SLUSBP5E March 2014 – July 2018 TPS92601-Q1 , TPS92602-Q1
UNLESS OTHERWISE NOTED, this document contains PRODUCTION DATA.
The peak-to-peak ripple is limited to 30% of the maximum output current.
Estimate the minimum inductor size using Equation 52
Select the nearest higher standard inductor value of 22 µH. Estimate the ripple current using Equation 53.
The worst-case peak-to-peak ripple current occurs at 46.1% duty cycle and is estimated as 0.559 A. Equation 55 estimates the worst-case rms current through the inductor.
The worst-case rms inductor current is 3.28 A rms. Equation 56 estimates the peak inductor current.
Select a 22-µH inductor with a minimum rms current rating of 3.44 A and minimum saturation current rating of 3.44 A. The selection is a Wurth 7447709220 inductor (shielded-drum core, ferrite, 22 µH, 5.3 A, 0.0233 Ω, SMD).
Equation 57 estimates the power dissipation of this inductor
The Wurth 7447709220 inductor with 23.3-mΩ DCR dissipates 251 mW of power.