POWER OPERATIONAL AMPLIFIERS PA33 • PA33A 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 • • • • • • • • HIGH INTERNAL DISSIPATION — 250 WATTS HIGH VOLTAGE, HIGH CURRENT — 100V, 30A HIGH SLEW RATE — 100V/µS 4 WIRE CURRENT LIMIT SENSING LOW DISTORTION EXTERNAL SHUTDOWN CONTROL OPTIONAL BOOST VOLTAGE INPUTS EVALUATION KIT — SEE EK04 APPLICATIONS • LINEAR AND ROTARY MOTOR DRIVES • SONAR TRANSDUCER DRIVER • YOKE/MAGNETIC FIELD EXCITATION • PROGRAMMABLE POWER SUPPLIES TO ±45V • AUDIO UP TO 500W The DIP04 12-pin package (see Package Outlines) is hermetically sealed and isolated from the internal circuits. The use of compressible thermal washers and/or improper mounting torque will void the product warranty. Please see “General Operating Considerations”. DESCRIPTION The PA33 is a high voltage MOSFET power operational amplifier that extends the performance limits of power amplifiers in slew rate and power bandwidth, while maintaining high current and power dissipation ratings. The PA33 is a highly flexible amplifier. The shutdown control feature allows the output stage to be turned off for standby operation or load protection during fault conditions. Boost voltage inputs allow the small signal portion of the amplifier to operate at a higher voltage than the high current output stage. The amplifier is then biased to achieve close linear swings to the supply rails at high currents for extra efficient operation. External compensation tailors slew rate and bandwidth performance to user needs. A four wire sense technique allows precision current limiting without the need to consider internal or external milliohm parasitic resistance in the output line. The output stage is protected by thermal limiting circuits above junction temperatures of 175°C. TYPICAL APPLICATION The high power bandwidth of the PA33 allows driving sonar transducers via a resonant circuit including the transducer and a matching transformer. The load circuit appears resistive to the PA33. Control logic turns off the amplifier's output during shutdown. Rf CONTROL LOGIC ULTRASONIC DRIVE Ri 1 2 12 PA33 7 R CL 11 10 EQUIVALENT SCHEMATIC TUNED TRANSFORMER SHUTDOWN 12 9 +VBOOST –INPUT D1 Q8 Q1 Q12 Q13 Q4 4 COMP 3 Q17 Q14 Q18 ILIM 11 10 ILIM Q24 Q25 D20 BIAS +INPUT COMP R CC C COMP –V BOOST * –SUPPLY Q21 Q29 D27 D31 Q30 –VBOOST 5 OUT 7 D5 Q22 –IN 1 D19 +IN 2 Q5 D6 D9 Q10 Q16 EXTERNAL CONNECTIONS +Vs 8 Q33 D4 6 –Vs Gain 1 >3 ≥10 SHUTDOWN 1 12 2 11 3 TOP VIEW 10 CURRENT LIMIT CURRENT LIMIT 9 +V BOOST 5 8 6 7 *+SUPPLY 4 OUTPUT PHASE COMPENSATION CC 470pF 220pF 82pF RC 120Ω 120Ω 120Ω CC RATED FOR FULL SUPPLY VOLTAGE *See BOOST OPERATION paragraph. APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL [email protected] ABSOLUTE MAXIMUM RATINGS SPECIFICATIONS PA33 • PA33A ABSOLUTE MAXIMUM RATINGS SUPPLY VOLTAGE, +VS to –VS BOOST VOLTAGE OUTPUT CURRENT, continuous within SOA POWER DISSIPATION, internal INPUT VOLTAGE, differential INPUT VOLTAGE, common mode TEMPERATURE, pin solder - 10s TEMPERATURE, junction2 TEMPERATURE, storage OPERATING TEMPERATURE RANGE, case SPECIFICATIONS INPUT OFFSET VOLTAGE, initial OFFSET VOLTAGE, vs. temperature OFFSET VOLTAGE, vs. supply OFFSET VOLTAGE, vs. power BIAS CURRENT, initial BIAS CURRENT, vs. supply OFFSET CURRENT, initial INPUT IMPEDANCE, DC INPUT CAPACITANCE COMMON MODE VOLTAGE RANGE COMMON MODE REJECTION, DC INPUT NOISE GAIN OPEN LOOP, @ 15Hz GAIN BANDWIDTH PRODUCT POWER BANDWIDTH PHASE MARGIN OUTPUT VOLTAGE SWING VOLTAGE SWING CURRENT, peak SETTLING TIME to .1% SLEW RATE CAPACITIVE LOAD RESISTANCE POWER SUPPLY VOLTAGE CURRENT, quiescent, boost supply CURRENT, quiescent, total CURRENT, quiescent, total, shutdown THERMAL RESISTANCE, AC, junction to case3 RESISTANCE, DC, junction to case RESISTANCE, junction to air4 TEMPERATURE RANGE, case NOTES: * 1. 