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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AN2785 датащи(PDF) 46 Page - STMicroelectronics |
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AN2785 датащи(HTML) 46 Page - STMicroelectronics |
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46 / 51 page  Below-ground voltage on the OUT pin AN2785 46/51 Doc ID 14785 Rev 1 Figure 35. OUT below-ground voltage in transient conditions: limited boot overcharging 9.4.3 Below-ground voltage spikes As explained in the previous section, the dynamic contribution of the below-ground voltage on the OUT pin does not have enough time to overcharge the bootstrap capacitor. This fact usually excludes the risk of exceeding the recommended maximum value of 20 V for the VBOOT -VOUT voltage, but on the other hand it increases the danger of pulling the BOOT pin down below ground, then violating its absolute minimum rating. As mentioned above, for safe operation of the IC gate driver, this phenomenon should be avoided. However, note that applicative bench tests have shown that the L6393 also works with below-ground spikes on the OUT pin that well exceed -50 V (see Figure 36). t VOUT VCC 0V VBOOT VBOOT - VOUT VBO OT - VOUT v irtual final v alue in s t eady st ate VBGV_stati c VBGV_spike VBOOT - VOUT bef or ov erc harge VOUT VBOOT - VOUT s afe operating max imum range (20V ) VBOOT - VOUT real overc harge High side O FF time HIN HVG |
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