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DS64MB201 - Power design

Kawai
Guru 19785 points

Other Parts Discussed in Thread: TPS54426, DS64MB201, DS64BR401

Our customer is considering to power the device with DC/DC converter, TPS54426.

What is the recommended power design for DS64MB201 ?

If you see the User Guide of DS64BR401, I found EVB is powering through LDO, but do you need to add LDO or LC filter ?

Can you just power from the DC/DC ?

  • 0
    Guru 19785 points

    Please give us your help how the user should design the power line.

    Our customer is considering to power the device from the DC/DC converter.

    I am thinking that the switching noise could affect the repeater characteristics as the evaluation board uses LDO.

    Our customer may not be able to use the LDO.

    Could you please give us the recommendation of the input filter, such as LC value ?

    Best Regards,

    Kawai

  • 0 in reply to Kawai
    TI__Genius 13475 points

    Kawai-san

    Design of the LC filter will depend upon the expected noise from the DC-DC converter.   The loop bandwidths of the device are quite high, compared to the switching frequency of the DC-DC converter, and as a result any noise which is present on the input will be transferred to the output.   Our evaluation board uses an LDO because this provides a very clean supply for the device.

    As to the question of ESD protection, it can be considered as diodes between each pin and Vdd and GND - such that the diode becomes forward biased when the pin potential is higher than Vdd or lower than Vss.

    Mark Sauerwald