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SOLVED: My first TPS61175 Design... no gain...
NivagSwerdna:
And it does seem to try for at least one attempt before giving up...
CH1 Input voltage 5V.... CH2 output side of D1
NivagSwerdna:
Finally during the one blip I captured what was going on at SW...
SiliconWizard:
Just a thought after seeing your captures and reading the datasheet more carefully (see 7.4.1): have you tried your circuit without any output load? What you see may be due to the TPS61175 entering the "pulse skipping" mode (looks like it from the last capture) due to the extremely light load if you haven't added any additional load (basically just the feedback network + output capacitor). You could try adding a small resistive load to the output and see what happens.
NivagSwerdna:
--- Quote from: SiliconWizard on June 10, 2019, 09:09:01 pm ---You could try adding a small resistive load to the output and see what happens.
--- End quote ---
I have a 300 Ohm resistor across the output. It's meant to get to 35V... so it should really be trying harder. The Output is currently a 4.7uF electrolyic and a 10uF electrolytic and to be honest the PCB layout is not optimal for the output caps (although the other layout is IMHO not too shabby).
I'm hoping adding a strategically placed 4.7uF ceramic will change the game... should arrive tomorrow.
thinkfat:
How did you build your prototype, on a perfboard, or a breadboard, or pcb? The layout guidelines are pretty detailed. For a reason, I would think.
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