onsemi AC DC Converters, Offline Switches FAN501ARMPX

The FAN501ARMPX is an offline PWM controller designed for charger applications, featuring WSaver® technology that ensures ultra-low standby power consumption, meeting Energy Star's 5-Star level requirements. It operates in both discontinuous conduction mode (DCM) and continuous conduction mode (CCM) while providing constant-current control without the need for secondary-side feedback circuitry. The device incorporates a dual-frequency function that adjusts the switching frequency based on input voltage to enhance transformer utilization and efficiency. This controller is characterized by high power density and conversion efficiency, making it suitable for compact charger applications. It includes features such as frequency hopping to minimize EMI noise, high-voltage startup capability, and precise maximum output power regulation through external resistor adjustment. Additionally, it offers programmable over-temperature protection and various voltage protection mechanisms, including under-voltage lockout (UVLO) and over-voltage protection (OVP). The FAN501ARMPX is packaged in a compact 10-lead MLP format, making it a viable option for battery chargers for smartphones, feature phones, and tablet PCs, as well as AC-DC adapters for portable devices requiring constant voltage and constant current control.