apex microtechnology corporation ?telephone (520) 690-8600 ?fax (520) 888-3329 ?orders (520) 690-8601 ?email prodlit@apexmicrotech.com features monolithic mos technology low cost high voltage operation?50v low quiescent current?ma no second breakdown high output current?20 ma peak available in die form?a41die applications piezo electric positioning electrostatic transducer & deflection deformable mirror focusing biochemistry stimulators computer to vacuum tube interface description the PA41/42 are high voltage monolithic mosfet opera- tional amplifiers achieving performance features previously found only in hybrid designs while increasing reliability. inputs are protected from excessive common mode and differential mode voltages. the safe operating area (soa) has no second breakdown limitations and can be observed with all type loads by choosing an appropriate current limiting resistor. external compensation provides the user flexibility in choosing optimum gain and bandwidth for the application. the PA41 is packaged in a hermetically sealed to-3 and all circuitry is isolated from the case by an aluminum nitride (aln) substrate. the pa42 is packaged in apex? hermetic ceramic sip10 package. equivalent schematic typical application note: PA41 recommended mounting torque is 4-7 in?bs (.45 -.79 n?) caution: the use of compressible, thermally conductive insulators may void warranty. low cost 660v p-p piezo drive two PA41/42 amplifiers operated as a bridge driver for a piezo transducer provides a low cost 660 volt total drive capa- bility. the r n c n network serves to raise the apparent gain of a2 at high frequencies. if r n is set equal to r the amplifiers can be compensated identically and will have matching bandwidths. external connections top view 1 2 3 4 5 6 7 8 out i lim v s +v s comp in +in c , c are npo rated for full supply voltage. = 3 comp c c 100 ? 330pf r c r cl r cl i lim s c s c r s phase compensation gain c c r c 1 18pf 2.2k ? 10 10pf 2.2k ? 30 3.3pf 2.2k ? PA41 pa42 r cl c c 100 ? 1 234 56 78 910 in +in nc v s c c i lim c s c c r c out nc 330pf +v s top view r s a1 PA41/42 a2 PA41/42 20r piezo transducer 20r rn 20r cn r v in 175 +175 175 +175 r cl r cl 180 180 2.2k 10pf 10pf 330pf 330pf 100 ? 100 ? 2.2k 4 7 in out +v s v s 1 8 6 +in 5 d2 d3 d4 d5 q5 q4 q1 q11 q12 d1 q2 q6 q8 q13 q14 q10 q9 q7 q3 i lim 2 comp 3 comp (5) (10) (7) (6) (8) (9) (2) (1) 5 (1) PA41 pin number pa42 pin number http://www.apexmicrotech.com (800) 546-apex (800) 546-2739 microtechnology high voltage power operational amplifiers PA41/pa42 ?PA41a/pa42a
apex microtechnology corporation 5980 north shannon road tucson, arizona 85741 usa applications hotline: 1 (800) 546-2739 absolute maximum ratings specifications PA41/pa42 PA41a/pa42a absolute maximum ratings supply voltage, +v s to v s 350v 350v output current, continuous within soa 60 ma 60 ma output current, peak 120 ma 120 ma power dissipation, continuous @ t c = 25 c 12w 9w input voltage, differential 16 v 16 v input voltage, common mode v s v s temperature, pin solder 10 sec 300 c 220 c temperature, junction 2 150 c 150 c temperature, storage 65 to +150 c 65 to +150 c temperature range, powered (case) 40 to +125 c 40 to +125 c caution the PA41/pa42 is constructed from mosfet transistors. esd handling procedures must be observed. parameter test conditions 1 min typ max min typ max units input offset voltage, initial 25 40 15 30 mv offset voltage, vs. temperature 4, 7 full temperature range 70 130 40/* 65/* v/ c offset voltage, vs supply 20 32 * * v/v offset voltage, vs time 75 * v kh bias current, initial 7 5/100 50/2000 **pa bias current, vs supply .2/.5 .5/50 * * pa/v offset current, initial 7 2.5/100 50/400 * * pa input impedance, dc 10 11 * ? input capacitance 5 * pf common mode, voltage range v s 12 * v common mode rejection, dc v cm = 90v dc 84 94 * * db noise, broad band 10khz bw, r s = 1k ? 50 * v rms noise, low frequency 1-10 hz 110 * v p-p gain open loop at 15hz r l = 5k ? 94 106 * * db bandwidth, open loop 1.6 * mhz power bandwidth c c = 10pf, 280v p-p 26 * khz phase margin full temperature range 60 * output voltage swing i o = 40ma v s 12 v s 10 v s 10 v s 8.5 v current, peak 5 120 * ma current, continuous 60 * ma settling time to .1% c c = 10pf, 10v step, a v = 10 12 * s slew rate c c = open 40 * v/ s capacitive load a v = +1 10 * nf resistance 6 , no load r cl = 0 150 * ? resistance 6 , 20ma load r cl = 0 25 * ? power supply voltage 3 see note 3 50 150 175 * * * v current, quiescent 1.6 2.0 .9 1.4 1.8 ma thermal PA41 resistance, ac junction to case f > 60hz 5.4 6.5 * * c/w pa42 resistance, ac junction to case f > 60hz 7 10 * * c/w PA41 resistance, dc junction to case f < 60hz 9 10.4 * * c/w pa42 resistance, dc junction to case f < 60hz 12 14 * * c/w PA41 resistance, junction to air full temperature range 30 * c/w pa42 resistance, junction to air full temperature range 55 * c/w temperature range, case meets full range specifications 25 +85 * * c specifications notes: * the specification for PA41a/pa42a is identical to the specification for PA41/pa42 in applicable column to the left. 1. unless otherwise noted t c = 25 c, c c = 18pf, r c = 2.2k ? . dc input specifications 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 dissipatio n to achieve high mttf. for guidance, refer to heatsink data sheet. 3. derate maximum supply voltage .5 v/ c below case temperature of 25 c. no derating is needed above t c = 25 c. 4. sample tested by wafer to 95%. 5. guaranteed but not tested. 6. the selected value of r cl must be added to the values given for total output resistance. 7. specifications separated by / indicate values for the PA41 and pa42 respectively. PA41/pa42 PA41a/pa42a PA41/PA41a pa42/pa42a
apex microtechnology corporation telephone (520) 690-8600 fax (520) 888-3329 orders (520) 690-8601 email prodlit@apexmicrotech.com typical performance graphs PA41/pa42 PA41a/pa42a current limit resistor, r cl ( ) ? 0 25 50 75 100 125 temperature, t ( c) 0 3 6 power derating internal power dissipation, p(w) 50 0 100 80 100 130 140 current limit 110 90 100 150 300 350 total supply voltage, v s (v) normalized quiescent current, (%) 1 100 10m frequency, f (hz) 20 0 60 120 small signal response open loop gain, a(db) 20 40 80 100 1 100 .1m 10m 210 150 60 0 phase response 90 30 10k 20k .2m .1m frequency, f (hz) 20 output voltage, v (v ) o 1 100 1k 1m frequency, f (hz) 0 80 120 common mode rejection common mode rejection, cmr (db) 20 60 100 11m frequency, f (hz) 0 20 120 power supply rejection power supply rejection, psr (db) 40 100 04060 output current, i o (ma) 2 10 output voltage swing voltage drop from supply, v s v o (v) 4 8 100 10k frequency, f (hz) .002 harmonic distortion distortion, (%) .02 1.0 30k 200 1k 0 compensation capacitance, c c (pf) slew rate slew rate, v/s 0 300 400 60 40 current limit current limit range, i (ma) 20 10 10k .1m 20 120 0 quiescent current 200 50 70 90 1k 25 25 50 75 120 15 power response pp 30k 10 100 1k 10k .1m 80 100 200 40 20 0 10 1k 10k .1m 1m 9 12 10 10k 1m frequency, f (hz) phase, ( ) ? normalized current limit, (%) 0 3k 100k .004 .04 420 816 12 10 20 30 40 50 60 40 60 80 100 200 400 40 80 60 PA41 t = t 125 +i lim 500 60 case temperature, t ( c) c 180 120 110 130 150 6 -i lim c c = 18pf c c = 10pf c c = 3.3pf c c = 18pf c c = 18pf c c = 10pf c c = 3.3pf c c = 3.3pf c c = 10pf 50k .3m .5m 1m c c = 10pf c c = 3.3pf c c = 18pf r l = 10k ? .006 .01 .06 .1 .2 .4 .6 i lim +i lim 250 t c = -25 c t c = 25 c t c = 85 c 12 100 v o = 180v pp v o = 60v pp v o = 30v pp a v = 20 c c = 3.3pf r l = 2k ? +v s v s t = t t = t c a t = t a pa42 c 25 c out 25 c +out 85 c out 25 c out 85 c +o ut 25 c +out 14 16 18
