HIGH VOLTAGE POWER OPERATIONAL AMPLIFIER PA45 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—150V HIGH SLEW RATE—27V/µs HIGH POWER—5A, 85W DISSIPATION PATENTED APPLICATIONS • • • • TYPICAL APPLICATION MAGNETIC DEFLECTION PA AUDIO MOTOR DRIVE NOISE CANCELLATION +80 RC 3 DESCRIPTION 4 VI The PA45 is a high power monolithic MOSFET operational amplifier that achieves performance levels unavailable even in many hybrid amplifier designs. Inputs are protected from excessive common mode and differential mode voltages as well as static discharge. 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. This circuit utilizes a beryllia (BeO) substrate to minimize thermal resistance. Ultrasonically bonded aluminum wires provide reliable interconnections at all operating temperatures. The 8-pin TO-3 package is hermetically sealed and electrically isolated. The use of compressible isolation washers and/or improper mounting torque will void the product warranty. EQUIVALENT SCHEMATIC CC 2 7 PA45 RI 5 1 CF 6 YOKE RD –20 RF RS ±2.5A 7µSec Retrace Horizontal Deflection Coil Amplifiers Horizontal deflection amplifiers require both high speed and low distortion. The speed at which current can be changed in a deflection coil is a function of the voltage available from the op amp. In this application an 80 volt power supply is used for the retrace polarity to provide a 7 µSec retrace time, half of which is required for amplifier slewing. This circuit can perform 15.75 KHz deflection in up to 50µH coils at up to 5A p-p. EXTERNAL CONNECTIONS 3 +VS D1 Q2 +VS CC1 Q24 Q5 3 Q6 Q7 Q3 Q8 D2 D5 –IN 5 Q11 Q12 CC1 2 7 CC2 4 +IN Q20 Q9 Q10 OUTPUT DRIVE 8 CC OUTPUT CURRENT SENSE 2 1 +IN 4 R CL TOP VIEW D3 D4 –VS 6 RCL 8 Q21 Q13 Q14 1 CURRENT SENSE Q15 Q16 5 8 –IN –VS 6 OUTPUT DRIVE 7 CC2 Q17 Q19 D7 RC C C IS NPO RATED FOR FULL SUPPLY VOLTAGE. PHASE COMPENSATION Gain CC RC ≥10 ≥1 10pF 68pF 1KΩ 1KΩ APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL [email protected] ABSOLUTE MAXIMUM RATINGS SPECIFICATIONS PA45 SUPPLY VOLTAGE, +VS to –VS OUTPUT CURRENT, continuous within SOA POWER DISSIPATION, continuous @ TC = 25°C INPUT VOLTAGE, differential INPUT VOLTAGE, common mode TEMPERATURE, pin solder – 10 sec TEMPERATURE, junction TEMPERATURE, storage TEMPERATURE RANGE, powered (case) ABSOLUTE MAXIMUM RATINGS 150V 5A 85W ±16 V ±VS 300°C 150°C –65 to +150°C –55 to +125°C SPECIFICATIONS TEST CONDITIONS1 PARAMETER INPUT OFFSET VOLTAGE, initial OFFSET VOLTAGE, vs. temperature 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 10kHz BW, RS = 1KΩ GAIN OPEN LOOP at 15Hz GAIN BANDWIDTH PRODUCT @ 1MHz POWER BANDWIDTH PHASE MARGIN RL = 500Ω, CC = 10pF CC = 10pF, 130V p-p, RL = 8Ω Full temp range, CC = 68pF, RL = 10Ω OUTPUT VOLTAGE SWING CURRENT, continuous SETTLING TIME to .1% SLEW RATE CAPACITIVE LOAD RESISTANCE , no load POWER SUPPLY VOLTAGE3 CURRENT, quiescent THERMAL2 RESISTANCE, AC junction to case RESISTANCE, DC junction to case RESISTANCE, junction to air TEMPERATURE RANGE, case NOTES: 1. 2. 3. CAUTION MIN TYP MAX UNITS 5 10 8 10 50 15 2 100 2 200 106 10 mV µV/°C µV/V µV √kh pA pA/V pA Ω pF V dB µV RMS 94 106 4.5 66 60 dB MHz kHz ° ±VS–10 5 ±VS–8 V A µs V/µs nF Ω Full temperature range 20 ±VS–10 90 IO = 5A 10V step, AV = –10 CC = 10pF, RL = 8Ω AV = +1, CC = 68pF RCL = 0 See Note 3 F > 60Hz F < 60Hz Full temperature range Meets full range specifications 1011 5 2 27 10 150 ±15 ±50 30 ±75 50 V mA 1.3 1.5 °C/W °C/W °C/W °C 30 –25 +85 Unless otherwise noted TC = 25°C, CC = 10pF, RC = 1KΩ. 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. The PA45 is constructed from MOSFET transistors. ESD handling procedures must be observed. The internal substrate contains beryllia (BeO). Do not break the seal. If accidentally broken, do not crush, machine, or subject to temperatures in excess of 850°C to avoid generating toxic fumes. APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739 PA45 0.7 –50 –25 0 25 50 75 100 125 CASE TEMPERATURE, TC (°C) SMALL SIGNAL RESPONSE POWER RESPONSE 200 PHASE, φ (°) OPEN LOOP GAIN, A(dB) CC = 10pF –45 CC = 10pF CC = 68pF 40 .1 1 –90 CC = 68pF –135 RL = 1KΩ RL = 500Ω 0 RL = 500Ω 10 100 1K 10K 100K 1M 10M FREQUENCY, f (Hz) –180 .1 HARMONIC DISTORTION .100 .040 .020 85W .010 .004 1W .002 5W .001 10 20 40 100 400 1K 2K 4K 10K 20K FREQUENCY, f (Hz) COMMON MODE REJECTION 100 80 60 40 20 10 100 1K 10K 100K FREQUENCY, f (Hz) 1M 100 80 60 CC = 10pF 40 CC = 