The HF500-30 from Monolithic Power Systems is a fixed-frequency, current-mode regulator with built-in slope compensation. It combines a 700 V 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 a light-load condition, the regulator freezes the peak current and reduces its switching frequency to 25 kHz 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, overload protection, short circuit protection, input over-voltage protection, VCC over-voltage protection, and over-temperature protection. The HF500-30 features over-power line compensation to ensure that the overload protection point is independent of the input voltage.
The device is available in a PDIP8-7B package. Applications include the likes of power supplies for home appliances, set-top boxes, standby and auxiliary power, and power adaptors.
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