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PA91 Datasheet(PDF) 4 Page - Cirrus Logic |
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PA91 Datasheet(HTML) 4 Page - Cirrus Logic |
4 / 6 page PA91 4 PA91U P r o d u c t I n n o v a t i o n F r o m ® TYPICAL APPLICATION LOW POWER, PIEZOELECTRIC POSITIONING Piezopositioningmaybeappliedtothefocusingofseg- mented mirror systems. The composite mirror may be composedofhundredsofelements,eachrequiringfocus- ingundercomputercontrol.Insuchcomplexsystemsthe PA91 reduces the costs of power supplies and cooling withitsadvantagesoflowcostandlowquiescentpower consumptionwhileincreasingcircuitdensitywiththeSIP package. GENERAL PleasereadApplicationNote1"GeneralOperatingConsiderations"whichcoversstability,supplies,heatsinking, mounting,currentlimit,SOAinterpretation,andspecificationinterpretation.Visitwww.cirrus.comfordesigntools thathelpautomatetaskssuchascalculationsforstability,internalpowerdissipation,currentlimit;heatsinkselec- tion;ApexPrecisionPower’scompleteApplicationNoteslibrary;TechnicalSeminarWorkbook;andEvaluationKits. CURRENT LIMIT Forproperoperation,thecurrentlimitresistor(R CL)mustbeconnectedasshownintheexternalconnectiondia- gram.Foroptimumreliabilitytheresistorvalueshouldbesetashighaspossible.Thevalueiscalculatedasfollows; withthemaximumpracticalvalueof32ohms. .65 R CL= I LIM 10 HARMONIC DISTORTION 100K 100 1K 10K 100k FREQUENCY F (Hz) 135 90 PHASE RESPONSE 10 100 10K 100K FREQUENCY, F (Hz) 100K FREQUENCY, F (Hz) –10 0 30 SMALL SIGNAL RESPONSE 10 20 40 50 0 0.15 0.2 OUTPUT CURRENT, I O (A) 5 6 OUTPUT VOLTAGE SWING 4.5 4 5.5 0 8 12 20 24 RESISTOR VALUE, R CL (Ω) 0 .05 .2 CURRENT LIMIT .1 .15 0.1 EXT. COMPENSATION CAPACITOR, C C (pF) 10 SLEW RATE 50 40 30 20 1K 10 100 FREQUENCY, F (Hz) 1 25 50 100 CASE TEMPERATURE, T C (°C) 1.1 NORMALIZED QUIES. CURRENT 1.0 4 16 INPUT NOISE VOLTAGE 1K 2 7 10 20 5 3 15 .05 225 75 .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 C C = 68 pF C C = 10 pF C C = 4.7 pF C C = OPEN C C = 68 pF C C = 10 pF C C = 4.7 pF C C = OPEN 0 25 50 75 100 125 150 CASE TEMPERATURE, T C (°C) 0 8 24 32 POWER DERATING 16 40 R L = 1KΩ V S = 200V A V = 63 P O = 5W P O = 1W P O = 17.6W OUTPUT STAGE POWER RESPONSE FREQUENCY, F (Hz) 10K 100K 1M 50 60 70 80 90 100 200 300 500 400 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 GAIN C C* R C ≥1 68pF 100Ω ≥5 10pF 100Ω ≥10 4.7pF 0Ω ≥30 NONE 0Ω *C CToberatedforthefullsupplyvoltage+VSto–VS. UseNPOceramic(COG)type. |
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