Application information

ASCT4

6/13

Doc ID 8766 Rev 5

2

Application information

2.1

Typical application description

The ACST4 device has been designed to control medium power load, such as AC motors in

home appliances. Thanks to its thermal and turn off commutation performances, the ACST4

switch is able to drive an inductive load up to 4 A with no turn off additional snubber. It also

provides high thermal performances in static and transient modes such as the compressor

inrush current or high torque operating conditions of an AC motor. Thanks to its low gate

triggering current level, the ACST4 can be driven directly by an MCU through a simple gate

resistor as shown Figure 16 and Figure 17.

Figure 16.

Compressor control – typical diagrams

Compressor

Electronic

starter

Electronic

thermostat

ACST

Rg

ACST

Power supply

AC Mains

Gate

Driver

logical circuitry

1

PTC

Compressor with integrated e-starter

Compressor

Start

switch

Run

switch

PTC

Rg

ACST

Power supply

Gate

Driver

ACST

Rg

AC Mains

Compressor with external electronic drive