ACS102 ST Microelectronics, Inc., ACS102 Datasheet - Page 4

• Manufacturer Part Number: ACS102
• Description: ac Line Switch
• Manufacturer: ST Microelectronics, Inc.

ACS102-5Tx
HIGH INDUCTIVE SWITCH-OFF OPERATION
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
to 10 H); it can reach about 20 mJ and is dissipated in the clamping diode section. The ACS™ switch sus-
tains the turn off energy, because its clamping section is designed for that purpose.
Fig. 1: Turn-off operation of the ACS102 switch
with an electro valve: waveform of the gate current
I
4/8
AC LINE TRANSIENT VOLTAGE RUGGEDNESS
The ACS102 switch is able to withstand safely the AC line transient voltages either by clamping the low en-
ergy spikes or by breaking over under high energy shocks.
The test circuit of the figure 3 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 rate of increase is high as shown on figure 4. Such non repetitive test
can be done 10 times on each AC line voltage polarity.
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: ACS102 switch static characteristic.
Fig. 4: Current and Voltage of the ACS™ during
IEC61000-4-5 standard test with R = 150 , L = 5 H
& V
PP
= 2kV.
Vout (200 V/div)
dI/dt = 70 A/µs
I
H
I
OUT
H
and the inductance (up
Iout (2.5 A/div)
V
H
CL
, and the
V
OUT