apex microtechnology corporation ? 5980 north shannon road ? tucson, arizona 85741 ? usa ? applications hotline: 1 (800) 546-2739 344 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 ampli?er 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 con?guration. 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 ampli?ers against shorts to common at supply voltages up to 120v. for operation into inductive loads, two external ?yback 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) ?lm 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/ampli?er 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, ?yback diodes, voltage clamps or other protection networks must be added to protect the ampli?er from high voltages which may be generated. equivalent schematic ????? ????? ?????? ?? ???? ?????????????????????????????????????? ???? ?????? ????? ?????????? ???? ??? ? ?? ?? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ????????????????????????????????????????? ???????????? ? ? ? ? ? ? ? ?? ?? ?? ?? ??? ???? ?? ?? ?? ??? ?? ?? ?? ??? ??? ?? ?? ???? ??? ?? ?? ?? ??? ?? ?? ??? ???????? ? ? ? ? ? ? ? ? ?? ? ??? ??? ??? ???? ?????? ??? ?? ? ????? ??????????????????????????????????? ?????????????????????????????????? ???????????????????????????????? 8-pin to-3 package style ce
apex microtechnology corporation ? telephone (520) 690-8600 ? fax (520) 888-3329 ? orders (520) 690-8601 ? email prodlit@apexmicrotech.com 345 absolute maximum ratings specifications specifications absolute maximum ratings supply voltage, +v s to Cv s 300v output current, within soa internally limited power dissipation, internal at t c = 25c 1 17.5w input voltage, differential 300v input voltage, common mode 300v temperature, pin solder - 10s max (solder) 300c temperature, junction 175c temperature range, storage C65 to +150c operating temperature range, case C55 to +125c PA83 PA83a parameter test conditions 2 min typ max min typ max units input offset voltage, initial t c = 25c 1.5 3 .5 1 mv offset voltage, vs. temperature full temperature range 10 25 5 10 v/c offset voltage, vs. supply t c = 25c .5 .2 v/v offset voltage, vs. time t c = 25c 75 * v/kh bias current, initial 3 t c = 25c 5 50 3 10 pa bias current, vs. supply t c = 25c .01 * pa/v offset current, initial 3 t c = 25c 2.5 50 1.5 10 pa offset current, vs. supply t c = 25c .01 * pa/v input impedance, dc t c = 25c 10 11 * input capacitance full temperature range 6 * pf common mode voltage range 4 full temperature range v s C10 * v common mode rejection, dc full temperature range 130 * db gain open loop gain at 10hz t c = 25c, r l = 2k 96 116 * * db unity gain crossover freq. t c = 25c, r l = 2k? 5 3 * mhz power bandwidth t c = 25c, r l = 10k? 60 40 * khz phase margin full temperature range 60 * output voltage swing 4 , full load full temp. range, i o = 75ma v s C10 v s C5 * * v voltage swing 4 full temp. range, i o = 15ma v s C5 v s C3 * * v current, peak t c = 25c 75 * ma current, short circuit t c = 25c 100 * ma slew rate 6 t c = 25c, r l = 2k? 20 30 * * v/s capacitive load, unity gain full temperature range 10 * nf capacitive load, gain > 4 full temperature range soa * f settling time to .1% t c = 25c, r l = 2k?, 10v step 12 * s power supply voltage t c = C55c to +125c 15 150 150 * * * v current, quiescent t c = 25c 6 8.5 * * ma thermal resistance, ac, junction to case 5 f > 60hz 4.26 * c/w resistance, dc, junction to case f < 60hz 6.22 8.57 * * c/w resistance, case to air 30 * c/w temp. range, case (PA83/PA83a) meets full range speci?cation C25 +85 * * c PA83 ? PA83a notes: * the speci?cation of PA83a is identical to the speci? cation for PA83 in applicable column to the left. 1. long term operation at the maximum junction temperature will result in reduced product life. derate internal power dissipation to achieve high mttf. 2. the power supply voltage for all tests is the typ rating, unless otherwise noted as a test condition. 3. doubles for every 10c of temperature increase. 4. +v s and Cv s denote the positive and negative supply rail respectively. total v s is measured from +v s to Cv s . 5. rating applies if the output current alternates between both output transistors at a rate faster than 60hz. 6. signal slew rates at pins 5 and 6 must be limited to less than 1v/ns to avoid damage. when faster waveforms are unavoidable, resistors in series with those pins, limiting current to 150ma will protect the ampli?er from damage. 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
