Good morning. Good morning. To create a hold-up circuit for a load that accepts a power supply voltage from 18 to 32V, load at 60V a capacitor of 12mF and activating the EN/UVLO pin, I would like to use the lt8210 working as a buck until the capacitor voltage is reduced to 32V, take advantage of pass-thru operation up to 20V and then extract as much energy as possible from the energy stored in the capacitor by making the LT8210 work as a boost. I do not foresee current limitations, but given the current mode operation of the controller I have inserted 3 mOhm sensing resistors, with inductance of 4uH@10A & 5mOhm. Referring to the diagram of fig.16 of the data-sheet I connected 480k between Vout and FB1, 10k between FB1 and FB2, 10k between FB2 and Gnd. I also inserted 27k between Vc1 and Vc2. It escapes me, I did not understand, if the LT8210 manages the three modes of operation independently or if I have to insert a control circuit that acting on M1 & M2 imposes the required modes of operation, to obtine the function to maintaining the output voltage within 32->18V during the complete discharge of the capacitor.
Wthout it wasting time i cananticipate the problems of the LT8210, given the sad experience with other LT products.
Thank you for your attention
The product expert responded to you by email. Here is summary of the recommendation:
AWolfsgruber_LT8210 Design Spreadsheet.zip
Attached for Fil