ta84005f TOSHIBA Semiconductor CORPORATION, ta84005f Datasheet - Page 6

• Manufacturer Part Number: ta84005f
• Description: Three-phase Full-wave Pwm Sensorless Controller For Brushless Dc Motors
• Manufacturer: TOSHIBA Semiconductor CORPORATION

5. Positional Variation
Positional signal
occurs in connection with the frequency of the PWM signal. Take particular care if using the IC for
high-speed motors.
PWM signal
Output voltage
of the
TA84005F/FG
Since positional detection is performed in synchronization with the PWM signal, positional variation
Variation is calculated by detecting at two consecutive rising edges of the PWM signal.
1/f
p
< Detection time variation < 2/f
Reference voltage
Ideal detection timing
p
Pin voltage
f
p
: PWM frequency
6
Actual detection timing
TB6548F/FG
2006-03-02