2021-04-06 12:54 AM
2021-04-06 02:35 AM
Hello @MBeda.1 and welcome to the ST Community.
We recommend the configuration with bootstrap capacitor (CBOOT) connected between VBOOT and Vs.
If it is connected to GND and Vs quickly drops, for example when a poorly load regulated supply sees a step change in current, the energy in CBOOT would go into the chip and possibly damage it.
On the other hand if CBOOT is connected to Vs and Vs drops, the entire charge pump circuitry drops so there would be no possibility of CBOOT energy going into the chip.
Another problem could be the noise on the GND, for example due to a bad layout, could cause an over-rating condition on bootstrap pin followed by the damaging of charge pump circuitry and device.
Please click on the "Select as Best" button if my reply fully answered your question.
2021-04-06 02:35 AM
Hello @MBeda.1 and welcome to the ST Community.
We recommend the configuration with bootstrap capacitor (CBOOT) connected between VBOOT and Vs.
If it is connected to GND and Vs quickly drops, for example when a poorly load regulated supply sees a step change in current, the energy in CBOOT would go into the chip and possibly damage it.
On the other hand if CBOOT is connected to Vs and Vs drops, the entire charge pump circuitry drops so there would be no possibility of CBOOT energy going into the chip.
Another problem could be the noise on the GND, for example due to a bad layout, could cause an over-rating condition on bootstrap pin followed by the damaging of charge pump circuitry and device.
Please click on the "Select as Best" button if my reply fully answered your question.