Other Parts Discussed in Thread: ISOW7740
Hi expert,
I use ISOW7840 in the system. Below is the SCH.
And I heard some noise from the IC. I measure the ripple of Viso, and find there is a 10K low frequency noise on it.
I try to remove C20 , and then the IC work normally. There is no low frequency noise.
I find the description in the DS, input decoupling capacitor should be larger than output capacitor by at least 100 µF.
But TI remove the description in 2021.
The Date code of the IC I use is 2145. Could I keep input decoupling capacitor should be larger than output capacitor by at least 100 µF?
Now I remove C20, and everything is OK, can I use like this?
Thanks!