HIGH VOLTAGE POWER OPERATIONAL AMPLIFIER PA44 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 • • • • • • • SURFACE MOUNT PACKAGE MONOLITHIC MOS TECHNOLOGY LOW COST HIGH VOLTAGE OPERATION—350V LOW QUIESCENT CURRENT—2mA NO SECOND BREAKDOWN HIGH OUTPUT CURRENT—120 mA PEAK APPLICATIONS • • • • EQUIVALENT SCHEMATIC TELEPHONE RING GENERATOR PIEZO ELECTRIC POSITIONING ELECTROSTATIC TRANSDUCER & DEFLECTION DEFORMABLE MIRROR FOCUSING 13 +VS D1 Q1 Q2 Q3 DESCRIPTION The PA44 is a high voltage monolithic MOSFET operational amplifier 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 PA44 is packaged in Apex's PSOP1 non-hermetic surface mountable dual in line package. The metal back of the package is tied to –Vs. Q4 15 Q5 Q7 5 19 –IN COMP D2 D3 D4 Q6 21 OUT Q9 COMP Q8 D5 17 7 +IN Q11 Q10 Q13 Q12 Q14 –VS 12 TYPICAL APPLICATION SUB 140V 2.67K 100K EXTERNAL CONNECTIONS IN6300A 15V 2.5K + 15 RLIM 100Ω RLIM .22 MUR130 10K 5 6 7 90Vrms ICL8038 PA44 27 8 IN6300A 10 100 1 21 19 17 15 13 OUT COMP COMP ILIM +VS –IN 5 –VS +IN 7 12 11 .22 82K 330pf * * 1.5 µF @ 16Hz 1.2 µF @ 20Hz CS 330pF 2.2K MUR120 2 * CC RC 3.3pF 10K 4 I LIM MUR120 –15V –140V MUR130 Telephone Ring Generator The PA44 is set for a gain of 38.5 boosting the 2.33V signal to 90V. The recommended compensation for gains above 30 is used. If capacitive loading is at least 330pF at all times, the recommended snubber network may be omitted. The 27 ohm resistor sets current limit to a nominal value of 111mA to insure peak currents out of at least 78mA. NC * TOP VIEW * Supply bypassing required. See General Operating Considerations. PHASE COMPENSATION Gain 1 ≥10 ≥30 CC 18pF 10pF 3.3pF RC 2.2KΩ 2.2KΩ 2.2KΩ APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL [email protected] ABSOLUTE MAXIMUM RATINGS SPECIFICATIONS PA44 SUPPLY VOLTAGE, +VS to –VS OUTPUT CURRENT, continuous within SOA OUTPUT CURRENT, peak POWER DISSIPATION, continuous @ TC = 25°C INPUT VOLTAGE, differential INPUT VOLTAGE, common mode TEMPERATURE, pin solder – 10 sec TEMPERATURE, junction2 TEMPERATURE, storage TEMPERATURE RANGE, powered (case) ABSOLUTE MAXIMUM RATINGS SPECIFICATIONS INPUT OFFSET VOLTAGE, initial4 OFFSET VOLTAGE, vs. temperature4 OFFSET VOLTAGE, vs supply OFFSET VOLTAGE, vs time BIAS CURRENT, initial BIAS CURRENT, vs supply OFFSET CURRENT, initial 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 RESISTANCE, AC junction to case RESISTANCE, DC junction to case RESISTANCE, junction to air TEMPERATURE RANGE, case NOTES: 1. 2. 3. 4. 5. 6. CAUTION PA44 TEST CONDITIONS1 PARAMETER 350V 60 mA 120 mA 12W ±16 V ±VS 220°C 150°C –65 to +150°C –40 to +125°C MIN TYP MAX UNITS 15 70 20 75 50 2 50 1011 5 30 130 32 94 50 110 mV µV/°C µV/V µV √kh pA pA/V pA Ω pF V dB µV RMS µV p-p 94 106 1.6 26 60 dB MHz kHz ° ±VS–12 ±VS–10 Full temperature range VCM = ±90V DC 10kHz BW, RS = 1KΩ 1-10 Hz RL = 5KΩ ±VS–12 84 CC = 10pf, 280V p-p Full temperature range IO = 40mA 200 20 200 120 60 CC = 10pF, 10V step, AV = –10 CC = OPEN AV = +1 RCL = 0 RCL = 0 See Note 3 F > 60Hz F < 60Hz Full temperature range Meets full range specifications 12 40 10 150 25 ±50 –25 V mA mA µs V/µs nF Ω Ω ±150 1.6 ±175 2.0 V mA 6 9 25 7 11 °C/W °C/W °C/W °C +85 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. 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. The PA44 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 PA44 POWER DERATING CURRENT LIMIT T = TA 3 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 4 8 12 16 20 0 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) 0 –20 -I LIM –40 –60 0 300 400 500 100 200 CURRENT LIMIT RESISTOR, R CL (Ω 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 20 POWER RESPONSE CC = 18pF –120 –150 +I LIM 400 –90 20 40 PHASE RESPONSE 120 80 CURRENT LIMIT RANGE, I (mA) 6 130 OUTPUT VOLTAGE, VO (VPP ) 9 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 TC 5°C =8 90 5°C TC =2 70 TC 5°C = -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 PA44 GENERAL CURRENT LIMIT For proper operation the current limit resistor, RCL, must be connected as shown in the external connection diagram. The minimum value is 33 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 PA44 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 PA44 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 1K 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. The PA44 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. PA44 SOA 200 120 100 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. 200mS 300mS 50 40 DC ,T 30 C 20 DC ,T C 10 = 12 DC = 85 °C 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) HEATSINKING The PA44 package has a large exposed integrated copper heatslug to which the monolithic amplifier is directly attached. The solder connection of the heatslug to a minimum 1 square inch foil area of the printed circuit board will result in thermal performance of 25°C/W junction to air rating of the PA44. Solder connection to an area of 1 to 2 square inches of foil is recommended. This may be adequate heatsinking but the large number of variables involved suggest temperature measurements be made on the top of the package. Do not allow the temperature to exceed 85°C. The heatslug is tied internally to –Vs. 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. PA44U REV. C APRIL 2000 © 2000 Apex Microtechnology Corp.