Dear Sir/Madam,
I have a tps62130 circuit that has oscillations on the switching node (SW). See scope shot below.
Circuit and layout as per datasheet.
Cin is 2x47uF, 1x22uF and 1x10uF.
Cout is 2x22uF.
Vin is +12V
Vout is +3V6.
R1 is 634K, R2 is 180K
L is XFL4020-222MEC
+12V connects to 78R/5A ferrite before connecting to Cin.
Has anyone seen this issue before or know where to start looking.
I suspect interaction between input and output filter.
Regards Grant
