Tool/software:
I am in the process of designing power regulation with the following requirements:
Input: 3V-7.5V
Output: 5V @5A max (though normally <1A)
User preferred freq: 250kHz
When I input my design requirements into WEBENCH and generate a design for the TPS552882, it suggests an inductor value of 3.3uH with suggested range of 2.7 μH - 4.05 μH.
However in section 8.2.2.8 of the datasheet, it asserts that "The inner current loop uses internal compensation and requires the inductor value must be larger than 1.2/f SW." The suggested inductor value appears to violate this requirement, requiring fSW=~360kHz to fulfill, or changing the inductor value to 4.8uH. Incidentally, I found no other mention of this requirement anywhere else in the datasheet.
If on WEBENCH I set user preferred freq to 400kHz, suggested inductor values fall within the 2.2uH range, violating the 1.2/fSW rule again.
Is this actually a requirement for internal inner current loop compensation? Are WEBENCH calculated values OK to use as is?
