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L99DZ320 データシート(PDF) 68 Page - STMicroelectronics |
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L99DZ320 データシート(HTML) 68 Page - STMicroelectronics |
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68 / 146 page  Figure 29. Half bridges in PWM mode: filter time is tFOC_PWM 3.19 Short-circuit current detection To distinguish low resistive short-circuit events from overcurrent conditions (especially in overcurrent recovery mode), a short-circuit current threshold is implemented for all the half bridges (HB4 to HB6). Short-circuit condition is detected if the output current exceeds the short current threshold (ISCX). In this case, a status flag HBx_HS_SC / HBx_LS_SC is set in the corresponding status register and the output is turned OFF. The corresponding overcurrent flag of the out (HBx_HS_OC / HBx_LS_OC) is also set. The HBx_HS_OC / HBx_LS_OC status flag must be cleared before the output can be turned ON by SPI. A blanking time tBLK is applied at turn on of the output. The filter time applied is tFSC. Figure 30. Half bridge short-circuit detection in latch mode (overcurrent recovery disabled) and OCR mode (overcurrent recovery enabled) In PWM mode, no blanking time tBLK is applied and the short-circuit filter time is reduced to tFSC_PWM. L99DZ320 Functional description DS14235 - Rev 5 page 68/146 |
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