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ACS108-6SA-ACS108-6SA-TR-ACS108-6SN-TR
Overvoltage protected AC switch
October 2013 DocID6518 Rev 5 1/13
ACS108Overvoltage protected AC switch (ACS™)
Datasheet - production data
Features Enables equipment to meet IEC 61000-4-5
surge with overvoltage crowbar technology High noise immunity against static dV/dt and
IEC 61000-4-4 burst Needs no external protection snubber or
varistor Reduces component count by up to 80% and
Interfaces directly with the micro-controller Common package tab connection supports
connection of several alternating current
switches on the same cooling pad VCL gives headroom before clamping then
crowbar action
Applications Alternating current on/off static switching in
appliances and industrial control systems Driving low power high inductive or resistive
loads like: relay, valve, solenoid, dispenser, pump, fan, low power motor, door lock
–lamp
DescriptionThe ACS108 belongs to the AC switch range
(built with A. S. D.® technology). This high
performance switch can control a load of up to 0.8
A. The ACS108 switch includes an overvoltage
crowbar structure to absorb the inductive turn-off
energy, and a gate level shifter driver to separate
the digital controller from the main switch. It is
triggered with a negative gate current flowing out
of the gate pin.
Figure 1. Functional diagram ®: A.S.D. is a registered trademark of STMicroelectronics
TM: ACS is a trademark of STMicroelectronics
Table 1. Device summary
Characteristics ACS1082/13 DocID6518 Rev 5
1 Characteristics
Table 2. Absolute maximum ratings (Tamb = 25 °C, unless otherwise specified) According to test described by IEC 61000-4-5 standard and Figure18
Table 3. Electrical characteristics (Tj = 25 °C, unless otherwise specified) Minimum IGT is guaranteed at 10% of IGT max
DocID6518 Rev 5 3/13
ACS108 Characteristics
Table 4. Static electrical characteristics For both polarities of OUT referenced to COM
Table 5. Thermal resistance
Figure 2. Maximum power dissipation versus
on-state rms current
Figure 3. On-state rms current versus case
temperature (SOT223)
Characteristics ACS1084/13 DocID6518 Rev 5
Figure 4. On-state rms current versus ambient
temperature (free air convection)
Figure 5. Relative variation of thermal
impedance junction to ambient versus pulse
duration
Figure 6. Relative variation of holding and
latching current versus junction temperature
Figure 7. Relative variation of IGT and VGT
versus junction temperature
Figure 8. Surge peak on-state current versus
number of cycles
Figure 9. Non repetitive surge peak on-state
current for a sinusoidal pulse, and
corresponding value of I²t
ACS108 Characteristics
Figure 10. On-state characteristics (maximum
values)
Figure 11. Relative variation of critical rate of
decrease of main current versus junction
temperature
Figure 12. Relative variation of static dV/dt
immunity versus junction temperature(1) Figure 13. Relative variation of leakage current
versus junction temperature VD = VR = 402 V: Typical values above 5 kV/µs. Beyond equipment capability
Figure 14. Relative variation of critical rate of
decrease of main current (di/dt)c versus
(dV/dt)c
Figure 15. Thermal resistance junction to
ambient versus copper surface under tab
(SOT-223)
Alternating current mains switch - basic application ACS1086/13 DocID6518 Rev 5
Alternating current mains switch - basic applicationThe ACS108 switch is triggered by a negative gate current flowing from the gate pin G. The
switch can be driven directly by the digital controller through a resistor as shown in
Figure 16.
Thanks to its overvoltage protection and turn-off commutation performance, the ACS108
switch can drive a small power high inductive load with neither varistor nor additional turn-off
snubber.
Figure 16. Typical application schematic
2.1 Protection against overvoltage: the best choice is ACSIn comparison with standard Triacs the ACS108 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.
2.1.1 High inductive load switch-off: turn-off overvoltage clampingWith high inductive and low rms current loads the rate of decrease of the current is very low.
An overvoltage can occur when the gate current is removed and the OUT current is lower
than IH.
As shown in Figure 17, at the end of the last conduction half-cycle, the load current
decreases ① . The load current reaches the holding current level IH ② , and the ACS turns
off ③ . The water valve, as an inductive load (up to 15 H), reacts as a current generator and
an overvoltage is created, which is clamped by the ACS ④ . The current flows through the
ACS avalanche and decreases linearly to zero. During this time, the voltage across the
switch is limited to the clamping voltage VCL . The energy stored in the inductance of the
load is dissipated in the clamping section that is designed for this purpose. When the energy
has been dissipated, the ACS voltage falls back to the mains voltage value (230 V rms, Hz)⑤.
DocID6518 Rev 5 7/13
ACS108 Alternating current mains switch - basic application
Figure 17. Switching off of a high inductive load - typical clamping capability of
ACS108 (Tamb = 25 °C)
2.1.2 Alternating current mains transient voltage ruggednessThe ACS108 switch is able to withstand safely the AC mains transients either by clamping
the low energy spikes or by breaking-over when subjected to high energy shocks, even with
high turn-on current rises.
The test circuit shown in Figure 18 is representative of the final ACS108 application, and is
also used to test the AC switch according to the IEC 61000-4-5 standard conditions. Thanks
to the load limiting the current, the ACS108 switch withstands the voltage spikes up to 2 kV
above the peak mains voltage. The protection is based on an overvoltage crowbar
technology. Actually, the ACS108 breaks over safely as shown in Figure 19. The ACS108
recovers its blocking voltage capability after the surge (switch off back at the next zero
crossing of the current).
Such non-repetitive tests can be done 10 times on each AC mains voltage polarity.
Figure 18. Overvoltage ruggedness test circuit for resistive and inductive loads, Tamb
= 25 °C (conditions equivalent to IEC 61000-4-5 standard)
