STCC08 Datasheet, PDF (1/13 Pages) STMicroelectronics – AC switch failure mode detector

STCC08
AC switch failure mode detector
Features
■ 3.3 V and 5 V power supply compatible
■ ACS, ACST, TRIAC compatible
■ Gate driver output: 28 mA max sink current
■ Adjustable gate drive current
■ Sense the AC switch voltage in both AC line
polarities
■ Diode mode failure detection for solid state AC
switches
■ Short circuit failure detection for AC switches,
relays, electromechanical switches
■ Open AC switch detection for AC switches,
relays, electromechanical switches
■ SO-8 SMD package
Benefits
■ Enable appliances to meet IEC 60335-1 and
IEC 60730-1 standards
■ Enable appliances to meet IEC 61000-4-4
standard
■ Eliminates high DC current in inductive load, by
detecting the diode mode failure
■ Improve system safety monitoring open switch
failure with critical loads such as door locks
■ Enable MCU to sense all AC switch failure
modes and protect the appliance
■ Less MCU pin allocated to AC failure detection
multiple STCC08 designed with resistor
dividers uses one I/O
■ Easy to drive with MCU directly connected or
through an opto coupler
■ Highly compact with integrated solution in SMD
version
SO-8
Applications
■ Home appliances
■ ACS, ACST, TRIAC drive
■ AC switch failure modes detection
■ Zero voltage synchronization
Description
The STCC08 is an AC switch failure mode
detector and an AC power switch driver. It drives
the AC switch and informs the MCU of switch
failure. The MCU takes the appropriate actions to
put the system in a secure state.
Diode-mode, short circuit detection and open
switch in both AC line polarities are detected.
The STCC08 helps home appliances to meet the
IEC 60335-1 safety standard.
The STCC08 can be easily interfaced to an MCU
with its CMOS input AC switch driver and CMOS
compatible output for the failure mode detector.
March 2008
Rev 1
1/13
www.st.com
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