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Part Number: TLV61048
Schematic in attachment, when we have 30-45mA load the voltage drops to +-12,4/12,5V. How to fix this?
Thomas Van Aken
It is now an avg of 13V (added 1uF from cathode to gnd) but our display is still flickering. Will measure ripple voltage tommorow and update this case.
Looks to be unstable.
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In reply to Thomas Van Aken:
Where did you measure the Vout?
I wonder the converter enters into power save mode with such load. Please catch the waveform at Vin, Vout, SW to check it.
In reply to Minqiu Xie:
As long time no hear from you, I assume you have solved the issue. If not, just reply below. Thank you!
It is super busy here, will try to send you this tonight.
Vin gets dirty from the chip. But see Vin, Vout, Vsw!
May you use a resistance for loading to help debug? I'm not sure if it's caused by load transient.
According to the waveform of Vin and Vsw, it seems the Vin drops obviously. May you check the valley value of Vin? The UVLO of TLV61048 is 2.4V.
Vin drops to 2.4V (but this is caused by the boost conv.), will now do a cont. load test instead of the oled.
Problem stays with cont. load of 20mA. See attachment! (other scope since we have alot of other set-ups).
Any idea what happens? Since we need to fix this asap ...
Sorry, it seems the reply is missing.
What's your power supply? I wonder why it drops so much? Do you have current probe to catch the current waveform of inductance?
Additionally, please also remove the load to check if it can startup without load.
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