apex microtechnology corporation ?telephone (520) 690-8600 ?fax (520) 888-3329 ?orders (520) 690-8601 ?email prodlit@apexmicrotech.com features high voltage ?450v ( 225v) low quiescent current ?10ma high output current ?200ma programmable current limit high slew rate ?300v/ s applications piezoelectric positioning high voltage instrumentation electrostatic transducers programmable power supplies up to 440v description the PA91 is a high voltage, low quiescent current mosfet operational amplifier designed for driving continuous output currents up to 200ma and pulse currents up to 350ma. the safe operating area (soa) has no second breakdown limita- tions and can be observed for all type loads by choosing an appropriate current limiting resistor. the mosfet output stage is biased ab for linear operation. external compensation provides flexibility in choosing bandwidth and slew rate for the application. apex? power sip package uses a minimum of board space allowing for high density circuit boards. equivalent schematic q1 q2 r1 r2 c1 r3 q3 cc1 12 11 1 4 5 9 6 10 2 7 8 cc2 3 q6 q5 r5 r8 r9 q15 r11 r12 q16 q12 q8 r4 r7 q4 ilim out q14 r10 q13 q11 +v s in +in v s i q r6 low power, piezoelectric positioning typical application piezo positioning may be applied to the focusing of seg- mented mirror systems. the composite mirror may be com- posed of hundreds of elements, each requiring focusing under computer control. in such complex systems the PA91 reduces the costs of power supplies and cooling with its advantages of low cost and low quiescent power consumption while increas- ing circuit density with the sip package. f r PA91 in r 1 2 6 7,8 9,10 11,12 piezo drive s v s +v out v computer focus command voltage cl r phase compensation external connections package: sip03 gain c c *r c 1 68pf 100 ? 100 ? 0 ? 0 ? 10pf 4.7pf none 5 10 30 *c c to be rated for the full supply voltage +v to vs. use npo ceramic (cog) type. 1 234 56 78 910 in +in r cl +v s v s to load and feedback 11 12 r c c c * * (see text.) * bypassing required. i q http://www.apexmicrotech.com (800) 546-apex (800) 546-2739 microtechnology PA91 high voltage power operational amplifier
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 v s 450v output current, source, sink, peak 350ma, within soa power dissipation, continuous @ t c = 25 c 30w input voltage, differential 20v input voltage, common mode v s temperature, pin solder - 10s max 220 c temperature, junction 2 150 c temperature, storage 65 to +150 c operating temperature range, case 55 to +125 c PA91 specifications parameter test conditions 1 min typ max units input offset voltage, initial .5 2 mv offset voltage, vs. temperature full temperature range 15 50 v/ c offset voltage, vs. supply 10 25 v/v offset voltage, vs. time 75 v/ kh bias current, initial 200 2000 pa bias current, vs. supply 4 pa/v offset current, initial 50 500 pa input impedance, dc 10 11 ? input capacitance 4pf common mode voltage range 3 v s 15 v common mode rejection, dc v cm = 90v 80 98 db noise 100khz bw, r s = 1k ? , c c = open 1 vrms gain open loop, @ 15hz r l = 2k ? , c c = open 94 111 db gain bandwidth product at 1mhz r l = 2k ? , c c = open 100 mhz power bandwidth r l = 2k ? , c c = open 470 khz phase margin full temperature range 60 output voltage swing 3 i o = 200ma v s 12 v s 10 v current, continuous 200 ma slew rate, a v = 100 c c = open 240 300 v/ s capacitive load, a v = +1 full temperature range 470 pf settling time to .1% c c = open, 2v step 1 s resistance, no load 50 ? power supply voltage 5 see note 5 40 150 225 v current, quiescent, 10 14 ma thermal resistance, ac, junction to case 4 full temperature range, f > 60hz 2.5 c/w resistance, dc, junction to case full temperature range, f < 60hz 4.2 c/w resistance, junction to air full temperature range 30 c/w temperature range, case meets full range specifications 25 +85 c notes: 1. unless otherwise noted: t c = 25 c, dc input specifications are value given. power supply voltage is typical rating. r c = 100 c c = 68pf. 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. +v s and v s denote the positive and negative power supply rail respectively. 4. rating applies if the output current alternates between both output transistors at a rate faster than 60hz. 5. derate max supply rating .625 v/ c below 25 c case. no derating needed above 25 c case. caution the PA91 is constructed from mosfet transistors. esd handling procedures must be observed.
