Motor pre-driver simplifies speed control
The ZXBM1021 from Diodes is a variable speed control solution for cooling fans, blowers, extractors, motors and pumps deployed in a variety of consumer and industrial products.
The single phase, brushless dc motor pre-driver integrates an array of normally external components, including a pwm integrator and mosfet buffers. Diodes says it enables designers to simplify system architecture and reduce overall board component count.
The pre-driver can closely control motor speed via the direct application of either an external pwm signal, dc voltage signal or thermistor network input. Through the integration of Hall bias and amplifier circuits, compatibility with all types of Hall effect sensor is assured.
An open-collector frequency generator pin provides a tachometer output enabling external monitoring of rotation and speed. To prevent motor stalling or speed falling below a minimum value in the event of loss of control signals, the ZXBM1021 allows the setting of a minimum speed.