68pF 20 R L = 8Ω 10 8 6 4 10K 20K 40K 100K 200K 400K FREQUENCY, f (Hz) 10 100 1K 10K 100K 1M 10M FREQUENCY, f (Hz) SLEW RATE SLEW RATE, SR(V/µs) .200 COMMON MODE REJECTION, CMR (dB) DISTORTION, THD (%) .400 1 1M QUIESCENT CURRENT 2.0 50 AV = 10 CC = 10pf RL = 8 Ω 40 1.5 No Load 30 °C 25 = TC 1.0 20 8Ω Load 10 0 20 40 60 80 COMPENSATION CAPACITANCE, C C (pF) POWER SUPPLY REJECTION, PSR (dB) 1.000 1.0 0.1 10 CURRENT LIMIT RESISTOR, R CL (Ω) Ω PHASE RESPONSE 0 120 80 -I LIM –4 5° C 25 50 75 100 125 CASE TEMPERATURE, TC (°C) 0.8 0 –5 0 0.9 = 0 1.0 +I LIM C 20 4 T 40 1.1 CURRENT LIMIT, I (A) 60 ABSOLUTE CURRENT LIMIT OUTPUT VOLTAGE, VO (VPP ) 80 CURRENT LIMIT DRIFT 1.2 VOLTAGE DROP FROM SUPPLY, VS – VO (V) NORMALIZED QUIESCENT CURRENT, IQ(X) POWER DERATING 100 NORMALIZED CURRENT LIMIT, ILIM (X) INTERNAL POWER DISSIPATION, P(W) TYPICAL PERFORMANCE GRAPHS POWER SUPPLY REJECTION 120 100 +VS 80 60 40 –VS 20 0 10 100 1K 10K 100K FREQUENCY, f (Hz) 1M TC = 5°C +12 0.5 10 30 50 70 90 110 130 150 TOTAL SUPPLY VOLTAGE, VS (V) OUTPUT VOLTAGE SWING 10 85°C –OUT 8 85°C +OUT 6 25°C +OUT 25°C – OUT 4 2 0 2 4 OUTPUT CURRENT, I O (A) APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL [email protected] OPERATING CONSIDERATIONS PA45 GENERAL SAFE OPERATING AREA (SOA) Please read the General Operating Considerations section, which covers stability, supplies, heat-sinking, mounting, current limit, SOA interpretation, and specification interpretation. Additional information can be found in the application notes. For information on the package outline, heatsink, and mounting hardware, consult the “Accessories Information” and “Packaging” mechanical data section of the data book. The MOSFET output stage of this power operational amplifier has limitations from its channel temperature. NOTE: The output is protected against transient flyback. However, for protection against sustained, high energy flyback, external fast-recovery diodes should be used. Current limiting is achieved by developing 0.83V on the amplifiers current sense circuit by way of an internal tie to the output drive (pin 8) and an external current sense line (pin 1). A sense resistor RCL is used to relate this sense voltage to a current flowing from output drive. 0.83 – 0.05 * ICL RCL = ICL ICL = 0.83 RCL + 0.05 with a maximum practical value of 16Ω. RCL is added to the typical value of output resistance and affects the total possible swing since it carries the load current. The swing reduction, VR can be established VR = IOUT * RCL. OUTPUT CURRENT FROM +VS OR –VS, (A) CURRENT LIMIT SAFE OPERATING AREA 6.0 4.0 ,T C DC ,T 1.0 0.8 C DC S = S 85 °C 12 5° 0.6 C 0.4 0.2 PULSE CURVES @ 10% DUTY CYCLE MAX 4 The PA45 inputs are protected against common mode voltages up to the supply rails, differential voltages up to ±16 volts and 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 input drive source, the protection circuitry could be destroyed. The protection circuitry includes 300 ohm current limiting resistors at each input. This security may be insufficient for severe overdrive of the input. Adding external resistors to the application which limits severe input overdrive current to 1mA, will prevent damage. = m 0m DC 2.0 0.1 INPUT PROTECTION 10 0 20 6 8 10 20 40 60 100 200 SUPPLY TO OUTPUT DIFFERENTIAL, VS -VO (V) STABILITY The PA45 has sufficient phase margin when compensated for unity gain to be stable with capacitive loads of at least 10nF. However, the low pass circuit created by the sum-point (–in) capacitance and the feedback network may add phase shift and cause instabilities. As a rule, the sum-point load resistance (input and feedback resistors in parallel) should be 1k ohm or less. 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 sum-point resistance and sum-point capacitance. The PA45 is externally compensated and performance can be tailored to the application. The compensation network CCRC must be mounted closely to the amplifier pins 7 and 2 to avoid noise coupling to these high impedance nodes. This data sheet has been carefully checked and is believed be reliable, however, no responsibility assumed forARIZONA possible inaccuracies All specifications are subject to change without notice. APEX MICROTECHNOLOGY CORPORATION • to 5980 NORTH SHANNON ROAD •is TUCSON, 85741 or • omissions. USA • APPLICATIONS HOTLINE: 1 (800) 546-2739 PA45U REV. B FEBRUARY 1998 © 1998 Apex Microtechnology Corp.