Application notes:

1. Power and ground lines

F-GND and VSS should be connected together on board.

2. Power supply bypass capacitor & TVS zener diodes

The capacitor C1on VCC provides power supply stabilization for both PWM drive and kickback

absorption. When a diode is used to prevent destruction of controller IC from reverse connection, please

make sure to add capacitor C1 for routing of regenerative current, In order to protect surge voltage

damage, please insert a TVS zener diode between GND and VCC.

3. Hall input

The Hall sensor input circuit consists of a comparator with hysteresis of 20mV. Hall sensor input level

with at least three times of this hysteresis, i.e. at least 60mVp-p is recommended.

4. FG output

This is an open collector output, the pin must be left open if unused. FG output is used to reflect rotation

count, which corresponds to the phase switching. When lock protection , it will be zero all the time.

5. HB pin

This pin provides constant-voltage output of 1.25V for hall effect sensor biasing.

6. SMIN pin

This pin is used to set minimum speed by adjusting external resistors.

SMIM can only be used in 12V application. If 24V application, please connect 1M ohm resistor to VCC.

7. Motor capacitor

Insert a capacitor between the MOTU and MOTV pin if the noise is a problem.

8. Motor terminal schottky diode

Please insert schottky diode between the motor terminal and VCC for bigger current.

9. Motor terminal zener diode

Please insert zener diode between the motor terminal and VSS for routing of regenerative current

HM2602