2.5.7
Gate control: primary side (high voltage)
The AC switch gate control primary side contains three AC switches, the gate control circuit and optional
components which can be implemented to improve AC switch performance.
Figure 13.
STEVAL-GLA001V1 evaluation board AC switch gate control (primary side) components
“VCC_AC”, “GND_AC”, “OUT1”, “G1I”, “OUT2”, “G2I”, “OUT3” and “G3I” tests points are available to measure
auxiliary voltage, AC switches output and gate voltage level.
Caution:
All these test points are referenced to high voltage.
See
Section 12 AC switch performance improvements
for more information on how to improve AC switch
performance.
2.5.8
Gate control: secondary side (insulated voltage)
The gate command signals are available on J202 (user board) and J203 (
connectors. The microcontroller voltage level is not important as the optocoupler LED is voltage compatible. The
G1 signal controls X101 Triac (OUT1, T1), the G2 signal controls X102 AC switch (OUT2, T2) and the G3 signal
controls X103 AC switch (OUT3, T3).
Figure 14.
STEVAL-GLA001V1 evaluation board AC switch gate control (secondary side) components
If the Gx signal is set to 0 (GND), the corresponding AC switch is turned off; if the Gx signal is set to 5 V, 3.3 V or
VDD, the corresponding AC switch is switched on.
“G1”, “G2”, “G3” and “GND” test points are available to measure gate command voltage level.
UM2304
Hardware function description
UM2304
-
Rev 3
page 11/46
