2021-05-24 09:49 PM
I have an EVSPIN32F02Q1S1 board to experiment. Each boot pin has a connection to Vcc via a diode (D1, D4, D7) - which are not mounted on the board. When driving a phase full on the pull up MOSFET breaks down about every 2.5ms. The time varies depending on other IO signals.
I can not find a reference data sheet or application note about the MOSFET driver circuitry of this chip.
Anybody knows how to drive this pin?
If I need 100% Vcc output, is populating those diodes all that is required?
What are the implications?
Solved! Go to Solution.
2021-05-25 01:20 AM
The driver works like all known half-bridge drivers based on bootstrap capacitors and is comparable to the STDRIVE101, but can work with a higher bridge voltage. The evaluation board offers the option of connecting external bootstrap diodes to reduce the time to charge the bootstrap capacitors.
100% VCC output is only possible for the (limited) time that the bootstrap capacitors supply the high-side FET and remain above the UVLO limit.
Regards
/Peter
2021-05-25 01:20 AM
The driver works like all known half-bridge drivers based on bootstrap capacitors and is comparable to the STDRIVE101, but can work with a higher bridge voltage. The evaluation board offers the option of connecting external bootstrap diodes to reduce the time to charge the bootstrap capacitors.
100% VCC output is only possible for the (limited) time that the bootstrap capacitors supply the high-side FET and remain above the UVLO limit.
Regards
/Peter
2021-05-25 09:27 PM
Thanks Peter, the datasheet for the STDRIVE101 has all the answers. Might be worth adding a reference to the STSPIN32F0251 datasheet.
Markus