STMicroelectronics STEVAL-GLA001V1, User Manual

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3.3.2 ON/OFF basic mode
Figure 20. ON/OFF control in basic mode (DC command on the left and pulse command on the right)
Triac push
button
Triac gate
command
V
MAINS
I
T
Current in the Triac
turns off at next
zero current
crossing
Wait for next zero voltage crossing
tp tp
push push
Triac push
button
Triac gate
command
V
MAINS
I
T
Current in the Triac
turns off at next
zero current
crossing
Wait for next zero voltage crossing
push push
This mode is selected through the MODE switch (refer to Section 3.3.1 Mode selection ).
After you push the AC switch/Load button (Tx) ON, the NUCLEO-F030R8 development board waits for the next
ZVS, lights ON the corresponding LED (LEDx) and then activates the corresponding AC switch gate (Gx).
To stop the AC switch/load, push the AC switch/Load button (Tx) ON again: the gate is deactivated and the LED
is switched OFF.
By default, the gate command is a pulsed signal with a duration equal to the “tp” value. You can modify this gate
ON duration by pushing on the “TP+” button (to increase ON time) or “TP-” button (to decrease ON time). The
gate command becomes a DC signal when the “tp” value reaches the half-period.
All parameters (range, default value, unit, step, etc.) used to configure the load control for this mode are
described in
Section 3.6 User interface . For more details regarding the hardware components involved in this
mode, refer to Section 2.5 Hardware function description .
UM2304
Operating mode
UM2304 - Rev 3
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