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LM5176-Q1: LM5176(-Q1) Boost only use

Joseph Lacerte
Prodigy 10 points
Part Number: LM5176-Q1

Tool/software:

Hi,

We are considering the LM5176-Q1 for a step-up (boost-only) converter :

Vin : 10-16V

Vout : 42V

Iout : 10A max (420W)

The constant-current voltage foldback trick (snva846) would be very useful for battery charging/maintaining in our application.

#1 I am trying to size the output (boost-led) lower transistor(s) as it will handle the most power dissipation. Would you recommend using 80V devices for margin, or 60V would be acceptable.

#2 For the input leg (buck), as only the top transistor will be used ON all the time, may I consider a very low RdsON (but slow) device? Also, is omitting the lower transistor on this leg possible? (boost only)

Thank you,

Joseph.

  • 0
    TI__Mastermind 48961 points

    Hi Joseph,

    #1. for the MSOFET having a margin of 30% will be OK in most cases. So 60V MOSFET would be a good fit.

    (In case you have large over or undershoots then adding a snubber or gate resistor would be the better option.)

    #2. you still should keep the low side MOSFET (as it is required in the startup phase) but can then be sized lower.

    Best regards,

     Stefan