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AN2738 Datasheet(PDF) 44 Page - STMicroelectronics |
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AN2738 Datasheet(HTML) 44 Page - STMicroelectronics |
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44 / 54 page  The below-ground voltage on the OUT pin AN2738 44/54 Doc ID 14589 Rev 2 Figure 39. Bootstrap over-charging due to below-ground voltage on OUT pin Note that in the L6390 IC gate driver the internal DMOS in series with the integrated bootstrap diode is fully turned on only when 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 below-ground voltage on OUT pin) at about 3 V (typ) below VCC voltage, the DMOS turns on again. Figure 40 shows some characteristics of different (internal and external) bootstrap networks. 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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