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TDA4VM: Dual PMIC power supply scheme of TDA4VM

Liangliang Gao
Prodigy 140 points
Part Number: TDA4VM

Hi,  TI experts：

       We encountered a problem when tda4 bringup debugged PMIC. The problem is described as follows: 

       Our Power supply scheme is  "TPS65941213RWERQ1 (hereinafter referred to as 1213) + TPS65941111RWERQ1 (hereinafter referred to as 1111) dual PMIC supplies power to tda4" .

       The schematic diagram is shown in Figure-1, After V_3V3_TDA4 power on with 3.3V，Pull TDA4_PWR_EN (1213 PIN20) high to 3.3V, VOUT_LDOVINT(PIN2) and VOUT_LDOVRTC(PIN3) of 1213 and 1111 output 1.8V normally. The communication between 1213 and 1111 is normal (GPIO5/GPIO6). PMICA_MCUIO3V3_EN(1213,GPIO9(PIN 19)) will output 10 periodic pulses(as shown on Figure-2). There is no output from other bucks and LDOs, please help to check the possible problems, Thanks. 

       The project cycle is urgent. We are currently troubleshooting, please ask TI experts to assist us as soon as possible. 

 

Figure-1:

      

 

 

      Figure-2：

  • 0 in reply to Liangliang Gao
    TI__Mastermind 47670 points

    It is difficult to read your schematic screenshots or the PMIC connections.  My guess is the PMIC is detecting and issue (output short, over-current, etc) in the next phase of the start-up sequence.  Have you ohm-ed the output supplies to ensure there is no short to ground (or other supply)?  Do you see any voltage change in the output of the load switch?  My understanding is the scope capture is for the enable to the load switch.  What about the next power supply(s) in the sequence, do you see any activity?