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| ST STCC08 AC开关驱动方案 |
| 作者： 时间：2008-09-12 来源:eaw |
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ST公司的STCC08是业界首个AC开关驱动器,满足IEC60335-1和IEC60730-1安全标准. STCC08能驱动AC开关,并能把开关的故障信息告知MCU,使MCU能采取适当措施是系统处于安全状态. STCC08工作电压3.3V和5V,和ACS,ACST,TRIAC兼容.具有可调整的栅极驱动电流,主要应用在家用电器, ACS, ACST, TRIAC 驱动以及AC开关故障模拟检测和零电压同步.本文介绍了STCC08的主要特性和优势, 电路方框图和多用应用电路图.
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.
STCC08主要特性:
■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
STCC08主要优势:
■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
STCC08主要应用:
■Home appliances
■ACS, ACST, TRIAC drive
■AC switch failure modes detection
■Zero voltage synchronization
图1.STCC08电路方框图
图2.采用MCU直接驱动+ACS的应用案例图
图3.STCC08非绝缘应用电路方框图
图4.ZVS应用电路图
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