20 W flyback with 800 V MOSFET for universal-input supplies
The VIPER38LDTR integrates a 800 V avalanche-rugged power MOSFET and a PWM controller, delivering up to 20 W in a flyback topology without an external power switch. The 60 kHz fixed switching frequency keeps transformer design straightforward, while the 80% maximum duty cycle supports wide input-voltage ranges typical of offline AC-DC converters.
Parametric deep-dive: protection, supply, and thermal range
On-chip fault protection includes current limiting, over-voltage, over-temperature, and short-circuit — reducing the need for external sensing and latch-off circuitry. The Vcc supply range of 8.5 V to 23.5 V and a 14 V start-up threshold allow direct operation from the rectified bulk capacitor without an auxiliary winding pre-regulator in many designs.