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TPS23751: Best solution to reduce output noise?

Pablo Riveiro
Prodigy 10 points
Part Number: TPS23751
Other Parts Discussed in Thread: PMP11254

Hello,

We've designed a new product that utilizes the TPS23751PWP. Schematic and layout are very similar to PMP11254 reference design. Test results we've obtained are consistent with the ones included in the reference design. Now, in order to meet the specifications of a device connected to this power supply, we need to minimize the output noise. Less than 10mV should be enough. A simple and effective solution for this can be achieved by using second stage LC output filter. What stability issues we have to take into consideration with this type of controller? 

Best regards,

  • 0
    TI__Mastermind 21320 points

    Hello Pablo,

    If you add another LC filter to the output, the step response is going to change. The feedback network is optimized for the current output capacitance / inductance. 

    Therefore, you will also need to redesign the feedback network, at least the poles and zeros. 

    The following application note has a section on how to design the feedback network for a flyback, which can help you calculate the values needed:

    http://www.ti.com/lit/an/slva305c/slva305c.pdf

    If this post answers your question, please indicate so by marking this thread as resolved. Thank you.

     

    Regards, 

     

    Michael P.

    Applications Engineer

    Texas Instruments