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L6227PD Datasheet(PDF) 10 Page - STMicroelectronics |
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L6227PD Datasheet(HTML) 10 Page - STMicroelectronics |
10 / 22 page L6227 10/22 Figure 8. Output Current Regulation Waveforms Figure 9 shows the magnitude of the Off Time tOFF versus COFF and ROFF values. It can be approximately cal- culated 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: 20K Ω ≤ ROFF ≤ 100KΩ 0.47nF ≤ COFF ≤ 100nF tDT = 1µs (typical value) Therefore: tOFF(MIN) = 6.6µs tOFF(MAX) = 6ms 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 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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