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| www..com HIGH VOLTAGE POWER OPERATIONAL AMPLIFIERS PA41/PA42 * PA41A/PA42A MICROTECHNOLOGY HTTP://WWW.APEXMICROTECH.COM (800) 546-APEX (800) 546-2739 FEATURES * * * * * * * MONOLITHIC MOS TECHNOLOGY LOW COST HIGH VOLTAGE OPERATION--350V LOW QUIESCENT CURRENT--2mA NO SECOND BREAKDOWN HIGH OUTPUT CURRENT--120 mA PEAK AVAILABLE IN DIE FORM--PA41DIE TYPICAL APPLICATION R V IN 20R +175 2.2K 10pF A1 PA41/42 R CL 10pF A2 PA41/42 2.2K 20R 20R +175 APPLICATIONS * * * * * PIEZO ELECTRIC POSITIONING ELECTROSTATIC TRANSDUCER & DEFLECTION DEFORMABLE MIRROR FOCUSING BIOCHEMISTRY STIMULATORS COMPUTER TO VACUUM TUBE INTERFACE R CL Rn Cn DESCRIPTION The PA41/42 are high voltage monolithic MOSFET operational amplifiers achieving performance features previously found only in hybrid designs while increasing reliability. Inputs are protected from excessive common mode and differential mode voltages. The safe operating area (SOA) has no second breakdown limitations and can be observed with all type loads by choosing an appropriate current limiting resistor. External compensation provides the user flexibility in choosing optimum gain and bandwidth for the application. The PA41 is packaged in a hermetically sealed TO-3 and all circuitry is isolated from the case by an aluminum nitride (AlN) substrate. The PA42 is packaged in APEX's hermetic ceramic SIP10 package. PIEZO 180 TRANSDUCER 180 100 100 330pF 330pF -175 LOW COST 660V p-p PIEZO DRIVE -175 Two PA41/42 amplifiers operated as a bridge driver for a piezo transducer provides a low cost 660 volt total drive capability. The RN CN network serves to raise the apparent gain of A2 at high frequencies. If RN is set equal to R the amplifiers can be compensated identically and will have matching bandwidths. EXTERNAL CONNECTIONS R CL RC COMP 3 CC 2 COMP 1 PHASE COMPENSATION I LIM EQUIVALENT SCHEMATIC D1 Q1 Q2 Q3 Q4 (1) 5 -IN D2 (2) 6 +IN Q11 Q12 Q13 D3 D4 D5 Q5 (8) 2 Q6 COMP COMP Q8 (9) 3 Q7 4 (10) OUT I LIM 1 (7) 8 (6) +VS OUT 4 Gain 1 10 30 CS 330pF CC 18pF 10pF 3.3pF RC 2.2K 2.2K 2.2K TOP VIEW 5 -IN 6 8 PA41 PA42 +IN -VS 7 +VS RS 100 C S , C C ARE NPO RATED FOR FULL SUPPLY VOLTAGE. R CL = 3 I LIM TOP VIEW 1 2 3 NC 4 5 6 +VS I LIM RS 100 CS 330pf 7 8 CC RC 9 CC 10 OUT Q9 NC -VS Q10 -IN Q14 -VS 7 (5) +IN CC RCL 5 PA41 PIN NUMBER NOTE: PA41 Recommended mounting torque is 4-7 in*lbs (.45 -.79 N*m) CAUTION: The use of compressible, thermally conductive insulators may void warranty. (1) PA42 PIN NUMBER APEX MICROTECHNOLOGY CORPORATION * TELEPHONE (520) 690-8600 * FAX (520) 888-3329 * ORDERS (520) 690-8601 * EMAIL prodlit@apexmicrotech.com PA41/PA42 * PA41A/PA42A ABSOLUTE MAXIMUM RATINGS ABSOLUTE MAXIMUM RATINGS SPECIFICATIONS PA41/PA41A PA42/PA42A SUPPLY VOLTAGE, +VS to -VS 350V 350V OUTPUT CURRENT, continuous within SOA 60 mA 60 mA OUTPUT CURRENT, peak 120 mA 120 mA POWER DISSIPATION, continuous @ TC = 25C 12W 9W INPUT VOLTAGE, differential 16 V 16 V INPUT VOLTAGE, common mode VS VS TEMPERATURE, pin solder - 10 sec 300C 220C