Description:The PA84 is a 300V power operational amplifier designed for output voltage swings up to ±145V with dual supplies, or 290V single supply. Two additional versions are available. The PA84S is a fast settling version that can absorb differential input over voltages up to 100V. The base model PA84 and A grade version PA84A can handle differential input over voltages of up to 600V. Target applications include high voltage instrumentation, electrostatic transducers and deflection, and programmable power supplies.
Apex Microtechnology recommends a 4-layer PCB with a thermal plane on the bottom layer, and a heat sink attached to the top of the device. A minimum of 2 oz copper thickness is recommended for the thermal plane. Additionally, a thermal interface material (TIM) with a thermal conductivity of at least 1 W/m-K should be used between the device and the heat sink.
To ensure reliable operation over the full temperature range, it is essential to follow the recommended operating conditions, including voltage, current, and power dissipation. Additionally, the device should be operated within the specified temperature range, and the PCB should be designed to minimize thermal gradients and hotspots.
Apex Microtechnology recommends using a soldering temperature of 260°C (500°F) for a maximum of 10 seconds. The device should be handled by the package, not the leads, to prevent damage. A no-clean or low-residue soldering process is recommended to prevent contamination and ensure reliable operation.
Common issues with the PA84M/883 can often be attributed to improper PCB layout, inadequate thermal management, or incorrect component selection. To troubleshoot, check the PCB layout for proper decoupling, ensure the device is properly heat-sinked, and verify that the input and output impedances are matched. Additionally, check for oscillation or instability by monitoring the output waveform and adjusting the feedback network as necessary.
The PA84M/883 is designed to meet the requirements of MIL-PRF-38534 for radiation hardness, and is suitable for use in aerospace and defense applications. Additionally, the device is designed to meet the EMC requirements of MIL-STD-461, and is suitable for use in applications requiring high electromagnetic compatibility.
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PA84M/883 Overview
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