DRV10866EVM: 3-Ph Brushless DC (BLDC), 820mA, 2 ~ 5.5V

The DRV10866EVM is a complete solution for evaluating the DRV10866 5-V, three-phase sensorless BLDC motor driver. It includes a TLC555 timer configured to supply a PWM to the DRV10866, a potentiometer to adjust the speed of the motor by varying the duty cycle of the PWM, a jumper on the FG pin to allow the use of an external pull up resistor, and a jumper on the FGS pin to set ½ or normal frequency output on the FG pin. Power can be provided with the included micro-USB cable for 5 V or externally provided, up to 5.5 V, through the power header. The PWN, FG, and GND signals are all brought out to surface mounted test points.

The overcurrent threshold setup pin sets the current limit for the device and is connected to a 3.8-kΩ resistor (R6) on the DRV10866EVM. This sets the current limit at 820 mA for the DRV10866. This resistor can be replaced and a new current limit set using the equation seen below. Please see the datasheet for the DRV10866 for more information on the overcurrent threshold setup pin.