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[FAQ] TPS55288: How to test the bode plot of TPS55288 I2C version silicon

Part Number: TPS55288

Hi team,

If customer wants to capture Bode plot for TPS55288 I2C version silicon, what is the recommend way to do? Any setup suggestion?

Many thanks!

  • Dear Sir,

    You need to use the external feedback mode to test the bode plot. Here's the step based on the TPS55288EVM board:

    1. Set the jumper JP2 and JP3 according to the  attached user guide section 2.2.2. 

    slvubo4 TPS55288 400kHzEVM UG.pdf

    2. Set the TPS55288 silicon works in the external mode via I2C control, please refer to datasheet '7.6.4 VOUT_FS Register(Address = 4h)',  set bit7(FB) to 1.

    3. Inject the signal across R3 to test bode plot. (below picture shows the R3 location, it is in series with the upper side dividing resistor.)