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OPA548: About application question with OPA548

Jimmy WANG
Genius 4085 points
Part Number: OPA548

Hi team,

If the customer wants to increase the output current of the sine wave. Can use OPA548 to design?

Vin signal is +-3V 10mA capability. use Inverting amplifier with G=1. I hope output capability is V=+-3V ,currenct up to 2A

is this doable? or any application note can share to me. thx 

  • 0
    Guru 140200 points

    Hi OPA548,

    can you tell more about your application? What is frequency of sine wave? And what load is connected to the output of OPA548?

    Kai

  • 0
    TI__Guru* 93105 points

    Hi Jimmy,

    The OPA548 certainly can be and often is used as a power booster. Can you provide us with an elementary schematic of the application, and provide answers to Kai's questions?

    Do you have any idea what power supply levels are being planned for V+ and V-? For a low voltage output of +/- 3 V (2 Amps), it is best to use minimum supply levels that meet the application requirements so as to minimize the OPA548 power dissipation.

    Regards, Thomas

    Precision Amplifiers Applications Engineering

  • 0 in reply to kai klaas69
    Genius 4085 points

     Hi Kai,

    This is a requirement from end customers, they don't yet know what the load is.
    The current requirement is to amplify the positive and negative 3V signal into a positive and negative 30V current 0.2A power supply.

    Frequency of sine wave is 70Hz

    Do I want to use the Power OP to directly amplify or use a transformer to amplify the voltage?

  • 0 in reply to Jimmy WANG
    TI__Guru* 77521 points

    Hi Jimmy,

    Vin signal is +-3V 10mA capability. use Inverting amplifier with G=1. I hope output capability is V=+-3V ,currenct up to 2A

    Do I want to use the Power OP to directly amplify or use a transformer to amplify the voltage?

    You have to use power op amp to generate the output power with Vout = ±3Vpk and Iout =±2Apk at 70Hz. 

    You may use transformer to transfer or lower from input to output power transfer (minus the inefficiency), but you are unable to create power or energy from input to output via transformer (conservation of energy).  

    If you have other questions, please let us know. 

    Best,

    Raymond