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TPS65916：TPS65916 will form a short circuit after power transmission

dan lu
Prodigy 200 points
Part Number: TPS65916

According to the accessory, when the power supply is used, the current will rise slowly, and the power supply will enter the current protection mode.

VDD = DC 5V , V33 = DC  3.3V

  • 0
    TI__Mastermind 20580 points
    Hi Dan,

    Thank you for your question, but what you are asking is not clear. Can you please clarify whether you are asking about the outputs and what information are you seeking.

    Thanks & Best Regards,
    Scott
  • 0
    TI__Genius 10000 points
    Dan,

    Welcome to E2E! Can you also provide the full part number of the device you are using?

    Thanks,
    Nastasha
  • 0 in reply to Scott Monroe
    Prodigy 200 points
    Hi Scott Monroe,

    The DC power supply is used to supply both 3.3V and 5V, but its current will rise and it will enter current protection in a few seconds, so I have a few questions to ask:

    1. I would like to ask if there is a short circuit in the circuit through such a connection method.

    2. Will the supply of 3.3V and 5V simultaneously cause a short circuit?

    1. I would like to ask if there is a short circuit in the circuit through such a connection method.

    2. Will the supply of 3.3V and 5V simultaneously cause a short circuit?


    My connection method is as follows:

    Pin (1.2.12.13.14.27): GPIO1~4, 6 are Floating

    Pin(15): GPIO5 is connected to pull-up resistor 10k to 3.3V

    Pin (3.5.8.22): LDOX_IN is connected to DC 5V (no capacitor is connected to 2.2uF)

    Pin (4.6.7.21.23): LDOX_OUT are Floating

    Pin(16): BOOT is connected to pull-down resistor 1.5K to GND

    Pin (10.18.29.32.46): SMPSX_IN is connected to DC 5V (without connection capacitor)

    Pin (11.19.30.31.47): SMPSX_SW is connected to the inductor 1uH and the capacitor 47uF to GND.

    Pin (9.17.28.33.45): SMPSX_FDBK is connected between inductor 1uH and capacitor 47uF

    Pin(35.36): I2C_SDA_SDI, I2C_SCISCK are connected to pull-up resistor 10K to 3.3V

    Pin (20.24.25.26.38.39.41.43.44.48): Directly connected to the ground.
    VPROG, PWRON, RESET_OUT, INT, ADCIN (1, 2), REFGND, LDOVANA_OUT, LDORTC_OUT, SYNCCLKOUT

    Pin(40):VBG is Floating

    Pin(34):VIO_IN DC 3.3V (without connection capacitor)

    Pin(37):VCC_SENSE DC 5V (without connection capacitor)

    Pin(42):VCCA DC 5V (without connection capacitor)
  • 0 in reply to dan lu
    TI__Genius 10000 points

    Dan,

    Please provide the full orderable part number so that I can verify that you have the device configured properly for the OTP you are using.

    Regardless of OTP, there are a few issues with the connections in this schematic:

    1. RESET_OUT should not be grounded. This is a push-pull output that goes high when the device is finished turning on. Shorting to ground is not advised.

    2. INT should be left floating if not using it (though you will not be able to see if an interrupt is generated)

    3. LDOVANA_OUT, LDOVRTC_OUT, VCCA, and SMPSx_IN require capacitors (see recommended values in datasheet)

    4. SYNCCLKOUT should be left floating if you are not using it

    Please see the schematic checklist for how to handle each pin: www.ti.com/.../slvae13

    Thanks,

    Nastasha