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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AN4158 датащи(PDF) 16 Page - STMicroelectronics |
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AN4158 датащи(HTML) 16 Page - STMicroelectronics |
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16 / 34 page  Peak current control with PWM and constant off-time AN4158 16/34 DocID023635 Rev 2 When the slow decay is not able to decrease the phase current, the fast decay method can be used. The fast decay forces the current reduction applying the supply voltage in reverse direction. This way the current is actively reduced using the same voltage used to force it into the phase during the on-time. In this case the current drop and then the ripple are greater than with slow decay, but the peak current is kept under control (see Equation 7). Equation 7 Figure 10. Back electromotive force limiting the slow decay effectiveness R Ph V BEMF I Ph L Ph Motor phase equivalent circuit V BEMF >> IPh x RPh V BEMF < 0 AM15112v1 I Ph RPh IPh VBUS + L Ph tOFF |
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