apex microtechnology corporation telephone (520) 690-8600 fax (520) 888-3329 orders (520) 690-8601 email prodlit@apexmicrotech.com typical performance graphs PA91 10 harmonic distortion 100k 100 1k 10k 100k frequency f (hz) 135 90 phase response phase, ( ) 10 100 10k 100k frequency, f (hz) input noise voltage, v (nv hz) 100k frequency, f (hz) 10 0 30 small signal response open loop gain, a (db) 10 20 40 50 0 0.15 0.2 output current, i (a) 5 6 output voltage swing 4.5 4 5.5 0 8 12 20 24 resistor value, r ( ) 0 .05 .2 current limit current limit, ii (a) lim .1 .15 0.1 ext. compensation capacitor, c (pf) 10 slew rate slew rate, (v/ s) 50 40 30 20 1k 10 100 frequency, f (hz) distortion, (%) 1 25 50 100 case temperature, tc ( c) 1.1 normalized quies. current normalized quiescent current, i (x) q 1.0 cl 416 input noise voltage 1k 2 7 10 20 5 3 15 n o .05 voltage drop from supply, v v (v) so 225 75 c ? .001 1m 10m 270 180 125 1.2 1.3 0.1 3.5 700 300 200 100 70 500 1 .01 .1 1m 10m cc = 68 pf cc = 10 pf cc = 4.7 pf cc = open cc = 68 pf cc = 10 pf cc = 4.7 pf cc = open 0 25 50 75 100 125 150 case temperature, t ( c) 0 8 24 32 power derating internal power dissipation, p(w) 16 40 c s v r l = 1k v = 200v a = 63 p = 5w o p = 1w o p = 17.6w o output stage power response frequency, f (hz) output voltage vo, (vp p) 1e+004 1e+005 1e+006 50 60 70 80 90 100 200 300 500 400 cc = open cc = 4.7pf cc = 10pf cc = 68pf
apex microtechnology corporation 5980 north shannon road tucson, arizona 85741 usa applications hotline: 1 (800) 546-2739 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. PA91u rev. a september 2000 ? 2000 apex microtechnology corp. operating considerations PA91 supply to output differential, v s v o (v) 25 50 75 100 250 500 output current from +v s or v s , (ma) 10 20 30 50 100 200 300 500 dc, t c = 125 c dc, t c = 85 c 200ms pulse curves @ 10% duty cycle max dc, t c = 25 c 100ms 125 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. for optimum reliability the resistor value should be set as high as possible. the value is calculated as follows; with the maximum practical value of 32 ohms. .65 r cl = i lim 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. safe operating curves the safe operating area curves define the maximum addi- tional internal power dissipation the amplifier can tolerate when it produces the necessary output to drive an external load. input protection although the PA91 can withstand differential voltages up to 20v, additional external protection is recommended. low leakage, low capacitance jfets connected as diodes are recommended (e.g. 2n4416, q1-q4 in figure 2). the differen- tial input voltage will be clamped to 1.4v. this is sufficient overdrive to produce maximum power bandwidth. power supply protection unidirectional zener diode transient suppressors are recom- mended as protection on the supply pins. see figure 2. the zeners clamp transients to voltages within the power supply rating and also clamp power supply reversals to ground. whether the zeners are used or not, the system power supply should be evaluated for transient performance including power- on overshoot and power-off polarity reversals as well as line regulation. conditions which can cause open circuits or polarity rever- sals on either power supply rail should be avoided or protected against. reversals or opens on the negative supply rail is known to induce input stage failure. unidirectional transzorbs prevent this, and it is desirable that they be both electrically and physically as close to the amplifier as possible. stability the PA91 is externally compensated and performance can be tailored to the application. use the graphs of small signal response and power response as a guide. the compensation capacitor c c must be rated at 500v working voltage. an npo capacitor is recommended. the compensation network c c r c must be mounted closely to the amplifier pins 4 and 5 to avoid spurious oscillation. quiescent current reduction when pin 3 (i q ) is shorted to pin 5 (cc2) the ab biasing of the output stage is disabled. this lowers quiescent power but also raises distortion since the output stage is then class c biased. the output stage bias current is nominally set at 1ma. pin 3 may be left open if not used. +v s in +in z1 z2 11, 12 7, 8 1 2 6 PA91 q1 q2 v s q3 q4 figure 2. overvoltage protection
|
