ACS108 ST Microelectronics, Inc., ACS108 Datasheet - Page 3

• Manufacturer Part Number: ACS108
• Description: ac Line Switch
• Manufacturer: ST Microelectronics, Inc.

Table 1: Load grouping versus their turn off commutation requirement (230V AC applications).
TYPICAL APPLICATION DIAGRAM
AC LINE SWITCH BASIC APPLICATION
The ACS108 device is well adapted to washing machines, dishwashers, tumble driers, refrigerators, water
heaters and cookware. It has been especially designed to switch ON and OFF low power loads such as
solenoids, valves, relays, dispensers, micro-motors, fans, pumps, door locks and low power lamp bulbs.
Pin COM:
Pin G:
Pin OUT:
The ACS™ switch is triggered with a negative gate current flowing out of the gate pin G. It can be driven di-
rectly by the digital controller through a resistor as shown on the typical application diagram. No protection
devices are required between the gates and common terminals.
The SOT-223 version allows several ACS108 devices to be connected on the same cooling PCB pad
which is the COM pin : this cooling pad can be then reduced, and the printed circuit layout is simplified.
In appliance systems, the ACS108 switch intends to drive low power load in full cycle ON / OFF mode. The
turn off commutation characteristics of these loads can be classified in 3 groups as shown in Table 1.
Thanks to its thermal and turn-off commutation characteristics, the ACS108 switch drives a load, such as
door lock, lamp, relay, valve and micro motor, up to 0.2 A without any turn-off aid circuit. Switching off the
ACS within one full AC line cycle will extend its current up to 0.8 A on resistive load.
Relay Valve
Dispenser
Micro-motor
Pump Fan
Door Lock Lamp
LOAD
Common drive reference to connect to the power line neutral
Switch Gate input to connect to the digital controller through the resistor
Switch Output to connect to the Load
Load IRMS
Current
< 0.3
< 0.8
< 0.1
< 0.2
< 0.6
(A)
L
N
MAINS
AC
- Vcc
FACTOR
POWER
> 0.7
> 0.2
> 0.2
D
1
1
COM
S
ON
OUT
LOAD
L
R
G
ACS108
ST 72 MCU
(dI/dt)c
(A/ms)
< 0.05
< 0.1
< 0.3
0.15
0.4
(dV/dt)c
(V/ s)
0.15
0.15
< 10
< 10
< 5
ACS108-5Sx
TURN-FF
DELAY
(ms)
< 20
< 10
< 10
< 20
<10
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