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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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L99DZ80EP датащи(PDF) 37 Page - STMicroelectronics |
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L99DZ80EP датащи(HTML) 37 Page - STMicroelectronics |
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37 / 68 page  DocID18260 Rev 6 37/68 L99DZ80EP Application information 67 3.16 H-bridge driver slew-rate control The rising and falling slope of the drivers for the external high-side Power-MOS can be slew rate controlled. If this mode is enabled the gate of the external high-side Power-MOS is driven by a current source instead of a low-impedance output driver switch as long as the drain-source voltage over this Power-MOS is below the switch threshold. The current is programmed using the bits SLEW<4:0>, which represent a binary number. This number is multiplied by the minimum current step. This minimum current step is the maximum source- /sink-current (IGHxrmax / IGHxfmax) divided by 31. Programming SLEW<4:0> to 0 disables the slew rate control and the output is driven by the low-impedance output driver switch. 10 1 1 1 X X 0 0 0 0 0 H L L H Bridge H1/L2 on 11 X 0 110 0 0 0 0 0 H L H L Slow-decay mode HS1 and HS2 on 12 0 0 1 1 1 0 0 0 0 0 L L H L Slow-decay mode HS2 on 13 1 0 1 1 1 0 0 0 0 0 H L L L Slow-decay mode HS1 on 1. Only the half-bridge (low and high-side), in which one MOSFET is in short circuit condition is switched off. Both MOSFETs of the other half-bridge remain active and driven by DIR and PWMH Table 25. H-bridge control truth table (continued) N° Control pins Control bits Failure bits Output pin Comment DIR PWMH HEN SD SDS CP_LOW OV UV DS TSD GH1 GL1 GH2 GL2 |
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