apex microtechnology corporation ? 5980 north shannon road ? tucson, arizona 85741 ? usa ? applications hotline: 1 (800) 546-2739 346 typical performance graphs PA83 ? PA83a ??? ??? ? ??? ??? ????????????? ??? ????????????????? ?????????????????????? ? ????????? ? ????????????????? ??? ? ?? ????????????????????? ????????????????? ?? ????? ?? ?? ?? ??? ?? ???? ???? ??? ? ?????????????? ??? ??? ????????????????? ????????????????? ? ??? ?? ? ?????????????? ????????????????? ? ??? ? ? ??? ??????????????????????? ? ???? ?? ?? ??? ???????????????????? ???????????????????????? ?? ??? ???????????????????? ??????????????????????? ?? ??? ?? ? ? ????????????????? ????????????????????? ??????????????????????????????? ?? ?? ??? ?? ??? ? ????????????????? ?????????????????????? ???????????????????????????????? ? ?? ??? ? ???????????????????? ????????????????? ??? ???? ? ??????????? ??? ?? ?? ?? ??? ?????????????? ?? ?? ??? ??? ??? ?? ?? ?? ? ? ?? ???? ???????????? ??????????????????????????? ? ???? ? ???? ?? ?? ?? ??? ?? ??? ? ?? ?? ?? ?? ??? ??? ?? ? ???? ???? ? ??? ??? ?? ??? ??? ??? ??? ??? ?? ??? ????????????????? ? ??? ??? ??? ?? ?? ??? ????????????????? ??? ? ?? ??? ?? ?? ??? ?? ??? ??? ? ? ?? ?? ?? ? ? ?? ??? ??? ? ??? ? ??? ??? ??? ?? ?? ??? ??? ??? ?? ?? ??? ??? ??? ??? ??? ??? ? ? ? ?? ?? ?? ?? ?? ??? ??? ??? ??????????????????? ? ????? ???????????????? ? ????? ???????????? ??? ? ?? ??? ?? ??? ??? ??? ??? ?? ?? ??? ??? ??? ??? ? ? ??????? ? ? ??????? ? ? ???????? ???? ? ????????? ? ????????? ???? ? ????????? ? ????????? ???? ? ????????? ? ????????? ???? ? ????????? ? ????????? ? ? ?????? ? ? ?????? ? ? ?????? ? ? ?????? ? ? ?????? ? ?? ????????? ? ??????? ?? ? ?? ? ? ?? ?? ?? ??? ??? ??????????????????? ? ? ?? ?????????????? ????????????????????????????? ? ???? ??? ?? ??? ??? ???? ?? ????
apex microtechnology corporation ? telephone (520) 690-8600 ? fax (520) 888-3329 ? orders (520) 690-8601 ? email prodlit@apexmicrotech.com 347 operating considerations PA83 ? PA83a general please read application note 1 "general operating con - siderations" which covers stability, supplies, heat sinking, mounting, current limit, soa interpretation, and speci?cation interpretation. visit www.apexmicrotech.com for design tools that help automate tasks such as calculations for stability, in - ternal power dissipation, current limit and heat sink selection. the "application notes" and "technical seminar" sections contain a wealth of information on speci?c 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 product models, consult the "evaluation kit" section for details. for the most current version of all apex product data sheets, visit www.apexmicrotech.com. safe operating area (soa) the bipolar output stage of this high voltage ampli?er 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 speci?ed 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: ?? ? ?? ? ????????????????????????????????????? this data sheet has been carefully checked and is believed to be reliable, however, no responsibility is assumed for possible inaccuracies or omissions. all speci?cations are subject to change without notice. PA83u rev o nonember 2004 ? 2004 apex microtechnology corp. ??? ??? ??? ?? ?? ?? ?? ??? ??? ??? ??? ??? ??? ?? ?? ??????????????????????????????????????????? ?????????????????????? ? ?????? ? ????? ?????????????????????? ????????? ??????? ???????????????? ??????? ???????????? ??? 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 ?yback. however, for protection against sustained, high energy ?yback, external fast-recovery diodes should be used. inductive loads two external diodes as shown in figure 1, are required to protect these ampli?ers against ?yback (kickback) pulses exceeding the supply voltages of the ampli?er 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 ?yback 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 ?yback 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.
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