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Original question:

Including external bulk capacitor to an LDO

External super cap for switching regulator

Ujwal Vijaykumar
Prodigy 140 points
Other Parts Discussed in Thread: TPS62147

The capacitor is connected in the following fashion:

The value of C1 is 100mF and is rated at 5V (A super-capacitor) with an ESR of 1.25 ohms @ 1kHz. Kindly help us understand how this capacitor will affect the stability of the Switching regulator and what design changes have to be incorporated to stabilize the switching regulator.

  • 0
    TI__Expert 3645 points
    Hello,
    the use of the supercap does not give problems. You can read the following documents to see the effects of feedforward capacitor to improve the stability and how to measure the control loop.
    www.ti.com/lit/an/slva466a/slva466a.pdf
    www.ti.com/lit/an/slva465a/slva465a.pdf
    If is possible for you, I would also recommend the use of the newer TPS62147/8.