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TPSM33615: TPSM33615RDNR vs. TPSM33615FRDNR (EMC, Performance)

Christoph Hillebrand
Prodigy 20 points
Part Number: TPSM33615

Tool/software:

Hello, 

our PCBA manufacturer has sourcing problems for TPSM33615RDNR (and also TPSM33625RDNR). 

I received the question, if they can use TPSM33615FRDNR as this part is available. 

In our system, there are use cases, in which only little power is consumed (light loads). 

No Synchronization is used, and the frequency is fixed to 1 MHz via the RT resistor. 

I don't want to take risks according EMC and Performance (e.g. ripple), what is your proposal about that?

The schematics: 


If the risk is too high about EMC and performance, I would like to make contact with the sales team please.

  • 0
    TI__Expert 4900 points

    Hi Christoph,

    Changing to the TPSM33615FRDNR from TPSM33615RDNR, would provide practically identical performance. Difference between the two devices is that the "FRDNR" variant gives you the option to choose PFM or FPWM mode, if you ground the pin it will be set in PFM mode. Which is the same mode of operation as the "RDNR" device. 

    The "FRDNR" variant will run at 1MHz, so would be the same switching frequency as your current design.

    Only thing I would recommend changing in your design is to use a zero ohm resistor on R37 to ensure the pin is grounded, if you change to the "FRDNR" variant.

    Thanks,

    Dino