PA89PA89 • PA89A • PA89A P r o d u c t IPA89A Innnnoovvaa t i o n FFr roomm PA89, High Voltage Power Operational Amplifiers FEATURES • 1140V P-P SIGNAL OUTPUT • WIDE SUPPLY RANGE — ±75V to ±600V • Programmable CURRENT LIMIT • 75 mA CONTINUOUS OUTPUT CURRENT • HERMETIC SEALED PACKAGE • INPUT PROTECTION PATENTED APPLICATIONS • PIEZOELECTRIC POSITIONING • HIGH VOLTAGE INSTRUMENTATION • ELECTROSTATIC DEFLECTION • SEMICONDUCTOR TESTING TYPICAL APPLICATION Ultra-high voltage capability combined with the bridge amplifier configuration makes it possible to develop +/–1000 volt peak swings across a piezo element. A high gain of –50 for A1 insures stability with the capacitive load, while “noise-gain” compensation Rn and Cn on A2 insure the stability of A2 by operating in a noise gain of 50. 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 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 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 compensation provides user flexibility. The PA89 is 100% gross leak tested to military standards for long term reliability. 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 thermal washers will void the product warranty. 50R +600V D1 Q2 COMP 9 10 –IN 1 Q22 Q23 Q25A Q25B Q26 Q29 D34 D35 D31 –600V EXTERNAL CONNECTIONS –IN +IN PA89U http://www.cirrus.com RESERVED 1 12 2 11 N/C 3 N/C 4 –VS TOP VIEW 10 8 6 7 –VS 5 +VS COMP RC CL R CL = 7 6 OUT RESERVED CC COMP 9 5 CL .7 I LIM R CL PHASE COMPENSATION Gain 1 10 15 100 Q44 D5 –600V SINGLE AXIS MICRO-POSITIONING Q42 Q45 Cn PIEZO TRANSDUCER +IN 2 A2 PA89 OUT Q20 Q36 D30 R A1 PA89 V IN Q19 D57 +600V R 8 +VS Q3 50R 50R SIMPLIFIED SCHEMATIC Q1 High Voltage MO-127 PACKAGE STYLE DC CC 470pF 68pF 33pF 15pF RC 470Ω 220Ω 220Ω 220Ω Note: CC must be rated for full supply voltage –Vs to +Vs. See details under “EXTERNAL COMPONENTS”. Copyright © Cirrus Logic, Inc. 2009 (All Rights Reserved) MAY 20091 APEX − PA89UREVJ PA89 • PA89A SUPPLY VOLTAGE, +VS to –VS OUTPUT CURRENT, within SOA POWER DISSIPATION, internal at TC = 25°C INPUT VOLTAGE, differential INPUT VOLTAGE, common mode TEMPERATURE, pin solder - 10s max TEMPERATURE, junction2 TEMPERATURE, storage OPERATING TEMPERATURE RANGE, case SPECIFICATIONS TEST CONDITIONS 1 MIN INPUT OFFSET VOLTAGE, initial OFFSET VOLTAGE, vs. temperature OFFSET VOLTAGE, vs. supply OFFSET VOLTAGE, vs. time BIAS CURRENT, initial3 BIAS CURRENT,vs. supply OFFSET CURRENT, initial3 INPUT IMPEDANCE, DC INPUT CAPACITANCE COMMON MODE VOLTAGE RANGE4 COMMON MODE REJECTION, DC INPUT NOISE Full temperature range Full temperature range, VCM = ±90V 10kHz BW, RS = 10K, CC = 15pF ±VS 50 96 GAIN OPEN LOOP GAIN at 10Hz GAIN BANDWIDTH PRODUCT POWER BANDWIDTH PHASE MARGIN RL = 10k, CC = 15pF RL = 10k, CC = 15pF, AV = 100 RL = 10k, CC = 15pF, VO = 500V p-p Full temperature range, AV = 10 108 OUTPUT VOLTAGE SWING4 VOLTAGE SWING4 CURRENT, continuous SLEW RATE CAPACITIVE LOAD, Av = 10 CAPACITIVE LOAD, Av>10 SETTLING TIME to .1% IO = 75mA Full temperature range, IO = 20mA Full temperature range CC = 15pF, AV = 100 Full temperature range Full temperature range RL = 10KΩ, 10V step, Av = 10 Full temperature range, F > 60Hz Full temperature range, F < 60Hz Full temperature range Meets full range specifications .5 10 7 75 5 .01 5 105 4 110 4 120 10 5 60 ±VS 45 ±VS 30 ±VS 20 ±VS 12 75 12 16 ± ± THERMAL RESISTANCE, AC, junction to case5 RESISTANCE, DC, junction to case RESISTANCE, junction to air TEMPERATURE RANGE, case Full temperature range ± POWER SUPPLY VOLTAGE, VS4 CURRENT, quiescent Full temperature range PA89 TYP ± ± PARAMETER 2 ±75 –25 ±500 4.8 2.1 3.3 15 1200V 100mA 40W ±25V ±VS 25V 300°C 150°C –65 to 125°C –55 to 125°C ± ABSOLUTE MAXIMUM RATINGS P r o d u c t I n n o v a t i o nF r o m PA89A MAX MIN TYP MAX 2 .25 .5 30 5 10 * * 50 3 10 * 50 3 20 * * * * * * UNITS mV µV/°C µV/V µV/kh pA pA/V pA MΩ pF V dB µV RMS * * * * dB MHz kHz ° * * * * * * * 1 * SOA * * V V mA V/µs nF ±600 * 6.0 V mA * * * * 2.3 * * 3.5 * * * +85 * * µs °C/W °C/W °C/W °C NOTES: * The specification of PA89A is identical to the specification for PA89 in applicable column to the left. 1. Unless otherwise noted: TC = 25°C, CC = 68pF, RC = 220Ω, and VS = ±500V. Input parameters for bias currents and offset voltage are ± values given. 