PA61

PA61 • PA61A Power Operational Amplifiers RoHS COMPLIANT FEATURES • • • • Wide Supply Range — ±10 to ±45V High Output Current — ±10A Peak Low Cost — Class “C” Output Stage Low Quiescent Current — 3mA APPLICATIONS • • • • • Programmable Power Supply Motor/Syncro Driver Valve And Actuator Control DC or AC Power Regulator Fixed Frequency Power Oscillator DESCRIPTION The PA61 and PA61A are high output current operational amplifiers designed to drive resistive, inductive and capacitive loads. Their complementary emitter follower output stage is the simple class C type and opti‐ mized for low frequency applications where crossover distortion is not critical. These amplifiers are not rec‐ ommended for audio, transducer or deflection coil drive circuits above 1 kHz or when distortion is critical. The safe operating area (SOA) is fully specified and can be observed for all operating conditions by selection of user programmable current limiting resistors. Both amplifiers are internally compensated for all gain set‐ tings. For continuous operation under load, mounting on a heatsink of proper rating is recommended. This hybrid circuit utilizes thick film conductors, ceramic capacitors, and semiconductor chips to maxi‐ mize reliability, minimize size, and give top performance. Ultrasonically bonded aluminum wires provide reli‐ able interconnections at all operating temperatures. The 8‐pin TO‐3 package is electrically isolated and hermetically sealed. The use of compressible thermal washers and/or improper mounting torque voids the product warranty. Please see Application Note 1, “General Operating Considerations”. Figure 1: Equivalent Schematic 3 Q1A Q1B 2 Q3 4 A1 1 5 Q4 8 C1 Q6B Q6A 6 www.apexanalog.com © Apex Microtechnology Inc. All rights reserved Dec 2015 PA61U Rev P PA61 • PA61A TYPICAL CONNECTION Figure 2: Typical Connection 2 PA61U Rev P PA61 • PA61A PINOUT AND DESCRIPTION TABLE Figure 3: External Connections Pin Number Name Description 1 OUT The output. Connect this pin to load and to the feedback resistors. 2 +CL Connect to the sourcing current limit resistor. Output current flows into/out of this pin through RCL+. The output pin and the load are connected to the other side of RCL+. 3 ‐Vs The positive supply rail. 4 +IN The non‐inverting input. 5 ‐IN The inverting input. 6 ‐Vs The negative supply rail. 7 NC No connection. 8 ‐CL Connect to the sinking current limit resistor. Output current flows into/out of this pin through RCL‐. The output pin and the load are connected to the other side of RCL‐ . PA61U Rev P 3 PA61 • PA61A SPECIFICATIONS The power supply voltage for all specifications is the TYP rating unless noted as a test condition. ABSOLUTE MAXIMUM RATINGS Parameter Max Units +Vs to ‐Vs 90 V Output Current, within SOA IO 10 A Power Dissipation, internal PD 97 W Input Voltage, differential VIN (Diff) ±37 V Vcm ±VS V 350 °C 200 °C ‐65 +150 °C ‐55 +125 °C Supply Voltage, total Input Voltage, common mode Symbol Min Temperature, pin solder, 10s max. Temperature, junction 1 TJ Temperature Range, storage Operating Temperature Range, case TC 1. Long term operation at the maximum junction temperature will result in reduced product life. Derate internal power dis‐ sipation to achieve high MTTF. CAUTION 4 The internal substrate contains beryllia (BeO). Do not break the seal. If accidentally broken, do not crush, machine, or subject to temperatures in excess of 850°C to avoid generating toxic fumes. PA61U Rev P PA61 • PA61A INPUT Parameter Test Conditions PA61 Min PA61A Typ Max Min Typ Max Units Offset Voltage, initial TC = 25°C ±2 ±6 ±1 ±4 mV Offset Voltage vs. Temperature Specified temp range ±10 ±65 * ±40 µV/°C Offset Voltage vs. Supply TC = 25°C ±30 ±200 * * µV/V Offset Voltage vs. Power TC = 25°C ±20 Bias Current, initial TC = 25°C 12 30 10 20 nA Bias Current vs. Temperature Specified temp range ±50 ±500 * * pA/°C Bias Current vs. Supply TC = 25°C ±10 Offset Current, initial TC = 25°C ±12 Offset Current vs. Temperature