■Overview

The AN8028 is an IC developed for controlling the self-excited switching power supply employing the RCC pseudo-resonance type control method. It is compact, equipped only with the necessary minimum functions. The maximum on-period and the minimum off-period can be set separately by using the external capacitor and resistor respectively. It is suitable for the power supply of AV equipment.

■Features

•Operating supply voltage range:

Stop voltage (8.6 V typical) to 34 V

•Output block employs the totem pole system.

•Power MOSFET can be directly driven.

(output peak current: ±1 A maximum)

•Small pre-start operating current (95 µA typical) allows using a small size start resistor.

•Built-in pulse-by-pulse overcurrent protection function

•Incorporating the protection circuit against malfunction at low voltage (start/stop: 14.9 V/8.6 V)

•Built-in overvoltage protection function (externally resettable)

•Built-in timer latch function

•Equipped with frequency (VF) control function.

•9-pin single inline package expands the freedom of board design