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TPS65070 LCD and output power issue

Amrendra Kumar
Intellectual 270 points
Other Parts Discussed in Thread: AM1808, TPS65070

I am using TPS65070 PMIC in one of our design with AM1808 Processor.

Initially all the units works fine however uses of 9-12 months, some of these devices stops giving proper output at VDCDC and Isink1/2

Let me know if somebody in past has faced similar issue. I am seeing around 30% of devices coming like this from field.

  • 0
    TI__Genius 16870 points

    Hi Amrendra, 

    I am sorry that you are having issues on your products. What kind of environment are these devices subject to? (hot, cold, exposed, etc. ?) 

    If you can share more details on the failure and conditions, perhaps I can help you determine the cause. 

  • 0 in reply to Michael Green
    Intellectual 270 points

    These devices are being opereated in controlled environment and temperature is 20-30deg Celsius.

    I found two kinds of issue with TPS65070.

    1.The output across Isink1 and Isink2 is same as input i.e 5V. In working board it should be 14-15V.

    2.No output voltages on VDCDC2/3 and VLDO2  though the input voltage(5V) is available at pin 8,7 and 12 of the PMIC.

  • 0 in reply to Amrendra Kumar
    TI__Genius 16870 points

    1.The output across Isink1 and Isink2 is same as input i.e 5V. In working board it should be 14-15V.

    - What is the voltage on the wLED boost ouput? 

    -How many LEDs are you using? 

    -What is the input voltage to the boost?

    -What is the Vf of the LEDs you are using?

    -What is the set current for ISINK 1 and 2?

    -Did the LEDs come on when the ISINK drops to 5V? 

    -What state do you expect the LEDs to be at during this test? (On or off)

    2.No output voltages on VDCDC2/3 and VLDO2  though the input voltage(5V) is available at pin 8,7 and 12 of the PMIC.

    - Can you monitor the VINDCDCx, EN_DCDCx, Lx, and VDCDCx pins as you preform this test? 

    - Is the converter switching? 

    - Are there any glitches on the EN_DCDCx pins?

  • 0 in reply to Michael Green
    TI__Genius 16870 points

    Also, what is CON_CTRL1? 

    Can you read all of the I2C registers from the device and supply them to me?