General Description

The AS1720A is a low side current source providing an optimized DC Operation for power saving and ultra low electromagnetic radiation.

The AS1720B is a low side switch providing a PWM output, which frequency is defined by an internal RC oscillator. The adjustable PWM allows a fine control of the power delivered to the load.

Key Features

■ Supply Range: +5V to +50V

■ Internal VDDA: 3.3V

■ Supply Current: 1 mA

■ Internal osc frequency: 30kHz

■ Fix delay: 136ms

■ Adjustable duty cycle: 20 – 90 (AS1720B only)

■ Adjustable energizing current: 10mA – 100mA

■ Adjustable hold current: 30 - 70 of energizing current

■ Current Limitation

■ Thermal shutdown: 150ºC

■ 8-pin MLPD (2x2mm) Package

■ On request SOIC 8 Package (reduced temperature range -40°C to +85°C)

Applications

The AS1720 is ideal for fluid and gas flow systems, industrial control, electrical heaters, motor speed control.