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EC motor driver packs protection mechanisms

Posted: 30 Dec 2009 ?? ?Print Version ?Bookmark and Share

Keywords:EC motor driver? interface? automotive?

From Elmos Semiconductor AG comes the E910.87 EC motor driver that pack flexible configuration options and diverse protection mechanisms that make it suitable for a wide range of automotive and industrial applications.

With the gate driver ICs for six NMOS FETs, the individual driver outputs can be controlled with up to 60kHz and the driver currents are adjustable from 40mA to 300mA. Control of the EC motor itself takes place via the power FETs of the three half-bridges (B6).

The charge pump applied allows duty factors for the high-side drivers of up to 100 percent. The motor control interface between microcontroller and motor driver IC consists of six pulse-width modulators (PWMs) for driving the six power transistors. Particularly for use with low performance microcontrollers, the E910.87 can also be installed so that three PWMs are sufficient for driving the power stage.

Further characteristics of the device include an integrated window watchdog, integrated free run comparators and motor current measurement with programmable amplification. Features such as amplification factor of current limitation, overcurrent threshold and error interrupts can be adjusted and configured in a simple and direct manner via the integrated SPI interface.

The diverse protection functions include protection against phase and gate short-circuits, cross-current protection, over-voltage and under-voltage protection for high-side and low-side driver supply, gate-source voltage limitation of high-side drivers and an over-temperature warning.

The EC motor driver E910.87 is designed for an extended temperature range of -40C to +125C and comes in a small 7mm x 7mm, 44-pin QFN package.

Samples and evaluation boards are available from Gleichmann Electronics.

- Paul Buckley
Power Management DesignLine Europe





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