apex microtechnology corporation ? telephone (520) 690-8600 ? fax (520) 888-3329 ? orders (520) 690-8601 ? email prodlit@apexmicrotech.com 1 ? ? ? ? ? ? ? ? ?? ?? ?? ?? ?? ?? ?? ??? ??? ??? ??? typical application figure 1. voltage-to-current conversion dc and low distortion ac current waveforms are delivered to a grounded load by using matched resistors (a and b sections) and taking advantage of the high common mode rejection of the pa10. foldover current limit is used to modify current limits based on output voltage. when load resistance drops to 0, the current is limited based on output voltage. when load resistance drops to 0, the current limit is 0.79a resulting in an internal dissipa - tion of 33.3 w. when output voltage increases to 36v, the current limit is 1.69a. refer to application note 9 on foldover limiting for details. external connections ? ? ??? ???? ???? ???? ???? ??? ??? ???? ??? ???? ????? ??????? features ? gain bandwidth product 4mhz ? temperature range C55 to +125c (PA10A) ? excellent linearity class a/b output ? wide supply range 10v to 50v ? high output current 5a peak applications ? motor, valve and actuator control ? magnetic deflection circuits up to 4a ? power transducers up to 100khz ? temperature control up to 180w ? programmable power supplies up to 90v ? audio amplifiers up to 60w rms description the pa10 and PA10A are high voltage, high output current operational ampli?ers designed to drive resistive, inductive and capacitive loads. for optimum linearity, the output stage is biased for class a/b operation. the safe operating area (soa) can be observed for all operating conditions by selec - tion of user programmable current limiting resistors. both ampli?ers are internally compensated for all gain settings. for continuous operation under load, a heatsink of proper rating is recommended. this hybrid integrated circuit utilizes thick ?lm (cermet) resistors, ceramic capacitors and semiconductor chips to maximize reliability, minimize size and give top performance. ultrasonically bonded aluminum wires provide reliable inter - connections at all operating temperatures. the 8-pin to-3 package is hermetically sealed and electrically isolated. the use of compressible isolation washers voids the warranty. equivalent schematic ??? ???? ??? ??? ???? ?? ??? ??? ? ? ???????? ? ??? ? ??? ?????? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ??????????????????????????? ???????????? 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 absolute maximum ratings specifications specifications absolute maximum ratings supply voltage, +v s to Cv s 100v output current, within soa 5a power dissipation, internal 67w 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 pa10 PA10A parameter test conditions 2, 5 min typ max min typ max units input offset voltage, initial t c = 25c 2 6 1 4 mv offset voltage, vs. temperature full 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 * vw bias current, initial t c = 25c 12 30 10 20 na bias current, vs. temperature full 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 full 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 full temperature range v s C5 v s C3 * * v common mode rejection, dc 3 full temp. range, v cm = v s C6v 74 100 * * db gain open loop gain at 10hz t c = 25c, 1k load 110 * db open loop gain at 10hz full temp. range, 15 load 96 108 * * db gain bandwidth product @ 1mhz t c = 25c, 15 load 4 * mhz power bandwidth t c = 25c, 15 load 10 15 * * khz phase margin full temp. range, 15 load 35 * output voltage swing 3 t c = 25c, i o = 5a v s C8 v s C5 v s C6 * v voltage swing 3 full temp. range, i o = 2a v s C6 * v voltage swing 3 full temp. range, i o = 80ma v s C5 * v current, peak t c = 25c 5 * a settling time to .1% t c = 25c, 2v step 2 * s slew rate t c = 25c 2 3 * * v/s capacitive load full temperature range, a v = 1 .68 * nf capacitive load full temperature range, a v = 2.5 10 * nf capacitive load full temperature range, a v > 10 soa * nf power supply voltage full temperature range 10 40 45 * * 50 v current, quiescent t c = 25c 8 15 30 * * * ma thermal resistance, ac, junction to case 4 t c = C55 to +125c, f > 60hz 1.9 2.1 * * c/w resistance, dc, junction to case t c = C55 to +125c 2.4 2.6 * * c/w resistance, junction to air t c = C55 to +125c 30 * c/w temperature range, case meets full range speci?cations C25 +85 C55 +125 c pa10 ? PA10A 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 notes: * the speci?cation of PA10A is identical to the speci? cation for pa10 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 tests is 40, unless otherwise 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. 5. full temperature range speci? cations are guaranteed but not tested.
