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Original question:

WEBENCH® Tools: #Isolated 200W power, from 44V DC battery to provide 2VDC @150'C~TPS40200/TPS54362/LM116/TPS62110#full bridge...

High temperature DC/DC converter :

VICTOR BEST
Intellectual 350 points
Other Parts Discussed in Thread: TPS62110-HT, TPS40200-HT

Tool/software: WEBENCH® Design Tools

We are seeking a solution to the age old problem, how to get high efficiency conversion at high temperatures.

Project : Vin(battery)=40VDC : Vo= +12V & -12V @1Amp (24Watts power) regulation of 0.5V is acceptable.

Temperature range A:100'C to 125'C the we need B:125-150'C, and finally C:150'C to 175'C.

1. What topology would you recommend a/b/c temperature ranges, could we use the same topology ?

2. Would you be able to recommend TI part that we might use for all three stages of development?

Thanks in advance for your help.

Victor

  • 0
    TI__Mastermind 35210 points

    As far as I am aware, we only have power regulators rated up to 150degC junction temperature.

    With the minimum requirement of 125degC ambient the design is asking alot for 24W out.

    Additionally, I imagine you will have trouble finding passive componets rated for those tempertures? X7R dielectric is rated up to 125degC.

  • 0 in reply to Marshall_Beck
    Intellectual 350 points

    Hello Marshall_Beck,

    TI have a regulator TPS62110-HT which is specified to 175'C. Also LT8610 is operational to 210'C.

    Using 8XR capacitors we get improved thermal performance, to 210'C.

    we are looking for as many links to =/-12V DC/DC converter circuit i will look at each one checking how it might be adapted for the Voltage/temperature range.

    So as many application circuits as posible please.

    Thanks in advance for your help and considerations.

    Victor

  • 0 in reply to VICTOR BEST
    TI__Mastermind 35210 points

    You require 44V input voltage?

    Here is controller

    http://www.ti.com/product/TPS40200-HT

    I unaware of converter or module that has high temperature range. New products are focused on higher-junction temperature rating, but the p/n above is one example of product that fulfills requirement.

    You can create negative supply through inverting buck boost if you want to go with non-isolated design.

    Please let us know if you need more assistance with your design.

  • 0 in reply to Marshall_Beck
    Intellectual 350 points

    HELLO Marshell_Beck,

    I have had a look at the TPS40200-HT($100USD), very impressive we currently use the Analog LT8610AX($105USD). The obvious advantage with the TI part is the working voltage as linear part works at 42V.

    Thank you for your help we will get some on order and give them a try.

    Thanks again, have a good thankgiving.

    Cheers

    Victor