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L9945 データシート(PDF) 33 Page - STMicroelectronics |
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L9945 データシート(HTML) 33 Page - STMicroelectronics |
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33 / 144 page  Figure 17. Current limitation timing diagram GAPG0102161535CFT tBLANK_HB toff ILIM_th (CH3/7) OC_th (CH4/8) tBLANK_HB t tOC NON1/5 (NPWM) OC Failure toff HBx_ILIM Internal NPWM tBLANK_HB 0A 0s toc Ch4/8 toc Ch3/7 CH4/8 CH3/7 Running Timers toc toff tBLANK_HB Current through Load and Rshunt Current through Load only Current through Rshunt only If the current stays above the programmed threshold (ILIM_th) longer than tOC, the H-bridge is driven into freewheeling phase (active freewheeling or not, depending on HBx_AFW bit) for a programmable OFF time (tOFF). During tOFF, high-side outputs are actively OFF but low-side outputs remain controlled according to DIR and HBx_AFW values, performing a freewheeling action on the low-side. Once tOFF expires, load current is compared against ILIM_th threshold: • In case load current is below ILIM_th, normal operation can continue (refer to Figure 17). • In case current is not below ILIM_th, the high-side channel is turned on for a tFIL_ON + tOC period and then turned off for another tOFF time. Such operation continues until either the current decreases below ILIM_th or the current reaches the overcurrent threshold and H-Bridge is three-stated (all FETs actively OFF, load floating) (refer to Figure 18). Note: since current limitation makes use of shunt sensing, the blanking time programmed for CH3/CH7 has no effect in detection timings. The blanking time has only effect on FETs using DSM. L9945 Functional description DS12275 - Rev 10 page 33/144 |
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