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L9945 Datasheet(PDF) 35 Page - STMicroelectronics |
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L9945 Datasheet(HTML) 35 Page - STMicroelectronics |
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35 / 151 page  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. Figure 18. Current limitation iterations (until OC failure) 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 CH3/7 CH4/8 tOC freewheeling OC Failure Running Timers toc toff tBLANK_HB Current through Load and Rshunt Current through Load only Current through Rshunt only GAPG0102161522CFT When current limitation threshold is reached for the first time, a dedicated HBx_ILIM latch is set, indicating that current limitation function has been activated. This latch is cleared on SPI readout. The OFF time interval for current limitation (tOFF) is selectable via SPI according to HBx_toff bit: L9945 H-Bridge DS12275 - Rev 8 page 35/151 |
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