apex microtechnology corporation ?telephone (520) 690-8600 ?fax (520) 888-3329 ?orders (520) 690-8601 ?email prodlit@apexmicrotech.com features surface mount package monolithic mos technology low cost high voltage operation?50v low quiescent current?ma no second breakdown high output current?20 ma peak applications telephone ring generator piezo electric positioning electrostatic transducer & deflection deformable mirror focusing description the PA44 is a high voltage monolithic mosfet operational amplifier 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 PA44 is packaged in apex's psop1 non-hermetic surface mountable dual in line package. the metal back of the package is tied to ?s. the PA44 is set for a gain of 38.5 boosting the 2.33v signal to 90v. the recommended compensation for gains above 30 is used. if capacitive loading is at least 330pf at all times, the recommended snubber network may be omitted. the 27 ohm resistor sets current limit to a nominal value of 111ma to insure peak currents out of at least 78ma. telephone ring generator phase compensation gain c c r c 1 18pf 2.2k ? 10 10pf 2.2k ? 30 3.3pf 2.2k ? external connections equivalent schematic typical application http://www.apexmicrotech.com (800) 546-apex (800) 546-2739 microtechnology high voltage power operational amplifier PA44 ?n out +v s ? s +in d2 d3 d4 d5 q5 q4 5 7 12 21 15 13 q1 q11 q12 d1 q2 q6 q8 q13 sub q14 q10 q9 q7 q3 i lim comp comp 19 17 top view out comp comp 100 ? 13 15 17 19 21 12 15 7 ?n nc +in ? s +v s c c r c r c l r s i lim * 330pf c s * * supply bypassing required. see general operating considerations. mur120 in6300a .22 27 100 330pf 2.2k 3.3pf .22 100k 2.67k 2.5k + 15 10k 10k icl8038 11 10 8 7 2 6 5 4 PA44 mur130 in6300a 90vrms 82k * 140v ?40v ?5v * 1.5 f @ 16hz 1.2 f @ 20hz 15v mur120 mur130
apex microtechnology corporation ?5980 north shannon road ?tucson, arizona 85741 ?usa ?applications hotline: 1 (800) 546-2739 parameter test conditions 1 min typ max units input offset voltage, initial 4 15 30 mv offset voltage, vs. temperature 4 full temperature range 70 130 v/ c offset voltage, vs supply 20 32 v/v offset voltage, vs time 75 v kh bias current, initial 50 200 pa bias current, vs supply 22 0 pa/v offset current, initial 50 200 pa input impedance, dc 10 11 ? input capacitance 5pf common mode, voltage range v s ?2 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 ?2 v s ?0 v current, peak 5 120 ma current, continuous 60 ma settling time to .1% c c = 10pf, 10v step, a v = ?0 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 ma thermal resistance, ac junction to case f > 60hz 6 7 c/w resistance, dc junction to case f < 60hz 9 11 c/w resistance, junction to air full temperature range 25 c/w temperature range, case meets full range specifications ?5 +85 c absolute maximum ratings specifications p a44 absolute maximum ratings supply voltage, +v s to ? s 350v output current, continuous within soa 60 ma output current, peak 120 ma power dissipation, continuous @ t c = 25 c 12w input voltage, differential 16 v input voltage, common mode v s temperature, pin solder ?10 sec 220 c temperature, junction 2 150 c temperature, storage ?5 to +150 c temperature range, powered (case) ?0 to +125 c caution the PA44 is constructed from mosfet transistors. esd handling procedures must be observed. specifications notes: 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. 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. PA44
apex microtechnology corporation ?telephone (520) 690-8600 ?fax (520) 888-3329 ?orders (520) 690-8601 ?email prodlit@apexmicrotech.com typical performance graphs p a44 current limit resistor, r cl ( ? ) ? 025507 5 100 125 temperature, t ( c) 0 3 6 power derating internal power dissipation, p(w) ?0 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) ?0 0 60 120 small signal response open loop gain, a(db) 20 40 80 100 1 100 .1m 10m ?10 ?50 ?0 0 phase response ?0 ?0 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 ?0 40 current limit current limit range, i (ma) 20 10 10k .1m 20 120 0 quiescent current 200 50 70 90 1k ?5 25 50 75 120 15 power response pp 30k 10 100 1k 10k .1m 80 100 200 ?0 ?0 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 t = t 125 +i lim 500 60 case temperature, t ( c) c ?80 ?20 110 130 150 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 ? 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 ? s t = t a c 25 c out ?5 c +out 85 c out ?5 c out 85 c +out 25 c +out 14 16 18
apex microtechnology corporation ?5980 north shannon road ?tucson, arizona 85741 ?usa ?applications hotline: 1 (800) 546-2739 operating considerations p a44 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? 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 PA44 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 PA44 has sufficient phase margin when compensated for unity gain to be stable with capacitive loads of at least 10 nf. however, the low pass circuit created by the sumpoint (?n) 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 1k 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 com- bination should match the time constant of the sumpoint resistance and sumpoint capacitance. the PA44 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 oscillation. 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 ? 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 PA44 soa 200ms 120 200 heatsinking the PA44 package has a large exposed integrated copper heatslug to which the monolithic amplifier is directly attached. the solder connection of the heatslug to a minimum 1 square inch foil area of the printed circuit board will result in thermal performance of 25 c/w junction to air rating of the PA44. solder connection to an area of 1 to 2 square inches of foil is recommended. this may be adequate heatsinking but the large number of variables involved suggest temperature mea- surements be made on the top of the package. do not allow the temperature to exceed 85 c. the heatslug is tied internally to ?s. 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. PA44u rev. e august 2001 ? 2001 apex microtechnology corp.
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