PA83M/883 Apex Microtechnology

PA83 PA83A RoHS High Voltage Power Operational Amplifiers COMPLIANT FEATURES Low Bias Current, Low Noise FET Input Fully Protected Input Up to 150V Wide Supply Range 15V to 150V APPLICATIONS High Voltage Instrumentation Electrostatic Transducers & Deflection Programmable Power Supplies up to 290V Analog Simulators DESCRIPTION The PA83 is a high voltage operational amplifier designed for output voltage swings up to 145V with a dual () supply or 290V with a single supply. Its input stage is protected against transient and steady state overvoltages up to and including the supply rails. High accuracy is achieved with a cascode input circuit con figuration. All internal biasing is referenced to a zener diode fed by a FET constant current source. As a result, the PA83 features an unprecedented supply range and excellent supply rejection. The output stage is biased in the class A/B mode for linear operation. Internal phase compensation assures stability at all gain settings without need for external components. Fixed current limits protect these amplifiers against shorts to com mon at supply voltages up to 120V. For operation into inductive loads, two external flyback pulse protection diodes are recommended. However, a heatsink may be necessary to maintain the proper case temperature under normal operating conditions. This hybrid circuit utilizes beryllia (BeO) substrates, thick (cermet) film resistors, ceramic capacitors and silicon semiconductor chips to maximize reliability, minimize size and give top performance. Ultrasonically bonded aluminum wires provide reliable interconnections at all operating temperatures. The 8 pin TO 3 package is hermetically sealed and electrically isolated. The use of compressible thermal isolation washers and/or improper mounting torque voids product warranty. Please see Application Note 1 General Operating Considerations. Figure 1: Equivalent Schematic 4 2 C1 D1 3 Q3 Q1 Q2 Q4 Q5 C3 C2 Q6 Q8 Q9 Q7 Q10 C5 Q11 C4 Q12B 1 Q12A 5 Q13 Q14 Q17 Q16 6 Q15 D2 C6 7 Apex Microtechnology Inc. Dec 2015 www.apexanalog.com All rights reserved PA83U Rev YPA83 PA83A TYPICAL CONNECTION Figure 2: Typical Connection 2 PA83U Rev Y