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TPA3255: output phase reversal and automatic output after power on

Gary Zeng
Intellectual 1195 points
Part Number: TPA3255

Tool/software:

Hi Ti experts,

My customer uses TPA3255 to drive linear motor.

Q1. We give the input signal IN_A a high level (6V) DC, IN_B input 1V DC, and the output OUT_A outputs a low level (0V); IN_A inputs a low level (1V), and OUT_A outputs a high level (30V). Is this normal? Or which pin can be used to set the positive and negative outputs?

Q2. When powered on, the OUT pin will have an output voltage, the motor will go down in one direction, and then return to normal. Is there a way to control the amplifier to start slowly when powered on? Or is there an enable pin similar to 3886, which can control the output power by controlling its voltage/current.

Below is our circuit connection, VDD=30V.

  • 0
    TI__Genius 9175 points

    Hi Gary,

    The configuration you have set the device to is for differential input and differential output. This means you will need to look at the differential voltage to know what the device is doing. Keep in mind that it is an inverting amplifier.

    In addition, you should be using DC blocking caps on the input and have LC filters on the output to get proper functionality.

    Regards,

    Ramsey