FET pre-driver for motor control

6 February 2008 Analogue, Mixed Signal, LSI

Freescale has introduced a versatile field effect transistor (FET) pre-driver designed for three-phase motor control in a wide range of automotive and industrial control applications.

The MC33927 provides a cost-effective, comprehensive solution for cooling fans, water pumps, fuel pumps, and electro-hydraulic and electric power steering used in automobiles, electric scooters and electric-assist bicycles. These applications require synchronous and asynchronous three-phase motors to combine high output performance, high reliability and small size for space-constrained designs.

Based on Freescale's SMARTMOS technology, the MC33927 integrates features such as support of the entire automotive range from 6 V to 58 V, programmable dead time delay, pulse width modulation from 0% to 100% control of the load for increased motor efficiency and control, and extensive diagnostic and self protection capabilities.

The device's logic interfaces easily with the latest 3 V systems, as well as established 5 V platforms. The MC33927 interfaces an MCU via six direct input control signals, a serial peripheral interface (SPI) port for device setup, and asynchronous reset, enable and interrupt signals.

The device is designed to enable precision control of motor speed, torque and power. The phase control logic prevents both high-side and low-side FETs from conducting simultaneously and has a programmable dead-time from 0 μs to more than 10,5 μs. This complementary phase control logic can be turned off for explicit control of each driver, a desirable feature for switched reluctance applications.

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