modification on TLV62065 EVM according to customer's requirements:
item | original value | current value |
C4 | 22uF | 4.7uF |
C1 | 10uF | 1uF |
L | 1.2uH | 1uH |
select PFM mode
set load=1A, observe the output voltage ripple as the below picture shows.
It can be observed that besides 3MHz switching ripple, an obvious 100kHz low frequency ripple occurs. BNC connector is already used.
My question is where does the 100kHz ripple come from? and why it occurs? Thanks