Tool/software:
Below is the overall on how the components are connected.
Please ignore the similarity in the net names because they are not part of the same project files. However, they are connected physically via cables.
Refer to the sketch and I will explain by referring to circuit (A) and (B).
Here is how the components are connected:
After conversion from AC-DC, the output of circuit (A) 15V is connected to the relay common pin in circuit (B).
The relay NO pin of the 15V does not connected to any load (technically, it's open).
Here is the sketch of how the 15V goes to relay common pin:
(A) TPS22811:
(B) Here is the relay circuit:
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The issue:
J13 in circuit (B) is connected to a rocker switch which is used to power up the 12V relay.
When the rocker switch is off, the reading on the output of TPS22811 in circuit (A) is 14.94V.
When the rocker switch is turned on, the output of TPS22811 in circuit (A) starts to decrease from 14.94V to a value close 0V.
What can be the cause of decreasing voltage when there is no load connected to the TPS22811?
