Part Number: TPS82130
For a customer of us we are designing a new PCB where we need to generate +5V DC out of +12V for supply of max 6x USB2.0, 2x touch panel (LCD) and for internal logic
For USB we need max 3A en for 2 displays max 1.9A and for the remaining logic at least 2.5A
Therefore I was thinking of using your TPS82130 converter with integrated inductor. However Webench simulation shows a body temperature of max 105 degrees Celsius at max load which is too much for us (we have no forced cooling).
So I have some options:
- Limiting the max current for the TPS82130 converters to 1.5A . This reduces the body temperature to 59 degrees max which looks acceptable. This means that I need more TPS82130 devices.
- Using TPS62130 with external inductor. Webench shows a temperature of max 69 degrees at 3A load. Still quite high but I think acceptable because the 3A is a worst case situation ( I think that a customer in practive will not use 6 USB ports at max +5Vusb load).
What would you suggest here? The TPS62130 is cheaper but I need an external inductor so the total needed PCB space will be more but possibly I need less converters because the heat is spread between the converter and the inductor. In your datasheet a COILCRAFT XFL4020-222MEB is suggested. I found a much cheaper 2.2uH inductor with similar specs at Murata but it has a bigger size . Is it possible to use this one or do you suggest the inductor as mentioned in your datasheet?
Chris van der Aar
Sr Hardware Engineer
NTS Systems Development
Eindhoven The Netherlands.
In reply to Chris Glaser:
In reply to Chris van der Aar:
Ok thanks. I think I willl go for the TPS62133. Webench shows a max body temperature around 70 degrees at 3A load but this load is worst case in our application so in practice it will be lower.
I found a shielded inductor with a rather small size (max 6.3x6.3mm) and low cost and can handle max 7.8A and 19mOhm max so I think this one is suitable for this application. For the capacitors I will select the TDK types (X7R) as suggested in your application (and Webench).
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