Description:900V, 1.6mA Power Amplifier with Low Standby Current, High voltage – 900V (±450V), Low quiescent current – 1.6mA, High output current – 100mA continuous, 200mA PEAK.
Apex Microtechnology recommends a 4-layer PCB with a solid ground plane, and a separate power plane for the amplifier. The input and output traces should be kept short and away from each other to minimize coupling.
Apex recommends using a voltage regulator to limit the input voltage to 15V or less, and a current limiter or fuse to prevent overcurrent. Additionally, a transient voltage suppressor (TVS) can be used to protect against voltage spikes.
Apex provides a thermal derating curve in the application note, which shows the maximum power dissipation vs. temperature. The curve indicates that the device can operate up to 150°C, but the power dissipation must be reduced to prevent overheating.
Yes, the PA95 can be used in a push-pull configuration to achieve higher output power and improved linearity. However, Apex recommends using a matched pair of devices and a balanced input stage to ensure optimal performance.
Apex recommends a heatsink with a thermal resistance of 1°C/W or less, and a surface finish that ensures good thermal contact with the device. A heatsink with a thermal interface material (TIM) can also be used to improve thermal performance.
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PA95 Overview
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