TEMPERATURE, junction2 150C 150C TEMPERATURE, storage -65 to +150C -65 to +150C TEMPERATURE RANGE, powered (case) -40 to +125C -40 to +125C PA41/PA42 TEST CONDITIONS1 MIN TYP MAX PA41A/PA42A MIN TYP 15 40/* * * * * * * * * * * * * * * * * MAX 30 65/* * * * * UNITS mV V/C V/V V kh pA pA/V pA pF V dB V RMS V p-p dB MHz kHz V mA mA s V/s nF * 1.8 * * * * * V mA C/W C/W C/W C/W C/W C/W C SPECIFICATIONS PARAMETER INPUT OFFSET VOLTAGE, initial OFFSET VOLTAGE, vs. temperature4, 7 OFFSET VOLTAGE, vs supply OFFSET VOLTAGE, vs time BIAS CURRENT, initial 7 BIAS CURRENT, vs supply OFFSET CURRENT, initial 7 INPUT IMPEDANCE, DC INPUT CAPACITANCE COMMON MODE, voltage range COMMON MODE REJECTION, DC NOISE, broad band NOISE, low frequency GAIN OPEN LOOP at 15Hz BANDWIDTH, open loop POWER BANDWIDTH PHASE MARGIN OUTPUT VOLTAGE SWING CURRENT, peak5 CURRENT, continuous SETTLING TIME to .1% SLEW RATE CAPACITIVE LOAD RESISTANCE 6, no load RESISTANCE 6, 20mA load POWER SUPPLY VOLTAGE3 CURRENT, quiescent THERMAL PA41 RESISTANCE, AC junction to case PA42 RESISTANCE, AC junction to case PA41 RESISTANCE, DC junction to case PA42 RESISTANCE, DC junction to case PA41 RESISTANCE, junction to air PA42 RESISTANCE, junction to air TEMPERATURE RANGE, case NOTES: * 1. 2. 3. 4. 5. 6. 7. Full temperature range VCM = 90V DC 10kHz BW, RS = 1K 1-10 Hz RL = 5K CC = 10pf, 280V p-p Full temperature range IO = 40mA CC = 10pF, 10V step, AV = -10 CC = OPEN AV = +1 RCL = 0 RCL = 0 See Note 3 VS-12 84 25 40 70 130 20 32 75 5/100 50/2000 .2/.5 .5/50 2.5/100 50/400 1011 5 94 50 110 106 1.6 26 60 94 * VS-12 VS-10 120 60 12 40 10 150 25 50 150 1.6 5.4 7 9 12 30 55 -25 175 2.0 6.5 10 10.4 14 +85 VS-10 VS-8.5 * * * * * * * * .9 * 1.4 * * * * * * * F > 60Hz F > 60Hz F < 60Hz F < 60Hz Full temperature range Full temperature range Meets full range specifications The specification for PA41A/PA42A is identical to the specification for PA41/PA42 in applicable column to the left. Unless otherwise noted TC = 25C, CC = 18pF, RC = 2.2K. DC input specifications are value given. Power supply voltage is typical rating. Long term operation at the maximum junction temperature will result in reduced product life. Derate internal power dissipation to achieve high MTTF. For guidance, refer to heatsink data sheet. Derate maximum supply voltage .5 V/C below case temperature of 25C. No derating is needed above TC = 25C. Sample tested by wafer to 95%. Guaranteed but not tested. The selected value of RCL must be added to the values given for total output resistance. Specifications separated by / indicate values for the PA41 and PA42 respectively. The PA41/PA42 is constructed from MOSFET transistors. ESD handling procedures must be observed. CAUTION APEX MICROTECHNOLOGY CORPORATION * 5980 NORTH SHANNON ROAD * TUCSON, ARIZONA 85741 * USA * APPLICATIONS HOTLINE: 1 (800) 546-2739 TYPICAL PERFORMANCE GRAPHS PA41/PA42 * PA41A/PA42A CURRENT LIMIT NORMALIZED CURRENT LIMIT, (%) 140 130 120 110 +I LIM 100 90 80 -50 -25 0 25 50 75 100 125 CASE TEMPERATURE, TC (C) 0 -30 -I LIM 60 INTERNAL POWER