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TPS61094: Supplement State Circuit

Hendrickx Olivier
Prodigy 65 points
Part Number: TPS61094


Hello,

Can you tell me if there is another circuit, or another method to achieve the function shown in figure 7-4 of the datasheet (Supplement State Circuit) but with an input voltage of 11V to 17V.

In short, my problem to solve is that I use a module that I cannot touch (you have to see it as a black box). When this module start causes a current peak that my power supply is not able to provide. I can't change my power supply either. So I thought I was looking to solve this problem by "intercalate" a circuitry managing the charging and discharging of a supercap that could give a boost during start-up? (What the TPS61094 does if I understand correctly but not with the good voltage for me...)

For information my nominal input voltage is 15V but can vary between 11V and 17V. The maximum current of this power supply is 2A5. I need an extra 2A5 to be able to absorb this spike. The output voltage does not need to be specially regulated.

If you have another idea I'm a taker too ;-)

Best regards

Olivier

  • 0
    TI__Genius 12985 points

    Hi Oliver,

    Thanks for reaching out. Sorry for that we don't have a device similar to TPS61094 with higher voltage now. We do have a plan but it may need a long time to finish, if you are interested in the new device, we can communicate it by mailing next.

    You said your output voltage does not to be regulated, so what's the range of VOUT? It is same with VIN?

    I think maybe you can use a single Boost as backup circuit (discharge from supercap to load) and charger circuit to charger supercap. You can take this application note as refence although it is designed for low voltage.

    Best Regards,

    Nathan

  • 0
    Prodigy 65 points

    Hello Nathan,

    Thank you for your reply.
    Indeed VOUT can be identical to VIN.

    If I understand you correctly, I can insert the "Supercapacitor Charging" circuit (fig3 , page 6) in parallel on my power supply line, adapting it to my voltage! Thanks for the idea :-)

    Best regards

    Olivier

  • 0 in reply to Hendrickx Olivier
    TI__Genius 12985 points

    Hi Olivier,

    Yes, you can insert the "Supercapacitor Charging" circuit in parallel on my power supply line, but do not forget the charging stop circuit to protect the supercap. So, I think another reference design may be more suitable for your application.

    https://www.ti.com/lit/an/slua943/slua943.pdf

    the full schematic is here:

    https://www.ti.com/lit/pdf/tidrz79

    Best Regards,

    Nathan

  • 0 in reply to Nathan Ding
    Prodigy 65 points

    Hi Nathan,

    Sorry, but I don't understand how I have to reinject the current from the supercap to VIN? In the first example provided I assume this was done via D1?

    Do I do the same thing in the second example?

    In my case I am thinking of putting 5 supercaps in series of 3V to arrive at a voltage of 15V. When do you think ?

    Thank you

    Olivier

  • 0 in reply to Hendrickx Olivier
    TI__Genius 12985 points

    Hi Olivier,

    You can see there is a overcharge protection circuit in the first example.

    You can take the circuit as reference but maybe the parameters need to change.

    If you want to put several supercap in series, you need to consider voltage sharing between different cap, because those caps are not completely same, maybe you need extra circuits to achieve this.

    Best Regards,

    Nathan

  • 0 in reply to Nathan Ding
    Prodigy 65 points

    Hi Nathan,

    Thank you very much for you help. I will make a "test board" so I can do some tests following your advice.

    Best regards

    Olivier