I'm trying to debug a incorrect output voltage from a boost regulator (TPS61220). The schematic is below. Pointed colors represent the measuring points in graphs underneath:
According to the datasheet, the ratio of R1 and R2 should result in an output voltage of cca. 2.8V. However the output (green) is never higher than the input and is rather unstable. The current coming from the source is a constant 15mA even though there is nothing connected to the output.
The prototype board was assembled on a breadboard.
The power source is expected to be unstable, vary in voltage between 0.8-2.5.
- How would one approach debugging this circuit?
- Should the current be observed on the induct and it makes no sense to check the voltage (green)?
- Would 15mA of current without a consumer imply an assembly problem?