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AN2716 bảng dữ liệu(PDF) 22 Page - STMicroelectronics

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Timing definitions
AN2716
22/28
Doc ID 14460 Rev 2
Figure 18.
AC load model definition
Equation 11
Considering Equation 11, t1 and t2 times are given respectively by Equation 12 and
Equation 13 in the worst case (to avoid the false detection of an AC switch failed in short-
circuit any time).
Equation 12
Equation 13
IAC_peak_min defines the minimum peak IAC current through the STCC08 AC input to ensure
the AC switch state detection. This current must be higher than the maximum specified IACT
parameter (IACT_max) in order to detect the AC switch state in the worst case (when the AC
load is disconnected). Equation 14 defines this condition. Indeed, when the AC load is
disconnected, the IAC current is limited by RAC and RShunt resistors. For example, with RAC
= RShunt = 300 kΩ (see Equation 2 and Equation 3), F = 50 Hz and VLine_RMS_min = 230 V -
10%, the IAC_Peak_min is 465 µA.
Equation 14
φAC is the phase shift between the AC line and the IAC current when the AC switch is off. As
the resistor RShunt value is higher than the most AC load impedances found in home
appliances, this phase shift depends only on the AC load characteristic and resistor RAC.
Figure 19 gives Fresnel's diagram for RAC = 0 and RAC ≠ 0 for the circuit in Figure 18 to
VCC
AC
Power switch
signal shaping
Neutral
STCC08
STCC08
RAC
RShunt
Load
LR
I AC
AC switch
()
(
)
AC
peak
AC
AC
t
F
I
t
I
ϕ
π
-
=·
·
·
2
sin
·
_
⎥
⎥
⎦
⎤
⎢
⎢
⎣
⎡
+
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
x
x
=
max
_
_
_
_
_
1
sin
·
2
1
AC
min
Peak
AC
max
ACT
min
Max
I
I
Ar
F
t
ϕ
π
⎥
⎥
⎦
⎤
⎢
⎢
⎣
⎡
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
+
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
-
x
x
=
max
AC
min
Peak
AC
max
ACT
max
min
I
I
Ar
F
t
_
_
_
_
_
2
sin
·
2
1
ϕ
π
π
max
AC
max
Shunt
min
rms
Line
min
Peak
AC
ACT_max (236 µA)
R
R
V
I
I
_
_
_
_
_
_
·
2
+
=>



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