HIGH VOLTAGE POWER OPERATIONAL AMPLIFIERS PA41/PA42 • PA41A/PA42A HTTP://WWW.APEXMICROTECH.COM M I C R O T E C H N O L O G Y (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 APPLICATIONS • • • • • 20R R PIEZO ELECTRIC POSITIONING ELECTROSTATIC TRANSDUCER & DEFLECTION DEFORMABLE MIRROR FOCUSING BIOCHEMISTRY STIMULATORS COMPUTER TO VACUUM TUBE INTERFACE 20R V IN +175 +175 10pF 10pF A1 PA41/42 A2 PA41/42 R CL R CL Rn PIEZO 180 TRANSDUCER 180 100 Ω 100 Ω 330pF 330pF 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. 8 (6) +VS D1 EXTERNAL CONNECTIONS R CL OUT PHASE COMPENSATION CC RC Gain 1 ≥10 ≥30 2 COMP 1 I LIM 4 Q3 Q4 Q5 (8) 2 Q6 COMP (1) 5 –IN D4 D5 (2) 6 +IN COMP Q8 (9) 3 Q11 Q12 Q13 I LIM 1 (7) PA41 4 (10) OUT PA42 5 PA41 PIN NUMBER –VS +IN 7 RC 2.2KΩ 2.2KΩ 2.2KΩ RS 100 Ω +VS C S , C C ARE NPO RATED FOR FULL SUPPLY VOLTAGE. R CL = 3 I LIM Q7 Q9 TOP VIEW 1 2 3 NC Q10 –IN Q14 (1) PA42 PIN NUMBER 8 6 CC 18pF 10pF 3.3pF CS 330pF TOP VIEW –IN Q2 –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. 5 Q1 Cn LOW COST 660V p-p PIEZO DRIVE –175 COMP 3 EQUIVALENT SCHEMATIC D3 2.2K 2.2K DESCRIPTION D2 20R –VS 7 (5) +IN 4 5 NC –VS 6 +VS I LIM RS 100Ω CS 330pf 7 8 9 CC RC CC 10 OUT CC RCL 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. APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL [email protected] ABSOLUTE MAXIMUM RATINGS SPECIFICATIONS PA41/PA42 • PA41A/PA42A 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 = 25°C 12W 9W INPUT VOLTAGE, differential ±16 V ±16 V INPUT VOLTAGE, common mode ±VS ±VS TEMPERATURE, pin solder – 10 sec 300°C 220°C TEMPERATURE, junction2 150°C 150°C TEMPERATURE, storage –65 to +150°C –65 to +150°C TEMPERATURE RANGE, powered (case) –40 to +125°C –40 to +125°C ABSOLUTE MAXIMUM RATINGS SPECIFICATIONS 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. CAUTION PA41/PA42 TEST CONDITIONS1 PARAMETER MIN Full temperature range VCM = ±90V DC 10kHz BW, RS = 1KΩ 1-10 Hz RL = 5KΩ ±VS–12 84 94 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 F > 60Hz F > 60Hz F < 60Hz F < 60Hz Full temperature range Full temperature range Meets full range specifications TYP PA41A/PA42A MAX 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 * ±VS–12 ±VS–10 120 60 12 40 10 150 25 ±50 –25 MIN TYP MAX UNITS 15 40/* * * * * * * * 30 65/* * * * * mV µV/°C µV/V µV √kh pA pA/V pA Ω pF V dB µV RMS µV p-p * * * * dB MHz kHz ° * * * ±VS–10 ±VS–8.5 * * * * * * * ±150 1.6 ±175 2.0 5.4 7 9 12 30 55 6.5 10 10.4 14 +85 * .9 V mA mA µs V/µs nF Ω Ω * 1.4 * 1.8 V mA * * * * * * * * * * °C/W °C/W °C/W °C/W °C/W °C/W °C * * The specification for PA41A/PA42A is identical to the specification for PA41/PA42 in applicable column to the left. Unless otherwise noted TC = 25°C, CC = 18pF, RC = 2.2KΩ. 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 25°C. No derating is needed above TC = 25°C. 