2. Long term operation at the maximum junction temperature will result in reduced product life. Derate internal power dissipation to achieve high MTTF. 3. Doubles for every 10°C of temperature increase. 4. +VS and –VS denote the positive and negative supply rail respectively. 5. Rating applies only if the output current alternates between both output transistors at a rate faster than 60Hz. CAUTION 2 The PA89 is constructed from MOSFET transistors. ESD handling procedures must be observed. 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. PA89U PA89 • PA89A 16 8 68pf, 220Ω –180 15pf, 220Ω 0 25 50 75 100 125 150 CASE TEMPERATURE, TC (°C) SMALL SIGNAL RESPONSE 15pf, 220Ω 33pf, 220Ω 80 60 40 68pf, 220Ω 20 0 CC, RC 1 100 1K 10K 100K 1M 10M FREQUENCY, F (Hz) 10 1 OUTPUT VOLTAGE SWING 30 25 20 15 10 5 0 0 1 VS = ±500V CC = 15pf, RC = 220Ω RL = 11KΩ AV = 100 .1 VO = 800Vpp 80 60 40 20 0 1 PA89U 10 100 1K 10K 100K 1M 10M FREQUENCY, F (Hz) 100 VO = 600Vpp VO = 400Vpp .001 30 POWER SUPPLY REJECTION, PSR (dB) COMMON MODE REJECTION 100 100 .95 .9 VO = 100Vpp POWER SUPPLY REJECTION 60 40 20 1 10 0 100 1K 10K 100K 1M 10M FREQUENCY, F (Hz) 200 400 600 800 1000 1200 TOTAL SUPPLY VOLTAGE, VS (V) POWER RESPONSE CC = 15pf 600 500 300 CC = 33pf CC = 68pf 100 1K 100 300 1K 3K 10K 30K 100K FREQUENCY, F (Hz) 80 0 1.00 HARMONIC DISTORTION .01 0 75 25 50. 100 EXT. COMPENSATION CAPACITOR, CC (pF) 25 50 75 OUTPUT CURRENT, IO,(mA) 1.05 1200 1000 800 35 10 5 10 100 1K 10K 100K 1M 10M FREQUENCY F (Hz) 40 SLEW RATE VS COMP 15 CC, RC 45 DISTORTION, THD (%) 20 10 –270 OUTPUT VOLTAGE, VO (VP-P) 0 QUIESCENT CURRENT 1.10 RC = 220Ω 3K 30K 10K FREQUENCY, F (Hz) 100K INPUT NOISE VOLTAGE 20 15 10 7 5 3 2 10 100 10K 1K FREQUENCY, F (Hz) 100K CURRENT LIMIT 100 CURRENT LIMIT, ILIM (mA) OPEN LOOP GAIN, A (dB) –135 –225 100 SLEW RATE, (V/ μS) –90 NORMALIZED QUIESCENT CURRENT, IQ (X) PHASE, Ф (°) 24 120 COMMON MODE REJECTION, CMR (dB) 33pf, 220Ω –45 32 –20 PHASE RESPONSE 0 INPUT NOISE VOLTAGE, eN (nV/√Hz) POWER DERATING 40 VOLTAGE DROP FROM SUPPLY, VS-VO (V) OUTPUT STAGE INTERNAL POWER DISSIPATION, P(W) P r o d u c t I n n o v a t i o nF r o m 80 60 40 20 0 0 20 80 40 60 RESISTOR VALUE, RCL (Ω) 100 3 PA89 • PA89A P r o d u c t I n n o v a t i o nF r o m 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.Cirrus.com for design tools that help automate tasks such as calculations for stability, internal power dissipation, current limit; heat sink selection; Apex Precision Power’s complete Application Notes library; Technical Seminar Workbook; and Evaluation Kits. STABILITY Although the PA89 can be operated at unity gain, maximum slew rate and bandwidth performance was designed to be obtained at gains of 10 or more. Use the small signal response and phase response graphs as a guide. In applications where gains of less than 10 are required, use noise gain compensation to increase the phase margin of the application circuit as illustrated in the typical application drawing. SAFE OPERATING AREA (SOA) OUTPUT CURRENT FROM +VS OR –VS (mA) The MOSFET output stage of this power operational amplifier has two distinct limitations: 1. The current handling capability of the MOSFET geometry and the wire bonds. 2. The junction temperature of the output MOSFETs. NOTE: The output stage is protected against transient flyback. However, for protection against sustained, high energy flyback, external fast-recovery diodes should be used. 100 SOA 10mS 25°C 50 100mS 30 15 125°C full supply voltage range. For example, with supply voltages of ±500V the possible voltage swing across CC is 1000V. In addition, a voltage coefficient less than 100PPM is recommended to maintain the capacitance variation to less than 5% for this example. It is strongly recommended to use the highest quality capacitor possible rated at least twice the total supply