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TPSM41615: TPSM41615 sync pin connection

sandeep kare
Prodigy 30 points
Part Number: TPSM41615
Other Parts Discussed in Thread: TPSM41625

For part TPSM41625:standalone configuration

1        sync pin needs clock source matching switching frequency requirement from external source or can be left open?

2        pin 17 and 18 which are PGND they are not connected to ground in EVM whereas in datasheet connected to ground.

          which on to follow?

3        power modules are having PGND and AGND separately and finally shorted together.

          How to follow grounding for the entire design in a better way?

  • 0
    TI__Expert 5310 points

    Hello,

    To answer your questions:

    1.  The sync pin may be left open and the resistor on the RT pin will set the device's switching frequency. If you choose to use the external clock synchronization, the datasheet recommends using an external clock with a frequency that is +/- 20% of the frequency set by the RT resistor.

    2. Pin 17 and 18 are PGND pins, according to the EVM schematic, these pins should be connected to PGND. I would connect these to PGND, and I will verify the EVM connection.

    3. I recommend separating AGND and PGND planes and connecting these at a single point with a 0ohm resistor or a net tie. The AGND is a quiet stable ground reference for the device's control circuitry and pin strap resistors and the PGND acts as a noisy current sink for the device's power stage. I recommend the layout guidelines in section 10 of the datasheet. Feel free to post on E2E regarding further AGND/PGND guidance on this device as well.

    Regards,

    Alec Biesterfeld