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Buck Converter selection TPS5403

Carlo Bocatto
Prodigy 220 points
Other Parts Discussed in Thread: TPS5403, TMS320F28027, TMS320F28027F

Hey guys, 

So I am currently designing a PCB and well I'm trying to select a converter to best fit my needs. MY checklist is as follows:

I need the converter to be able to handle greater than 12V with up to 24 preferable, be able to handle high amperage at the very least 6 amps with 11-15 amps preferable, and be able to output 3.3 Volts at an amperage less than 1.7.  Currently I believe I found a great solution in the TPS5403 (link here: ) however I am worried that this will not be able to take it as the maximum inductor current is 3.1 amps. The goal of this is to step down the voltage and current to feed a TMS320F28027F chip (link here: ) 

The reason the voltage and amperage is so high is because the power is coming from the same source as the DC motor.  Any advice is appreciated, Thank you all in advance!!!

Carlo

  • 0
    TI__Guru**** 191445 points
    TPS5403 is minimum 2.2 A current limit. What are your comments about 6 or 11 to 15 A? If you only need 1.7 A output at 3 .3 V, no way the tPS5403 will draw anywhere near that current. At 12 V input (worst case) TPS5403 will draw about .57 A from the input supply. I don't think I understand your concern.