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Unveiling the OPA548: precision power supply project


Powering performance

In the realm of electronics, the importance of a reliable and adaptable power supply cannot be overstated. Whether it’s for prototyping circuits, powering small appliances, or driving various loads, having a versatile power source at hand is indispensable. Enter the project featuring a compact yet powerful power supply capable of delivering a wide range of output voltages with precision and stability.

Unveiling the specifications

The heart of this project lies in its ability to provide a DC output ranging from 1.2 to 20 volts, coupled with a current limiter that can be finely adjusted from 0 to 5 amps. This flexibility ensures compatibility with an array of devices and applications, making it a go-to choice for electronics enthusiasts and professionals alike.

Tested and proven: performance insights

In rigorous testing, the circuit has demonstrated its prowess by delivering a steady 250mA output even without the aid of a heat sink, showcasing its efficiency and reliability. Moreover, it boasts the capability to sustain a continuous load of 3A, with the capacity to handle peak loads of up to 5A, albeit requiring a sizable heat sink for optimal performance under full load conditions.

The core: OPA548 operational amplifier

At the heart of this project lies the low-cost yet high-performance OPA548 operational amplifier. Renowned for its ability to deliver high voltage and current outputs with exceptional accuracy, this operational amplifier serves as the cornerstone of the power supply, ensuring robust performance across various load conditions.

Exceptional performance: Key features

  • Wide Voltage Range: With an output voltage range extending from 1.2V to 20V, this power supply caters to diverse voltage requirements, offering unparalleled versatility.
  • Current Limiting Capability: Equipped with a current limiter adjustable up to 5A, users can precisely control the output current, safeguarding both the circuit under test and the power supply itself.
  • Temperature and Overload Protection: The internal protection mechanisms of the OPA548 safeguard against over-temperature conditions and current overloads, ensuring the longevity and reliability of the power supply.

Tailored control: Adjustable potentiometers

Fine-tuning the output parameters is made effortless thanks to the inclusion of trimmer potentiometers. PR1 facilitates the adjustment of output voltages, while PR2 enables users to set the current limit within the 0 to 5A range, providing unparalleled control and customization options.

Unlocking greater potential

For those seeking even higher output voltages, the project offers the possibility of achieving voltages ranging from 1.2V to 25V by utilizing input supplies of 30V DC. Simply replacing capacitors C3 and C4 allows for this expanded voltage range, providing users with greater flexibility to meet the demands of their specific applications.



Parts list




Conclusion: Empowering innovation

In summary, the power supply project featuring the OPA548 operational amplifier stands as a testament to innovation and efficiency in the realm of electronics. With its versatile output capabilities, precise current limiting, and robust performance, it empowers enthusiasts and professionals alike to bring their projects to life with confidence and precision. Whether for prototyping, testing, or powering various devices, this power supply project is poised to elevate the performance of electronic circuits with its unparalleled capabilities.

Source : (CC BY-SA 4.0)

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