PA89 ? PA89a PA89u 1 PA89, PA89a external connections typical application ultra-high voltage capability combined with the bridge am - plifer confguration makes it possible to develop +/C1000 volt peak swings across a piezo element. a high gain of C50 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. a1 PA89 a2 PA89 r 50r C600v v in piezo transducer 50r r +600v C600v +600v single axis micro-positioning 50r cn patented phase compensation gain c c r c 1 470pf 470 10 68pf 220 15 33pf 220 100 15pf 220 note: c c must be rated for full supply voltage Cvs to +vs. see details under external components. top view Cin +in n/c n/c Cv s out reserved reserved comp comp +v c s c c r c l r cl r = cl i lim .7 1 2 3 4 5 6 12 11 10 9 8 7 top view features ? 1140v p-p signal output ? wide supply range 75v to 600v ? programmable current limit ? 75 ma continuous output current ? her metic sealed package ? input protection applications ? piezoelectric positioning ? high voltage instrum entation ? electrostatic deflection ? se m iconductor testing description the PA89 is an ultra high voltage, mosfet operational ampli - fer 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 confguration 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 fexibility. the PA89 is 100% gross leak tested to military standards for long term reliability. this hybrid integrated circuit utilizes a beryllia (beo) sub - strate, thick flm resistors, ceramic capacitors and semiconduc - tor 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. simplified schem atic 7 6 8 5 2 1 10 9 +in Cin comp c out +v s Cv s l q1 q2 q3 q19 q20 q22 q23 q26 q25a q25b q29 q36 q45 q44 q42 d1 d57 d30 d35 d34 d31 d5 high v oltage m o-127 package style dc high voltage power operational amplifiers PA89 ? PA89a p r o d u c t i n n o v a t i o n f r o m copyright ? cirrus logic, inc. 2009 (all rights reserved) http://www.cirrus.com may 2009 apex ? PA89urevj p r o d u c t i n n o v a t i o n f r o m
PA89 ? PA89a 2 PA89u specifications absolute maximum ratings supply voltage, +v s to Cv s 1200v output current, within soa 100ma power dissipation, internal at t c = 25c 40w input voltage, differential 25v input voltage, common mode v s 25v temperature, pin solder - 10s max 300c temperature, junction 2 150c temperature, storage C65 to 125c operating temperature range, case C55 to 125c PA89 PA89a parameter test conditions 1 min typ max min typ max units input offset voltage, initial .5 2 .25 .5 mv offset voltage, vs. temperature full temperature range 10 30 5 10 v/c offset voltage, vs. supply 7 * v/v offset voltage, vs. time 75 * v/kh bias current, initial 3 5 50 3 10 pa bias current,vs. supply .01 * pa/v offset current, initial 3 5 50 3 20 pa input impedance, dc 10 5 * m input capacitance 4 * pf common mode voltage range 4 full temperature range v s 50 * v common mode rejection, dc full temperature range, v cm = 90v 96 110 * * db input noise 10khz bw, r s = 10k, c c = 15pf 4 v rms gain open loop gain at 10hz r l = 10k, c c = 15pf 108 120 * * db gain bandwidth product r l = 10k, c c = 15pf, a v = 100 10 * mhz power bandwidth r l = 10k, c c = 15pf, v o = 500v p-p 5 * khz phase margin full temperature range, a v = 10 60 * output voltage swing 4 i o = 75ma v s 45 v s 30 * * v voltage swing 4 full temperature range, i o = 20ma v s 20 v s 12 * * v current, continuous full temperature range 75 * ma slew rate c c = 15pf, a v = 100 12 16 * * v/s capacitive load, av = 10 full temperature range 1 * nf capacitive load, av>10 full temperature range soa * settling time to .1% r l = 10k, 10v step, av = 10 2 * s power supply voltage, v s 4 full temperature range 75 500 600 * * * v current, quiescent 4.8 6.0 * * ma thermal resistance, ac, junction to case 5 full temperature range, f > 60hz 2.1 2.3 * * c/w resistance, dc, junction to case full temperature range, f < 60hz 3.3 3.5 * * c/w resistance, junction to air full temperature range 15 * c/w temperature range, case meets full range specifcations C25 +85 * * c 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 850c to avoid generating toxic fumes. caution notes: * the specifcation of PA89a is identical to the specifcation for PA89 in applicable column to the left. 1. unless otherwise noted: t c = 25c, c c = 68pf, r c = 220, and v s = 500v. input parameters for bias currents and offset volt - age 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 10c of temperature increase. 4. +v s and Cv s 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. p r o d u c t i n n o v a t i o n f r o m
PA89 ? PA89a PA89u 3 0 25 50 75 100 125 150 case temperature, t c (c) 0 8 24 32 power derating output stage internal power dissipation, p(w) 1 100 1k 10m frequency f (hz) C270 C180 C45 0 phase response phase, () C135 C225 10 100 10k 100k frequency, f (hz) input noise voltage, e n (nv/hz) 1 100 10m frequency, f (hz) C20 0 60 120 small signal response open loop gain, a (db) 20 40 80 100 1k 3k 30k 100k frequency, f (hz) 100 500 1000 output voltage, v o (v p-p ) 300 600 1 100 10k 10m frequency, f (hz) 0 60 100 common mode rejection common mode rejection, cmr (db) 20 40 80 1 10m frequency, f (hz) 0 20 100 power supply rejection power supply rejection, psr (db) 40 80 0 40 60 100 resistor value, r cl () 0 40 100 current limit current limit, i lim (ma) 60 80 0 75 ext. compensation capacitor, c c (pf) 5 slew rate vs comp slew rate, (v/ s) 10 15 20 100 25 50. 30 300 3k frequency, f (hz) .01 .1 harmonic distortion distortion, thd (%) 1 10 100k 100 1k 10k 0 200 800 1200 total supply voltage, v s (v) .9 1.10 quiescent current normalized quiescent current, i q (x) 1.05 10 1k 100k 1m 20 80 20 30k input noise voltage 1k 2 7 10 20 3 5 15 15pf, 220 33pf, 220 68pf, 220 10 10k 100k 1m C90 16 40 power response 800 1200 10k c c = 68pf c c = 33pf c c = 15pf 10 100 1k 10k 100k 1m 60 400 600 1000 .95 1.00 68pf, 220 33pf, 220 15pf, 220 v o = 800vpp v o = 600vpp v o = 400vpp v o = 100vpp .001 10 1k 10k 100k 1m c c , r c c c , r c r c = 220 v s = 500v c c = 15pf, r c = 220 r l = 11k a v = 100 output voltage swing 0 5 10 15 20 25 30 35 40 45 output current, i o ,(ma) voltage drop from supply, v s -v o (v) 25 50 75 100 0 p r o d u c t i n n o v a t i o n f r o m
