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TAS5624A: Queries for TAS5624A

Part Number: TAS5624A

Hello Audio Folks, can anyone help on below two questions from customer.

1. In system power on, customer GVDD and VDD will have an over shoot up to 13.2V. In the worst case, it can even reach 14.8V. The over shoot is around 2ms. After 2ms, then, it will fall back to 12.5V. In data sheet, both recommended and abs max only allow 13.2V. Will it be a problem? Below is the waveform.

2. For GVDD and VDD current, the total current is only 20mA + 12mA = 32mA in data sheet. But customer finds that the actual current is much much higher than this in power on. They want to know the exact value.

Regards,

Kes

  • Kes,

    Does the customer know why they are getting this overshoot? It is hard to say if this will damage the device or not but I will ask my team if they have any advice. What power supply is the customer using?

    What current are they measuring at start-up for GVDD and VDD?

    Regards,

    -Adam
  • Hi Adam, check with customer. The GVDD/VDD is from switching mode power supply. In starting up, power supply zener diode does not start working immediately leading an instantaneous high voltage output.

    For the GVDD/VDD current, they just measure one TAS5624A IC. It is around 180mA in PWM starting up. They don't measure other TAS5624A on the board. There may be variation.

    Customer urgently wants to get our feedback to proceed. Please help to expedite.

    Regards,
    Kes
  • Kes,

    180mA is too high, Please send me their schematic so I can check it.

    Have they checked multiple boards? Maybe that one IC has an issue.

    Regards,

    -Adam
  • Hello Adam, if 180mA is too high, what will be the nromal value? As I rememer, BU people suggested a total 1A for 3 to 4 power stages in starting up PWM. If this is true, 180mA is not too high and actually below the recommendation.

    Regards
    Kes
  • Kes,

    Once the system has been powered on, does the current stay at or near 180mA? Or is this just the current spike at start up?

    The steady state value is as stated on the datasheet.

    Regards,

    -Adam
  • Hi Adam, after PWM starting up, the current should drop down to a small value. I need to check with customer for how long the high current they see.

    Regards,
    Kes