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TB6548F Datasheet(PDF) 7 Page - Toshiba Semiconductor |
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TB6548F Datasheet(HTML) 7 Page - Toshiba Semiconductor |
7 / 13 page TB6548F 2001-08-28 7 6. Lead Angle Control The lead angle is 0 degree during the starting forcible commutation and when normal commutation is 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. 7. Lap Turn-on Control When SEL_LAP = High, the turn-on degree is 120 degrees. When SEL_LAP = Low, Lap Turn-on Mode starts. In Lap Turn-on Mode, the time between zero-cross point and the 120 degrees turn-on timing becomes 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. (3) Lead angle: 15 degree OUT_WN OUT_VN OUT_WP Induced voltage Turn-on signal (1) Lead angle: 0 degree OUT_UP OUT_UN OUT_VP OUT_VN OUT_WP OUT_WN (2) Lead angle: 7.5 degrees OUT_UP OUT_UN OUT_VP OUT_UP OUT_UN OUT_VP OUT_VN OUT_WP OUT_WN (4) Lead angle: 30 degree OUT_UP OUT_UN OUT_VP OUT_VN OUT_WP OUT_WN U V W 30 degrees 22.5 degrees 15 degrees PWM control PWM control PWM control PWM control PWM control PWM control PWM control PWM control PWM control PWM control PWM control (3) Lead angle: 15 degree OUT_WN OUT_VN OUT_WP Induced voltage Turn-on signal (1) Lead angle: 0 degree OUT_UP OUT_UN OUT_VP OUT_VN OUT_WP OUT_WN (2) Lead angle: 7.5 degrees OUT_UP OUT_UN OUT_VP OUT_UP OUT_UN OUT_VP OUT_VN OUT_WP OUT_WN (4) Lead angle: 30 degree OUT_UP OUT_UN OUT_VP OUT_VN OUT_WP OUT_WN U V W PWM control PWM control PWM control PWM control PWM control PWM control PWM control PWM control PWM control PWM control PWM control |
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