DISSIPATION, P(W) POWER DERATING 15 12 9 6 T = TA 3 T = TA 0 0 25 50 75 100 TEMPERATURE, T (C) 125 T = TC PA41 T = TC PA42 CURRENT LIMIT CURRENT LIMIT RANGE, I (mA) 40 20 0 -20 -40 -60 +I LIM -I LIM 100 200 0 300 400 500 CURRENT LIMIT RESISTOR, R CL ( ) SMALL SIGNAL RESPONSE 120 PHASE RESPONSE 400 CC = 3.3pF CC = 10pF CC = 18pF POWER RESPONSE OUTPUT VOLTAGE, VO (VPP ) R L = 10K OPEN LOOP GAIN, A(dB) 100 CC = 3.3pF 80 60 40 CC = 18pF 20 0 1 10 100 1K 10K .1M 1M 10M FREQUENCY, F (Hz) CC = 10pF -60 200 CC = 10pF 100 80 60 40 CC = 18pF 20 10K 20K30K 50K .1M .2M .3M .5M FREQUENCY, F (Hz) CC = 3.3pF PHASE, () -90 -120 -150 -180 -210 CC = 10pF 1 10 100 1K 10K .1M 1M 10M FREQUENCY, F (Hz) CC = 18pF CC = 3.3pF -20 1M HARMONIC DISTORTION 1.0 .6 .4 60 AV = 20 CC = 3.3pf R L = 2K VO = 30VPP VO = 180VPP VO = 60VPP 50 SLEW RATE NORMALIZED QUIESCENT CURRENT, (%) QUIESCENT CURRENT 150 130 110 SLEW RATE, V/s DISTORTION, (%) .2 .1 .06 .04 .02 40 30 20 10 0 0 4 8 12 16 20 COMPENSATION CAPACITANCE, C C (pf) T 90 C =8 5C 5C 5C .01 .006 .004 .002 100 200 1K 3K 10K 30K 100K FREQUENCY, F (Hz) TC 70 =2 TC = -2 50 100 150 300 350 200 250 TOTAL SUPPLY VOLTAGE, VS (V) COMMON MODE REJECTION, CMR (dB) 120 100 80 60 40 20 0 1 POWER SUPPLY REJECTION, PSR (dB) COMMON MODE REJECTION POWER SUPPLY REJECTION 120 100 80 60 40 20 0 1 10 100 1K 10K .1M FREQUENCY, F (Hz) 1M -VS +VS VOLTAGE DROP FROM SUPPLY, VS - VO (V) OUTPUT VOLTAGE SWING 18 16 14 12 10 8 6 4 2 0 85C - OU T - OUT 25C - OUT -25C T -25C +OU 85C +OUT 25C +OUT 0 20 40 60 80 100 120 OUTPUT CURRENT, I O (mA) 10 100 1K 10K .1M FREQUENCY, F (Hz) 1M APEX MICROTECHNOLOGY CORPORATION * TELEPHONE (520) 690-8600 * FAX (520) 888-3329 * ORDERS (520) 690-8601 * EMAIL prodlit@apexmicrotech.com PA41/PA42 * PA41A/PA42A GENERAL Please read Application Note 1 "General Operating Considerations" which covers stability, supplies, heat sinking, mounting, current limit, SOA interpretation, and specification 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; Apex's complete Application Notes library; Technical Seminar Workbook; and Evaluation Kits. OPERATING CONSIDERATIONS The PA41/42 is externally compensated and performance can be tailored to the application. Use the graphs of small signal gain and phase response as well as the graphs for slew rate and power response as a guide. The compensation capacitor CC must be rated at 350V working voltage. The compensation capacitor and associated resistor RC must be mounted closely to the amplifier pins to avoid spurious oscillation. An NPO capacitor is recommended for compensation. SAFE OPERATING AREA (SOA) The MOSFET output stage of this power operational amplifier has two distinct limitations: 1. The current handling capability of the die metallization. 