apex microtechnology corporation ? telephone (520) 690-8600 ? fax (520) 888-3329 ? orders (520) 690-8601 ? email prodlit@apexmicrotech.com 1 features ? high voltage 400v (200v) ? low quiescent current 10ma ? high output current 4a ? programmable current limit applications ? piezoelectric positioning ? high voltage instrumentation ? electrostatic transducers ? programmable power supplies up to 390v description the PA92 is a high voltage, low quiescent current mosfet operational ampli?er designed as a low cost solution for driving continuous output currents up to 4a and pulse currents up to 7a. the safe operating area (soa) has no second breakdown limitations and can be observed for all type loads by choosing an appropriate current limiting resistor. the mosfet output stage is biased ab for linear operation. external compensation provides ?exibility in choosing bandwidth and slew rate for the application. apexs power sip package uses a minimum of board space allowing for high density circuit boards. the power sip package is electrically isolated. equivalent schematic ?? ?? ?? ?? ?? ?? ?? ??? ?? ?? ? ? ? ? ? ?? ? ? ? ??? ? ?? ?? ?? ?? ?? ??? ? ?? ??? ??? ??? ?? ?? ?? ?? ???? ??? ??? ??? ??? ??? ?? ? ??? ??? ?? ? ? ? ?? ???? ???? typical application low power, piezoelectric positioning piezo positioning may be applied to the focusing of segment - ed mirror systems. the composite mirror may be composed of hundreds of elements, each requiring focusing under computer control. in such complex systems the PA92 reduces the costs of power supplies and cooling with its advantages of low cost and low quiescent power consumption while increasing circuit density with the sip package. phase compensation gain cc* rc 1 150pf 100 2 100pf 100 3 47pf 0 12 10pf 0 *cc never to be <10pf. cc to be rated for the full supply voltage +v to -vs. use ceramic npo (cog) type. external connections ? ? ???? ?? ? ? ? ? ??? ???? ????? ??????????? ? ?? ? ?? ??? ? ???????? ????? ??????? ??????? ?? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ????????????????????????????????????????? ???? ? ? ? ? ? ? ? ? ? ?? ??? ??? ? ?? ?? ? ?? ? ??????? ???????????? ?? ?? ? ? ? ? ? ? ??????????? ????????????????????? ? ? patented 12-pin sip package style dp formed leads availablewith package styles ed & ee
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 400v output current, source, sink, peak 7a, within soa power dissipation, continuous @ t c = 25c 80w input voltage, differential 20v input voltage, common mode v s temperature, pin solder - 10s max. 260c temperature, junction 2 150c temperature range, storage C40 to +85c operating temperature range, case C25 to +85c PA92 specifications parameter test conditions 1 min typ max units input offset voltage, initial 2 10 mv offset voltage, vs. temperature full temperature range 15 50 v/c offset voltage, vs. supply 10 25 v/v offset voltage, vs. time 75 v/kh bias current, initial 200 2000 pa bias current, vs. supply 4 pa/v offset current, initial 50 500 pa input impedance, dc 10 11 input capacitance 4 pf common mode voltage range 3 v s 15 v common mode rejection, dc v cm = 90v 80 98 db noise 100khz bw, r s = 1k, c c = 10pf 1 vrms gain open loop, @ 15hz r l = 2k, c c = 10pf 94 111 db gain bandwidth product at 1mhz r l = 2k, c c = 10pf 18 mhz power bandwidth r l = 2k, c c = 10pf 30 khz phase margin full temperature range 60 output voltage swing 3 i o = 4a v s 12 v s 10 v current, continuous 4 a slew rate, a v = 100 c c = 10pf 50 v/s capacitive load, a v = +1 full temperature range 1 nf settling time to .1% c c = 10pf, 2v step 1 s resistance, no load 10 power supply voltage 5 see note 5 50 150 200 v current, quiescent, 10 14 ma thermal resistance, ac, junction to case 4 full temperature range, f > 60hz 1 c/w resistance, dc, junction to case full temperature range, f < 60hz 1.5 c/w resistance, junction to air full temperature range 30 c/w temperature range, case meets full range speci?cations C25 +85 c notes: 1. unless otherwise noted: t c = 25c, dc input speci?cations are value given. power supply voltage is typical rating. r c = 100 c c = 150pf. 2. long term operation at the maximum junction temperature will result in reduced product life. derate internal power dissipation to achieve high mttf. 3. +v s and Cv s denote the positive and negative power supply rail respectively. 4. rating applies if the output current alternates between both output transistors at a rate faster than 60hz. 5. derate max supply rating .625 v/c below 25c case. no derating needed above 25c case. caution the PA92 is constructed from mosfet transistors. esd handling procedures must be observed. the exposed substrate contains beryllia (beo). do not crush, machine, or subject to temperatures in excess of 850c to avoid generating toxic fumes.
