SLUAAT9 January 2024 LM5101A , UCC27201A , UCC27201A-Q1 , UCC27211A , UCC27282 , UCC27282-Q1 , UCC27284 , UCC27284-Q1 , UCC27301A-Q1 , UCC27311A-Q1
There are considerations in the design to help reduce the stress on the boot diode and ways to mitigate possible damage to the boot diode in the bidirectional DC-DC applications.
Firstly, proper sizing of the bootstrap capacitor is important to properly driving the power MOSFETs and also resulting in the fastest start-up of the HB-HS bias. We do not recommend oversizing the bootstrap capacitor in these applications.
There are additional design considerations that can address the gate driver and bootstrap start-up as follows: