apex microtechnology corporation ?telephone (520) 690-8600 ?fax (520) 888-3329 ?orders (520) 690-8601 ?email prodlit@apexmicrotech.com features high voltage ?900v ( 450v) low quiescent current ?600 a high output current ?10ma applications mass spectrometers scanning coils high voltage instrumentation programmable power supplies up to 880v semiconductor measurement equipment description the PA97 is a high voltage mosfet operational amplifier designed as a low cost solution for driving continuous output currents up to 10ma and pulse currents to 15ma into capaci- tive loads. the safe operating area (soa) has no second breakdown limitations. the mosfet output stage is biased class c for low quiescent current operation. external compen- sation provides flexibility in choosing bandwidth and slew rate for the application. apex? sip05 package uses a minimum of board space allowing for high density circuit boards. equivalent schematic low power, piezoelectric positioning http://www.apexmicrotech.com (800) 546-apex (800) 546-2739 microtechnology high voltage power operational amplifier PA97 f r PA97 in r piezo drive s v s +v out v computer focus command voltage external connections package: sip05 typical application piezo positioning may be applied to the focusing of seg- mented mirror systems. the composite mirror may be com- posed of hundreds of elements, each requiring focusing under computer control. in such complex systems the PA97 reduces the costs of power supplies and cooling with its advantages of low cost and low quiescent power consumption while increas- ing circuit density with the sip package. q1 q2 r1 r2 c1 r3 q3 cc1 cc2 q6 q5 r5 r7 r8 q8 r10 r11 q9 r4 q4 q6 q7 out q10 r9 +v s in +in v s r6 12 1 2 10 8 6 4 phase compensation gain c c 10 10pf 12 4 6 8 10 12 ** * .01 f or greater ceramic power supply bypassing required. in +in cc1 cc2 out vs +vs c c * cc =10pf minimum, 1kv npo(cog) patent pending
apex microtechnology corporation 5980 north shannon road tucson, arizona 85741 usa applications hotline: 1 (800) 546-2739 absolute maximum ratings specifications absolute maximum ratings supply voltage, +v s to v s 900v output current, source, sink 15ma, within soa power dissipation, continuous @ t c = 25 c5w input voltage, differential 3 20v input voltage, common mode (see text) v s temperature, pin solder - 10s max 220 c temperature, junction 2 150 c temperature, storage 65 to +150 c operating temperature range, case 55 to +125 c PA97 specifications parameter test conditions 1 min typ max units input offset voltage, initial .5 5 mv offset voltage, vs. temperature full temperature range 10 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 4pf common mode voltage range 3 v s = 250v see note 3 v s 30 v common mode rejection, dc v cm = 90v 80 98 db noise 10khz bw, r s = 1k ? , c c = 10pf 2 vrms gain open loop, @ 15hz r l = 5k ? , c c = 10pf 94 111 db gain bandwidth product at 1mhz r l = 5k ? , c c = 10pf 1 mhz power bandwidth r l = 5k ? , c c = 10pf 2 khz phase margin, a v = 100 full temperature range 60 output voltage swing 3 i o = 10ma v s 24 v s 20 v current, continuous 10 ma slew rate, a v = 100 c c = 10pf 8 v/ s settling time to .1% c c = 10pf, 2v step 2 s resistance 10ma load 100 ? power supply voltage 5 see note 5 50 300 450 v current, quiescent, .6 1 ma thermal resistance, ac, junction to case 4 full temperature range, f > 60hz 20 c/w resistance, dc, junction to case full temperature range, f < 60hz 25 c/w resistance, junction to air full temperature range 40 c/w temperature range, case 25 +85 c notes: 1. unless otherwise noted: t c = 25 c, dc input specifications are value given. power supply voltage is typical rating. c c = 10pf. 2. long term operation at the maximum junction temperature will result in reduced product life. derate internal power dissipatio n to achieve high mttf. 3. although supply voltages can range up to 450v the input pins cannot swing over this range. the input pins must be at least 30v from either supply rail but not more than 500v from either supply rail. see text for a more complete description of the common mode voltage range. 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 25 c case. no derating needed above 25 c case. caution the PA97 is constructed from mosfet transistors. esd handling procedures must be observed.