PA89 ? PA89a 4 PA89u general please read application note 1 "general operating con - siderations" which covers stability, supplies, heat sinking, mounting, current limit, soa interpretation, and specifcation 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 powers complete application notes library; technical seminar workbook; and evaluation kits. sta bility 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 compensa - tion to increase the phase margin of the application circuit as illustrated in the typical application drawing. safe operating area (soa) the mosfet output stage of this power operational ampli - fer 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 fyback. however, for protection against sustained, high energy fyback, external fast-recovery diodes should be used. safe operating curves the safe operating area curves defne the maximum ad - ditional internal power dissipation the amplifer 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 specifcation since the quiescent power dissipation is signifcant compared to the total. external components the very high operating voltages of the PA89 demand con - sideration of two component specifcations rarely of con cern in building op amp circuits: voltage rating and voltage coefficient. the compensation capacitance c c must be rated for the full supply voltage range. for example, with supply voltages of 500v the possible voltage swing across c c is 1000v. in addition, a voltage coefficient less than 100ppm is recom - mended 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 coef - fcient 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 fve 200kohm, 1/4 watt metal flm resistors in series will produce the proper voltage rating, voltage coefficient and wattage rating. current limit for proper operation the current limit resistor (r cl ) 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 r cl = i lim when setting the value for r cl 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 approxi - mately -0.3% /c of case temperature rise. cautions 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 recom - mended 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 amplifer as possible. 300 500 800 1000 1200 supply to output differential voltage, v s C v o (v) 3 10 30 output current from +v s or Cv s (ma) 100 200 5 15 50 100ms 25c 85c 125c t = t case 10ms 100 soa p r o d u c t i n n o v a t i o n f r o m
PA89 ? PA89a PA89u 5 cont acting 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 apex.support@cirrus.com. international customers can also request support by contacting their local cirrus logic sales representative. to fnd 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, indemnifcation, and limitation of liability. no responsibility is assumed by cirrus for the use of this information, including use of this information as the basis for manufacture or sale of any items, or for infringement of patents or other rights of third parties. this document is the property of cirrus and by furnishing this information, cirrus grants no license, express or implied under any patents, mask work rights, copyrights, trademarks, trade secrets or other intellectual property rights. cirrus owns the copyrights associated with the information contained herein and gives con - sent for copies to be made of the information only for use within your organization with respect to cirrus integrated circuits or other products of cirrus. this consent does not extend to other copying such as copying for general distribution, advertising or promotional purposes, or for creating any work for resale. certain applications using semiconductor products may involve potential risks of death, personal injury, or severe prop - erty or environmental damage (critical applications). cirrus products are not designed, authorized or warranted to be suitable for use in products surgically implanted into the body, automotive safety or security devices, life support prod - ucts or other critical applications. inclusion of cirrus products in such applications is understood to be fully at the cus - tomers risk and cirrus disclaims and makes no warranty, express, statutory or implied, including the implied warranties of merchantability and fitness for particular purpose, with regard to any cirrus product that is used in such a manner. if the customer or customers customer uses or permits the use of cirrus products in critical applications, customer agrees, by such use, to fully indemnify cirrus, its officers, directors, employees, distributors and other agents from any and all liability, including attorneys fees and costs, that may result from or arise in connection with these uses. cirrus logic, cirrus, and the cirrus logic logo designs, apex precision power, apex and the apex precision power logo designs are trademarks of cirrus logic, inc. all other brand and product names in this document may be trademarks or service marks of their respective owners. p r o d u c t i n n o v a t i o n f r o m
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