Datasheet TB9062FNG (Toshiba) - 9

TB9062FNG (Note) • In the case that the DC excitation time period is too short, there is the possibility that forced commutation is started before setting motor rotor on the pre-setting position and cannot start proper sensorless operation. In the case that the setting time of DC excitation is too long during DC excitation, DC current is released between 2 phases and there is possibility to damage the external MOSFET. Please consider appropriate time period based on the system. • Regardless of lead angle, electrical angle of first forced commutation is 30°.
7.2.3. Auto start up PWM duty control
During sensorless start up sequence, i.e. DC excitation and force commutation, the input PWM duty is ignored and the output PWM duty is automatically set according to VBAT as following table for stable torque generation.
Fig. 7.2.3 Automatic start up duty control Table 7.2.3 Start up output PWM duty
VBAT PWM Duty < 6.25V 100% 6.25V to 7.03V 90% 7.03V to 7.81V 81% 7.81V to 8.59V 73% 8.59V to 9.38V 67% 9.38V to 10.16V 61% 10.16V to 10.94V 57% 10.94V to 11.72V 53% 11.72V to 12.50V 50% 12.50V to 13.28V 47% 13.28V to 14.06V 44% 14.06V to 14.84V 42% 14.84V to 15.63V 39% 15.63V < 37% © 2019 9 / 30 Toshiba Electronic Devices & Storage Corporation 2019-08-05