apex microtechnology corporation ? telephone (520) 690-8600 ? fax (520) 888-3329 ? orders (520) 690-8601 ? email prodlit@apexmicrotech.com 1 features ? wide supply range 10 to 45v ? high output current 10a peak ? low cost class c output stage ? low quiescent current 3ma applications ? programmable power supply ? motor/syncro driver ? valve and actuator control ? dc or ac power regulator ? fixed frequency power oscillator description the pa61 and PA61A are high output current operational ampli?ers designed to drive resistive, inductive and capaci - tive loads. their complementary emitter follower output stage is the simple class c type and optimized for low frequency applications where crossover distortion is not critical. these ampli?ers are not recommended for audio, transducer or de?ection coil drive circuits above 1khz or when distortion is critical. the safe operating area (soa) is fully speci?ed and can be observed for all operating conditions by selection of user programmable current limiting resistors. both ampli?ers are internally compensated for all gain settings. for continu - ous operation under load, mounting on a heatsink of proper rating is recommended. this hybrid circuit utilizes thick ?lm conductors, ceramic capacitors, and semiconductor chips to maximize reliabil - ity, minimize size, and give top performance. ultrasonically bonded aluminum wires provide reliable interconnections at all operating temperatures. the 8-pin to-3 package is electri - cally isolated and hermetically sealed. the use of compres- sible thermal washers and/or improper mounting torque voids the product warranty. please see general operating considerations. equivalent schematic ???????? ? ? ? ? ? ? ? ? ? ?? ?? ? ??? ??? ?? ? ??? ???? ? ?? ? ??? ? ??? ?????? ???? ???? ? ??? ? ???? ? ???? ? ? ???? ? ? ??? ? ? ?? ? ??? ? ? ???????? ? ?? ? ???? ???????? ???? ??? ? ??? ? ??? ??? ???????????????????????????????????? ??????????????????? ? ? ? ? ? ? ? ?? ? ?? ? ?? ?? ? ??? ? ??? ? ??? ? ??? typical application due to its high current drive capability, pa61 applications often utilize remote sensing to compensate ir drops in the wir - ing. the importance of remote sensing increases as accuracy requirements, output currents, and distance between ampli - ?er and load go up. the circuit above shows wire resistance from the pa61 to the load and back to the local ground via the power return line. without remote sensing, a 7.5a load current across only 0.05 ohm in each line would produce a 0.75v error at the load. with the addition of the second ratio matched r f /r in pair and two low current sense wires, ir drops in the power return line become common mode voltages for which the op amp has a very high rejection ratio. voltage drops in the output and power return wires are inside the feedback loop. therefore, as long as the power op amp has the voltage drive capability to overcome the ir losses, accuracy remains the same. applica - tion note 7 presents a general discussion of pps circuits. external connections ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ???????????????????????????? ???????????? 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 pa61 PA61A parameter test conditions 2 min typ max min typ max units input offset voltage, initial t c = 25c 2 6 1 4 mv offset voltage, vs. temperature speci?ed temperature range 10 65 * 40 v/c offset voltage, vs. supply t c = 25c 30 200 * * v/v offset voltage, vs. power t c = 25c 20 * v/w bias current, initial t c = 25c 12 30 10 20 na bias current, vs. temperature speci?ed temperature range 50 500 * * pa/c bias current, vs. supply t c = 25c 10 * pa/v offset current, initial t c = 25c 12 30 5 10 na offset current, vs. temperature speci?ed temperature range 50 * pa/c input impedance, dc t c = 25c 200 * m input capacitance t c = 25c 3 * pf common mode voltage range 3 speci?ed temperature range v s C5 v s C3 * * v common mode rejection, dc 3 speci?ed temperature range 74 100 * * db gain open loop gain at 10hz full temp. range, full load 96 108 * * db gain bandwidth product at 1mhz t c = 25c, full load 1 * mhz power bandwidth t c = 25c, i o = 8a, v o = 40v pp 10 16 * * khz phase margin full temperature range 45 * output voltage swing 3 t c = 25c, i o = 10a v s C7 v s C5 v s C6 * v voltage swing 3 full temp. range, i o = 4a v s C6 v s C4 * * v voltage swing 3 full temp. range, i o = 68ma v s C5 * v current t c = 25c 10 * a settling time to .1% t c = 25c, 2v step 2 * s slew rate t c = 25c, r l = 6? 