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TPS23754/6 as Buck Converter

Luis Cordova
Intellectual 1940 points
Other Parts Discussed in Thread: TPS23754, TPS23753A

Hello,

If I wanted to use the TPS23754/6 as a buck converter, what would I need to do with the following pins:

APD

CLS

PPD

DEN

Vdd

Vdd1

After reading the 'Implementing a Buck Converter with TPS23753A' document, it seems the schematic shown on page 3 may be a good one to follow:

Vdd tied to Vdd1 as recommended in the datasheet;

DEN either connected to Vdd via 24.9k ohm resistor, or to Vss to disable Hotswap, since Hotswap may not be necessary

PPD to Vss or float

CLS to Vss via 1.27k ohm resistor

APD to resistor divider off external supply, ARTN to gnd and T2P to ARTN (gnd).

Thanks!

  • 0
    TI__Mastermind 41770 points
    Hi Luis,
    Detection should still be 25k to VDD. Also the class resistor should be designed based on the power level. Please see the TPS23754 datasheet. Your recommended PPD, VDD1 and APD are okay.
    For the T2P, you may still to know whether the PSE can provide 25W so you will still need this pin not connected to GND. Or is this a 13W solution? If so, why not use the TPS23753A solution?
  • 0 in reply to Darwin Fernandez
    TI__Intellectual 1940 points
    Hey Darwin,
    Thanks for the great and fast response.
    The class resistor should be for class 4 (63ohm), my mistake.
    This is a 25W solution; should T2P connect to ARTN via 500 ohm resistor? This is still unclear to me.
    Thanks again.
  • 0 in reply to Luis Cordova
    TI__Mastermind 41770 points
    Hi Luis, T2P is an open drain pin and goes LOW when the PSE presents 2 events to the PD and thus tells the PD it can provide 25W. It's up to you on how to use it. You can pull it up to thorugh a resistor to VOUT. So you can startup pulling light loads then if T2P is LOW, you can pull 25W.