Tool/software:
Currently, I have implemented a design based on the PMP22557 (buck converter) using identical component values, achieving an output current of up to 0.4A (DC_RMS). However, my target output current is 2.08A (DC_RMS).
Upon reviewing the datasheet regarding the design calculations, I noticed that the IOCC parameter refers to the peak inductor current. According to my calculations, this peak current could reach as high as 5.79A in my design.
Initially, to avoid triggering VCSTMIN at an output current of 0.4A, I used a 2x margin calculation of 0.249/(2×0.4)0.249/(2 x 0.4)0.249/(2×0.4), resulting in a resistance of 0.33Ω.
For my actual design requirement, I'd like to clarify whether the correct resistor calculation would be 0.249/(2×5.79)0.249/(2 x 5.79)0.249/(2×5.79) or 0.249/(2×2.08)0.249/(2x2.08)0.249/(2×2.08). Could you please provide your expert advice on this?
Additionally, when I attempted to short resistor R6 due to the unavailability of an appropriate resistor value in our laboratory, the IC failed to operate altogether. Could you kindly advise me on how to calculate the minimum resistor value required for proper operation of this IC?
Thank you in advance for your guidance.
