TB6548F_06 TOSHIBA [Toshiba Semiconductor], TB6548F_06 Datasheet - Page 6

• Manufacturer Part Number: TB6548F_06
• Description: Three-Phase Full-Wave PWM Sensorless Controller for Brushless DC Motors
• Manufacturer: TOSHIBA [Toshiba Semiconductor]

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