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TPS65400 EVM Regulation and Soft Reset issues

Mark Nohr
Intellectual 570 points

So far I've investigated using two different EVMs. One was bought from Mouser and a second was provided by TI (arrived with seals broken). Neither one was fault free out of the box.

The 1st EVM had two outputs faulted and using soft reset cause the 3V3 output to go unstable.

The second EVM had one channel faulted and applying a soft reset didn't seem to cause the 3V3 output to change at all.

Fullscreen 1st EVM Config File.xml Download 
<?xml version="1.0" encoding="UTF-8"?>
<PI-Commander_TPS65400 version="1.0">
    <register code="10">0000</register>
    <register code="D0">0000</register>
    <register code="D1">0000</register>
    <register code="D2">003C</register>
    <register code="D4">0000</register>
    <register code="DC">0002</register>
    <registerWithPage code="D3" page="03">0000</registerWithPage>
    <registerWithPage code="D3" page="02">0000</registerWithPage>
    <registerWithPage code="D3" page="01">0000</registerWithPage>
    <registerWithPage code="D3" page="00">0000</registerWithPage>
    <registerWithPage code="D5" page="03">0000</registerWithPage>
    <registerWithPage code="D5" page="02">0000</registerWithPage>
    <registerWithPage code="D5" page="01">0000</registerWithPage>
    <registerWithPage code="D5" page="00">0000</registerWithPage>
    <registerWithPage code="D6" page="03">0001</registerWithPage>
    <registerWithPage code="D6" page="02">0001</registerWithPage>
    <registerWithPage code="D6" page="01">0001</registerWithPage>
    <registerWithPage code="D6" page="00">0001</registerWithPage>
    <registerWithPage code="D7" page="03">000C</registerWithPage>
    <registerWithPage code="D7" page="02">0004</registerWithPage>
    <registerWithPage code="D7" page="01">0008</registerWithPage>
    <registerWithPage code="D7" page="00">0000</registerWithPage>
    <registerWithPage code="D8" page="03">0014</registerWithPage>
    <registerWithPage code="D8" page="02">0014</registerWithPage>
    <registerWithPage code="D8" page="01">0014</registerWithPage>
    <registerWithPage code="D8" page="00">0014</registerWithPage>
    <registerWithPage code="D9" page="03">0003</registerWithPage>
    <registerWithPage code="D9" page="02">0003</registerWithPage>
    <registerWithPage code="D9" page="01">0004</registerWithPage>
    <registerWithPage code="D9" page="00">0004</registerWithPage>
    <registerWithPage code="DD" page="03">0000</registerWithPage>
    <registerWithPage code="DD" page="02">0000</registerWithPage>
    <registerWithPage code="DD" page="01">0000</registerWithPage>
    <registerWithPage code="DD" page="00">0000</registerWithPage>
    <registerWithPage code="DE" page="03">0002</registerWithPage>
    <registerWithPage code="DE" page="02">0002</registerWithPage>
    <registerWithPage code="DE" page="01">0002</registerWithPage>
    <registerWithPage code="DE" page="00">0002</registerWithPage>
    <registerWithPage code="DF" page="03">0098</registerWithPage>
    <registerWithPage code="DF" page="02">0098</registerWithPage>
    <registerWithPage code="DF" page="01">0098</registerWithPage>
    <registerWithPage code="DF" page="00">0098</registerWithPage>
    <registerWithPage code="F0" page="03">0001</registerWithPage>
    <registerWithPage code="F0" page="02">0001</registerWithPage>
    <registerWithPage code="F0" page="01">0001</registerWithPage>
    <registerWithPage code="F0" page="00">0001</registerWithPage>
    <registerWithPage code="F1" page="03">0001</registerWithPage>
    <registerWithPage code="F1" page="02">0001</registerWithPage>
    <registerWithPage code="F1" page="01">0001</registerWithPage>
    <registerWithPage code="F1" page="00">0001</registerWithPage>
    <SchematicLabel id="CSS1">0.01uF</SchematicLabel>
    <SchematicLabel id="CSS2">0.01uF</SchematicLabel>
    <SchematicLabel id="CSS3">0.01uF</SchematicLabel>
    <SchematicLabel id="CSS4">0.01uF</SchematicLabel>
    <SchematicLabel id="RFB1SW1">9.53kΩ</SchematicLabel>
    <SchematicLabel id="RFB1SW2">12.7kΩ</SchematicLabel>
    <SchematicLabel id="RFB1SW3">21.5kΩ</SchematicLabel>
    <SchematicLabel id="RFB1SW4">22.1kΩ</SchematicLabel>
    <SchematicLabel id="RFB2SW1">40.2kΩ</SchematicLabel>
    <SchematicLabel id="RFB2SW2">10.2kΩ</SchematicLabel>
    <SchematicLabel id="RFB2SW3">6.81kΩ</SchematicLabel>
    <SchematicLabel id="RFB2SW4">10.5kΩ</SchematicLabel>
    <ENSW id="ENSW1">2</ENSW>
    <ENSW id="ENSW2">2</ENSW>
    <ENSW id="ENSW3">2</ENSW>
    <ENSW id="ENSW4">2</ENSW>
</PI-Commander_TPS65400>
Fullscreen 2nd EVM Config File.xml Download 
<?xml version="1.0" encoding="UTF-8"?>
<PI-Commander_TPS65400 version="1.0">
    <register code="10">0000</register>
