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Os motores de busca de Datasheet de Componentes eletrônicos |
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Os motores de busca de Datasheet de Componentes eletrônicos |
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POWERSTEP01 Folha de dados(PDF) 45 Page - STMicroelectronics |
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POWERSTEP01 Folha de dados(HTML) 45 Page - STMicroelectronics |
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45 / 92 page  DocID025022 Rev 5 45/92 powerSTEP01 Phase current control: current mode 92 Figure 21. Adaptive decay - fast decay tuning When two or more fast decays are performed with the present target current, the control system adds a fast decay at the end of every off-time keeping the OFF state duration constant (tOFF is split into tOFF, SLOW and tOFF, FAST). When the current threshold is increased by a microstep change (rising step), the system returns to normal decay mode (slow decay only) and the tFAST value is halved. Stopping the motor or reaching the current sinewave zero crossing causes the current control system to return to the reset state. reference current 1st fast decay: Tfast = TOFF_FAST/8 2nd fast decay (*): Tfast = TOFF_FAST/4 (*)Note: starting from 2nd fast decay the system combines fast and slow decay during the OFF phase. 3rd fast decay: Tfast = TOFF_FAST/2 Ton > TON_MIN Tfast = TOFF_FAST/2 AM15050v1 |
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