apex microtechnology corporation ? telephone (520) 690-8600 ? fax (520) 888-3329 ? orders (520) 690-8601 ? email prodlit@apexmicrotech.com 3 typical performance graphs PA92 ??????????????????? ??? ?? ??? ???? ???????????????? ??? ?? ?????????????? ???????????? ?? ??? ??? ???? ????????????????? ?????????????????????????????? ???? ????????????????? ??? ? ?? ????????????????????? ?????????????????????? ?? ?? ?? ?? ? ? ? ????????????????? ? ???? ??? ???????????????????? ??? ??? ??? ??? ??? ??? ??? ??? ????????????????? ?? ???? ? ? ? ????????????? ???????????????? ??? ???? ? ? ?? ?????????????????????????????? ? ????? ? ????????? ????????????????? ? ? ? ? ??? ??? ????????????????? ??????????????? ?? ?? ??? ??????????????????? ? ????? ??? ???????????????????????????? ??????????????????????????????? ? ???? ??? ??? ??? ??????????????????? ?? ? ? ?? ?? ? ? ?? ? ??????????????????????????? ? ???? ? ???? ??? ?? ???? ?? ??? ??? ??? ??? ??? ??? ? ??? ?? ?? ?? ?? ? ?? ?? ??? ?? ?? ??? ? ? ???????? ? ? ???????? ? ? ??????? ? ? ??????? ? ? ???????? ? ? ???????? ? ? ??????? ? ? ??????? ? ?? ?? ?? ??? ??? ??????????????????? ? ????? ? ?? ?? ?????????????? ???????????????????????????????? ?? ?? ? ? ?????? ? ? ?????? ? ? ????? ?????????????? ????????????????? ????????????????? ? ?? ??? ? ??? ???? ?? ?? ??? ??? ? ? ??????? ? ? ??????? ? ? ???????? ? ? ???????? ?? ??? ??
apex microtechnology corporation ? 5980 north shannon road ? tucson, arizona 85741 ? usa ? applications hotline: 1 (800) 546-2739 4 operating considerations PA92 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. current limit for proper operation, the current limit resistor (r cl ) must be connected as shown in the external connection diagram. 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 16 ohms. .65 r cl = i lim 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 ?y - back. 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 addi - tional internal power dissipation the ampli?er can tolerate when it produces the necessary output to drive an external load. input protection although the PA92 can withstand differential voltages up to 20v, additional external protection is recommended. low leakage, low capacitance jfets connected as diodes are recommended (e.g. 2n4416, q1-q4 in figure 2). the differ - ential 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. see figure 2. 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 sup - ply 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 PA92 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 4 and 5 to avoid spurious oscillation. quiescent current reduction when pin 3 (i q ) is shorted to pin 5 (cc2) the ab biasing of the output stage is disabled. this lowers quiescent power but also raises distortion since the output stage is then class c biased. the output stage bias current is nominally set at 1ma. pin 3 may be left open if not used. ???????????????????????????????? ? ??? ? ???? ?? ?? ?? ?? ?? ??? ??? ??? ??? ?????????????????????? ? ?????? ? ????? ??? ?? ?? ??? ??? ?? ?? ?? ?? ? ? ? ? ? ?? ? ??????? ? ? ?????? ????? ?? ????? ????? ? ?????? ??? ?? ? ??? ??? ?? ?? ?????? ???? ? ? ? ???? ?? ?? ?? ? ?? ?? ????????? ??????????? ?????????? 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. PA92u rev h october 2004 ? 2004 apex microtechnology corp.
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