Other Parts Discussed in Thread: TPS61010
I have a question about LM27403.
For details, please see the attached document.
Thank you.
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Ishii-san,
PG abs max is 6V so it should be pulled upto VDD and or a supply not higher than 6V.
Regards,
Mathew
Ishii-san,
I am sorry, did not understand your question. Please illustrate with a figure if possible.
Regards,
Mathew
Hello.
Thank you for your response.
Detailed contents are described in the attached document.
please confirm.
Thank you.
Hello,
PG of LM27403 needs 100uA current for pull down. I would recommend changing the 80K to 15K or lower. Also would be good to verify operation independently without hooking upto EN of TPS61010 and then with it hooked up. the PG pin is an open drain pin.
Regards,
Mathew
Hello
Thank you for your answer.
As I gave you advise, I experimented with a pull - up resistor under 15 KΩ.
The results are attached.
It did not improve.
What is the cause?
Thank you.
Hello,
Did you try a new IC on the board to verify if it was damaged?
Regards,
Mathew
Hello
Thank you for your reply.
Yes.
EVM and our board also have the attached waveform.
Currently, 3 pieces are the same in the same state.
Thank you.
Hello,
Not sure what is happening here. i think the parts may have become damaged when you pulled upto Vin. I will take waveforms here also. Please send the schematic which is being used. The pulls up should not be to a voltage higher than 5V.
Regards,
Mathew