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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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L6235Q датащи(PDF) 13 Page - STMicroelectronics |
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L6235Q датащи(HTML) 13 Page - STMicroelectronics |
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13 / 33 page  L6235Q Circuit description Doc ID 018997 Rev 2 13/33 Figure 12 shows the lower limit for the ON time tON for having a good PWM current regulation capacity. It should be mentioned 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. Therefore, a small COFF value gives more flexibility to the applications (allows smaller ON time and, therefore, higher switching frequency), but, the smaller the value for COFF, the more influential the noises on the circuit performance. Figure 11. tOFF vs. COFF and ROFF t ON t ON MIN () > t ON t RCRISE t DT – > ⎩ ⎪ ⎨ ⎪ ⎧ 1.5 μstyp () = t RCRISE 600 C OFF ⋅ = 0.1 1 10 100 1 10 100 1 .10 3 1 .10 4 Coff [nF] Roff = 100kΩ Roff = 47kΩ Roff = 20kΩ |
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