2. 3. 4. CAUTION PA33 TEST CONDITIONS 1 PARAMETER 100V SUPPLY VOLTAGE +20V 30A 250W ±20V ±VB 300°C 175°C –65 to +150°C –55 to +125°C MIN Full temperature range Full temperature range Full temperature range Full temp. range, VCM = ±20V 100KHz BW, RS = 1KΩ Full temperature range, CC = 82pF RL = 10Ω RL = 4Ω, VO = 80VP-P, AV = –10 CC = 82pF, RC = 120Ω Full temperature range, CC = 470pF IO = 20A VBOOST = Vs + 5V, IO = 30A AV = +1, 10V step, RL = 4Ω AV = –10, CC = 82pF, RC = 120Ω Full temperature range, AV = +1 IO = 0, No load, 2MHz IO = 1A, 2MHz Full temperature range Full temperature range, F>60Hz Full temperature range, F<60Hz Full temperature range Meets full range specification ±VB–8 90 94 PA33A TYP MAX 5 20 10 30 10 .01 10 1011 13 10 50 30 MIN 50 50 * * 100 10 102 3 400 * 60 ±VS–9.5 ±VS–8.7 ±VS–5.8 ±VS–5.0 30 2.5 80 100 2.2 5 2 ±15 –25 * * * TYP MAX UNITS 2 10 * 10 5 * 5 * * 5 30 * * * mV µV/°C µV/V µV/W pA pA/V pA Ω pF V dB µVrms * * * dB MHz kHz * ° * * V V A µs V/µs nF Ω Ω 20 20 * * * * * ±45 46 90 46 ±50 56 120 56 .3 .4 12 .4 .5 85 * * * * * * * * * * V mA mA mA * * * * * °C/W °C/W °C/W °C * The specification of PA33A is identical to the specification for PA33 in applicable column to the left. Unless otherwise noted: TC = 25°C, CC = 470pF, RC = 120 ohms. DC input specifications are ± value given. Power supply voltage is typical rating. ±VBOOST = ±VS. 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 the heatsink data sheet. Rating applies if the output current alternates between both output transistors at a rate faster than 60 Hz. The PA33 must be used with a heatsink or the quiescent power may drive the unit to junction temperatures higher than 150°C. The PA33 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 50 0 0 40 20 0 10 PHASE RESPONSE CC = 82pf CC = 220pf 40 –90 CC = 470pf 0 10 CC = 82pf $ R L = 8Ω$ $ $ Ω$ R C = 120 –225 $ 10 100 1K 10K 100K 1M FREQUENCY, f (Hz) 100 1K 10K 100K 1M FREQUENCY, f (Hz) 10M COMMON MODE REJECTION 10M OUTPUT VOLTAGE, VO (V) 80 60 40 A V = +1 C C = 470pF 5 2.5 0 0 5 10 15 20 25 OUTPUT CURRENT, I O (A) 30 30 130 120 110 100 90 80 70 60 –50 –25 0 25 50 75 100 125 CASE TEMPERATURE, T C (°C) QUIESCENT CURRENT POWER RESPONSE 100 1.2 1.1 .9 .8 40 60 80 20 100 TOTAL SUPPLY VOLTAGE, VS (V) 40 20 10 F 0p 1.0 60 pF 82 NORMALIZED QUIESCENT CURRENT, I Q (X) W 00 25 + 5V 2 22 100 300 1K 3K 10K 30K FREQUENCY, f (Hz) 10 15 20 TIME, t (µs) = VS = .001 30 PO V BOOST = .002 = 0W 20 4 F 0p 47 PO = 1W .005 6 = .01 5 S CC .02 0 =V CC A V = 10$ R L = 2 Ω$ C C = 82pF, $ R C = 120 Ω$ $ ±Vs = 31V ST V BOO CC .05 HARMONIC DISTORTION =3 .1 1M O .2 –5 –7.5 100 1K 10K 100K FREQUENCY, f (Hz) P 0 10 8 CURRENT LIMIT –2.5 20 OUTPUT VOLTAGE SWING PULSE RESPONSE 7.5 100 DISTORTION, THD (%) CC = 220pf –180 20 40 10 CC = 220pf CC = 470pf –135 CC = 470pf 60 12 –45 60 80 20 300 400 500 100 200 EXT. COMPENSATION CAPACITOR C C (pF) 100 1K 10K 100K 1M 10M FREQUENCY f (Hz) 0 $ R L = 8Ω$ $ $ Ω$ R C = 120 $ CC = 82pf 80 COMMON MODE REJECTION, CMR (dB) 60 SMALL SIGNAL RESPONSE 100 OPEN LOOP GAIN, A(dB) 25 50 75 100 125 150 CASE TEMPERATURE, T(°C) SLEW RATE, SR (V/µs) 100 80 VOLTAGE DROP FROM SUPPLY, VS–VO (V) 150 SLEW RATE VS. COMP. 100 NORMALIZED CURRENT LIMIT, (%) 200 POWER SUPPLY REJECTION 100 OUTPUT VOLTAGE, VO (VPP) POWER DERATING 250 POWER SUPPLY REJECTION, PSR (dB) PA33 • PA33A PHASE, Φ (°) INTERNAL POWER DISSIPATION, P(W) TYPICAL PERFORMANCE GRAPHS 6 