2. The 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. CURRENT LIMIT For proper operation the current limit resistor, RCL, must be connected as shown in the external connection diagram. The minimum value is 18 ohms, however for optimum reliability the resistor value should be set as high as possible. The value can be estimated as follows with the maximum practical value of 500 ohms. 3 RCL = ILIM Use the typical performance graphs as a guide for expected variations in current limit value with a given RCL and variations over temperature. The selected value of RCL must be added to the specified typical value of output resistance to calculate the total output resistance. Since the load current passes through RCL the value selected also affects the output voltage swing according to: VR = IO * RCL where VR is the voltage swing reduction. When the amplifier is current limiting, there may be small signal spurious oscillation present during the current limited portion of the negative half cycle. The frequency of the oscillation is not predictable and depends on the compensation, gain of the amplifier, and load. The oscillation will cease as the amplifier comes out of current limit. 200 PA41 SOA OUTPUT CURRENT FROM +VS OR -VS, (mA) 120 100 300mS 50 40 30 20 200mS DC DC ,T C = DC 85 ,T C C = 10 12 5 C INPUT PROTECTION The PA41/42 inputs are protected against common mode voltages up the supply rails and differential voltages up to 16 volts as well as static discharge. Differential voltages exceeding 16 volts will be clipped by the protection circuitry. However, if more than a few milliamps of current is available from the overload source, the protection circuitry could be destroyed. The protection circuitry includes 300 ohm current limiting resistors at each input, but this may be insufficient for severe overloads. It may be necessary to add external resistors to the application circuit where severe overload conditions are expected. Limiting input current to 1mA will prevent damage. 5 4 3 PULSE CURVES @ 10% DUTY CYCLE MAX 2 10 20 30 50 100 200 300 500 SUPPLY TO OUTPUT DIFFERENTIAL, VS -VO (V) 200 PA42 SOA 10 0 0m S OUTPUT CURRENT FROM +VS OR -VS, (mA) 120 100 30 0m S 20 m S 50 40 30 20 STABILITY The PA41/42 has sufficient phase margin when compensated for unity gain to be stable with capacitive loads of at least 10 nF. However, the low pass circuit created by the sumpoint (-in) capacitance and the feedback network may add phase shift and cause instabilities. As a general rule, the sumpoint load resistance (input and feedback resistors in parallel) should be 5K ohm or less at low gain settings (up to 10). Alternatively, use a bypass capacitor across the feedback resistor. The time constant of the feedback resistor and bypass capacitor combination should match the time constant of the sumpoint resistance and sumpoint capacitance. DC DC ,T C DC ,T = 85 C = C 12 10 5 C 5 4 3 PULSE CURVES @ 10% DUTY CYCLE MAX 2 10 20 30 50 100 200 300 500 SUPPLY TO OUTPUT DIFFERENTIAL, VS -VO (V) This data sheet has been carefully checked and is believed to be reliable, however, no responsibility is assumed for possible inaccuracies or omissions. All specifications are subject to change without notice. PA41/42U REV. G JANUARY 1999 (c) 1999 Apex Microtechnology Corp. |
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