1.0 2.8 * * v/s capacitive load, unit gain full temperature range 1.5 * nf capacitive load, gain>4 full temperature range soa * power supply voltage full temperature range 10 32 45 * * * v current, quiescent t c = 25c 3 10 * * ma thermal resistance, ac, junction to case 4 f > 60hz 1.0 1.2 * * c/w resistance, dc, junction to case f < 60hz 1.5 1.8 * * c/w resistance, junction to air 30 * c/w temperature range, case meets full range speci?cation C25 25 +85 * * * c absolute maximum ratings specifications specifications absolute maximum ratings supply voltage, +v s to Cv s 90v output current, within soa 10a power dissipation, internal 97w input voltage, differential v s C3v input voltage, common mode v s temperature, pin solder-10s 300c temperature, junction 1 200c temperature range, storage C65 to +150c operating temperature range, case C55 to +125c pa61 ? PA61A notes: * the speci?cation of PA61A is identical to the speci? cation for pa61 in applicable column to the left. 1. long term operation at the maximum junction temperature will result in reduced product life. derate internal power dissipation to achieve high mttf. 2. the power supply voltage for all speci? cations is the typ rating unless noted as a test condition. 3. +v s and Cv s denote the positive and negative supply rail respectively. total v s is measured from +v s to Cv s . 4. rating applies if the output current alternates between both output transistors at a rate faster than 60hz. 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 pa61 ? PA61A ? ?? ?? ?? ??? ??? ??? ?????????????? ? ????? ? ?? ?? ??? ?????????????? ????????????????????????????????? ??? ? ??? ?? ??? ??? ???????????? ??? ?? ?? ??? ??? ??? ????????????????? ?????????????????????? ?? ????????? ? ??? ??? ????????????????? ??? ? ?? ??? ????????????????????? ????????????????? ?? ????? ?? ?? ?? ??? ? ??? ??? ??? ???? ???? ??? ? ?????????????? ??? ??? ????????????????? ????????????????? ? ??? ??? ? ????????????????? ??????????????????? ??????????????? ?? ??????????????????????? ? ???? ?? ?? ??? ????????????????? ??????????????????????????????? ? ???? ?? ??? ? ??? ????????????????? ? ????????????????????? ??????????????????????????????? ?? ?? ??? ??? ?? ??? ??? ?? ??? ??????????????????? ? ????? ? ? ????????????? ???????????????? ??? ???? ? ??????????? ?? ?? ?? ?? ?? ??? ?? ?? ?? ??? ?? ?????????????? ?? ?? ?? ?? ?? ??? ? ?? ?? ? ? ?? ?? ??? ??? ?? ?? ?? ??? ?? ????????????????? ???????????? ?????????????????????????? ? ???? ? ? ?? ?? ?? ?? ??? ??? ??? ??? ??? ? ??????????????????? ? ????? ???? ???? ?? ?? ?? ??? ??? ?? ?? ? ?????????????????? ? ???? ???????????????????? ???????????????????????????? ??? ? ? ? ? ?? ??? ??? ??? ??? ??? ??? ? ???????????? ?????????????? ????????????????? ? ???? ?? ? ? ? ? ?? ?? ?? ?? ?? ? ? ? ? ? ?? ?? ?? ??????????? ?? ?? ??????? ? ? ?????????????? ? ? ???????? ????? ? ?? ?? ?? ?? ?? ?? ?? ??? ??? ??? ??? ??? ??? ? ? ? ????? ? ? ????? ? ? ??????? ? ? ????? ? ? ????? ? ? ?? ?? ?? ?? ??? ?? ??? ??? ??? ??? ??? ?? ? ? ?????? ? ? ????? ? ? ????? ? ? ????? ? ? ?????? ? ? ?????? ? ? ???????? ? ? ??????? ? ? ????????
apex microtechnology corporation ? 5980 north shannon road ? tucson, arizona 85741 ? usa ? applications hotline: 1 (800) 546-2739 4 operating considerations pa61 ? PA61A 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. safe operating area (soa) the output stage of most power ampli?ers has 3 distinct limitations: 1. the current handling capability of the transistor geometry and the wire bonds. 2. the second breakdown effect which occurs whenever the simultaneous collector current and collector-emitter voltage exceeds speci?ed limits. 3. the junction temperature of the output transistors. the soa curves combine the effect of all limits for this power op amp. for a given application, the direction and magnitude of the output current should be calculated or measured and checked against the soa curves. this is simple for resistive loads but more complex for reactive and emf generating loads. the following guidelines may save extensive analyti - cal efforts. 1. under transient conditions, capacitive and dynamic* induc - tive loads up to the following maximum are safe: capacitive load inductive load v s i lim = 5a i lim = 10a i lim = 5a i lim = 10a 45v 200 f 150 f 8mh 2.8mh 40v 400 f 200 f 11mh 4.3mh 35v 800 f 400 f 20mh 5.0mh 30v 1600 f 800 f 35mh 6.2mh 25v 5.0mf 2.5mf 50mh 15mh 20v 10mf 5.0mf 400mh 20mh 15v 20mf 10mf ** 100mh * if the inductive load is driven near steady state conditions, allowing the output voltage to drop more than 8v below the supply rail with i lim = 10a or 15v below the supply rail with i lim = 5a while the ampli?er is current limiting, the inductor should be capacitively coupled or the current limit must be lowered to meet soa criteria. ** second breakdown effect imposes no limitation but thermal limitations must still be observed. 2. the ampli?er can handle any emf generating or reactive load and short circuits to the supply rail or shorts to common if the current limits are set as follows at t c =85c. short to v s short to v s c, l, or emf load common 45v 0.1a 1.3a 40v 0.2a 1.5a 35v 0.3a 1.6a 30v 0.5a 2.0a 25v 1.2a 2.4a 20v 1.5a 3.0a 15v 2.0a 4.0a these simpli?ed limits may be exceeded with further analysis using the operating conditions for a speci?c application. 3. the output stage is protected against transient ?yback. however, for protection against sustained, high energy ?yback, external fast-recovery diodes should be 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. pa61u rev i october 2003 ? 2003 apex microtechnology corp.
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