Other Parts Discussed in Thread: UCD3138, PMP23421
Tool/software:
Dear TI Support Team,
I’m currently evaluating the PMP21529 reference design as a base architecture for a 5 kW bidirectional buck-boost converter
I have several technical questions and would appreciate your insights:
-
The current PMP21529 reference operates at relatively low power (~76 W). For a 5 kW system delivering up to 100 A at 48 V, are there any TI guidelines or best practices for scaling the power stage (FETs, inductors, capacitors)?
Specifically:-
How would you approach paralleling FETs for thermal/current balance?
-
What considerations should we keep in mind for selecting an inductor rated for 100+ A continuous current?
-
Are there design references for output capacitor selection to handle large ripple at this power level?
-
-
Does the firmware example provided with PMP21529 include bidirectional mode handling (buck and boost)?
We’re planning to implement both charge and discharge logic using the same converter path — does UCD3138 natively support this mode-switching? Can it be used for CC/CV charging profiles, and are any example implementations available? -
Is the PMP21529 design or firmware configurable to communicate over PMBus or UART? We need telemetry for voltage/current monitoring and mode switching from an external MCU.
Also, are the overvoltage/undervoltage/fault handling functions programmable via firmware?
If there are any other reference designs, documents, or higher-power UCD3138-based solutions better suited for this type of system, I’d appreciate your recommendation.
Thank you for your time and support.
Best regards,
