Other Parts Discussed in Thread: BQ25758
Hello. Few questions here. But to preface, I am building a power station that includes a 3kWh 3S li-ion NMC battery pack. It attaches to a 1200W inverter through a 140A BMS. I plan to use BQ25756RRVR as my charge controller. Here are my specs based on the design calculator: https://docs.google.com/spreadsheets/d/1KBzovb3byR3zg0GWcImYAe9ixxSR5f-z/edit?usp=sharing&ouid=110099539842919090089&rtpof=true&sd=true
I want BQ25756 to have both a solar input and a USB-C input. It should be able to handle a solar input up to 70V, 20A and a 240W USB-C input. For USB-C 240W, I plan to use the HUSB238A sink controller from Hynetek.
It seem unfortunately, MPPT charging cannot be programmed via hardware.
Questions:
1. Can BQ25756 be used for BOTH USB-C and Solar? Or can I choose only one option?
2. I notice the datasheet recommends a minimum inductor DCR of 5mΩ. The only inductor I can spec out for the 70V, 20A, limit I prefer has a DCR of 0.72mΩ. WIll this be a fatal issue?
3. HUSB238A is limited availability for now. Though I have 5 sample ICs, when will TI release USB-C PD EPR chips that can handle the full 240W power range?
4. Will SiR882ADP be suitable for my application? Or should I parallel my FETs?
