PA88PA88 • PA88A • PA88A P r o d u c t IPA88A Innnnoovvaa t i o n FFr roomm PA88, High Voltage Power Operational Amplifiers FEATURES • HIGH VOLTAGE — 450V (±225V) • LOW QUIESCENT CURRENT — 2mA • HIGH OUTPUT CURRENT — 100mA • PROGRAMMABLE CURRENT LIMIT • LOW BIAS CURRENT — FET Input PATENTED APPLICATIONS • PIEZOELECTRIC POSITIONING • HIGH VOLTAGE INSTRUMENTATION • ELECTROSTATIC TRANSDUCERS • PROGRAMMABLE POWER SUPPLIES UP TO 440V TYPICAL APPLICATION RF DESCRIPTION +V S The PA88 is a high voltage, low quiescent current MOSFET operational amplifier designed for output currents up to 100mA. Output voltages can swing up to ±215V with a dual supply and up to +440 volts with a single 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 zener-MOSFET 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 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 thermal isolation washers and/or improper mounting torque will void the product warranty. Please see “General Operating Considerations”. PIEZO DRIVE D1 Q2 Q4 D19 COMP 7 8 – IN 5 Q6 Q10A Q7 + IN 4 Q8 COMPUTER FOCUS COMMAND VOLTAGE –V S LOW POWER, PIEZOELECTRIC POSITIONING Piezo positioning may be applied to the focusing of segmented mirror systems. The composite mirror may be composed of hundreds of elements, each requiring focusing under computer control. In such complex systems the PA88’s advantage of low quiescent power consumption reduces the costs of power supplies and cooling, while providing the interface between the computer and the high voltage drive to the piezo positioners. EXTERNAL CONNECTIONS Q12 Q11 2 PHASE COMPENSATION 1 OUT TOP VIEW 1 OUT Q10B R CL CL 3 +IN 4 Q9 CL 2 V OUT PA88 +Vs 3 +VS CC R IN EQUIVALENT SCHEMATIC Q1 8-pin TO-3 PACKAGE STYLE CE –IN 5 8 –Vs 6 GAIN CC 1 10 20 100 68pf 33pf 15pf 3.3pf COMP CC 7 COMP RC RC 100W 100W 100W — RCL = .7 ILIM CC RATED FOR FULL SUPPLY VOLTAGE Q17 Q18 Q13 Q16 D2 PA88U http://www.cirrus.com –VS 6 Copyright © Cirrus Logic, Inc. 2009 (All Rights Reserved) MAY 20091 APEX − PA88UREVN PA88 • PA88A P r o d u c t I n n o v a t i o nF r o m ABSOLUTE MAXIMUM RATINGS SUPPLY VOLTAGE, +VS to –VS OUTPUT CURRENT, source, sink POWER DISSIPATION, continuous @ TC = 25°C INPUT VOLTAGE, differential INPUT VOLTAGE, common mode TEMPERATURE, pin solder - 10s max TEMPERATURE, junction2 TEMPERATURE, storage OPERATING TEMPERATURE RANGE, case SPECIFICATIONS PARAMETER TEST CONDITIONS 1 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 NOISE VCM = ±90V 100kHz BW, RS = 1KΩ, CC = 15pf GAIN OPEN LOOP, @ 15Hz GAIN BANDWIDTH PRODUCT at 1MHz POWER BANDWIDTH PHASE MARGIN RL = 2KΩ, CC = OPEN RL = 2KΩ, CC = 15pf, RC = 100Ω RL = 2KΩ, CC = 15pf, RC = 100Ω Full temperature range OUTPUT VOLTAGE SWING4 VOLTAGE SWING4 CURRENT, continuous SLEW RATE, AV = 20 SLEW RATE, AV = 100 CAPACITIVE LOAD, AV = +1 SETTLING TIME to .1% RESISTANCE, no load Full temp. range, IO = ±75mA Full temp. range, IO = ±20mA TC = 85°C CC = 15pf, RC = 100Ω CC = OPEN Full temperature range CC = 15pf, RC = 100Ω, 2V step RCL = 0 POWER SUPPLY VOLTAGE6 CURRENT, quiescent, THERMAL RESISTANCE, AC, junction to case5 RESISTANCE, DC, junction to case RESISTANCE, junction to air TEMPERATURE RANGE, case MIN Full temperature range See note 6 Full temperature range, F > 60Hz Full temperature range, F < 60Hz Full temperature range Meets full range specifications ±VS–15 90 96 PA88 TYP .5 10 1 75 5 .01 2.5 1011 4 110 2 111 2.1 6 60 ±VS–16 ±VS–14 ±VS–10 ±VS–5.2 ±100 8 30 470 10 100 ±15 –25 ±200 1.7 30 450V See SOA 15W ±25V ±VS 300°C 150°C –65 to +150°C –55 to +125°C PA88A MAX MIN TYP MAX 2 .25 .5 30 5 10 5 * * * 50 3 10 * 100 3 20 * * * * * * * UNITS mV µV/°C µV/V µV/√kh pA pA/V pA Ω pF V dB µVrms * * * * dB MHz kHz ° * * * * * * * * * * V V mA V/µs V/µs pf µs Ω ±225 * 2 * * * * 5.0 * 8.3 * * +85 * * V mA °C/W °C/W °C/W °C NOTES: * The specification of PA88A is identical to the specification for PA88 in applicable column to the left. 1. Unless otherwise noted: TC = 25°C, compensation = CC = 68pF, RC = 100Ω. DC input specifications are ± value given. Power supply voltage is typical rating. 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 power supply rail respectively. 