apex microtechnology corporation ? telephone (520) 690-8600 ? fax (520) 888-3329 ? orders (520) 690-8601 ? email prodlit@apexmicrotech.com PA05a usa beo d te949311 features ? high internal dissipation 250 watts ? high voltage, high current 100v, 30a ? high slew rate 100v/ m s ? 4 wire current limit sensing ? low distortion ? external shutdown control ? optional boost voltage inputs ? evaluation kit see ek04 applications ? linear and rotary motor drives ? sonar transducer driver ? yoke/magnetic field excitation ? programmable power supplies to 45v ? audio up to 500w description the PA05 is a high voltage mosfet power operational amplifier that extends the performance limits of power ampli- fiers in slew rate and power bandwidth, while maintaining high current and power dissipation ratings. the PA05 is a highly flexible amplifier. the shutdown control feature allows the output stage to be turned off for standby operation or load protection during fault conditions. boost voltage inputs allow the small signal portion of the amplifier to operate at a higher voltage than the high current output stage. the amplifier is then biased to achieve close linear swings to the supply rails at high currents for extra efficient operation. external compensation tailors slew rate and bandwidth perfor- mance to user needs. a four wire sense technique allows precision current limiting without the need to consider internal or external milliohm parasitic resistance in the output line. the output stage is protected by thermal limiting circuits above junction temperatures of 175 c. equivalent schematic 12 9 5 6 8 10 shutdown +v boost ?n ? boost +in +vs i lim i lim out ?s bias 7 4 3 comp 2 1 11 q12 q13 q1 q8 q4 q5 q10 q16 q17 q22 q14 q18 q24 q21 q25 q29 q30 q33 d1 d6 d9 d5 d19 d20 d27 d31 d4 control logic ultra- sonic drive r f r i 1 12 2 10 11 r cl tuned transformer PA05 7 typical application the high power bandwidth of the PA05 allows driving sonar transducers via a resonant circuit including the transducer and a matching transformer. the load circuit appears resistive to the PA05. control logic turns off the amplifier's output during shutdown. external connections phase compensation gain c c r c 1 470pf 120 w >3 220pf 120 w 3 10 82pf 120 w c c rated for full supply voltage *see boost operation paragraph. top view ?nput +input shutdown current limit current limit c c r c 1 2 3 4 5 6 12 11 10 9 8 7 top view comp ? boost ?upply +v boost +supply output * * comp the jedec mo-127 12-pin power dip? package (see package outlines) is hermetically sealed and isolated from the internal circuits. the use of compressible thermal washers and/or improper mounting torque will void the product war- ranty. please see general operating considerations. http://www.apexmicrotech.com (800) 546-apex (800) 546-2739 microtechnology power operational amplifiers PA05 ?PA05a
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 Cv s 100v boost voltage supply voltage +20v output current, continuous within soa 30a power dissipation, internal 250w input voltage, differential 20v input voltage, common mode v b temperature, pin solder - 10s 300 c temperature, junction 2 175 c temperature, storage C65 to +150 c operating temperature range, case C55 to +125 c PA05 ? PA05a specifications PA05a PA05 the PA05 is constructed from mosfet transistors. esd handling procedures must be observed. 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 850 c to avoid generating toxic fumes. caution notes: * the specification of PA05a is identical to the specification for PA05 in applicable column to the left. 1. unless otherwise noted: t c = 25 c, c c = 470pf, r c = 120 ohms. dc input specifications are value given. power supply voltage is typical rating. v boost = v s . 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 the heatsink data sheet. 3. rating applies if the output current alternates between both output transistors at a rate faster than 60 hz. 4. the PA05 must be used with a heatsink or the quiescent power may drive the unit to junction temperatures higher than 150 c. parameter test conditions 1 min typ max min typ max units input offset voltage, initial 5 10 2 5 mv offset voltage, vs. temperature full temperature range 20 50 10 30 m v/ c offset voltage, vs. supply 10 30 * * m v/v offset voltage, vs. power full temperature range 30 10 m v/w bias current, initial 10 50 5 20 pa bias current, vs. supply .01 * pa/v offset current, initial 10 50 5 20 pa input impedance, dc 10 11 * w input capacitance 13 * pf common mode voltage range full temperature range v b C8 * v common mode rejection, dc full temp. range, v cm = 20v 90 100 * * db input noise 100khz bw, r s = 1k w 10 * m vrms gain open loop, @ 15hz full temperature range, c c = 82pf 94 102 * * db gain bandwidth product r l = 10 w 3 * mhz power bandwidth r l = 4 w , v o = 80v p-p , a v = C10 400 * khz c c = 82pf, r c = 120 w phase margin full temperature range, c c = 470pf 60 * output voltage swing i o = 20a v s C9.5 v s C8.7 * * v voltage swing v boost = vs + 5v, i o = 30a v s C5.8 v s C5.0 * * v current, peak 30 * a settling time to .1% a v = +1, 10v step, r l = 4 w 2.5 * m s slew rate a v = C10, c c = 82pf, r c = 120 w 80 100 * v/ m s capacitive load full temperature range, a v = +1 2.2 * nf resistance i o = 0, no load, 2mhz 5 * w i o = 1a, 2mhz 2 * w power supply voltage full temperature range 15 45 50 * * * v current, quiescent, boost supply 46 56 * * ma current, quiescent, total 90 120 * * ma current, quiescent, total, shutdown 46 56 * * ma thermal resistance, ac, junction to case 3 full temperature range, f>60hz .3 .4 * * c/w resistance, dc, junction to case full temperature range, f<60hz .4 .5 * * c/w resistance, junction to air 4 full temperature range 12 * c/w temperature range, case meets full range specification C25 85 * * c
