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STPM098C 数据表(PDF) 84 Page - STMicroelectronics |
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STPM098C 数据表(HTML) 84 Page - STMicroelectronics |
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84 / 110 page  3.14.6.5 Pulse merging (MULTIPULSE) In steady state condition the period imposed by the DCO for the single phase is always higher than the nominal ON time. Figure 68. T_on time, steady state TON TOFF PWM DVCO Pulse In case the DCO output period is forced to be reduced below the nominal ON time, STPM098C allows to select four different strategies for generating the ON/OFF timing through the MULTI_PULSE_STRAT register configuration. MULTI_PULSE_STRAT = 0x00 Pulse merger multiplies the ON time duration by the number of the DCO pulses received during the nominal ON time. If a DCO pulse is received during the minimum TOFF window the next ON time is generated after a minimum TOFF interval. Figure 69. T_on time with MULTI_PULSE_STRAT = 0x00 MIN TOFF DVCO Pulse PWM Behavior during TON generation Additional DVCO pulses generate new TON at the end of previous one Behavior during TOFF generation New TON generated after minimum TOFF MULTI_PULSE_STRAT = 0x01 Pulse merger restarts the nominal ON time generation each time a DCO pulse is received during the nominal ON time itself. If a DCO pulse is received during the minimum TOFF window the next ON time is generated after a minimum TOFF interval. Figure 70. T_on time with MULTI_PULSE_STRAT = 0x01 MIN TOFF DVCO Pulse PWM Behavior during TON generation Additional DVCO pulses immediately reset TON generation Behavior during TOFF generation New TON generated after minimum TOFF MULTI_PULSE_STRAT= 0x02 Pulse merger skips DCO pulses received during the nominal ON time itself. If a DCO pulse is received during the minimum TOFF window the next ON time is generated after a minimum TOFF interval. STPM098C Functional description DS14440 - Rev 1 page 84/110 |
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