For system flexibility the motor speed can be controlled by a DC voltage signal from either external control voltage or a PWM signal. The pre-driver output with source and sink capability of 100mA to drive external power switch allows power levels to be adjusted to suite motor requirements. The device has a supply voltage range of 6.8V to 18V (which can be extended with an external voltage regulator) and the operating ambient temperature range of -40°C to 110°C.

To simplify system circuit and minimize external components, the device integrates PWM signal integrator, Hall-Effect sensor amplifiers, Hall-bias supply, and voltage reference output. To prevent motor stalling or speed falling below a minimum value in absence of appropriate control signals, ZXBM1021 allows to set the minimum speed.

To prevent motor inrush current, the device has a soft start feature. To help protect the motor coil, the ZXBM1021 provides rotor lock protection which shutdown the output drive for a fixed period of time if rotor lock is detected. The device automatically restarts when the rotor lock is removed. The device monitors the motor current to provide a programmable over current limit.

To help minimize electromagnetic interference (EMI) , audible switching noise and shoot through challenges, ZXBM1021 provides a V+OP pin for low side drive outputs which allows to adjust the current into the base of external power transistors or to control external power MOSFETs’ turn-on speed different to turn-off speed.

A tachometer output is provided by open-drain Frequency Generator (FG) Pin which allows external interface to monitor motor rotation or speed. The FG output is the magnetic change frequency.

Features:

－ Operating Voltage: 6.8V to 18V

－ Speed control via external PWM, DC or Thermistor signals

－ Low noise, high efficiency

－ Soft start

－ Integrated current control

－ Reference voltage output

－ Built-in Hall amplifier for direct connection of Hall element

－ Rotor Lock Protection

－ Lock detection, output shutdown and automatic re-start

－ Minimum speed setting

－ Frequency generator (FG) output

－ Thermally enhanced space saving low profile U-QFN4040-20 package and industry standard QSOP-2 packages

－ Totally Lead-Free & Fully RoHS Compliant

－ Halogen and Antimony Free. “Green” Device