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AN2716 Datasheet(PDF) 9 Page - STMicroelectronics

Part # AN2716
Description  STCC08 application guidelines
PDF  28 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2716 Datasheet(HTML) 9 Page - STMicroelectronics

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AN2716
STCC08 description
Doc ID 14460 Rev 2
9/28
Equation 2
The resistor RShunt is used to detect the AC switch state whatever the AC load state is
(connected or disconnected). Without this resistor, the STCC08 AVF signal remains at low
level (GND) whatever the AC switch state when the AC load is disconnected (IAC = 0). To
detect the AC switch state when the AC load is disconnected (with the resistor RShunt), the
IAC-peak current remains higher than the IACT_Max current (IAC current threshold to ensure
the AC switch state detection - see Table 2). Equation 3 defines the condition on RAC and
RShunt resistors to ensure a right AC switch states detection in the worst case (if the AC load
is disconnected). For example, with VLine_RMS_Min = 230 V - 10%, the RAC resistor value
plus the RShunt resistor value must be lower than 1.24 MΩ.
Equation 3
To limit the power dissipation by resistors RAC and RShunt lower than ¼ W and their
influences on the AC load, a 300 k
Ω and 100 kΩ minimum value is recommended
respectively under 230 V rms and 100 V rms AC line. Equation 4 and Equation 5 give the
power dissipation for RAC and RShunt in the worst case.
Equation 4
Equation 5
1.4.3
AC switch failures detection during normal operation
Knowing the STCC08 IN input state, the MCU is able to determine the AC switch state by
analyzing the AVF signal. Figure 8 andTable 3 give the AC switch failure modes according to
the AVF signal state and the STCC08 IN signal state. In case of AC switch failure, the MCU
can put the appliance in a safe configuration by switching off an appliance front-end relay.
()
mA
I
V
R
max
peak
AC
max
rms
Line
min
AC
2
.
2
2
_
_
_
_
_
X
>
max
ACT
min
rms
Line
max
AC
max
Shunt
I
V
R
R
_
_
_
_
_
2 X
<
+
(236 µA)
min
AC
max
rms
Line
max
RAC
R
(V
(P
)
_
_
_
=
)
2
min
Shunt
max
rms
Line
max
RShunt
R
(V
(P
)
_
_
_
=
)
2



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