apex microtechnology corporation ? telephone (520) 690-8600 ? fax (520) 888-3329 ? orders (520) 690-8601 ? email prodlit@apexmicrotech.com 3 typical performance graphs pa10 ? PA10A ? ??? ????????????????? ? ????????????????????? ??????????????????????????????? ?? ?? ??? ??? ?? ??? ?? ?? ?? ?? ??? ? ???????????? ?????????????? ????????????????? ? ???? ?? ? ? ? ? ?? ?? ?? ?? ?? ? ? ? ? ? ? ?? ????????? ? ???????? ? ?? ?? ?? ?? ??? ??? ??????????????????? ? ?? ?? ?? ?????????????? ???????????????????????????????? ?? ?? ??? ?? ?? ???? ????? ????? ? ????? ? ??? ??? ?? ??? ??????????????????? ? ????? ? ??? ????????????? ???????????????? ??? ???? ??? ? ?? ?? ??? ??? ?? ??? ? ?? ??????? ? ?? ??????? ??? ??? ??? ? ??? ?? ??? ??? ??? ???????????? ??? ?? ??? ?? ?? ?? ??? ?????????????????????????? ? ???? ??? ??? ??????????????????? ? ????? ??? ??? ??? ??? ????????????????? ??? ????????????????? ? ??? ?? ? ?????????????? ??? ??? ??? ?? ?? ?? ?? ?? ?? ??? ??? ? ???????? ? ???????? ? ? ??? ? ???????? ? ???????? ??? ? ???????? ? ????????? ?? ??? ??? ??? ????????????????? ?????????????????????? ? ?????????? ??????????? ?? ?? ?? ?? ?? ?? ?? ??? ??? ?? ?? ??? ????????????????? ???? ?? ? ??????????????????? ?????????????? ??? ?? ? ??? ??? ??? ??? ? ? ????? ? ? ????????? ? ? ????? ? ? ??????? ? ? ????? ? ? ?????? ?? ??? ??????????????????????? ? ???? ?? ?? ??? ????????????????? ??????????????????????????????? ? ???? ?? ??? ?? ?? ?? ?? ?? ??? ??? ? ? ???????? ? ? ??????? ? ? ??????? ? ? ???????? ? ? ? ????????????????? ? ???? ? ? ???????????????????? ????????????????????????????? ? ? ? ? ? ? ? ? ??????? ? ? ?????????????? ? ? ??????? ? ? ?????????????? ? ?? ? ?? ? ? ??? ??? ????????????????? ??? ? ?? ??? ????????????????????? ????????????????? ?? ????? ?? ?? ?? ??? ?? ?? ??? ??? ?? ? ??? ??? ??? ???? ???? ??? ? ?????????????? ??? ??? ?? ?? ??? ?? ????????????????? ??????? ????? ???? ??? ???? ????
apex microtechnology corporation ? 5980 north shannon road ? tucson, arizona 85741 ? usa ? applications hotline: 1 (800) 546-2739 4 operating considerations pa10 ? PA10A 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. safe operating area (soa) the output stage of most power ampli?ers has three 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 these limits. 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. 1. for dc outputs, especially those resulting from fault condi - tions, check worst case stress levels against the new soa graph. for sine wave outputs, use power design 1 to plot a load line. make sure the load line does not cross the 0.5ms limit and that excursions beyond any other second breakdown line do not exceed the time label, and have a duty cycle of no more than 10%. 1 note 1. power design is a self-extracting excel spread - sheet available free from www.apexmicrotech.com for other waveform outputs, manual load line plotting is recommended. applications note 22, soa and load lines, will be helpful. a spice type analysis can be very useful in that a hardware setup often calls for instruments or ampli?ers with wide common mode rejection ranges. 2. the ampli?er can handle any emf generating or reactive load and short circuits to the supply rail or shorts to com - mon 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 50v .21a .61a 40v .3a .87a 35v .36a 1.0a 30v .46a 1.4a 25v .61a 1.7a 20v .87a 2.2a 15v 1.4a 2.9a current limiting refer to application note 9, "current limiting", for details of both ?xed and foldover current limit operation. visit the apex web site at www.apexmicrotech.com for a copy of the power design spreadsheet (excel) which plots current limits vs. steady state soa. beware that current limit should be thought of as a +/C20% function initially and varies about 2:1 over the range of C55c to 125c. for ?xed current limit, leave pin 7 open and use equations 1 and 2. r cl = 0.65/l cl (1) i cl = 0.65/r cl (2) where: i cl is the current limit in amperes. r cl is the current limit resistor in ohms. for certain applications, foldover current limit adds a slope to the current limit which allows more power to be delivered to the load without violating the soa. for maximum foldover slope, ground pin 7 and use equations 3 and 4. 0.65 + (vo * 0.014) i cl = (3) r cl 0.65 + (vo * 0.014) r cl = (4) i cl where: vo is the output voltage in volts. most designers start with either equation 1 to set r cl for the desired current at 0v out, or with equation 4 to set r cl at the maximum output voltage. equation 3 should then be used to plot the resulting foldover limits on the soa graph. if equa - tion 3 results in a negative current limit, foldover slope must be reduced. this can happen when the output voltage is the opposite polarity of the supply conducting the current. in applications where a reduced foldover slope is desired, this can be achieved by adding a resistor (r fo ) between pin 7 and ground. use equations 4 and 5 with this new resistor in the circuit. 0.65 + vo * 0.14 10.14 + r fo i cl = (5) r cl 0.65 + vo * 0.14 10.14 + r fo r cl = (6) i cl where: r fo is in k ohms. 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. pa10u rev o october 2004 ? 2004 apex microtechnology corp.
|
