MONOLITHIC POWER SYSTEMS (MPS) HF500GP-40

Fixed-frequency, current mode regulator with built-in slope compensation. The HF500-40 combines a 700V MOSFET and a full-featured controller into one chip for a low power, offline, flyback, switch-mode power supply. At medium and heavy loads, the regulator works in a fixed frequency with frequency jittering. Jittering helps reduce EMI energy on the switching frequency and its harmonics. During light-load condition, the regulator freezes the peak current and reduces its switching frequency to 25KHz to offer excellent efficiency. At very light loads, the regulator enters burst mode to achieve low standby power consumption. Full protection features include brown-in and brown-out, VCC under-voltage lockout (UVLO), OLP, SCP, input over-voltage protection, VCC over-voltage protection and over-temperature protection. The HF500-40 is available in a PDIP8-7B package. Typical applications include power supplies for home appliances, set-top boxes, adapters, standby and auxiliary power.