Hi,
I would like to use ADP2389.
So, I used "ADP2389/90 BuckDesigner Tool.
However, a problem occurred.
When setting under the following conditions, the values of inductor and capacitor differed between my calculation and tool.
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Setting Conditions
Vin = 5.0 V
Vout = 1.0 V
Iout = 9.0 A
Vout ripple = 0.015 V
Fsw = 400 kHz
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So, I have some questions.
#1 About Inductor.
When I calculate under the above conditions, the inductor value becomes 0.75 uH, but in the tool it is 0.4 uH. What is the reason for this difference?
#2 About Capacitor.
In the tool, the output capacitor value was 220 uF.
When I calculate based on output ripple voltage condition and load transient response,
It became Cout ripple = 56 uF, Cout ov = 82 uF, Cout uv = 9.1uF.
Therefore, I think that it is good to satisfy 82 uF for the value of the output capacitor,
Why is 220 uF?
Best Regards,
Yuya