Hi.
I have a buck converter design with LMR36520FADDAR.
The designed input voltage is between 17V to 65V.
The designed output voltage is 5.15V, 10 Watt.
The problem is, that there are a voltage spikes at the output with a frequency of 4.5Khz approximately and with a Peak to Peak values of 40 milli volt. (my tested load is constant about 500 milli ampere).
I have also checked the Output voltage of the switch (pin 8 at the chip), and it looks normal, nice and clean with a switching frequency of 400Khz.
I don't have any idea where this switching noise is coming from.
I attach the schematic design, a scope measurement of the output ripple voltage, and a scope measurement of the switch output (pin 8 of the chip).
Thanks.
