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| Boost converter voltage drop |
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| EEEnthusiast:
How bad is the voltage drop? can you share the layout layers. Some of the TI DCDC converters are very sensitive to layout. |
| fedimakni:
the layout is good, it's almost identical to the recommended layout in the datasheet The voltage drop to 0.75V |
| EEEnthusiast:
The output traces seem way too thin and can drop a bit, but not to 0.75V. Did you probe at the cap at the output of the DCDC? Looks like the DCDC is not able to get into PWM mode. Can you check the waveform at the inductor to check if it is in PWM mode with high current. compare with the datasheet curves. Can you force PWM operation? |
| EEEnthusiast:
can you make the MODE pin high and check? |
| fedimakni:
the traces are 10mil i think they are enough for 200mA. you mean checking the waveform between both pin of the inductor? or one pin and the other oscilloscope probe pin to the ground? For the TPS61291 there's no mention of pwm :/ |
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