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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.
TPS62147 – New 17Vin, 2A buck with forced-PWM option for low output ripple. 1% accuracy over temperature, 0.8V to 12Vout, pin-compatible to 4A (TPS62136), for industrial applications.
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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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