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#