voltage range. Of equal importance are the voltage rating and voltage coefficient of the gain setting resistances. Typical voltage ratings of low wattage resistors are 150 to 250V. In the above example 1000V could appear across the feedback resistor. This would require several resistors in series to obtain the proper voltage rating. Low voltage coefficient resistors will insure good gain linearity. The wattage rating of the feedback resistor is also of concern. A 1 megohm feedback resistor could easily develop 1 watt of power dissipation. Though high voltage rated resistors can be obtained, a 1 megohm feedback resistor comprised of five 200Kohm, 1/4 watt metal film resistors in series will produce the proper voltage rating, voltage coefficient and wattage rating. CURRENT LIMIT For proper operation the current limit resistor (RCL) must be connected as shown in the external connection diagram. The minimum value is 3.5 ohm, however for optimum reliability the resistor value should be set as high as possible. The value is calculated as follows with the maximum practical value of 150 ohms. .7 RCL = ILIM When setting the value for RCL allow for the load current as well as the current in the feedback resistor. Also allow for the temperature coefficient of the current limit which is approximately -0.3% /°C of case temperature rise. CAUTIONS 85°C 10 5 T = TCASE 3 200 100 300 500 800 1000 1200 SUPPLY TO OUTPUT DIFFERENTIAL VOLTAGE, VS – VO (V) SAFE OPERATING CURVES The safe operating area curves define the maximum additional internal power dissipation the amplifier can tolerate when it produces the necessary output to drive an external load. This is not the same as the absolute maximum internal power dissipation listed elsewhere in the specification since the quiescent power dissipation is significant compared to the total. EXTERNAL COMPONENTS The operating voltages of the PA89 are potentially lethal. During circuit design, develop a functioning circuit at the lowest possible voltages. Clip test leads should be used for “hands off” measurements while troubleshooting. POWER SUPPLY PROTECTION Unidirectional zener diode transient absorbers are recommended as protection on the supply pins. The zeners clamp transients to voltages within the power supply rating and also clamp power supply reversals to ground. Whether the zeners are used or not, the system power supply should be evaluated for transient performance including power-on overshoot and power-off polarity reversals as well as line regulation. Conditions which can cause open circuits or polarity reversals on either power supply rail should be avoided or protected against. Reversals or opens on the negative supply rail is known to induce input stage failure. Unidirectional transzorbs prevent this, and it is desirable that they be both electrically and physically as close to the amplifier as possible. The very high operating voltages of the PA89 demand consideration of two component specifications rarely of concern in building op amp circuits: voltage rating and voltage coefficient. The compensation capacitance CC must be rated for the 4 PA89U P r o d u c t I n n o v a t i o nF r o m PA89 • PA89A Contacting Cirrus Logic Support For all Apex Precision Power product questions and inquiries, call toll free 800-546-2739 in North America. For inquiries via email, please contact [email protected]. International customers can also request support by contacting their local Cirrus Logic Sales Representative. To find the one nearest to you, go to www.cirrus.com IMPORTANT NOTICE Cirrus Logic, Inc. and its subsidiaries ("Cirrus") believe that the information contained in this document is accurate and reliable. However, the information is subject to change without notice and is provided "AS IS" without warranty of any kind (express or implied). Customers are advised to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those pertaining to warranty, indemnification, and limitation of liability. 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