Sensorless Three-Phase Controller Drives Automotive Brushless DC Motors?

22 June 2016

ON Semiconductor has expanded its portfolio of motor controllers with the LV8907UW. Supporting an operating voltage range from 5.5 to 20 V (4.5 to 40 V transient), this controller enables streamlined solutions for driving three-phase brushless motors. The LV8907UW integrates gate drivers for six N-channel MOSFETs, and a dual-stage charge pump for 100% duty-cycle operation.

LV8907UW three-phase motor controller for automotive brushless DC motors. Source: ON Semiconductor.   LV8907UW three-phase motor controller for automotive brushless DC motors. Source: ON Semiconductor.

In its lowest cost configuration, the IC can operate without an external microcontroller. The device requires no programming, as key parameters and functions—such as startup and speed setting—can be configured via SPI interface and stored in embedded non-volatile (OTP) memory. Open-loop and closed-loop speed control are possible.

For more complex applications, the LV8907UW can also support a small microcontroller with its integrated linear regulator (3.3 V or 5 V, 50mA), a local interconnect network transceiver for automotive connectivity, and a watchdog timer.

AEC-Q100 qualified, the LV8907UW’s operational temperature range reaches up to 175° C, thereby ensuring reliable operation in automotive environments. Integrated protection mechanisms include over-current, over-voltage, short circuit, under-voltage and over-temperature. The device is suited for automotive water pumps, oil pumps, fuel pumps, HVAC systems, radiator fans and headlamp cooling units.

The LV8907UW is supplied in a SQFP48K package. List price is $5.55 each in 2,500-unit quantities.

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