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How to enduce the rIpple wave of the LM2576.5? PS: I have in strict accordance with the DATASHEET

Other Parts Discussed in Thread: LM2576

Hello,

         I want to made a power module for the AD by the LM2576.5, but the lm2576's ripple ware is so high that the AD can't get a clean signal.

                   My supply value: 15V

                  Interference value: +-10mv

         When I switch on the power:

                      The input ripple ware value : +-3v

                      The output ripplr ware value: +- 500mv 

      I have add more electrolytic capacitors ,the input ripple ware is reduce to +-200mv, then I can't do anything.

       If you have some good way to solve it , mail to :chenhuqing@163.com, please.

      I need your help ,thanks!!!!

                                                                                             chen-

  • Chen,

    If I understand correctly, you need to reduce the output voltage ripple.

    What is your target ripple voltage?

    The ripple voltage is largely determined by the esr of the output caps. Select low esr caps and use multiple in parallel.

    This will reduce the ripple. The problem may also be related to poor layout which can add series inductance to the output caps.

    Therefore, the caps must be connected by wide traces near to the inductor and with a good ground plane.

    Regards,

    Allan