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AN2785 Datasheet(PDF) 42 Page - STMicroelectronics |
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AN2785 Datasheet(HTML) 42 Page - STMicroelectronics |
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42 / 51 page  Below-ground voltage on the OUT pin AN2785 42/51 Doc ID 14785 Rev 1 Figure 31. Bootstrap overcharging due to below-ground voltage on OUT pin Note that in the L6393 IC gate driver the internal DMOS in series with the integrated bootstrap diode is only fully turned on when the LVG is ON. In fact, when the LVG is OFF, the gate of the bootstrap DMOS is biased at VCC voltage. This means that if the VBOOT is pulled down by the bootstrap capacitor (due to a below-ground voltage on the OUT pin) at about 3 V (typical value) below the VCC voltage, the DMOS turns on again. Figure 32 shows some different (internal and external) bootstrap network characteristics. BOOTSTRAP NETWORK & BELOW GROUND VOLTAGE BOOT OUT t VOUT VCC 0V VBOOT VBOOT - VOUT VCC VBOOT - VOUT during BGV spike VBOOT - VOUT overcharged during static BGV VBGV_static VBGV_spike Tspike < 100ns typically Time constant of this transition: RBOOT * CBOOT >> Tspike typically DBOOT RBOOT VBOOT - VOUT befor overcharge VOUT |
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