apex microtechnology corporation ? telephone (520) 690-8600 ? fax (520) 888-3329 ? orders (520) 690-8601 ? email prodlit@apexmicrotech.com 1 external connections typical application ultra-high voltage capability combined with the bridge ampli - ?er con?guration 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. ?? ???? ?? ???? ? ??? ????? ? ?? ????? ?????????? ??? ? ????? ????? ????? ????????????????????????????? ??? ?? 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. ??? ???? ??? ??? ??? ??? ? ? ? ?? ????? ???????? ???????? ?????????????????? ?????????????????? ?? ??? ? ? ? ? ? ? ?????? ?? ??????? ?? ? ??? ?? ? ? ? ? ? ? ?? ?? ?? ? ? ? ??? ???? 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 applications ? piezoelectric positioning ? high voltage instrumentation ? electrostatic deflection ? semiconductor testing description the pa89 is an ultra high voltage, mosfet operational ampli?er 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 con?guration 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 ?exibility. 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 ?lm 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 schematic ? ? ? ? ? ? ?? ? ??? ??? ???? ? ??? ?? ? ?? ? ? ?? ?? ?? ??? ??? ??? ??? ??? ???? ???? ??? ??? ??? ??? ??? ?? ??? ??? ??? ??? ??? ?? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ????????????????????????????????????????? ???????????? high voltage mo-127 package style dc
apex microtechnology corporation ? 5980 north shannon road ? tucson, arizona 85741 ? usa ? applications hotline: 1 (800) 546-2739 2 absolute maximum ratings specifications pa89 ? PA89A 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 speci?cations 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 speci?cation of PA89A is identical to the speci? cation 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.
apex microtechnology corporation ? telephone (520) 690-8600 ? fax (520) 888-3329 ? orders (520) 690-8601 ? email prodlit@apexmicrotech.com 3 typical performance graphs pa89 ? PA89A ? ?? ?? ?? ??? ??? ??? ??????????????????? ? ????? ? ? ?? ?? ?????????????? ???????????? ???????????????????????????????? ? ??? ?? ??? ???????????????? ???? ???? ??? ? ?????????????? ???????????? ???? ???? ?? ??? ??? ???? ????????????????? ?????????????????????? ? ????????? ? ??? ??? ????????????????? ??? ? ?? ??? ????????????????????? ?????????????????????? ?? ?? ?? ??? ?? ?? ??? ???? ????????????????? ??? ??? ???? ????????????????? ? ??? ??? ? ??? ??? ? ??? ??? ??? ????????????????? ? ?? ??? ????????????????????? ??????????????????????????????? ?? ?? ?? ? ??? ????????????????? ? ?? ??? ?????????????????????? ???????????????????????????????? ?? ?? ? ?? ?? ??? ????????????????? ?? ???? ? ?? ??? ????????????? ???????????????? ??? ????? ?? ?? ? ?? ?????????????????????????????? ? ????? ? ????????????????? ?????????????????? ?? ?? ?? ??? ?? ??? ?? ??? ?? ????????????????? ??? ?? ??????????????????? ??????????????????? ? ?? ???? ??? ?? ??? ? ??? ??? ???? ??????????????????????? ? ???? ?? ???? ????????????????? ??????????????????????????????? ? ???? ???? ?? ?? ???? ?? ?? ?? ?? ??? ??????????????????? ?? ? ? ?? ?? ? ? ?? ?????????? ?????????? ?????????? ?? ??? ???? ?? ??? ?? ?? ?????????????? ??? ???? ??? ? ? ??????? ? ? ??????? ? ? ??????? ?? ??? ?? ??? ???? ?? ?? ??? ??? ???? ??? ???? ?????????? ?????????? ?????????? ? ? ????????? ? ? ????????? ? ? ????????? ? ? ????????? ???? ?? ?? ??? ???? ?? ? ? ??? ? ? ? ??? ? ? ? ??????? ? ? ???????? ? ? ????????? ? ? ??????? ? ? ??????? ? ? ?????? ???????????????????? ? ? ?? ?? ?? ?? ?? ?? ?? ?? ????????????????? ? ????? ??????????????????????????? ? ?? ? ???? ?? ?? ?? ??? ?
apex microtechnology corporation ? 5980 north shannon road ? tucson, arizona 85741 ? usa ? applications hotline: 1 (800) 546-2739 4 operating considerations pa89 ? PA89A 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, internal power dissipation, current limit; heat sink selection; apexs 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 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 - ?er 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 ?yback. however, for protection against sustained, high energy ?yback, external fast-recovery diodes should be used. safe operating curves the safe operating area curves de?ne the maximum ad - ditional internal power dissipation the ampli?er 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 speci?cation since the quiescent power dissipation is signi?cant compared to the total. external components the very high operating voltages of the pa89 demand consideration of two component speci?cations rarely of con - cern in building op amp circuits: voltage rating and voltage coef?cient. 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 coef?cient 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 - ?cient 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 coef?cient 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 ?ve 200kohm, 1/4 watt metal ?lm resistors in series will produce the proper voltage rating, voltage coef?cient 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 coef?cient 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 ampli?er as possible. ??? ??? ??? ???? ???? ???????????????????????????????????????? ? ???? ? ???? ? ?? ?? ?????????????????????? ? ?????? ? ????? ??? ??? ? ?? ?? ????? ???? ???? ????? ????? ???? ???? ??? ??? 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. pa89u rev h may 2005 ? 2005 apex microtechnology corp.
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