Transient-protected AC power switches ACST10 and ACST12 - rugged control of AC motors in home appliances The ACST10 and ACST12 series belongs to the ACS/ACST family using ASD (application-specific discrete) planar technology. These high-performance devices are adapted to home appliances or industrial systems. They embed a Triac structure and a high-voltage clamping device able to absorb the inductive turn-off energy and withstand line transients such as those described in the IEC 61000-4-x standards. The ACST10/12 devices have been designed to control medium-power loads up to 12 A, such as AC motors in home appliances. They also provide high transient thermal performance to manage compressor inrush currents or high-torque operating conditions in AC motors. New ACST10/12: easy but rugged application design In addition to the overvoltage ruggedness that all ACST provide, the ACST10/12 propose a static dV/dt specified at a minimum of 2000 V/μs, one of the highest noise immunity levels available on the market. Their voltage ruggedness and high immunity level, as well as being static switches (without moving parts), make the ACST10/12 the perfect solution to replace relays in the control of fridge compressors, which are connected Key features Triac structure with overvoltage crowbar technology Low IGT (< 10 mA) version, or high immunity (IGT < 35 mA) version High noise immunity: static dV/dt > 2 kV/µs Through-the-hole and SMD versions 24 hours a day to the mains. Compared to standard Triacs, the new ACST10/12 considerably simplify the power stage of AC load control circuits: no need for an RC circuit, varistor, or even gate buffer circuit. This new series secures operation, even in dense or harsh operating conditions, with minimal BOM for external components. Key benefits Enables equipment to meet IEC 61000-4-5 without any external protection High off-state reliability with planar technology Needs no external overvoltage protection Reduces the power passive-component count High immunity against fast transients described in IEC 6100-4-4 standards Target applications www.st.com/thyristors Compressor on/off control of fridges Drum motors in phase angle control mode Typical application diagram Universal motor Compressor Ro tor Stator AC mains Electronic starter PTC 12V AC mains Motor direction setting ACST 2 MCU logic circuitry 1 3 ACST Speed motor regulation Rg Electronic thermostat ACST Vcc Rg MCU Gate driver Power supply Drum motor in phase angle control mode Compressor on/off control ACST10 and ACST12 - especially designed for motor control The technical and standards constraints were taken into account at the design stage in order to make all the parameters of the ACST10/12 suitable for fridge-compressor control and universal drum motor control. Furthermore, in addition to the basic THB and HTRB reliability tests, several specific functional reliability tests have been performed such as overvoltage robustness test, repetitive 450 k cycles inrush current test, stalled rotor test and repetitive dI/dt robustness test. All the test conditions plus test results used for the qualification of the ACST10/12 series are summarized in the available qualification report. Product table Part number ITRMS (A) IGT (mA) dV/dt (V/µs) (di/dt)c (A/ms) Package ACST10-7CT 10 A 35 mA 2000 12 TO-220AB ACST10-7CFP 10 A 35 mA 2000 12 TO-220FPAB ACST10-7ST 10 A 10 mA 200 4.4 TO-220AB ACST10-7SFP 10 A 10 mA 200 4.4 TO-220FPAB ACST12-7CT 12 A 35 mA 2000 14 TO-220AB ACST12-7CG(-TR) 12 A 35 mA 2000 14 D²PACK ACST12-7ST 12 A 10 mA 200 5.3 TO-220AB ACST12-7SG(-TR) 12 A 10 mA 200 5.3 D²PACK © STMicroelectronics - March 2009 - Printed in Italy - All rights reserved The STMicroelectronics corporate logo is a registered trademark of the STMicroelectronics group of companies. ASD and ACS are trademarks of STMicroelectronics All other names are the property of their respective owners. For more information on ST products and solutions, visit www.st.com Order code: FLACST120309
