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| AN2859 Datasheet, PDF (6/29 Pages) STMicroelectronics – Multiplexed diagnostics of AC switches using two STCC08 | |||
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Multiplexed diagnostics
AN2859
Figure 7. Case 5: VSTATE toggles between V1 and V3 at each AC line cycle
(except at each zero crossing of the AC line)
VCC
VAC
VCC/COM
ILoad_2
VAC
ACS2
STCC082
AVF
G
R1
R2
VAVF2
ILoad_2
ILoad_1
VAC
Line Load2 RAC AC
VCC
RShunt
IN2
VSTATE
VCC/COM
VAC
ILoad_1
ACS1
Line Load1
RShunt
RAC
R3
V3
STCC081
R4
AVF
V2
G
VAVF1
VSTATE
V1
AC
IN1
V0
ACS1 is failed in diode mode and ACS2 is not in conducting state
Figure 8. Case 6: VSTATE toggles between V2 and V3 at each AC line cycle
(except at each zero crossing of the AC line)
VCC
VAC
VCC/COM
ILoad_2
VAC
ACS2
Line Load2
RShunt
RAC
STCC082
AVF
G
AC
IN2
R1
R2
VAVF2
VCC
ILoad_2
ILoad_1
VSTATE
VAC
VCC/COM
ILoad_1
VAC
ACS1
Line Load1
RShunt
RAC
R3
V3
STCC081
R4
AVF
V2
G
VAVF1
VSTATE V1
AC
IN1
V0
ACS1 is not in conducting state and ACS2 is failed in diode mode
6/29
DocID15255 Rev 2
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