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ACS102-6T Datasheet(PDF) 6 Page - STMicroelectronics |
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ACS102-6T Datasheet(HTML) 6 Page - STMicroelectronics |
6 / 11 page 2 AC line switch - basic application ACS102-6T 6/11 2 AC line switch - basic application The ACS102-6T 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 13. Thanks to its overvoltage protection and turn-off commutation performance, the ACS102-6T switch can drive a small power high inductive load with neither varistor nor additional turn-off snubber. Figure 13. Typical application program 2.1 Protection against overvoltage: the best choice is ACS In comparison with standard triacs, which are not robust against surge voltage, the ACS102-6T is over-voltage self-protected, 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 clamping With 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 14 and Figure 15, 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 (5). AC Mains ACS102-6T Valve Power supply MCU Vdd Vss Rg |
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