    <register code="D0">0000</register>
    <register code="D1">0000</register>
    <register code="D2">003C</register>
    <register code="D4">0000</register>
    <register code="DC">0000</register>
    <registerWithPage code="D3" page="03">0000</registerWithPage>
    <registerWithPage code="D3" page="02">0000</registerWithPage>
    <registerWithPage code="D3" page="01">0000</registerWithPage>
    <registerWithPage code="D3" page="00">0000</registerWithPage>
    <registerWithPage code="D5" page="03">0000</registerWithPage>
    <registerWithPage code="D5" page="02">0000</registerWithPage>
    <registerWithPage code="D5" page="01">0000</registerWithPage>
    <registerWithPage code="D5" page="00">0000</registerWithPage>
    <registerWithPage code="D6" page="03">0001</registerWithPage>
    <registerWithPage code="D6" page="02">0001</registerWithPage>
    <registerWithPage code="D6" page="01">0001</registerWithPage>
    <registerWithPage code="D6" page="00">0001</registerWithPage>
    <registerWithPage code="D7" page="03">000C</registerWithPage>
    <registerWithPage code="D7" page="02">0004</registerWithPage>
    <registerWithPage code="D7" page="01">0008</registerWithPage>
    <registerWithPage code="D7" page="00">0000</registerWithPage>
    <registerWithPage code="D8" page="03">0014</registerWithPage>
    <registerWithPage code="D8" page="02">0014</registerWithPage>
    <registerWithPage code="D8" page="01">0014</registerWithPage>
    <registerWithPage code="D8" page="00">0014</registerWithPage>
    <registerWithPage code="D9" page="03">0003</registerWithPage>
    <registerWithPage code="D9" page="02">0003</registerWithPage>
    <registerWithPage code="D9" page="01">0004</registerWithPage>
    <registerWithPage code="D9" page="00">0004</registerWithPage>
    <registerWithPage code="DD" page="03">0010</registerWithPage>
    <registerWithPage code="DD" page="02">0010</registerWithPage>
    <registerWithPage code="DD" page="01">0010</registerWithPage>
    <registerWithPage code="DD" page="00">0010</registerWithPage>
    <registerWithPage code="DE" page="03">0002</registerWithPage>
    <registerWithPage code="DE" page="02">0002</registerWithPage>
    <registerWithPage code="DE" page="01">0002</registerWithPage>
    <registerWithPage code="DE" page="00">0002</registerWithPage>
    <registerWithPage code="DF" page="03">0098</registerWithPage>
    <registerWithPage code="DF" page="02">0098</registerWithPage>
    <registerWithPage code="DF" page="01">0098</registerWithPage>
    <registerWithPage code="DF" page="00">0098</registerWithPage>
    <registerWithPage code="F0" page="03">0001</registerWithPage>
    <registerWithPage code="F0" page="02">0001</registerWithPage>
    <registerWithPage code="F0" page="01">0001</registerWithPage>
    <registerWithPage code="F0" page="00">0001</registerWithPage>
    <registerWithPage code="F1" page="03">0001</registerWithPage>
    <registerWithPage code="F1" page="02">0001</registerWithPage>
    <registerWithPage code="F1" page="01">0001</registerWithPage>
    <registerWithPage code="F1" page="00">0001</registerWithPage>
    <SchematicLabel id="CSS1">0.01uF</SchematicLabel>
    <SchematicLabel id="CSS2">0.01uF</SchematicLabel>
    <SchematicLabel id="CSS3">0.01uF</SchematicLabel>
    <SchematicLabel id="CSS4">0.01uF</SchematicLabel>
    <SchematicLabel id="RFB1SW1">9.53kΩ</SchematicLabel>
    <SchematicLabel id="RFB1SW2">12.7kΩ</SchematicLabel>
    <SchematicLabel id="RFB1SW3">21.5kΩ</SchematicLabel>
    <SchematicLabel id="RFB1SW4">22.1kΩ</SchematicLabel>
    <SchematicLabel id="RFB2SW1">40.2kΩ</SchematicLabel>
    <SchematicLabel id="RFB2SW2">10.2kΩ</SchematicLabel>
    <SchematicLabel id="RFB2SW3">6.81kΩ</SchematicLabel>
    <SchematicLabel id="RFB2SW4">10.5kΩ</SchematicLabel>
    <ENSW id="ENSW1">2</ENSW>
    <ENSW id="ENSW2">2</ENSW>
    <ENSW id="ENSW3">2</ENSW>
    <ENSW id="ENSW4">2</ENSW>
</PI-Commander_TPS65400>
TI_65400 EVM issues.doc

  • 0
    TI__Intellectual 2590 points

    Hi Nohr,

    do you use PMbus to control the output voltage?

    could you remove the digital control and just apply the input voltage and test the output voltage of each channel?

    if this conditon is good, we may need to check the software connection.

    let me know you test result.

    thanks!

  • 0 in reply to Eric Guo1
    Intellectual 570 points
    Hi Eric,
    I'm using the TI supplied software tools and USB IO module. Please reference the attached document "65400 EVM issues.doc"
    The problem I'm pointing to is triggered by a soft reset command issued by the TI tools.
    Also note there are more issues than this explained in the document. Can you help me understand why the different EVMs are having different failures out of the box?
    -Mark