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no image Wednesday, August 23, 2017 by Bhargav Jani

DC-DC Power supply design in Automotive

Hello All,

Currently, working on project, in which i have to design A DC-DC Power supply for automotive. I am currently stuck at selecting the IC (after looking for many like TPS40170, LT8390A, LM25117-Q1) all being the 4 switch buck-boost topology IC.

I have attached a diagram to show, how the system appears to be, I am using s dsPIC 30F4011, to control the IC (Digitally PWM) . Thus IC needs to have digital input pins or it can be done via Digi POT ...(not a major issue)

The input req will be from 5V to 48V (nominal battery voltage) , Vout - (from 0.5V to 40V) and Iout (upto 7A) depending on the loads attached to the ECU

The ECU Kl30 is a pos pin through which the current will flow through to the ECU to KL31

The KL31 pin also has a inverting power supply (neg input voltage or neg currents ) to the other system comp in automotive or other ECU-s for that matter.

I need your suggestions regarding LM5170.Q1 (Multiphase controller) attached. It has a dual battery system controller.

I am not sure, whether I can use this IC or look for other IC (and if it can be used as buck-boost controller in the application.

Is the diagram lacking some circuitry.

Suggestions, changes, review welcomed#
http://www.ti.com/product/LM5170-Q1/description

reg
Bhargav



SMPS.PNG

Comments

  • by  Neil Mula (edited)
    Hi Bhargav, Specifically it is stated as automotive 48-V and 12-V dual battery systems, therefore it good to have this voltage rating in order to optimized its operation. Also "...it regulates the average current flowing between the high voltage and low voltage ports...." , this specify its application and if you have that IC then, try to have some test with your designed circuitry. Hope it helps. Best, Neil

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