ACS108 ST Microelectronics, Inc., ACS108 Datasheet - Page 4

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

ACS108-5Sx
HIGH INDUCTIVE SWITCH-OFF OPERATION
10 H); it can reach about 20 mJ and is dissipated in the clamping section that is especially designed for that
purpose.
AC LINE TRANSIENT VOLTAGE RUGGEDNESS
The ACS108 switch is able to safely withstand the AC line transient voltages either by clamping the low en-
ergy spikes or by breaking over under high energy shocks.
The test circuit in Figure 4 is representative of the final ACS™ application and is also used to stress the
ACS™ switch according to the IEC61000-4-5 standard conditions. Thanks to the load, the ACS™ switch
withstands the voltage spikes up to 2 kV above the peak line voltage. It will break over safely even on resis-
tive load where the turn-on current rise is high as shown in Figure 4. Such non-repetitive testing can be
done 10 times on each AC line voltage polarity.
4/8
At the end of the last conduction half-cycle, the load current reaches the holding current level I
ACS™ switch turns off. Because of the inductance L of the load, the current flows through the avalanche
diode D and decreases linearly to zero. During this time, the voltage across the switch is limited to the
clamping voltage V
The energy stored in the inductance of the load depends on the holding current I
Fig. 1: Turn-off operation of the ACS108 switch
with an electro valve: waveform of the gate current
I
Fig. 3: Overvoltage ruggedness test circuit for resistive
and inductive loads according to IEC61000-4-5
standard.
R = 150 , L = 5 H, V
G
SURGE VOLTAGE
, pin OUT current I
GENERATOR
AC LINE &
I
H
(200V/div)
V
OUT
(10 mA/div)
I
OUT
CL
OUT
.
PP
R
V
AC
= 2kV.
& voltage V
+ V
PP
T
ime (400µs/div)
L
V
D
OUT
CL
COM
S
= 650V
R
.
G
ON
= 220
OUT
ACSxx
G
Fig. 2: ACS108 switch static characteristic.
Fig. 4: Current and voltage of the ACS™ during
IEC61000-4-5 standard test with a 150
load & V
Vout (200 V/div)
PP
= 2kV.
I
H
dI/dt = 100 A/µs
I
OUT
H
and the inductance (up to
Iout (2 A/div)
V
CL
H
, and the
- 10 H
V
OUT