STMicroelectronics STEVAL-GLA001V1 User Manual page 37

Considering this current value and the VCC_AC minimum voltage, the gate resistor calculation is:
R103 + R104 =
The nearest normalized values are 560 Ω.
You can calculate maximum power in the resistors considering the VCC_AC maximum voltage:
Therefore, R103 and R104 are 560 Ω/0.5 W resistors.
Note: Use the above formulas to recalculate resistor values in case of schematic use in another design with a different
ambient temperature.
UM2304 - Rev 3
I G min =
R111
V R103 + R104
=
I G min
V R103 + R104 V CC_AC min + V GT max − V CEsat
I G max = =
R103 + R104
P R103 = R103 × I G max
V GT
1
+ 14 mA = + 8 mA = 12.5 mA
220
V CC_AC min + V GT max − V CEsat
I G min
R103 + R104
2
= 0.21 W
UM2304
AC switch gate control dimensioning
13 + 1 − 0.3
= = 1096 Ω
12.5 × 10 −3
21 + 1 − 0.3
= = 19 mA
1120
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