Specified temp range ±50 * pA/°C Input Impedance, DC TC = 25°C 200 * MΩ Input Capacitance TC = 25°C 3 * pF Common Mode Voltage Range 1 Specified temp range * * V Common Mode Rejection, DC 1 Specified temp range * * dB * * ±30 ±VS – 5 ±VS – 3 74 µV/W 100 ±5 pA/V ±10 nA 1. +VS and –VS denote the positive and negative supply rail respectively. Total VS is measured from +VS to –VS. GAIN Parameter Test Conditions Open Loop @ 10 Hz Full temp range, full load Gain Bandwidth Product @ 1 MHz TC = 25°C, full load Power Bandwidth TC = 25°C, IO = 8A, VO = 40VPP Phase Margin Full temp range PA61U Rev P PA61 Min Typ 96 108 PA61A Max Typ * * dB * MHz * kHz * ° 1 10 16 45 * Max Units Min 5 PA61 • PA61A OUTPUT Parameter Test Conditions PA61 Min Typ PA61A Max Min Typ Max Units Voltage Swing 1 TC=25°C, IO=10A ±VS–7 ±VS–5 ±VS–6 * V Voltage Swing 1 Full temp range, IO = 4A ±VS–6 ±VS–4 * * V Voltage Swing 1 Full temp range, IO = 68mA ±VS–5 * V Current TC = 25°C ±10 * A Settling Time to 0.1% TC=25°C, 2V step Slew Rate TC=25°C, RL=6 Ω Capacitive Load, unit gain Full temp range 1.5 * Capacitive Load, gain > 4 Full temp range SOA * 2 1.0 2.8 * * µs * V/µs nF 1. +VS and –VS denote the positive and negative supply rail respectively. Total VS is measured from +VS to –VS. POWER SUPPLY PA61 PA61A Test Conditions Min Typ Max Min Typ Max Voltage Full temp range ±10 ±32 ±45 * * * V Current, quiescent TC = 25°C 3 10 * * mA Parameter Units THERMAL Parameter Test Conditions PA61 Min PA61A Typ Max Min Typ Max Units Resistance, AC, junction to case 1 F > 60 Hz 1.0 1.2 * * °C/W Resistance, DC, junction to case F < 60 Hz 1.5 1.8 * * °C/W Resistance, junction to air Temperature Range, case 30 Meets full range specs ‐25 25 * +85 * * °C/W * °C 1. Rating applies if the output current alternates between both output transistors at a rate faster than 60 Hz. Note: * The specification of PA61A is identical to the specification for PA61 in applicable column to the left. 6 PA61U Rev P PA61 • PA61A TYPICAL PERFORMANCE GRAPHS Figure 4: Power Derating Figure 5: Output Voltage Swing 5.5 Voltage Drop From Supply (V) /ŶƚĞƌŶĂůWŽǁĞƌŝƐƐŝƉĂƟŽŶ͕W;t) 100 T = TC 80 60 40 20 25 50 75 100 125 4.5 150 3.5 3.0 2 100 -30 80 -60 Phase, Ɍ(°) Open Loop Gain, AOL (dB) 0 60 40 0 -180 Frequency, F (Hz) PA61U Rev P 10 -120 -150 10k .1M 8 -90 20 1k 6 Figure 7: Phase Response 120 100 4 Output Current, IO (A) Figure 6: Small Signal Response 10 5°C to 8 25 = TC Temperature, TC (°C) -20 1 C 25° – T C= 4.0 2.5 0 0 0 5.0 1M 10M -210 1 10 100 1k 10k .1M 1M 10M Frequency, F (Hz) 7 PA61 • PA61A Figure 8: Current Limit Figure 9: Power Response 7 80 6 58 Output Voltage, VO (VP-P) Current Limit, ILIM (A) VS = ±40V R с CL Ϭ ͘ϭϮ ɏ 5 4 3 RCL сϬ͘ϯɏ 2 1 41 RLсϴɏ 30 21 15 RLсϯɏ 11 0 -25 0 25 50 75 100 8 10k 125 20k Figure 10: Pulse Response .1M 120 ŽŵŵŽŶDŽĚĞZĞũĞĐƟŽŶ͕DZ;ĚͿ Output Voltage VO (V) 70k Figure 11: Common Mode Rejection 8 RLсϱɏ AV = +1 4 2 0 -2 -4 -6 100 80 60 40 20 0 -8 0 2 4 6 8 Time, t (μs) 8 50k Frequency, F (Hz) Case Temperature, TC (°C) 6 30k 10 12 14 1 10 100 1k 10k .1M 1M Frequency, F (Hz) PA61U Rev P PA61 • PA61A Figure 12: Bias Current Figure 13: Harmonic Distortion 10 VS = ±36 RLсϰɏ 3 AV = 10 2.2 1.9 ŝƐƚŽƌƟŽŶ;%) Normalized Bias Current, IB (X) 2.5 1.6 1.3 PO =0 0.3 W =5 PO 0.1 0W 1.0 =5 PO 0.03 .7 .4 –50 –25 0 25 50 100 75 0.01 30 125 Figure 14: Quiescent Current 1k 3k 10k 30k Input Noise Voltage, V (nV/яHz) 100 1.4 1.2 T C = 125°C 1.0 T C = 25°C C 55° – T C= 0.8 0.6 30 40 50 60 70 80 Total Supply Voltage, VS (V) PA61U Rev P 300 Figure 15: Input Noise 1.6 0.4 20 100 Frequency, F (Hz) Case Temperature, TC (°C) Normalized Quiescent Current, IQ (X) .1W 1 90 70 50 40 30 20 10 10 100 1k 10k .1M Frequency, F (Hz) 9 PA61 • PA61A SAFE OPERATING AREA (SOA) The output stage of most power amplifiers has 3 distinct limitations: 1. The current handling capability of the transistor geometry and the wire bonds. 2. The second breakdown effect which occurs whenever the simultaneous collector current and collector‐ emitter voltage exceeds specified limits. 