This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPS54427: Differing inductor and output cap values vs. compensation

Part Number: TPS54427

We wish to change the inductor and output capacitance values, which takes us off of the recommended values in Table 2 on page 12 of the datasheet.  There is not much guidance on the limits of doing this, since the paragraph above the table refers to a high-frequency zero which is not quantified. We need to know if our specific values are going to result in a stable system.  Here are the details.

Input: 12 V

Output: 5 V (USB charging)

Output capacitance: 150 uF electrolytic (USB requirement) plus 2x 47 uF ceramic plus 1 uF and 10 nF ceramics

Inductor:  5.6 uH (chosen to reduce the ripple current amplitude)

The double pole created by this combination is at 4.3 kHz, as opposed to the target from Table 2 of over 10 kHz.