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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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L6228PD датащи(PDF) 13 Page - STMicroelectronics |
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L6228PD датащи(HTML) 13 Page - STMicroelectronics |
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13 / 26 page  13/26 L6228 tRCRISE = 600 · COFF Figure 13 shows the lower limit for the on time tON for having a good PWM current regulation capacity. It has to be said that tON is always bigger than tON(MIN) because the device imposes this condition, but it can be smaller than tRCRISE - tDT. In this last case the device continues to work but the off time tOFF is not more constant. So, small COFF value gives more flexibility for the applications (allows smaller on time and, therefore, higher switching frequency), but, the smaller is the value for COFF, the more influential will be the noises on the circuit performance. Figure 12. tOFF versus COFF and ROFF Figure 13. Area where tON can vary maintaining the PWM regulation. t ON t ON MIN () >2.5 µs (typ. value) = t ON t RCRISE t DT – > 0.1 1 10 100 1 10 100 1 .10 3 1 .10 4 Coff [nF] Roff = 100kΩ Roff = 47kΩ Roff = 20kΩ 0.1 1 10 100 1 10 100 Coff [nF] 2.5 µs (typ. value) |
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