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L9945 数据表(PDF) 34 Page - STMicroelectronics |
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L9945 数据表(HTML) 34 Page - STMicroelectronics |
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34 / 144 page  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: Table 22. tOFF selection HBx_toff [1-0] Min tOFF value Typical tOFF value Max tOFF value Unit 00 28 31 34 µs 01 42 48 52 µs 10 56 62.5 70 µs L9945 Functional description DS12275 - Rev 10 page 34/144 |
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