By doing some debugging on an existing product, I found that we don’t meet a parameter for the CSD86350Q5D mosfet.
So we use the TPS51727 with 4 Buck NexFET (see 2nd figure)
Each of GATEH1 and GATEH2 signals drive 2 Buck NexFET’s.
CSD86350Q5D asks for a 4.5V level for Vgs to get in the proper linear region
But the TPS51727 drives only 4.3V.
Is it because I have 2 mosfet connecter on the GATEH signals…?
The signal is flat during the active period. I would expect a slope if it was capacitance issue…
On the evaluation board, there is a provision to install a 5.11 ohm and Zener diode to help VBSTx (see first figure)
If this could improve the swing level, do I need to add the 5.11 ohm resistor
Maybe I can use another mosfet having better Vgs characteristics..
I attached the schematic
3343.tps51727_gate_driver_level_question.pdf