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. APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739 PA41/PA42 • PA41A/PA42A POWER DERATING CURRENT LIMIT 9 PA42 6 T = TA 3 T = TA 0 0 25 50 75 100 TEMPERATURE, T (°C) 125 120 –I LIM 110 +I LIM 100 90 80 –50 –25 0 25 50 75 100 125 CASE TEMPERATURE, TC (°C) SMALL SIGNAL RESPONSE 100 –30 CC = 3.3pF –60 CC = 10pF PHASE, ϕ (°) OPEN LOOP GAIN, A(dB) 0 CC = 3.3pF CC = 10pF 60 40 CC = 18pF 0 –180 –20 1 10 100 1K 10K .1M 1M 10M FREQUENCY, F (Hz) –210 CC = 10pF 1 .1 .06 .04 SLEW RATE AV = 20 CC = 3.3pf R L = 2K Ω 50 VO = 30VPP VO = 180VPP VO = 60VPP .02 .01 .006 .004 30 20 0 COMMON MODE REJECTION 120 100 80 60 40 20 0 1 10 100 1K 10K .1M FREQUENCY, F (Hz) 1M 0 4 8 12 16 20 COMPENSATION CAPACITANCE, C C (pf) POWER SUPPLY REJECTION, PSR (dB) COMMON MODE REJECTION, CMR (dB) 40 10 .002 100 200 1K 3K 10K 30K 100K FREQUENCY, F (Hz) –20 -I LIM –40 –60 100 200 0 300 400 500 CURRENT LIMIT RESISTOR, R CL ( Ω ) POWER SUPPLY REJECTION 120 100 +VS 80 60 –VS 40 20 0 1 10 100 1K 10K .1M FREQUENCY, F (Hz) 1M R L = 10K Ω 200 CC = 10pF 100 80 CC = 3.3pF 60 40 CC = 18pF 20 10K 20K30K 50K .1M .2M .3M .5M FREQUENCY, F (Hz) 10 100 1K 10K .1M 1M 10M FREQUENCY, F (Hz) 60 SLEW RATE, V/µs DISTORTION, (%) .2 CC = 18pF CC = 3.3pF HARMONIC DISTORTION 1.0 .6 .4 0 POWER RESPONSE CC = 18pF –120 –150 +I LIM 20 400 –90 20 40 PHASE RESPONSE 120 80 CURRENT LIMIT RANGE, I (mA) T = TC 130 OUTPUT VOLTAGE, VO (VPP ) PA41 60 NORMALIZED QUIESCENT CURRENT, (%) T = TC 12 CURRENT LIMIT 140 1M QUIESCENT CURRENT 150 130 110 VOLTAGE DROP FROM SUPPLY, VS – VO (V) 15 NORMALIZED CURRENT LIMIT, (%) INTERNAL POWER DISSIPATION, P(W) TYPICAL PERFORMANCE GRAPHS 5°C T C =8 90 5°C TC =2 5°C 70 TC = -2 50 100 150 300 350 200 250 TOTAL SUPPLY VOLTAGE, VS (V) OUTPUT VOLTAGE SWING 18 16 14 85°C 12 T – OU – OUT 25°C – OUT –25°C 10 8 6 T –25°C +OU 85°C +OUT 4 2 0 25°C +OUT 0 20 40 60 80 100 120 OUTPUT CURRENT, I O (mA) APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL [email protected] OPERATING CONSIDERATIONS PA41/PA42 • PA41A/PA42A 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. 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. 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. 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. 200 PA41 SOA 120 OUTPUT CURRENT FROM +VS OR –VS, (mA) 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. 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. 200mS 100 300mS 50 40 DC DC ,T 30 C 20 = 85 DC ,T C = °C 12 5° 10 C 5 4 3 PULSE CURVES @ 10% DUTY CYCLE MAX 2 10 200 20 30 50 100 200 300 500 SUPPLY TO OUTPUT DIFFERENTIAL, VS -VO (V) PA42 SOA 120 OUTPUT CURRENT FROM +VS OR –VS, (mA) GENERAL 30 100 20 C ,T C 10 DC ,T DC = S S DC 30 m 0m S 50 40 10 0 20 0m = 85 °C 12 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 © 1999 Apex Microtechnology Corp.