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Original question:

TPS546C23: TPS546 Schematic

TPS546C23: Schematic Review of TPS546C23

Kapil Kesharvani
Prodigy 250 points
Part Number: TPS546C23


Hello TI Team,

I have done the schematic design of TPS546C23 buck- regulator with the below requirement. I want to control output from PMBus and Hardware.

1. 1.3V@10-13A , O/P ripple= 10mV Vp-p, Voltage tolerance= 1%

2.  3.3V@22-27A, O/P ripple= 9mV Vp-p, Voltage tolerance= 5%

Can someone review it and provide the valuable inputs by generation the o/p with both the option? 

  • 0
    TI__Genius 11416 points

    Hi Kapil,

    Here are my inputs:

    1. The note at the bottom right says 400kHz switching frequency, but the RRT of 66.5K will give 300kHz, not 400kHz 
    2. PVIN and AVIN pins must have the same potential. Please remove 2.2Ω (or populate 0Ω) and short PVIN and AVIN.
    3. Bypass BP3 to AGND and BP6 to PGND.
    4. Please ensure the phase margin is greater than 45°, and the error amp gain should not hit the GBWP. 

    For proper compensation and to review your schematic, please use the Excel calculator:

    https://www.ti.com/lit/zip/slurb05