Low Cost, 1.1MHz, 2.5A, 40V Power Amplifier in 3 Package Styles
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Dual Power Operational Amplifiers FEATURES • RoHS COMPLIANT • LOW COST • WIDE BANDWIDTH - 1.1 Mhz • HIGH OUTPUT CURRENT - 2.5A (Combined) • WIDE COMMON MODE RANGE Includes negative supply • WIDE SUPPLY VOLTAGE RANGE Single supply: 5V to 40V Split supplies: ± 2.5V to ± 20V • LOW QUIESCIENT CURRENT • VERY LOW DISTORTION APPLICATIONS • HALF AND FULL BRIDGE MOTOR DRIVERS • AUDIO POWER AMPLIFIER • IDEAL FOR SINGLE SUPPLY SYSTEMS 5V Peripherals, 12V Automotive, 28V Avionic PACKAGING OPTIONS 7 PIN DDPAK PACKAGE STYLE CC 7 PIN TO220 STAGGERED LEADS PACKAGE STYLE CX TYPICAL APPLICATION Ref: APPLICATION NOTES 8, 20, 26 RI • 7 TO-220 Plastic Package (PA75CD) • 7 TO-220 with Staggered Lead Form (PA75CX) • 7 DDPAK Surface Mount Package (PA75CC) EQUIVALENT SCHEMATIC ONE CHANNEL PARALLEL CONNECTION yields a single 2.5A amplifier The amplifier design consists of dual power op amp on a single monolithic die. Side B of the dual monolithic is configured as a unity gain buffer to increase the current capability of the master side A. The use of two PA75 amplifiers provides a cost-effective solution to applications where multiple amplifiers are required or a bridge configuration is needed. Very low harmonic distortion of .02% THD and low IQ makes the PA75 a good solution for power audio applications. The PA75 is available in three standard package designs. The surface mount version of the PA75, the PA75CC, is an industry standard non-hermetic plastic 7-pin DDPAK. The through hole version of the PA75, the PA75CD and PA75CX, are industry standard non-hermetic plastic 7-pin TO-220 packages. The PA75CX is staggered lead formed and offers standard 100 mil spacing. This allows for easier PC board layout. (Please refer to the CX lead form package drawing for dimension of the PA75CX). The monolithic amplifier is directly attached to the metal tabs of the PA75CC, PA75CD, and PA75CX. The metal tabs of the packages are directly tied to -Vs. Combining the power op amp (master channel A) and the unity gain buffer (slave channel B) in a parallel connection yields a single 2.5A amplifier. RI and RF can set up channel A for the required gain for the overall circuit. Small values of RS (sense resistors) are used on the outputs to improve current sharing characteristics.The master amplifier can be configured in inverting or non-inverting gain configurations. EXTERNAL CONNECTIONS Copyright © Apex Microtechnology, Inc. 2012 (All Rights Reserved)

PA75 ABSOLUTE MAXIMUM RATINGS SUPPLY VOLTAGE, total OUTPUT CURRENT POWER DISSIPATION, internal, (per amplifier) POWER DISSIPATION, internal (both amplifiers) INPUT VOLTAGE, differential INPUT VOLTAGE, common mode JUNCTION TEMPERATURE, max1 TEMPERATURE, pin solder—10 sec max TEMPERATURE RANGE, storage OPERATING TEMPERATURE RANGE, case SPECIFICATIONS PARAMETER INPUT OFFSET VOLTAGE, initial OFFSET VOLTAGE, vs. temperature BIAS CURRENT, initial COMMON MODE RANGE COMMON MODE REJECTION, DC POWER SUPPLY REJECTION CHANNEL SEPARATION INPUT NOISE VOLTAGE GAIN OPEN LOOP GAIN GAIN BANDWIDTH PRODUCT...

PA75 TYPICAL PERFORMANCE GRAPHS PHASE MARGIN vs. OUTPUT LOAD CAPACITANCE PULSE RESPONSE OFFSET VOLTAGE OUTPUT VOLTAGE SWING PULSE RESPONSE VOLTAGE GAIN & PHASE vs. FREQUENCY NORMALIZED OFFSET VOLTAGE, VOS (mV) VOLTAGE DROP FROM SUPPLY, (V) TOTAL SUPPLY VOLTAGE, VS (V) BIAS CURRENT NORMALIZED BIAS CURRENT, IB (mA) QUIESCENT CURRENT

THERMAL CONSIDERATIONS Please read Application Note 1 “General Operating Considerations” which covers stability, supplies, heatsinking, mounting, SOA interpretation, and specification interpretation. Visit www. apexanalog.com for design tools that help automate tasks such as calculations for stability, internal power dissipation, heatsink selection; Apex Microtechnology’s complete Application Notes library; Technical Seminar Workbook; and Evaluation Kits. The PA75CD and CX have a large exposed copper heat tab to which the monolithic is directly attached. The PA75CD and CX may require a...

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