5. Rating applies if the output current alternates between both output transistors at a rate faster than 60Hz. 6. Derate max supply rating .625 V/°C below 25°C case. No derating needed above 25°C case. CAUTION 2 The PA88 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. PA88U PA88 • PA88A P r o d u c t I n n o v a t i o nF r o m POWER DERATING PHASE RESPONSE T = TC 2.5 CC = 33pF –90 CC = 68pF –120 –150 CC = 33pF –180 0 0 25 50 75 100 125 TEMPERATURE, T (°C) 150 –210 OUTPUT VOLTAGE SWING 20 2 20 1 .0001 COMMON MODE REJECTION 120 100 80 60 40 20 1 PA88U 10 100 1K 10K .1M FREQUENCY, F (Hz) 1M 25 1K 30 300 3K FREQUENCY, F (Hz) 3 30K 15 10 7 5 3 2 10 POWER SUPPLY REJECTION 120 120 100 80 60 40 20 1 10 100 1K 10K .1M FREQUENCY, F (Hz) 1M 100 1K 10K FREQUENCY, F (Hz) 1M CURRENT LIMIT 200 100 2K 3K 5K 10K 20K 50K 100K FREQUENCY, F (Hz) INPUT NOISE 20 140 CURRENT LIMIT, ILIM (mA) DISTORTION, (%) .01 .001 0 10 20 30 40 50 60 70 COMPENSATION CAPACITOR, CC (pF) COMMON MODE REJECTION, CMR (dB) .1 2 POWER SUPPLY REJECTION, PSR (dB) SLEW RATE, (V/μS) 3 50 100 RL = 2KΩ PO = 2.5W AV = 30 1 5 40 60 80 OUTPUT CURRENT, IO (mA) 75 HARMONIC DISTORTION 30 10 TC=-55°C TC=25°C f 4 .3p 6 =3 8 125 100 f 10 f TC=85°C 12 250 5p 14 CC TC=125°C 10 20 POWER RESPONSE 500 Positive 18 Negative 16 100 300 200 450 TOTAL SUPPLY VOLTAGE, VS (V) =1 SLEW RATE 50 0 CC 100 1K 10K .1M 1M 10M FREQUENCY, F (Hz) 1.0 100 1K 10K .1M 1M 10M FREQUENCY, F (Hz) f 10 1.25 3p 1 1.5 8p 0 °C T C = 25 °C 5 T C = -5 1.75 =3 CC = 68pF 20 10 2.0 =6 CC = 33pF 40 1 25°C TC = 1 CC CC = 15pF 60 CC = 3.3pF 2.25 CC CC = 3.3pF 80 VOLTAGE DROP FROM SUPPLY, Vs-Vo, (V) SMALL SIGNAL RESPONSE 100 CC = 68pF OUTPUT VOLTAGE, VO (VPP) T = TA 120 OPEN LOOP GAIN, A (dB) PHASE, Ф (°) 7.5 5 CC = 3.3pF –60 10 –20 QUIESCENT CURRENT, IQ (mA) –30 12.5 QUIESCENT CURRENT 2.5 0 INPUT NOISE VOLTAGE, VN (nV/√Hz) INTERNAL POWER DISSIPATION, P (W) 15 70 50 30 20 10 5 50 3 10 20 100 150 CURRENT LIMIT RESISTOR, RCL (Ω) 3 PA88 • PA88A P r o d u c t I n n o v a t i o nF r o m GENERAL INPUT PROTECTION 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. Although the PA88 can withstand differential input voltages up to ±25V, additional external protection is recommended, and required at total supply voltages above 300 volts. In most applications 1N4148 or 1N914 signal diodes are sufficient (D1, D2 in Figure 2a). In more demanding applications where low leakage or low capacitance are of concern 2N4416 or 2N54572N5459 JFETs connected as diodes will be required (Q1, Q2 in Figure 2b). In either case the input differential voltage will be clamped to ±.7V. This is sufficient overdrive to produce maximum power bandwidth. 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 SAFE OPERATING AREA (SOA) 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. SOA OUTPUT CURRENT FROM +VS OR –VS, (mA) 250 10 150 0m 100 ,T C DC 50 ,T C C = 25 °C 85 °C DC ,T = S S DC 25 0m 20 = 12 5° C 15 10 5 25 PULSE CURVES @ 10% DUTY CYCLE MAX 50 75 100 125 250 500 SUPPLY TO OUTPUT DIFFERENTIAL, VS –VO (V) NOTE: The output stage is protected against transient flyback. However, for protection against sustained, high energy flyback, external fast-recovery diodes should be used. POWER SUPPLY PROTECTION Unidirectional zener diode transient suppressors 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 reversal 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. STABILITY The PA88 has sufficient phase margin to be stable with most capacitive loads at a gain of 4 or more, using the recommended phase a. +VS compensation. The PA88 is exterZ1 nally compensated and performance can 3 5 be tailored to the –IN application. Use the D1 D2 PA88 graphs of small signal +IN response and power 4 6 response as a guide. The compensation Z2 capacitor C C must be rated at 500V –VS working voltage. An b. +VS NPO capacitor is Z1 recommended. The compensation net3 work CCRC must be 5 –IN mounted closely to Q1 Q2 PA88 the amplifier pins 7 and 8 to avoid spuri- +IN 4 ous oscillation. 6 Z2 –VS FIGURE 2. OVERVOLTAGE PROTECTION 4 PA88U P r o d u c t I n n o v a t i o nF r o m PA88 • PA88A 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. 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