Hi,
I'm looking to run 2 or more LMR10530x simple switchers in parallel to obtain a higher current output. Is this possible with the simple switcher?
Is there an easy way to do this?
Should I use two shottky diodes at the ouputs, and do a single voltage sense that runs back to both switchers?
My main concern is that it's possible that one switcher might fight the other. Is this something to worry about?
Best Regards,
Tony
Hi Tony,
The quick answer is that you probably could share the current, but the additional part cost and complexity probably isn't worth it. Your diode method would work but it would not balance the loads between the two parts.
You would need to add circuitry to sense the current on each loop and adjust the feedback voltage accordingly. The simplest way is too measure the current across the inductor either with DCR sensing or a resistor. Then based upon the voltage drop across the resistor you could compare to the voltage drop on the other and send an integrated error signal to a summing circuit on the fedback. In other words complex and too much work.
Much easier and cheaper would be to use one of our higher current parts. WIth a quick look a Webench on the TI home page I found the following 6 amp solution for you the LM20136
Regards,
Marc
