Class A/B, 15A, 100V Power Amplifier
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Power Operational Amplifier FEATURES • LOW THERMAL RESISTANCE — 1.4°C/W • CURRENT FOLDOVER PROTECTION — NEW • HIGH TEMPERATURE VERSION — PA12H • EXCELLENT LINEARITY — Class A/B Output • WIDE SUPPLY RANGE — ±10V to ±50V • HIGH OUTPUT CURRENT — Up to ±15A Peak APPLICATIONS POWER RATING • MOTOR, VALVE AND ACTUATOR CONTROL • MAGNETIC DEFLECTION CIRCUITS UP TO 10A • POWER TRANSDUCERS UP TO 100kHz • TEMPERATURE CONTROL UP TO 360W • PROGRAMMABLE POWER SUPPLIES UP TO 90V • AUDIO AMPLIFIERS UP TO 120W RMS DESCRIPTION The PA12 is a state of the art high voltage, very high output current operational amplifier designed to drive resistive, inductive and capacitive loads. For optimum linearity, especially at low levels, the output stage is biased for class A/B operation using a thermistor compensated base-emitter voltage multiplier circuit. The safe operating area (SOA) can be observed for all operating conditions by selection of user programmable current limiting resistors. For continuous operation under load, a heatsink of proper rating is recommended. The PA12 is not recommended for gains below –3 (inverting) or +4 (non-inverting). This hybrid integrated circuit utilizes thick film (cermet) 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 8-pin TO-3 package is hermetically sealed and electrically isolated. The use of compressible isolation washers voids the warranty. Not all vendors use the same method to rate the power handling capability of a Power Op Amp. Apex Microtechnology rates the internal dissipation, which is consistent with rating methods used by transistor manufacturers and gives conservative results. Rating delivered power is highly application dependent and therefore can be misleading. For example, the 125W internal dissipation rating of the PA12 could be expressed as an output rating of 250W for audio (sine wave) or as 440W if using a single ended DC load. Please note that all vendors rate maximum power using an infinite heatsink. THERMAL STABILITY Apex Microtechnology has eliminated the tendency of class A/B output stages toward thermal runaway and thus has vastly increased amplifier reliability. This feature, not found in most other Power Op Amps, was pioneered by Apex Microtechnology in 1981 using thermistors which assure a negative temperature coefficient in the quiescent current. The reliability benefits of this added circuitry far outweigh the slight increase in component count. EQUIVALENT SCHEMATIC Copyright © Apex Microtechnology, Inc. 2012 (All Rights Reserved)

PA12 • PA12A ABSOLUTE MAXIMUM RATINGS SUPPLY VOLTAGE, +Vs to –Vs OUTPUT CURRENT, within SOA POWER DISSIPATION, internal INPUT VOLTAGE, differential INPUT VOLTAGE, common mode TEMPERATURE, pin solder -10s TEMPERATURE, junction1 TEMPERATURE RANGE, storage OPERATING TEMPERATURE RANGE, case INPUT OFFSET VOLTAGE, initial OFFSET VOLTAGE, vs. temperature OFFSET VOLTAGE, vs. supply OFFSET VOLTAGE, vs. power BIAS CURRENT, initial BIAS CURRENT, vs. temperature BIAS CURRENT, vs. supply OFFSET CURRENT, initial OFFSET CURRENT, vs. temperature INPUT IMPEDANCE, DC INPUT CAPACITANCE COMMON MODE VOLTAGE...

POWER DERATING COMMON MODE REJECTION OUTPUT VOLTAGE, VO (V) HARMONIC DISTORTION QUIESCENT CURRENT INPUT NOISE PULSE RESPONSE INPUT NOISE VOLTAGE, VN (nV/√Hz) COMMON MODE REJECTION, CMR (dB) POWER RESPONSE PHASE RESPONSE SMALL SIGNAL RESPONSE OPEN LOOP GAIN, A (dB) CURRENT LIMIT CURRENT LIMIT, ILIM (A) BIAS CURRENT VOLTAGE DROP FROM SUPPLY (V) NORMALIZED BIAS CURRENT, IB (X) INTERNAL POWER DISSIPATION, P (W) OUTPUT VOLTAGE SWING

PA12 • PA12A GENERAL Please read Application Note 1 "General Operating Considerations" which covers stability, supplies, heat sinking, mounting, current limit, SOA interpretation, and specification interpretation. Visit www.apexanalog.com for design tools that help automate tasks such as calculations for stability, internal power dissipation, current limit; heat sink selection; Apex Microtechnology’s complete Application Notes library; Technical Seminar Workbook; and Evaluation Kits. SAFE OPERATING AREA (SOA) OUTPUT CURRENT FROM +VS OR -VS (A) The output stage of most power amplifiers has...

NEED TECHNICAL HELP? CONTACT APEX SUPPORT! For all Apex Microtechnology product questions and inquiries, call toll free 800-546-2739 in North America. For inquiries via email, please contact apex.support@apexanalog.com. International customers can also request support by contacting their local Apex Microtechnology Sales Representative. To find the one nearest to you, go to www.apexanalog.com IMPORTANT NOTICE Apex Microtechnology, Inc. has made every effort to insure the accuracy of the content contained in this document. However, the information is subject to change without notice and is...