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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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L6229Q датащи(PDF) 14 Page - STMicroelectronics |
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L6229Q датащи(HTML) 14 Page - STMicroelectronics |
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14 / 28 page  Circuit description L6229Q 14/28 Doc ID 15209 Rev 3 Figure 10. Output current regulation waveforms Figure 11 shows the magnitude of the Off Time tOFF versus COFF and ROFF values. It can be approximately calculated from the equations: tRCFALL = 0.6 · ROFF · COFF tOFF = tRCFALL + tDT = 0.6 · ROFF · COFF + tDT where ROFF and COFF are the external component values and tDT is the internally generated Dead Time with: 20 k Ω ≤ R OFF ≤ 100 kΩ 0.47 nF ≤ C OFF ≤ 100 nF tDT = 1 µs (typical value) Therefore: tOFF(MIN) = 6.6 µs tOFF(MAX) = 6 ms These values allow a sufficient range of tOFF to implement the drive circuit for most motors. The capacitor value chosen for COFF also affects the Rise Time tRCRISE of the voltage at the pin RCOFF. The rise time tRCRISE will only be an issue if the capacitor is not completely charged before the next time the monostable is triggered. Therefore, the on time tON, which depends by motors and supply parameters, has to be bigger than tRCRISE for allowing a good current regulation by the PWM stage. Furthermore, the on time tON can not be smaller than the minimum on time tON(MIN). OFF BC DD A tON tOFF BC ON 2.5V 0 Slow Decay Slow Decay 1 μs tBLANK tRCRISE tRCRISE SYNCHRONOUS RECTIFICATION 1 μs tBLANK 5V VRC VSENSE VREF IOUT VREF RSENSE D02IN1351 tOFF 1 μs tDT 1 μs tDT tRCFALL tRCFALL |
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