tb6548f TOSHIBA Semiconductor CORPORATION, tb6548f Datasheet - Page 7

• Manufacturer Part Number: tb6548f
• Description: Three-phase Full-wave Pwm Sensorless Controller For Brushless Dc Motors
• Manufacturer: TOSHIBA Semiconductor CORPORATION

Induced voltage
Turn-on signal
(1) Lead angle: 0 degree
(2) Lead angle: 7.5 degrees
(3) Lead angle: 15 degree
(4) Lead angle: 30 degree
Induced voltage
Turn-on signal
(1) Lead angle: 0 degree
(2) Lead angle: 7.5 degrees
(3) Lead angle: 15 degree
(4) Lead angle: 30 degree
6. Lead Angle Control
7. Lap Turn-on Control
started, automatically changes to the lead angle which has been set using LA0 and LA1. However, if both
LA0 and LA1 are set for High, the lead angle is 30 degrees in the starting forcible commutation as well as
in normal commutation.
starts.
longer (shaded area in the below chart) so as to create some overlap when switching turn on signals. The
lap time differs depending ong the lead angle setting.
OUT_UP
OUT_UN
OUT_VP
OUT_VN
OUT_WP
OUT_WN
OUT_UP
OUT_UN
OUT_VP
OUT_VN
OUT_WP
OUT_WN
OUT_UP
OUT_UN
OUT_VP
OUT_VN
OUT_WP
OUT_WN
OUT_UP
OUT_UN
OUT_VP
OUT_VN
OUT_WP
OUT_WN
OUT_UP
OUT_UN
OUT_VP
OUT_VN
OUT_WP
OUT_WN
OUT_UP
OUT_UN
OUT_VP
OUT_VN
OUT_WP
OUT_WN
OUT_UP
OUT_UN
OUT_VP
OUT_VN
OUT_WP
OUT_WN
OUT_UP
OUT_UN
OUT_VP
OUT_VN
OUT_WP
OUT_WN
The lead angle is 0 degree during the starting forcible commutation and when normal commutation is
When SEL_LAP = High, the turn-on degree is 120 degrees. When SEL_LAP = Low, Lap Turn-on Mode
In Lap Turn-on Mode, the time between zero-cross point and the 120 degrees turn-on timing becomes
30 degrees
15 degrees
22.5 degrees
PWM control
PWM control
PWM control
PWM control
U
U
PWM control
PWM control
7
PWM control
PWM control
PWM control
PWM control
V
V
PWM control
PWM control
PWM control
PWM control
PWM control
PWM control
PWM control
PWM control
W
W
2001-08-28
TB6548F
PWM control
PWM control
PWM control
PWM control