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LM5163: Is it good for an unregulated input voltage?

Sebastian Siegfried
Intellectual 650 points
Part Number: LM5163
Other Parts Discussed in Thread: LMR16006,

Hi,

So far I used a LMR16006 buck converter for voltage regulation. The input voltage can vary pretty fast in between

+48VDC up to +57VDC (motor control, recuperation) and I want to replace it with a new buck converter IC,

that can handle up to +100VDC. 

In the datasheet of the LMR16006 is stated, that it works for an unregulated source and automotive, so this is really for a harsh environment

and I need something similar. Can I replace the LMR16006 with a LM5163 for a motor control application with unregulated source

or should I better choose another buck converter IC?

  • 0
    TI__Mastermind 27045 points

    Hi Tcha,

    LM5163 is good choice at the input variation up to 57V. You download the Calculator for LM5163 circuit design. 

    https://www.ti.com/tool/LM5163-LM5164DESIGN-CALC

    B R

    Andy

  • 0 in reply to Andy Chen
    Intellectual 650 points

    Hi Andy,

    I used WEBENCH for the design, but I want to be 100% sure that the regulator is stable, since the input voltage can change from +48VDC to +57VDC in  around 1ms, so it is everything else than a stable input. The LMR16006 could handle that very well in my old design, so I the LM5163 should do the same.

    In the datasheet is stated: To maintain stability, the feedback comparator requires a minimal ripple voltage that is in phase with the inductor current during the off-time. So this minimum ripple depends on the feedback path and the VIN buffering?

    I would be glad, if you can have a short look at my design:

  • 0 in reply to Sebastian Siegfried
    TI__Mastermind 27045 points

    Hi Sebastian,

    I assume you used LMR16006X 700KHz version, and load current 500mA

    So the reference circuit as below:

    .

    Pls note the output capacitance should be effective value after derating, so for 12V output, the ceramic cap voltage rating should be 35V or 50V.

    Layout looks good, place small Cin cap more close to VIN and GND pin for small loop area.

    B R

    Andy