apex microtechnology corporation ? telephone (520) 690-8600 ? fax (520) 888-3329 ? orders (520) 690-8601 ? email prodlit@apexmicrotech.com 1 features ? high voltage 450v (225v) ? high slew rate 1000v/ s ? high output current 200 m a applications ? high voltage instrumentation ? piezo transducer excitation ? programmable power supplies up to 430v ? electrostatic transducers & deflection description the pa85 is a high voltage, high power bandwidth mos - fet operational ampli?er designed for output currents up to 200ma. 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 con?guration. all internal biasing is referenced to a bootstrapped zener-mosfet current source. as a result, the pa85 features an unprecedented supply range and excellent supply rejection. the mosfet output stage is biased on for linear operation. external compensation provides user ?exibility. this hybrid circuit utilizes thick ?lm (cermet) resistors, ceramic capacitors and silicon semiconductor chips to maximize reli - ability, minimize size and give top performance. ultrasonically bonded aluminum wires provide reliable interconnections at all operating temperatures. the 8-pin to-3 package is hermeti - cally sealed and electrically isolated. the use of compressible isolation washers voids the warranty. equivalent schematic ? ? ? ? ? ? ? ? ???? ? ??? ?? ? ?? ? ? ?? ?? ?? ?? ?? ?? ?? ??? ???? ???? ? ?? ??? ??? ??? ??? ?? ??? ?? ??? ??? patented typical application dynamic focusing is the active correction of focusing voltage as a beam traverses the face of a crt. this is necessary in high resolution ?at face monitors since the distance between cathode and screen varies as the beam moves from the center of the screen to the edges. pa85 lends itself well to this function since it can be connected as a summing ampli?er with inputs from the nominal focus potential and the dynamic correction. the nominal might be derived from a potentiometer, or per - haps automatic focusing circuitry might be used to generate this potential. the dynamic correction is generated from the sweep voltages by calculating the distance of the beam from the center of the display. external connections ????????? ? ????? ? ? ??? ? ? ? ?? ????? ????? ???? ? ??? ?? ????? ??????? ?????? ??????? ?????? ?? ????? ???? ? ? ? ? ? ? ? ? ???????? ?? ??? ??? ??? ???? ??? ? ?? ??? ? ? ???? ? ? phase compensation gain c c r c 1 68pf 100 20 10pf 330 100 3.3pf 0 c c rated for full supply voltage ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ????????????????????????????????????????? ???????????? 8-pin to-3 package style ce
apex microtechnology corporation ? 5980 north shannon road ? tucson, arizona 85741 ? usa ? applications hotline: 1 (800) 546-2739 2 absolute maximum ratings specifications absolute maximum ratings supply voltage, +v s to Cv s 450v output current, continuous within soa 200ma power dissipation, continuous @ t c = 25c 2 30w input voltage, differential 25v input voltage, common mode v s temperature, pin solder - 10s max 300c temperature, junction 2 150c temperature, storage C65 to +150c operating temperature range, case C55 to +125c pa85 ? PA85A specifications pa85 PA85A 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 3 10 * * 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 10 100 3 30 pa input impedance, dc 10 11 * input capacitance 4 * pf common mode voltage range 4 v s C15 * v common mode rejection, dc v cm = 90v 90 110 * * db noise 100khz bw, r s = 1k, c c = 10pf 1 * vrms gain open loop, @ 15hz r l = 2k, c c = open 96 111 * * db gain bandwidth product at 1mhz r l = 2k, c c = 3.3pf 100 * mhz power bandwidth c c = 10pf 300 * khz c c = 3.3pf 500 * khz phase margin full temperature range 60 * output voltage swing 4 i o = 200ma vsC10 vsC6.5 * * v voltage swing 4 i o = 75ma vC8.5 vsC6.0 * * v voltage swing 4 i o = 20ma vC8.0 vsC5.5 * * v current, continuous t c = 85c 200 * ma slew rate, a v = 20 c c = 10pf 400 * v/s slew rate, a v = 100 c c = open 1000 700 * v/s capacitive load, a v = +1 full temperature range 470 * * pf settling time to .1% c c = 10pf, 2v step 1 * s resistance, no load r cl = 0 50 * power supply voltage 6 full temperature range 15 150 225 * * * v current, quiescent 21 25 * * ma thermal resistance, ac, junction to case 5 full temperature range, f > 60hz 2.5 * c/w resistance, dc, junction to case full temperature range, f < 60hz 4.2 * c/w resistance, junction to air full temperature range 30 * c/w temperature range, case meets full range speci?cations C25 +85 * * c notes: * the speci?cation of PA85A is identical to the speci? cation for pa85 in applicable column to the left. 1. unless otherwise noted: t c = 25c, compensation = c c = 68pf, r c = 100. dc input speci?cations 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. ratings apply only to output transistors. an additional 10w may be dissipated due to quiescent power. 