■ Overview

The AN8021S is a switching power supply control IC that controls the power supply from the primary side. It is optimal for relatively small switching power supplies. All rarely used functions have been removed from the AN8021S and as a result it is an extremely easy-to-use compact device. Furthermore, internal settings are implemented as many as we can, cost cut is possible with reduced external parts.

■ Features

• Supports operation at switching frequencies up to 700 kHz and achieves a 35 ns output rise time and a 25 ns output fall time.

• Extremely low pre-startup current consumption of 70 µA (typical) allows a significantly smaller startup resistor to be used.

• Totem pole circuit structure adopted in the output block.

• Output current absolute maximum rating of ±1.0 A (peak) for direct driving of power MOSFET.

• Pulse-by-pulse overcurrent protection circuit

• Low voltage malfunction prevention circuit On/off: 14.2 V/9.2 V

• Timer latch and overvoltage protection functions

• Package: SONF-8D

■ Applications

• Switching power supplies