3. The junction temperature of the output transistors. The SOA curves combine the effect of all limits for this Power Op Amp. For a given application, the direc‐ tion and magnitude of the output current should be calculated or measured and checked against the SOA curves. This is simple for resistive loads but more complex for reactive and EMF generating loads. The follow‐ ing guidelines may save extensive analytical efforts. 1. Under transient conditions, capacitive and dynamic* inductive loads up to the following maximum are safe: Capacitive Load Inductive Load ±VS ILIM = 5A ILIM = 10A ILIM = 5A ILIM = 10A 45V 200 F 150 F 8 mH 2.8 mH 40V 400 F 200 F 11 mH 4.3 mH 35V 800 F 400 F 20 mH 5.0 mH 30V 160 F 800 F 35 mH 6.2 mH 25V 5mF 2.5mF 50 mH 15 mH 20V 10mF 5mF 400 mH 20 mH 15V 20mF 10mF ** 100 mH * If the inductive load is driven near steady state conditions, allowing the output voltage to drop more than 8V below the supply rail with ILIM = 10A or 15V below the supply rail with ILIM = 5A while the amplifier is current limiting, the inductor should be capacitively coupled or the current limit must be lowered to meet SOA criteria. ** Second breakdown effect imposes no limitation but thermal limitations must still be observed. 2. The amplifier can handle any EMF generating or reactive load and short circuits to the supply rail or shorts to common if the current limits are set as follows at TC = 85°C. * 10 ±VS Short to ±VS C, L, or EMF Load Short to Common 45V 0.1A 1.3A 40V 0.2A 1.5A 35V 0.3A 1.6A 30V 0.5A 2.0A 25V 1.2A 2.4A 20V 1.5A 3.0A 15V 2.0A 4.0A These simplified limits may be exceeded with further analysis using the operating conditions for a specific application. PA61U Rev P PA61 • PA61A 3. The output stage is protected against transient flyback. However, for protection against sustained, high energy flyback, external fast‐recovery diodes should be used. T = C 2 T = 5°C C 85° T = C C 125 °C 4.0 3.0 2.0 1.5 1.0 0.8 0.6 0.4 0.3 ms s 0.5 Ğ 1m t= ƚĂƚ s t= 5m ĂĚLJ^ ^ƚĞ 10 8.0 6.0 t= Input Current From +VS or -VS (A) Figure 16: SOA 0.2 0.1 10 15 20 25 30 40 50 60 70 80 90 ^ƵƉƉůLJƚŽKƵƚƉƵƚŝīĞƌĞŶƟĂů͕VS-VO (V) PA61U Rev P 11 PA61 • PA61A 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.apexana‐ log.com for Apex Microtechnology’s complete Application Notes library, Technical Seminar Workbook, and Evaluation Kits. TYPICAL APPLICATION Due to its high current drive capability, PA61 applications often utilize remote sensing to compensate IR drops in the wiring. The importance of remote sensing increases as accuracy requirements, output currents, and distance between amplifier and load go up. The circuit above shows wire resistance from the PA61 to the load and back to the local ground via the power return line. Without remote sensing, a 7.5A load current across only 0.05 ohm in each line would produce a 0.75V error at the load. With the addition of the second ratio matched RF/RIN pair and two low current sense wires, IR drops in the power return line become common mode voltages for which the op amp has a very high rejection ratio. Voltage drops in the output and power return wires are inside the feedback loop. Therefore, as long as the Power Op Amp has the voltage drive capability to overcome the IR losses, accuracy remains the same. Appli‐ cation Note 7 presents a general discussion of PPS circuits. Figure 17: Typical Application (Programmable Power Supply With Remote Sensing) 12 PA61U Rev P PA61 • PA61A PACKAGE OPTIONS Part Number Apex Package Style Description PA61 CE 8‐pin TO‐3 PA61A CE 8‐pin TO‐3 PACKAGE STYLE CE PA61U Rev P 13 PA61 • PA61A 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 provided "AS IS" without warranty of any kind (expressed or implied). Apex Microtechnology reserves the right to make changes without further notice to any specifications or products mentioned herein to improve reliability. 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