tb6537pg TOSHIBA Semiconductor CORPORATION, tb6537pg Datasheet - Page 8

• Manufacturer Part Number: tb6537pg
• Description: 3-phase Full-wave Sensorless Controller For Brushless Dc Motors
• Manufacturer: TOSHIBA Semiconductor CORPORATION

5. Positional Variation
6. Over-current protection function
in connection with the frequency of PWM signal. Be especially careful when the IC is used for high-speed
motors.
phase is turned on by the timing of the next PWM signal.
Since positional detection is performed in synchronization with PWM signal, positional variation occurs
Variation is calculated through detection at two consecutive rising edges of the PWM signal.
1/f
The active phase that controls the PWM is turned off by the rising-edge of the OC signal. The inactive
p
< Detection time variation < 2/f
Pin voltage
Positional signal
PWM signal
Reference voltage
Ideal detection timing
p
f
p
Pin voltage
: PWM frequency.
8
Actual detection timing
TB6537P/PG/F/FG
2006-3-6