operating considerations PA41/pa42 PA41a/pa42a general please read application note 1 "general operating consid- erations" which covers stability, supplies, heat sinking, mount- ing, current limit, soa interpretation, and specification inter- pretation. visit www.apexmicrotech.com for design tools that help automate tasks such as calculations for stability, internal power dissipation, current limit; heat sink selection; apex s complete application notes library; technical seminar work- book; and evaluation kits. 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 18 ohms, however for optimum reliability the resistor value should be set as high as possible. the value can be estimated as follows with the maximum practical value of 500 ohms. 3 r cl = i lim use the typical performance graphs as a guide for expected variations in current limit value with a given r cl and variations over temperature. the selected value of r cl must be added to the specified typical value of output resistance to calculate the total output resistance. since the load current passes through r cl the value selected also affects the output voltage swing according to: v r = i o r cl where v r is the voltage swing reduction. when the amplifier is current limiting, there may be small signal spurious oscillation present during the current limited portion of the negative half cycle. the frequency of the oscil- lation is not predictable and depends on the compensation, gain of the amplifier, and load. the oscillation will cease as the amplifier comes out of current limit. input protection the PA41/42 inputs are protected against common mode voltages up the supply rails and differential voltages up to 16 volts as well as static discharge. differential voltages exceed- ing 16 volts will be clipped by the protection circuitry. however, if more than a few milliamps of current is available from the overload source, the protection circuitry could be destroyed. the protection circuitry includes 300 ohm current limiting resistors at each input, but this may be insufficient for severe overloads. it may be necessary to add external resistors to the application circuit where severe overload conditions are ex- pected. limiting input current to 1ma will prevent damage. stability the PA41/42 has sufficient phase margin when compen- sated for unity gain to be stable with capacitive loads of at least 10 nf. however, the low pass circuit created by the sumpoint ( in) capacitance and the feedback network may add phase shift and cause instabilities. as a general rule, the sumpoint load resistance (input and feedback resistors in parallel) should be 5k ohm or less at low gain settings (up to 10). alternatively, use a bypass capacitor across the feedback resistor. the time constant of the feedback resistor and bypass capacitor combination should match the time constant of the sumpoint resistance and sumpoint capacitance. the PA41/42 is externally compensated and performance can be tailored to the application. use the graphs of small signal gain and phase response as well as the graphs for slew rate and power response as a guide. the compensation capacitor c c must be rated at 350v working voltage. the compensation capacitor and associated resistor r c must be mounted closely to the amplifier pins to avoid spurious oscilla- tion. an npo capacitor is recommended for compensation. safe operating area (soa) the mosfet output stage of this power operational ampli- fier has two distinct limitations: 1. the current handling capability of the die metallization. 2. the temperature of the output mosfets. note: the output stage is protected against transient flyback. however, for protection against sustained, high en- ergy flyback, external fast-recovery diodes should be used. * supply to output differential, v s -v o (v) 10 20 30 50 100 200 300 500 output current from +v s or v s , (ma) 2 3 4 5 10 20 30 40 50 100 dc, t c = 125 c dc, t c = 85 c dc pulse curves @ 10% duty cycle max pa42 soa supply to output differential, v s -v o (v) 10 20 30 50 100 200 300 500 output current from +v s or v s , (ma) 2 3 4 5 10 20 30 40 50 100 dc, t c = 125 c dc, t c = 85 c dc 300ms pulse curves @ 10% duty cycle max PA41 soa 200ms 120 200 100ms 200ms 300ms 120 200 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. PA41/42u rev. g january 1999 ? 1999 apex microtechnology corp.
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