AC motor switches

29 September 2010 Power Electronics / Power Management

STMicroelectronics has unveiled new AC switches that are designed for controlling appliance motors. They can be used without many of the additional components normally needed to ensure smooth switching and provide protection.

The latest-generation ACST4, ACST6 and ACST8 switches include a power triac delivering enhanced commutation performance to turn the motor off without requiring external components to suppress voltage transients and to ensure reliable switching. Unlike conventional triacs, the switches also integrate protection against surge voltages up to 2 kV on the AC line, in accordance with the international IEC 61000-4-5.

In addition, the ACST410 and ACST610 switches have a low trigger current of 10 mA, allowing direct control by a CMOS device such as a microcontroller, without requiring a buffer or driver. The ACST435 and ACST830 are high-immunity devices specifying noise immunity of at least 1000 V and 2000 V per microsecond, respectively, complying with the IEC 61000-4-4 fast transient burst test and eliminating any need for conditioning of the trigger signal.

The devices feature 4 A (ACST4), 6 A (ACST6) or 8 A (ACST8) maximum on-state current and a 100 A/μs turn-on rate. They have an 800 V blocking voltage and their TO-220FPAB (full-pack) package exhibits 1500 Vrms insulation. Surface-mount DPAK and D²PAK packages are also available .

For more information contact Robin Scholes, Avnet Kopp, +27 (0)11 809 6100, [email protected], www.avnet.co.za

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