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TPS78001 / Fluctuate the input source.

Sho Ogane
Genius 5575 points
Other Parts Discussed in Thread: TPS709, TPS732, TPS734, TPS737

Hi all.

Please see the circuit using TPS78001.
The input source of this circuit is the PV, and it fluctuates between 0V~5V.
Can I use the TPS78001 in this case?

If I can't use the TPS78001 in this case, please tell me the proposed measures.

Best Regard,
Sho Ogane

  • 0
    TI__Expert 8905 points
    Hi Sho,

    This circuit should work with the diode in place. We also have several parts with built-in reverse current protection. For charging a supercapacitor I would advise the TPS737 which comes in a 2x2 package and can source up to 1A. Other options include the TPS732, TPS734, and the TPS709.

    One other note - we do not typically test having a super capacitor on the output of the LDO - I would advise putting a resistor in series with the supercap to limit the in-rush so it is below the rated current limit of the LDO. The supercapacitor should also be isolated from the control loop of the LDO, so place the super capacitor and resistor after the feedback network. To help further isolate the LDO's control loop you should also have a local X5R or X7R output capacitor before the feedback network that meets the requirements in the datasheet for stability.

    Regards,
    David