pa83 ? PA83A pa83u 1 pa83, PA83A features ? low bias current, low noise fet input ? fully protected input up to 150v ? wide supply range 15v to 150v applications ? high voltage instrumentation ? electrostatic transducers & deflection ? programmable power supplies up to 290v ? analog simulators description the pa83 is a high voltage operational amplifer designed for output voltage swings up to 145v with a dual () supply or 290v with a single supply. its input stage is protected against transient and steady state overvoltages up to and including the supply rails. high accuracy is achieved with a cascode input circuit confguration. all internal biasing is referenced to a zener diode fed by a fet constant current source. as a result, the pa83 features an unprecedented supply range and excellent supply rejection. the output stage is biased in the class a/b mode for linear operation. internal phase com - pensation assures stability at all gain settings without need for external components. fixed current limits protect these amplifers against shorts to common at supply voltages up to 120v. for operation into inductive loads, two external fyback pulse protection diodes are recommended. however, a heatsink may be necessary to maintain the proper case temperature under normal operating conditions. this hybrid circuit utilizes beryllia (beo) substrates, thick (cermet) flm resistors, ceramic capacitors and silicon semicon - ductor 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 iso - lated. the use of compressible thermal isolation washers and/or improper mounting torque voids product warranty. please see application note 1 general operating considerations. external connections typical application while piezo electric transducers present a complex imped - ance, they are often primarily capacitive at useful frequen - cies. due to this capacitance, the speed limitation for a given transducer/amplifer combination may well stem from limited current drive rather than power bandwidth restrictions. with its drive capability of 75ma, the pa83 can drive transducers having up to 2nf of capacitance at 40khz at maximum output voltage. in the event the transducer may be subject to shock or vibration, fyback diodes, voltage clamps or other protection networks must be added to protect the amplifer from high voltages which may be generated. equivalent schematic +150v C150v 100k a1 pa83 simple piezo electric transducer drive 5v 3.57k gated oscillator i = ?v * c ?t 2 7 4 3 5 6 1 q1 q2 d1 d2 q15 q12b q9 c4 q8 q13 q4 q3 c1 q16 q17 q5 c5 q12a q14 c6 c2 c3 q10 q6 q7 q11 top view 1 2 3 4 5 6 7 8 Cv s +in Cin bal n.c. output bal +v s note: 1. pin 8 not internally connected. 2. input offset trimpot optional. recommended value of 100k. 8-pin to-3 package style ce high voltage power operational amplifiers pa83 ? PA83A 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 ? pa83urevq 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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pa83 ? PA83A pa83u 3 C55 100 0 200 250 current limit 100 frequency, f (hz) input noise voltage, v n (nv/hz) 1 frequency, f (hz) C20 0 60 small signal response open loop gain, a ol (db) 20 40 80 100 10 C210 C150 C60 0 phase response C90 C30 frequency, f (hz) output voltage, v o (v pp ) pulse response output voltage, v o (v p ) 200 total supply voltage, v s (v) .4 .6 1.6 slew rate vs. supply normalized slew rate (x) .8 1.4 common mode voltage common mode voltage, v cm (v pp ) 1 frequency, f (hz) common mode rejection common mode rejection, cmr (db) 40 80 120 10 100 1 frequency, f (hz) power supply rejection power supply rejection, psr (db) 0 60 100 7 output voltage swing current limit, i lim (a) 6 input noise C25 25 50 75 150 power response 30 50 100 150 1.2 20 40 80 2 3 1k 100k phase, () voltage drop from supply, v s C v o (v) 4 20 60 100 10 100 0 20 40 60 80 100 1.0 50 8 C180 C120 0 125 100 1k 10k .1m 250 300 10k 1m 10m frequency, f (hz) 1 120 120 100 10 1m 10m frequency, f (hz) 140 0 1k 10k 1m 1k 10k 1m 120 140 6 0 C4 C6 C2 4 2 .5 1.5 2.5 1 C.5 0 2.0 .1m .1m 30 60 100 200 300 15 1m 10k .1m 20k 50k .2m .5m 2 4 6 10 20 15 10 1k 10k .1m 100 case temperature, t c (c) output current i o (ma) time, t (s) 3.0 5 15 100 1m .1m 50k .2m .5m 30 60 200 300 .3m .7m t c = 25c t c = 85c t c = C25c | +v s | + | Cv s | = 100v | +v s | + | Cv s | = 300v | +v s | + | Cv s | = 300v | +v s | + | Cv s | = 100v r l = 2k r l = 2k r l = 2k r l = 2k r l = 2k v in = 5v, t r =100ns +v s Cv s 0 25 50 75 100 125 temperature, t (c) 0 5 10 power derating internal power dissipation, p d (w) 2.5 15 150 7.5 12.5 20 17.5 p r o d u c t i n n o v a t i o n f r o m
pa83 ? PA83A 4 pa83u general please read application note 1 "general operating consider - ations" 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 and heat sink selection. the "application notes" and "technical seminar" sections contain a wealth of informa - tion on specifc types of applications. package outlines, heat sinks, mounting hardware and other accessories are located in the "packages and accessories" section. evaluation kits are available for most apex precision power product models, consult the "evaluation kit" section for details. for the most current version of all apex precision power product data sheets, visit www.cirrus.com. safe operating area (soa) the bipolar output stage of this high voltage amplifer has two distinct limitations. 1. the internal current limit, which limits maximum available output current. 2. the second breakdown effect, which occurs whenever the simultaneous collector current and collector-emitter voltage exceed specifed limits. the soa curves combine the effect of these limits. for a given application, the direction 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. however, the following guidelines may save extensive analytical efforts: +v s Cv s figure 1. protection, inductive load 100 300 200 20 30 40 50 100 200 150 250 150 120 80 70 internal voltage drop, supply to output (v) output current from +v s or -v s (ma) internal current limit t = 0.5ms t = 1ms second breakdown t = 5ms steady state soa 1. the following capacitive and inductive loads are safe: v s c(max) l(max) 150v .7 f 1.5h 125v 2.0f 2.5h 100v 5.f 6.0h 75v 60f 30h 50v all all 2. short circuits to ground are safe with dual supplies up to 120v or single supplies up to 120v. 3. short circuits to the supply rails are safe with total supply voltages up to 120v, e.g. 60v. 4. the output stage is protected against transient fyback. however, for protection against sustained, high energy fyback, external fast-recovery diodes should be used. inductive loads two external diodes as shown in figure 1, are required to protect these amplifers against fyback (kickback) pulses exceeding the supply voltages of the amplifer when driving inductive loads. for component selection, these external diodes must be very quick, such as ultra fast recovery diodes with no more than 200 nanoseconds of reverse recovery time. be sure the diode voltage rating is greater than the total of both supplies. the diode will turn on to divert the fyback energy into the supply rails thus protecting the output transistors from destruction due to reverse bias. a note of caution about the supply. the energy of the fyback pulse must be absorbed by the power supply. as a result, a tran - sient will be superimposed on the supply voltage, the magnitude of the transient being a function of its transient impedance and current sinking capability. if the supply voltage plus transient exceeds the maximum supply rating or if the ac impedance of the supply is unknown, it is best to clamp the output and the supply with a zener diode to absorb the transient. p r o d u c t i n n o v a t i o n f r o m
pa83 ? PA83A pa83u 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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