|---|---|
| Operating frequency (L type) | 60 kHz |
| Operating frequency (H type) | 115 kHz |
| Standby power | < 50 mW |
| Operating junction temperature | -40 to 150 °C |
| Maximum duty cycle | 70-80 % |
The maximum drain-to-source voltage rating is 800 V.
The operating frequency is 60 kHz for L type and 115 kHz for H type.
The standby power consumption is less than 50 mW at 265 VAC.