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Part Number: TPS61088
I purchased a TPS61088EVM-677 board, tested it by playing around with different output voltages, and finally agreed to use 4.5V3A output for my heating project design.
I went on to design the schematics referring to the EVM schematics and artwork, programmed for 4.5V3A output, However my board design can only provide 2.5A which is not
enough for my load to heat up to our desired temperature. The EVM worked well with about 4.5V3.3A. (I am pretty new to power designs)
Below is part of my schematics and artwork capture.
Please check my below feedback:
1. change R18 to 15k.
Please refer to the TPS61088 EVM layout(check below picture, AGND and the pGND should be seperated): pour enough GND copper plane below the IC.
Boost DC/DC Solution
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In reply to Helen chen:
Thank you for the reply, I forgot to mention that I have tried changing R18 to 17K and15K already.
Yes I think have had enough pour, however I wasn't able to separate AGND & PGND due to some board design limitations I had at the moment.
Please, I want you to confirm that not separating AGND from PGND is the main problem here before I go ahead with printing a new PCB.
In reply to Xhaseem Muwakanya:
It is very simple to seperate the AGND and the PGND, you can just refer to the TPS61088 EVM board placement below. Put the Cout as close to the output pin as possible. Then pour the AGND and the PGND in the same way.
Yes I have fixed the artwork, bringing the output capacitors as close as possible and separating AGND from PGND.
I will revert after testing the new board.
I have finally tested my 4.5V5A board. I used a recommended schematics from webench power designer for 4.5V5A Output.
Apparently I can only get 2.4A to 2.6A.
Please have a look at my schematics and artwork!
I forgot to say that my load (heating element) is 1ohm. It is kind of a sealer.
please use R18=10k，C=4.7nF for a double check，thanks.
Yes I tried 10k and maximum I can get is 2.5A
Do you mean Capacitor C19?
Yes, I mean C19=4.7nF
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