apex microtechnology corporation telephone (520) 690-8600 fax (520) 888-3329 orders (520) 690-8601 email prodlit@apexmicrotech.com typical performance graphs PA97 temperature, t ( c) 1m .6m 2m 3m frequency, f (hz) phase response phase, ( ) 10 100 10k 1m frequency, f (hz) input noise voltage, v (nv/ hz) -120 -140 -160 -180 -200 -220 output current, i (ma) input noise 1k 2 7 10 20 3 5 15 n o voltage drop from supply, v v (v) so safe operating area 20 10 8 6 5 4 3 2 1 100 200 300 400 600 1000 c c =10pf output current from +v s or v s , (ma) 100 s dc,t c =25 c dc,t c =85 c dc,t c =125 c supply to output differential, v s v o (v) 1 10m frequency, f (hz) 0 60 120 140 small signal response open loop gain, a (db) 20 40 80 100 100 1k 10k .1m 1m 10 c = 10pf c 1.08 1.04 1.00 0.96 0.92 0.88 100 200 300 400 500 600 700 800 900 normalized quiescent current, i(x) total supply voltage, v s (v) quiescent current output voltage swing 14 13 12 11 10 9 0246810 power derating internal power dissipation, p(w) 5 4 3 2 1 0 0 25 50 75 100 125 150 swing from +v s swing from -v s 10k 30k frequency, f (hz) 50 1k 500 power response output voltage, v (v ) o p-p 100 1k c = 10pf c 200 s
operating considerations PA97 general please read the general operating considerations sec- tion, which covers stability, supplies, heatsinking, mounting, current limit, soa interpretation, and specification interpreta- tion. additional information can be found in the application notes. for information on the package outline, heatsinks, and mounting hardware, consult the accessory and package mechanical data section of the handbook. current limit the PA97 has no provision for current limiting the output. common mode input range operational amplifiers are usually designed to have a com- mon mode input voltage range that approximates the power supply voltage range. however, to keep the cost as low as possible and still meet the requirements of most applications the common mode input voltage range of the PA97 is re- stricted. the input pins must always be a least 30v from either supply voltage but never more than 500v. this means that the PA97 cannot be used in applications where the supply volt- ages are extremely unbalanced. for example, supply volt- ages of +800v and 100v would not be allowed in an applica- tion where the non-inverting pin is grounded because in normal operation both input pins would be at 0v and the difference voltage between the positive supply and the input pins would be 800v. in this kind of application, however, supply voltages +500v and -100v does meet the input common mode voltage range requirements since the maximum difference voltage between the inputs pins and the supply voltage is 500v (the maximum allowed). the output has no such restrictions on its voltage swing. the output can swing within 24v of either supply voltage regardless of value so long as the total supply voltage does not exceed 900v. input protection although the PA97 can withstand differential input voltages up to 20v, additional external protection is recommended. in most applications 1n4148 or 1n914 signal diodes are suffi- cient (d1, d2 in figure 2a). in more demanding applications where low leakage or low capacitance are of concern 2n4416 or 2n5457-2n5459 jfets connected as diodes will be re- quired (q1, q2 in figure 2b). in either case the input differential voltage will be clamped to .7v. this is sufficient overdrive to produce maximum power bandwidth. note that this protection does not automatically protect the amplifier from excessive common mode input voltages. 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 reversal as well as line regulation. conditions which can cause open circuits or polarity rever- sals 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 amplifier as possible. external components the compensation capacitor cc must be rated for the total supply voltage. 10pf npo (cog)capacitor rated at 1kv is recommended. of equal importance is the voltage rating and voltage coef- ficient of the gain setting feedback resistor. typical voltage ratings of low wattage resistors are 150 to 250v. up to 900 v can appear across the feedback resistor. high voltage rated resistors can be obtained. however a 1 megohm feedback resistor composed of five 200k resistors in series will produce the proper voltage rating. cautions the operating voltages of the PA97 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. with no internal current limit, proper choice of load impedance and supply voltage is required to meed soa limitiations. an output short circuit will destroy the amplifier within milliseconds. stability the PA97 is stable at gains of 10 or more with a npo (cog) compensation capacitor of 10pf. the compensation capaci- tor, cc, in the external connections diagram must be rated at 1000v working voltage and mounted closely to pins 4 and 6 to prevent spurious oscillation. a compensation capacitor less than 10pf is not recommended. this data sheet has been carefully checked and is believed to be reliable, however, no responsibility is assumed for possible i naccuracies or omissions. all specifications are subject to change without notice. PA97u rev. b august 2000 ? 2000 apex microtechnology corp. PA97 +v s in +in z1 z2 d2 d1 12 10 1 2 +v s in +in z1 z2 12 10 1 2 PA97 q1 q2 a. b. v s v s
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