PA88 Apex Microtechnology

PA88 PA88A RoHS High Voltage Power Operational Amplifiers COMPLIANT FEATURES High Voltage 450V (225V) Low Quiescent Current 2mA Output Current 100mA Programmable Current Limit Low Bias Current FET Input APPLICATIONS Piezoelectric Positioning High Voltage Instrumentation Electrostatic Transducers Programmable Power Supplies up to 440V DESCRIPTION The PA88 is a high voltage, low quiescent current MOSFET operational amplifier designed for output cur rents up to 100mA. Output voltages can swing up to 215V with a dual supply and up to +440 volts with a sin gle supply. The safe operating area (SOA) has no second breakdown limitations 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. All internal biasing is referenced to a bootstrapped zenerMOSFET current source. As a result, the PA88 features an unprecedented supply range and excellent supply rejection. The MOSFET output stage is biased on for linear operation. External compensation provides user flexibility. This hybrid circuit utilizes beryllia (BeO) substrates, thick film resistors, ceramic capacitors and semicon ductor chips to maximize reliability, minimize size and give top performance. Ultrasonically bonded alumi num wires provide reliable interconnections at all operating temperatures. The 8pin TO3 package is hermetically sealed and electrically isolated. The use of compressible thermal isolation washers and/or improper mounting torque will void the product warranty. Please see Application Note 1, General Operating Considerations. Apex Microtechnology Inc. Aug 2017 www.apexanalog.com All rights reserved PA88U Rev SPA88 PA88A TYPICAL CONNECTION Figure 1: Typical Connection 2 PA88U Rev S