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ST takes wrap off AC-switch gate driver with supervisor IC

Posted: 09 Sep 2008 ?? ?Print Version ?Bookmark and Share

Keywords:solid-state switch driver? supervisor IC? logic signal?

STCC08 solid-state AC-switch driver

The STCC08 from STMicroelectronics is said to be 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 appliances annually.

In mains-powered appliances and electrical controls, using the STCC08 controller will ease the appropriate Failure Mode Effect Analysis (FMEA) process, as the device's own FMEA was integrated into its design and includes descriptions of 52 cases of failure, said ST. 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 techniques to detect true switch status, and generates a logic signal connected to a digital input of an 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 MCU, according to ST.

Designed for connection in parallel with the power path, the STCC08 is claimed to withstand EMI fast transients up to 4kV, thereby meeting IEC61000-4-4. The STCC08 can operate from 3.3V or 5V and is offered in a surface-mount ECPOACK SO-8 package. It is available at a unit cost of 27 cents in quantities of 50,000.

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