ACST8

3/10

Table 6: Electrical Characteristics per Switch

For either positive or negative polary of pin OUT voltage respect to pin COM voltage

1. AC LINE SWITCH BASIC APPLICATION

The ACST8-8C device is especially designed to drive medium power induction motors in washing ma-

chines, refrigerators, dish washers, and tumble dryers.

Pin COM

: Common drive reference, to be connected to the power line neutral

Pin G

: Switch Gate input to be connected to the controller

Pin OUT

: Switch Output to be connected to the load

When driven from a low voltage controller, the ACST switch is triggered with a negative gate current flow-

ing out of the gate pin G. It can be driven by the controller through a resistor as shown on the typical appli-

cation diagram. In appliance systems, the ACST8-8C switch intends to drive medium power load in ON /

OFF full cycle or phase angle control mode.

Thanks to its thermal and turn-off commutation characteristics, the ACST8-8C switch is able to drive an

inductive load up to 8A without a turn-off aid snubber circuit.

In washing machine or drier appliances, the tumble rotates in both directions. When using bidirectional

phase shift induction motor, two switches are connected on each side of the phase shift capacitor: in

steady-state operation, one switch only conducts energising the coils and defining the tumble direction.

Symbol

Test conditions

Values

Unit

Repetitive peak off-state voltage

MAX.

800

V

MAX.

30

mA

MAX.

1.5

V

MIN.

0.2

V

Gate open

MAX.

40

mA

MAX.

70

mA

MAX.

1.5

V

MAX.

0.95

V

MAX.

50

m

Ω

MAX.

10

µA

MAX.

1

mA

dV/dt

gate open

MIN.

750

V/µs

(dI/dt)c

Without snubber

MIN.

4.5

A/ms

TYP.

1200

V