SNVSBY7 March 2021 TPS92390
There are a few things to consider when choosing an inductor: inductance, current rating, and DC resistance (DCR). Table 8-2 shows recommended inductor values for each operating frequency. The TPS92390 device automatically sets internal boost compensation controls depending on the selected switching frequency.
|SW FREQUENCY (kHz)||INDUCTANCE (µH)|
The current rating of inductor must be at least 25% higher than maximum boost switching current ISW(max), which can be calculated with Equation 21. TI recommends to use an inductor with low DCR to achieve good efficiency. Efficiency varies with load condition, switching frequency, and components. 80% can be used as a typical estimation. 65% efficiency needs to take into account in extreme condition.