apex microtechnology corporation ? telephone (520) 690-8600 ? fax (520) 888-3329 ? orders (520) 690-8601 ? email prodlit@apexmicrotech.com typical performance graphs PA05 ? PA05a 0 25 50 75 100 125 150 case temperature, t(?) 0 100 200 power derating internal power dissipation, p(w) 100 1k 10m frequency f (hz) 0 power supply rejection power supply rejection, psr (db) ?0 0 75 125 case temperature, t (?) normalized current limit, (%) 100 10m frequency, f (hz) 0 20 60 100 small signal response open loop gain, a(db) 40 80 frequency, f (hz) ?25 phase response 0 5 20 30 2 voltage drop from supply, v s ? o (v) 30 300 30k frequency, f (hz) .001 .02 .2 harmonic distortion distortion, thd (%) .002 .01 .1 20 100 total supply voltage, v (v) .8 .9 1.2 quiescent current normalized quiescent current, i (x) 1.0 1.1 40k .4m 4m frequency, f (hz) 2 power response output voltage, v (v pp ) o 10 frequency, f (hz) 0 common mode rejection common mode rejection, cmr (db) 60 80 100 1m 100 1k 0 10 15 time, t (?) ? 0 pulse response output voltage, v (v) 30 520 100 200 ext. compensation capacitor c (pf) 20 100 slew rate vs. comp. slew rate, sr (v/?) 80 c 100 1k 3k 10k 25 current limit 50 60 70 10 10k 100k 1m 150 250 output voltage swing 15 40 60 80 40 60 ?.5 10 1k 10k 100k 1m 20 40 60 80 100 300 400 500 phase, (? f 100 10m 10 1k 10k 100k 1m ?80 ?35 ?0 ?5 0 4 6 8 10 12 output current, i (a) o 10k 100k ?.5 2.5 5 7.5 o a = +1 ?5 25 100 80 90 100 110 120 130 c .005 .05 a = 10 r = 2 c = 82pf, r = 120 ?s = 31v c l w c q s c = 470pf c v p = 200w o o p = 1w o v w p = 300w 40 20 50 r = 8 r = 120 l w c w c c = 82pf c c = 220pf c c = 470pf c c = 470pf c c = 220pf c c = 82pf 4 6 10 20 40 60 100 c = 82pf c c = 470pf c c = 220pf c r = 8 r = 120 l w c w c c = 82pf c c = 220pf c c = 470pf v = v s boost v = v s + 5v boost 10 25 100k 1m
operating considerations PA05 ? PA05a general please read the general operating considerations section, which covers stability, supplies, heatsinking, mounting, cur- rent limit, soa interpretation, and specification interpretation. additional information can be found in the application notes. for information on the package outline, heatsinks, and mount- ing hardware, consult the accessory and package mechanical data section of the handbook. the ek04 evaluation kit makes prototype circuits a snap by providing an ek04pc proto circuit board, ms05 mating socket, hs11 heatsink and hardware kit. current limit the two current limit sense lines are to be connected directly across the current limit sense resistor. for the current limit to work correctly, pin 11 must be connected to the amplifier output side and pin 10 connected to the load side of the current limit resistor, r cl , as shown in figure 1. this connection will bypass any parasitic resistances, r p formed by sockets and solder joints as well as internal amplifier losses. the current limiting resistor may not be placed anywhere in the output circuit except where shown in figure 1. if current limiting is not used, pins 10 and 11 must be tied to pin 7. the value of the current limit resistor can be calculated as follows: 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 mosfet geometry and the wire bonds. 2. the junction temperature of the output mosfets. note: the output stage is protected against transient flyback. however, for protection against sustained, high energy flyback, external fast-recovery diodes should be used. shutdown operation to disable the output stage, pin 12 is connected to ground via relay contacts or via an electronic switch. the switching device must be capable of sinking 2ma to complete shutdown and capable of standing off the supply voltage +v s . see figure 2 for suggested circuits. from an internal circuitry standpoint, shutdown is just a special case of current limit where the allowed output current is zero. as with current limit, however, a small current does flow in the output during shutdown. a load impedance of 100 ohms or less is required to insure the output transistors are turned off. note that even though the output transistors are off the output pin is not open circuited because of the shutdown operating current. boost operation with the v boost feature, the small signal stages of the amplifier are operated at higher supply voltages than the amplifiers high current output stage. +v boost (pin 9), and Cv boost (pin 5) are connected to the small signal circuitry of the amplifier. +v s (pin 8) and Cv s (pin 6) are connected to the high current output stage. an additional 5v on the v boost pins is sufficient to allow the small signal stages to drive the output transistors into saturation and improve the output voltage swing for extra efficient operation when required. when close swings to the supply rails is not required the +v boost and +v s pins must be strapped together as well as the Cv boost and Cv s pins. the boost voltage pins must not be at a voltage lower than the v s pins. compensation the external compensation components c c and r c are connected to pins 3 and 4. unity gain stability can be achieved at any compensation capacitance greater than 470 pf with at least 60 degrees of phase margin. at higher gains, more phase shift can be tolerated in most designs and the compensation capacitance can accordingly be reduced, resulting in higher bandwidth and slew rate. use the typical operating curves as a guide to select c c and r c for the application. 1 supply to output differential ( v ) output current (a) 2510 30 100 .3 .6 .9 1.2 1.5 3 6 9 12 15 30 dc tc = 125? dc tc = 85? dc tc = 25? t = 200ms 34 20 40 50 i limit = .7/r cl r i 1 2 10 11 r cl PA05 r p r l cl cl input 7 r f figure 1. current limit ?ogic k1 shutdown 470 w q1 figure 2. shutdown operation 12 12 shutdown ?ogic a b 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. PA05u rev. f december 1997 ? 1997 apex microtechnology corp.
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