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MSP430F247 SMPS Power Supply

RAVI TEJA
Intellectual 270 points
Other Parts Discussed in Thread: MSP430F247, TPS560200

Hi,

We are designing power supply for MSP430F247 - used in one of our Smart Energy Measurement applications. A single 12V 5A SMPS will power up the on-board TPS560200 to provide 3.3V 200mA output for MSP430F247 & other board components. From the WEBENCH simulations, we observe 0.014V ripple on the TPS560200 output voltage. We are further smoothing this ripple out using 10uF & 100nF capacitors on each MSP430F247 supply pins. However, we still are worried whether the voltage ripples might interfere with the MSP430F247 operation.

Could someone please suggest if the above power supply configuration works good for MSP430F247? Please also let us know if there is a better way of approaching voltage ripples above. No RF components on board. MCU operating at 14MHz.


Regards,

Ravi

  • 0
    TI__Guru**** 202086 points
    Hi Ravi,

    Did you use the recommended passive components shown in the TPS560200 datasheet? At any rate you should not have any concern about a 14 mV ripple at 3.3V operation. The most important thing is that the ripple does not trigger a BOR reset and the threshold should not be crossed either during power-up or at the settled Vcc. Please keep in mind that the ripple will be reflected on GPIO outputs and will affect ADC readings if AVcc is used as the reference.

    Regards,
    Ryan
  • 0 in reply to Ryan Brown1
    Intellectual 270 points
    Thank you . And sorry for the delayed reply. I waited to test the circuit and reply. We tested the circuit today and MSP is just working fine. Adding more capacitors on TPS560200 output reduced ripple further to 4mV. Thanks again for the suggestions.

    Thanks,
    Ravi

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