AC line switch basic application

ACS120

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DS3279 Rev 5

2

AC line switch basic application

The ACS120 device is well adapted to washing machine, dishwasher, tumble drier,

refrigerator, air-conditioning systems, and cookware. It has been designed especially to

switch on and off low power loads such as solenoid, valve, relay, dispenser, micro-motor,

pump, fan and defrost heaters.

This AC switch is triggered by a negative gate current flowing out of the gate pin G. It can be

driven directly by the digital MCU through a resistor as shown on the typical application

diagram.

Thanks to its thermal and turn-off commutation performance, the ACS120 switch can drive,

with no additional turn-off snubber, an inductive load up to 2 A.

Figure 14. Typical application diagram

2.1

Protection against overvoltage: the best choice is ACS

In comparison with standard Triacs the ACS120 is over-voltage self-protected, as specified

by the new parameter VCL. This feature is useful in two operating conditions: in case of turn-

off of very inductive load, and in case of surge voltage that can occur on the electrical

network.

MCU

M

AC Mains

Rg

Vdd

Vss

OUT

COM

G