OPA548 Operational Amplifier Current Amplifier 3A Continuous Current Wide Output Voltage Swing

OPA548 Operational Amplifier Current Amplifier 3A Continuous Current Wide Output Voltage Swing

Attention:
(1) The module interfaces of our module are clear and the performance is stable. Please perform functional verification under the corresponding experimental conditions in conjunction with the schematic diagram provided by our shop.
(2) The basic parameters of this module are mentioned below, providing PDF information of module information; engineering documents are not provided. If there are operational problems, please consult customer service.
(3) Before using the module, please read the detailed information of this module to understand the power supply and use restrictions, to avoid damage to the module due to improper operation.
(4) The modules of our shop are guaranteed to provide real module parameters, functions and pictures, all modules are tested before delivery.

Module Description:
As a low-cost, high-voltage, high-current operational amplifier, OPA548 device is suitable for driving various loads. OPA548 is powered by dual power supplies and have design flexibility.

OPA548 has internal overheat protection and current overload protection. It provides accurate user-selected current limit. Unlike other designs that use a power resistor in series with the output current path, OPA548 detects the load indirectly. Suitable for motor-driven speaker drive, transformer drive and audio amplifier. It can also amplify triangle wave, sine wave and square wave signals.

Module Parameters:
- Module model: OPA548
- Module type: low frequency power amplifier
- Input signal form: single-ended
- Input voltage range: 2Vpp (MAX.) (generally within the power supply range)
- Module input impedance: 10K ohm
- Module supply voltage: ±4V to ±30V
- Module supply current: ±4A (large output current requires large supply current)
- Module output impedance: low impedance
- Output voltage range: 54Vpp (MAX.) (at ±30V power supply)
- Output current: 3A (MAX.)
- Output power: 22.5W (MAX.)
- Module gain: 33 times (the default gain is 33 times, the first level is 11 times, the second level is 3 times, G1 = R1/R2 + 1, G2 = R2/R3 + 1)
- Input offset voltage: 1mV (MAX.)
- Input offset drift: 2uV/℃ (MAX.)
- Input bias current: 125nA (MAX.)
- Input voltage noise: 35nV√Hz (1KHz)
- Module protection: none (no reverse connection protection or limited current protection)
- PCB size: 96*64*42mm (LxWxH)
- Module heating: with heat sink (forced air cooling is required at high current)
- Module heating factors: the input and output voltage is too large or the module is damaged
- Module working temperature: -40℃ to 75℃(industrial grade)
- Module features: positive and negative power supply LED indication
- Application range: small signal amplification, audio signal amplifier, motor drive, servo amplifier, etc.
- Module interface type: SMA signal signal input and output, 5.08 blue power card wire holder

Package Included:
- 1 x OPA548 Board

Note:
- Other items pictured are not included in the package, for demonstration purposes only. Thank you for your understanding!

Precautions:
(1) The power consumption of the module is large, and your power supply needs to have a certain margin. It is recommended to use a power supply with a current drive capacity greater than twice the output current. The module can only be powered by dual power supplies.
(2) In order to avoid unnecessary interference, it is recommended to use a linear power supply, the power supply should not exceed ±35V.
(3) It is recommended to use a SMA to BNC cable for output signal to observe the effect directly with an oscilloscope. Poor contact or inferior cable may cause signal attenuation or excessive noise.
(4) SMA port is not for power output, and a blue terminal block must be used. The SMA port is for observing signals and cannot pass power.
(5) Due to large power consumption and heat generation, please pay attention to ventilation and heat dissipation for long-term work, and add fans to strengthen heat dissipation if necessary.
(6) Since the module has a fixed magnification and no external protection circuit, it is recommended to confirm output power and amplitude before working with a load to avoid damage to the module.

FAQ:
Q1: Is the magnification fixed? How to adjust?
A1: The default magnification of the module is 33 times. If you need to adjust the magnification, you can only replace the resistor on the board. The original resistance is 0805. The calculation formula is given in the parameter details.

Q2: Can the module directly drive a coil?
A2: The module can drive the coil, but the internal resistance of the coil is required to be greater than 4 ohms. If the internal resistance of the coil is less than 4 ohms, a power resistor must be connected in series, otherwise the module may be damaged.

Q3: Can the module amplify square wave or pulse? What is the module bandwidth?
A3: The module can amplify low-frequency square waves or pulses. Because it is an audio amplifier, the total bandwidth is not high. Signals within 100K can be amplified. The module is compatible with DC input.

Q4: Can the module be enlarged 1: 1? That is, only current can be amplified?
A4: The module can support 1: 1 amplification. You need to modify the resistance configuration magnification yourself. It is not recommended to directly configure the op amp follow mode, which is easy to self-excitation. It is recommended to change to resistance attenuation first, and then operation amplification. The total gain is 1.

Q5: Why is the input signal a sine wave and the output signal a square wave? What is the output current? What is the output power?
A5: Generally speaking, if the input signal is too large, the operational amplifier will be amplified with cut-off distortion, which is a square wave, or the power supply voltage is not enough. Reducing the input signal and increasing the supply voltage to solve this problem. The output current of the module is determined by the output voltage and load. I=U out/R. Similarly, the output power P=U*1 is determined by the output voltage and load resistance. Heat-dissipating silicone grease and air cooling can be added for high-power input.

Q6: Can I use the second level directly instead of the first level?
A6: You can use the second stage directly, but you need to remove the chip of the first stage, and then input signals from OUT1. Otherwise, the first-level chip will affect signal input.