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Tool/software: WEBENCH® Design Tools
Hello My name is Wes and I need help I am a senior design student at the University of North Dakota. We are trying to build a +/- 5VDC supply for our 4 op-amps consuming no more than 150mA min and 500mA max. We also are trying to power up the CC3200 Eval board with 3.3VDC min .500mA to 1 Amp max.
We have tried the TI WEBENCH and we confused because we can't figure it out. It would let us make a 3 output design it would only let us make a 5V & 3.3V design Please someone help us with this issue as we have to hurry and design and get our board in 1 month.
Ok, I guess I can see what you are saying now. Please check back as I will keep communicating on this post.
I did do what you are saying and just create single loads and then how can I send all these to one PCB?
Again shortly later on today I will post all my designs... So you guys can help walk us through this process. Thanks for your time,
Wes
I think design PMP20634 in the TI-Designs catalog will work as long as I can find the parts... thats plenty of power to drive my rails and the TIDA-00534 chip but i guess heat is an issue. Here is a pic of the AC/DC or 120VAC to 12VDC-1Amp 12Watt supply that look simple to re-create.
link below....
Hi Wesley,
I searched WEBENCH for 85V to 265V, 12V @0.1A design and found that UCC28880 or UCC28881 could work for your needs as well. Can you confirm that 0.1A load on 12V Vout would be enough for your needs.
https://webench.ti.com/appinfo/webench/scripts/SDP.cgi?ID=55BCCE6EFD934DDC
Here is a link to the design.
You can also take a look at the EVM for this product. http://www.ti.com/lit/ug/sluub56c/sluub56c.pdf
This should be a much smaller design and it does not need a transformer (hence non-isolated). Do you have an isolation requirement for your product?
If you have an isolation requirement, you could still go ahead and use the PMP20634 and operate it at much lower current as you can see from the test results given in the PMP20634 webpage.
Regards,
Gerold
100mA? I don't think thats enough power correct? I need atleast 12V at 800mA power supply if you add up all the components but like I said I'm trying to get from the 12VDC to 5VDC to the LP38692-ADJ 3.3VDC 1Amp thats were i need help I am going to build up the PMP20634 then i just need to supply the three loads im thinking like this
12VDC 1amp to these loads below.....
--------------------------------- +5vdc 350mA max = 1.75watts
--------------------------------- -5vdc 350mA max = 1.75 watts
---------------------------------+5vdc 1amp to the LP38692 3.3 VDC a 1amp = 5watts + 3.3watts = 8.3watts
total power supply loads needed = 11.8Watts
Please double check my math but the issue really is load item #3 the 5VDC 1amp says it will make the lp38692 way to HOT so I tried 4.00VDC at 1amp but can i do this?
Hi Wesley
As I mentioned earlier, you can use the LP38692 provided the input is lower, such that the drop across the LDO is not high.
I was able to create the design using LP38692 in WEBENCH for a 4.3V Vin, 3,3V Vout @ 1A
You can refer to the Power Architect design that I shared with you to step it down to the intermediate 4.3V rail.
Regards,
Gerold
Hi Wesley,
For your power requirements of 8.5W, the 12W power supply should be enough (assuming the +5V, 1A is only powering the LP38692). Just ensure that the power supply efficiency for the TPS563209 and TPS63710 is high enough (greater than 80%) at the max output current.
Regards,
Gerold