HF920 Flyback Regulators Monolithic Power Systems (MPS) HF920 Flyback Regulators are fixed-frequency offline regulators with ultra-low standby power consumption. These regulators provide excellent power regulation with the help of a monolithic 900V/15Ω MOSFET and a high-voltage current source. The proprietary monolithic process enables Over-Temperature Protection (OTP) on the same silicon as the 900V power MOSFET, offering the most precise thermal protection. In addition, HF920 provides a full suite of protection features such as VCC Under-Voltage Lockout (UVLO), Overload Protection (OLP), Over-Voltage Protection (OVP), and Short-Circuit Protection (SCP).