ST STEVAL-IHM020V1, User Manual, Page: 7 / 23

UM0583 STCC08 description
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2.2 Gate driver
The STCC08 can control up to 10mA IGT TRIACs, ACST and ACS through a “GATE
DRIVER” block designed:
●
to drive the AC switch according to the IN control input state:
– For IN = “1” = VCC: AC switch turn on
– For IN = “0” = GND: AC switch turn off
●
to regulate the gate current of the AC switch, thanks to the internal current controller
2.3 ACS failure detection
External resistors (R1, R2, R3 and R4) sense the voltage across the ACS. Using these
resistors, the STCC08 constantly monitors the ACS state. Knowing the STCC08 IN input
state, the ACS state can be deduced by analyzing the AVF signal.
Figure 6 gives the ACS
state according to the AVF signal state and the IN signal state.
Table 1. STCC08 pin definition
Pin Symbol Type Description
1 IN Signal AC switch drive
2 AVF Signal Alternating voltage feedback: AC switch state output
3 NC Not connected
4 AC Signal AC switch state sense input
5 VCC Power Positive power supply
6 G Signal AC switch gate driver output
7 RIG Signal AC switch gate current setting
8 GND Power Power supply reference
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