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AN1172 Datasheet(PDF) 3 Page - STMicroelectronics |
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AN1172 Datasheet(HTML) 3 Page - STMicroelectronics |
3 / 23 page AN1172 ACS triggering mode 3/23 1 ACS triggering mode 1.1 Negative gate current The ACS silicon structure is different from the triac one. For instance, the gate embeds a diode junction. Then the gate current can only circulate in one direction, from the COM pin to the Gate one. A peak reverse voltage (VGM) of this junction is also defined in the ACS data sheet. In order to sink a current from the gate by a microcontroller output port, the supply voltage positive terminal must be connected to the drive reference, i.e. the COM pin of ACSs (see Figure 1.). An interesting benefit of such a connection is that the ACS is not fired when the MCU is at reset state. Indeed, in this case, all the MCU port pins are at high level. This means that the gate resistors are all connected to the COM terminal. No spurious triggering can then occur. It should be noticed that for a direct switch / MCU connection, the MCU current capability is not the only point to check to decide if the buffer circuit can be removed. Actually, the transistor, used to amplify the MCU current in order to control the gate, also play an overvoltage protection role. Annex B gives the gate voltage limits between which the MCU output port will be not stressed. It is also shown that with ACSs, the gate voltage remains inside these limits even with worst cases of dI/dt gradients at turn-on. Figure 1. Gate / MCU connection MCU Vdd Vss M1 M2 D1 D2 R I R Com Vg G Valve / PUMP etc. AC MAINS L N Iout Vs |
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