Solid-State AC Switch Driver aids IEC60335 certification.September 12, 2008 -
Connected in parallel with power path, STCC08 offers integrated switch supervision to save board space and meet IEC60335-1/IEC60730-1 safety standards. Integrated Failure Mode Effect Analysis (FEMA) includes descriptions of 52 cases of failure, and supervisor capability meets IEC60335 by detecting short- or open-circuit failures as well as diode-mode failure of solid-state AC switch. Solution also detects true switch status and generates logic signal connected to digital input of MCU.
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Original Press release
STMicroelectronics
10 Maguire Road
Lexington, MA, 02421
USA
First AC-Switch Gate Driver and Supervisor IC from STMicroelectronics Reduces Complexity, Saves Space and Increases Reliability
Using STCC08, engineers can accelerate IEC60335 safety certification
GENEVA, Sept. 5 -- The STCC08 from STMicroelectronics (NYSE:STM), a world leader in power applications, is the first solid-state AC-switch driver to integrate switch-supervision, allowing designers to save board space and reduce workload with a straightforward solution for mains-powered devices designed to meet IEC60335-1 and IEC60730-1 safety standards. ST estimates that around 1.4 billion AC switches, which require designers to implement failure protection to meet international product acceptance criteria, are implemented in domestic appliances annually.
In mains-powered appliances and electrical controls, using the STCC08 controller will ease the appropriate FMEA (Failure Mode Effect Analysis) process, as the device's own FMEA was integrated into its design and includes descriptions of 52 cases of failure. The STCC08's supervisor capability meets IEC60335 by detecting short-circuit or open-circuit failures, as well as diode-mode failure of a solid-state AC switch in both half-AC-line polarities. The device uses unique techniques to detect true switch status, and generates a logic signal connected to a digital input of a microcontroller (MCU), which implements the diagnostic using a simple two-input truth table. In insulated applications, the STCC08 output is also able to drive an opto-transistor.
The STCC08's integrated switch gate driver is capable of sinking up to 25mA to drive a directly connected AC switch, and supports continuous, pulsed or angle-phase modes. The output current is regulated using an external resistor. The CMOS-compatible input enables direct connection to the microcontroller.
Designed for connection in parallel with the power path, the STCC08 delivers a robust solution able to withstand EMI fast transients up to 4kV, thereby meeting IEC61000-4-4. The STCC08 can operate from 3.3V or 5V, is offered in a surface-mount ECPOACK(R) SO-8 package, and is available now at a unit cost of $0.27 in quantities of 50,000.
About STMicroelectronics
STMicroelectronics is a global leader in developing and delivering semiconductor solutions across the spectrum of microelectronics applications. An unrivalled combination of silicon and system expertise, manufacturing strength, Intellectual Property (IP) portfolio and strategic partners positions the Company at the forefront of System-on-Chip (SoC) technology and its products play a key role in enabling today's convergence markets. The Company's shares are traded on the New York Stock Exchange, on Euronext Paris and on the Milan Stock Exchange. In 2007, the Company's net revenues were $10 billion. Further information on ST can be found at www.st.com.
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