PA89A Apex Microtechnology

PA89 PA89A RoHS High Voltage Power Operational Amplifiers COMPLIANT FEATURES 1140V P-P Signal Output Wide Supply Range 75V to 600V Programmable Current Limit 75 mA Continuous Output Current Hermetically Sealed Package Input Protection APPLICATIONS Piezoelectric Positioning High Voltage Instrumentation Electrostatic Deflection Semiconductor Testing DESCRIPTION The PA89 is an ultra high voltage, MOSFET operational amplifier designed for output currents up to 75 mA. Output voltages can swing over 1000V p-p. The safe operating area (SOA) has no second breakdown lim- itations and can be observed with all types of loads by choosing an appropriate current limiting resistor. High accuracy is achieved with a cascode input circuit configuration and 120dB open loop gain. All internal biasing is referenced to a bootstrapped zener-MOSFET current source, giving the PA89 a wide supply range and excellent supply rejection. The MOSFET output stage is biased for class A/B linear operation. External com- pensation provides user flexibility. The PA89 hermetic seal is 100% tested to the requirements of MIL-STD- 883 method 1014 for fine and gross leak. This hybrid integrated circuit utilizes a Beryllia (BeO) substrate, thick film resistors, ceramic capacitors and semiconductor chips to maximize reliability, minimize size and give top performance. Ultrasonically bonded aluminum wires provide reliable interconnections at all operating temperatures. The MO-127 High Voltage, Power Dip package is hermetically sealed and electrically isolated. The use of compressible ther- mal washers will void the product warranty. Apex Microtechnology Inc. Aug 2021 www.apexanalog.com All rights reserved PA89U Rev PPA89 PA89A EQUIVALENT SCHEMATIC Figure 1: Equivalent Schematic 8 +V S D1 Q3 Q19 Q1 Q2 D57 Q20 COMP C L 9 10 Q26 7 Q22 Q23 IN +IN Q25A Q25B 1 2 Q29 6 OUT Q36 D34 D30 D31 D35 Q42 Q44 Q45 D5 V S 5 2 PA89U Rev P