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Pre-driver with configurable phase commutation delay

Posted: 07 Apr 2005 ?? ?Print Version ?Bookmark and Share

Keywords:zetex? zxbm1015? pre-driver?

The ZXBM1015 pre-driver from Zetex includes a current monitor that enables supply current on start-up and stall to be kept permanently within OEM specifications. It produces a PWM output to drive an external H-bridge that in turn drives the motor windings, and its integral current monitoring circuit measures the voltage across a low value external resistor in the low side of the H-bridge and deduces how much current the motor is taking during each PWM cycle. If it takes too much, the pre-driver backs off the PWM drive to reduce the current drawn, explained the company.

Designed for variable or fixed speed control of single phase brushless DC fans, blowers and pumps, this new pre-driver IC is touted to be the first of its kind to offer a configurable phase commutation delay, which allows OEMs to accurately meet the requirements of different motor sizes. In addition, the ZXBM1015 has a fixed internal commutation delay of 100?s, which can be easily extended or reduced by the simple addition of an external resistor.

Zetex added that the flexibility of the ZXBM1015 solution is demonstrated by its compatibility with thermistor, voltage and PWM control inputs, which support fully adjustable motor speed control in a wide range of equipment.

With a built-in Hall amplifier, the device is compatible with any type of Hall-effect sensor and can provide, as a result, pulsed rotor speed and locked rotor alarm outputs. For a locked rotor condition, the ZXBM1015 puts motor drive outputs into a safe operating mode to protect the H-bridge and motor windings.

Additional features of the TSSOP20 packaged pre-driver include an adjustable minimum speed setting to prevent the motor from running either too slowly or not being able to start, and an automatic restart function.

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