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DC motor controller features reduced noise

Posted: 31 Jan 2007 ?? ?Print Version ?Bookmark and Share

Keywords:driver? controller? DC motosr? Atmel? SMARTIS?

Atmel Corp. has announced the availability of the new ATA6831 driver IC with enhanced PWM performance for smooth DC motor control with reduced noise. The device is designed to control, via an MCU, two DC motors or up to three different loads in automotive and industrial applications such as flap control for a cash dispenser. The device has a high voltage capability (up to 40V) that enables it to be used in 24V-supplied truck applications. Since the device is manufactured using Atmel's high-voltage BCD-on-SOI technology (SMARTIS), the IC promises a broad range of protection features and an attractive price.

Enhanced PWM frequency
The small, low-cost ATA6831 is a fully protected, triple half-bridge driver with integrated power stages. Each of the three high-side and three low-side drivers is capable of driving currents up to 1A. The device supports the application of H-bridges to drive DC motors. With an enhanced PWM frequency of up to 25kHz, which is outside the human acoustic range, the DC motor control is carried out without any audible noise caused by the PWM signal. The reverse, brake and high impedance operation modes are controlled by the SPI interface.

The ATA6831 provides several protection features such as over-temperature warning and shutdown, overload, overvoltage protection and full protection against short circuits. Several diagnostic bits are set in the SPI output register and can be read by the MCU. In case of undervoltage at the supply pin, the power-supply fail bit in the output register is set and all outputs are disabled. If the overtemperature pre-warning bit is set, the system developer can implement software routines on the MCU to decrease the power dissipation and temperature. Further temperature increases beyond a certain level will cause the IC to shut down to prevent destruction. The device also meets strict automotive qualification demands (protection against conducted interference, EMC and ESD protection) and can withstand transients as specified in ISO/TR 7637.

Availability and pricing
Samples of the ATA6831 driver IC are available today in Pb-free QFN18 packages with pricing starting at 99 cents for 10,000-piece quantities. An application board for development support can be ordered for $131. For applications with ambient temperatures of up to 150C, the high-temperature derivative ATA6832 is available.

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