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TIDA-010075: If the same solution can be used for supercapacitor charging

Yazhu Liu
Intellectual 1410 points
Part Number: TIDA-010075

Hi Team,

My customer is searching for a constant voltage and current charging solution with BUCK topology, I promote TIDA-010075 to them, and they have following 2 questions related to the reference design, would you please help to give some comments on that?

1. Can this solution be used in supercapacitor charging application? As the initial voltage level of the supercapacitor is 0V, will this cause any short circuit condition? I suppose not as capacitor should be taken as open circuit for DC voltage?

2. Can the circled resistor to be put at the positive side of the battery/supercapacitor and a FDA can be used instead of a amplifier. One thing I could think about here is the common-mode input voltage range of the FDA should be taken care of.

Thanks.

Best Regards,

Livia

  • 0
    TI__Intellectual 2125 points

    Hi Livia,

    1.Since this design is in CC mode, the charging current is 1A, if the super capacitor can support 1A current output when starting, then the design can be used.

    2.In theory, high-side current sampling is also feasible, but as you said, FDA with high common-mode rejection ratio is required. Why do you want to use high-side current sampling?

    BR

    thanks 

    Jenson

  • 0 in reply to Jenson
    TI__Intellectual 1410 points

    Hi Jenson,

    Customer want to use high-side current sampling mainly because that the supercapacitor is connected to 12V bus, charging/discharging share the same GND, if putting the shunt resistor at the low side, they're afraid that the discharging current will lead to large power loss and thermal challenge. Will this be a potential problem here?

    Best Regards,

    Livia

  • 0 in reply to Yazhu Liu
    TI__Intellectual 2125 points

    Hi Livia,

    Can you provide a block diagram or design schematic diagram of their discharge circuit?

    I would like to know what their charging and discharging circuit is.

    BR

    Jenson