4 2 40K 1M .4M 100K FREQUENCY, f (Hz) 4M APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL [email protected] OPERATING CONSIDERATIONS PA33 • PA33A GENERAL SHUTDOWN OPERATION 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. To disable the output stage, pin 12 is connected to ground via relay contacts or via an electronic switch. The switching device must be capable of sinking 2mA to complete shutdown and capable of standing off the supply voltage +VS. See Figure 2 for suggested circuits. –LOGIC K1 12 SHUTDOWN CURRENT LIMIT The two current limit sense lines are to be connected directly across the current limit sense resistor. For the current limit to work correctly, pin 11 must be connected to the amplifier output side and pin 10 connected to the load side of the current limit resistor, RCL, as shown in Figure 1. This connection will bypass any parasitic resistances, RP formed by sockets and solder joints as well as internal amplifier losses. The current limiting resistor may not be placed anywhere in the output circuit except where shown in Figure 1. If current limiting is not used, pins 10 and 11 must be tied to pin 7. The value of the current limit resistor can be calculated as follows: R f Ri 2 PA33 RP 7 CL RCL RL ILIMIT = .7/RCL FIGURE 1. CURRENT LIMIT SAFE OPERATING AREA (SOA) The MOSFET output stage of this power operational amplifier has two distinct limitations: 1. The current handling capability of the MOSFET geometry and the wire bonds. 2. The junction 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. t= D 20 C 15 12 9 0m Tc s = C D 25 Tc °C Tc 85 C °C = D Q1 470Ω B From an internal circuitry standpoint, shutdown is just a special case of current limit where the allowed output current is zero. As with current limit, however, a small current does flow in the output during shutdown. A load impedance of 100 ohms or less is required to insure the output transistors are turned off. Note that even though the output transistors are off the output pin is not open circuited because of the shutdown operating current. BOOST OPERATION With the VBOOST feature, the small signal stages of the amplifier are operated at higher supply voltages than the amplifier’s high current output stage. +VBOOST (pin 9), and –VBOOST (pin 5) are connected to the small signal circuitry of the amplifier. +VS (pin 8) and –VS (pin 6) are connected to the high current output stage. An additional 5V on the VBOOST pins is sufficient to allow the small signal stages to drive the output transistors into saturation and improve the output voltage swing for extra efficient operation when required. When close swings to the supply rails is not required the +VBOOST and +VS pins must be strapped together as well as the –VBOOST and –VS pins. The boost voltage pins must not be at a voltage lower than the VS pins. = C 5° 12 OUTPUT CURRENT (A) 30 6 –LOGIC 11 CL INPUT 12 SHUTDOWN FIGURE 2. SHUTDOWN OPERATION 10 1 A 3 1.5 1.2 .9 .6 .3 1 2 3 4 5 10 20 30 40 50 100 SUPPLY TO OUTPUT DIFFERENTIAL (V) COMPENSATION The external compensation components CC and RC are connected to pins 3 and 4. Unity gain stability can be achieved at any compensation capacitance greater than 470 pF with at least 60 degrees of phase margin. At higher gains, more phase shift can be tolerated in most designs and the compensation capacitance can accordingly be reduced, resulting in higher bandwidth and slew rate. Use the typical operating curves as a guide to select CC and RC for the application. 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. PA33U REV. A JULY 2001 © 2001 Apex Microtechnology Corp.