3. doubles for every 10c of temperature increase. 4. +v s and Cv s 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 25c case. no derating needed above 25c case. the pa85 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
apex microtechnology corporation ? telephone (520) 690-8600 ? fax (520) 888-3329 ? orders (520) 690-8601 ? email prodlit@apexmicrotech.com 3 typical performance graphs pa85 ? PA85A ? ?? ?? ?? ??? ??? ??? ??????????????????? ? ????? ? ? ?? ?? ?????????????? ???????????? ???????????????????????????????? ??? ???????????????? ???? ??? ? ?????????????? ???????????? ???? ?? ??? ??? ???? ????????????????? ?????????????????????? ? ?????????? ?? ??? ????????????????? ??? ? ?? ??? ????????????????????? ?????????????????????? ?? ?? ?? ??? ? ??? ????????????????? ? ????? ? ? ? ?? ???????????????????? ? ? ???? ?? ????????????????? ?? ??? ??? ????????????????? ? ??? ?? ? ??? ??? ?? ??? ??? ????????????????? ?? ?? ??? ????????????????????? ??????????????????????????????? ?? ?? ??? ? ?? ????????????????? ?? ?? ??? ?????????????????????? ???????????????????????????????? ?? ??? ? ? ?? ?? ????????????????? ?? ???? ?? ??? ??? ????????????? ???????????????? ??? ????? ??? ??? ? ?? ?????????????????????????????? ? ????? ??? ????????? ????????????????? ??? ???? ?? ?? ?? ?? ????????????????? ???? ??????????????????? ??????????????? ??? ??? ???? ??? ?? ??? ? ??? ??? ??? ??????????????????????? ? ???? ??? ???? ????????????????? ??????????????????????????????? ? ???? ???? ???? ?? ? ?? ?? ??????????????????? ?? ? ? ?? ?? ? ? ?? ??? ??????????????????????????? ? ???? ? ???? ???? ?? ?? ?????????????? ?? ??? ?? ??? ??? ?? ??? ??? ???? ???? ??? ?? ??? ??? ?? ???? ??? ??? ???? ???? ? ? ??????? ??? ? ? ? ???????? ? ? ???????? ? ? ??????? ? ? ??????? ? ? ???????? ? ? ???????? ?? ?? ?? ??? ?? ?? ???? ??? ? ? ????? ? ? ?????? ? ? ??????? ? ? ?????? ??? ? ? ??????? ??? ? ? ???????? ? ? ??????? ? ? ??????? ? ? ?????? ?? ??? ???? ???? ? ? ??????? ? ? ??????? ? ? ???????? ??? ?? ??? ??? ? ? ??????? ? ? ????????
apex microtechnology corporation ? 5980 north shannon road ? tucson, arizona 85741 ? usa ? applications hotline: 1 (800) 546-2739 4 operating considerations pa85 ? PA85A 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. 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 1.4 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 30 ohms. .7 r cl = i lim - .016 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. input protection although the pa85 can withstand differential voltages up to 25v, additional external protection is recommended. since the pa85 is a high speed ampli?er, low leakage, low capaci - tance jfets connected as diodes are recommended (e.g. 2n4416, q1-q4 in figure 2). the differential input voltage will be clamped to 1.4v. this is suf?cient overdrive to produce maximum power bandwidth. power supply protection unidirectional zener diode transient suppressors 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. stability the pa85 is externally compensated and performance can be tailored to the application. use the graphs of small signal response and power response as a guide. the compensation capacitor c c must be rated at 500v working voltage. an npo capacitor is recommended. the compensation network c c r c must be mounted closely to the ampli?er pins 7 and 8 to avoid spurious oscillation. 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. pa85u rev m october 2003 ? 2003 apex microtechnology corp. ?? ? ??? ??? ?? ?? ? ? ? ? ???? ?? ?? ?? ? ?? ?? ????????? ??????????????????????
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