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LM51551: Schematics Review

Adithya Anil
Prodigy 150 points
Part Number: LM51551


Hi,

Kindly review the schematics of the part LM51551DSST for an input voltage of 9-36V and an output of 48V, 4A.

ITMS_48V BOOST.pdf

  • 0
    TI__Mastermind 19715 points

    Hello Adithya,

    Thanks for reaching out to us via e2e.

    Here are my comments on your schematic:
    Please use bigger ceramic ceramic capacitors on the output.
    Electrolytic capacitors are just not fast enough to store enough energy within each cycle.
    You should have some 10s of uF as low ESR ceramics and 100s of uF as electrolytic caps.
    I would recommend adding a footprint for a gate resistor and maybe also for a snubber across the diode, so that these components can easily be added when necessary.
    The components of the compensation network are pretty much off. 150nf for the HF capacitor is much too big.

    I would suggest that you download the Quickstart calculator from our website:
    www.ti.com/.../SNVC224
    This tool will help you to properly calculate the external components.

    Best regards
    Harry

    All information in this correspondence and in any related correspondence is provided “AS IS” and “with all faults” and is subject to TI’s Important Notice (www.ti.com/.../important-notice.shtml).