® OPA2544 FPO High-Voltage, High-Current DUAL OPERATIONAL AMPLIFIER FEATURES DESCRIPTION ● HIGH OUTPUT CURRENT: 2A min ● WIDE POWER SUPPLY RANGE: ±10V to ±35V The OPA2544 is a dual high-voltage/high-current operational amplifier suitable for driving a wide variety of high power loads. It provides 2A output current and power supply voltage range extends to ±35V. ● SLEW RATE: 8V/µs ● INTERNAL CURRENT LIMIT The OPA2544 integrates two high performance FET op amps with high power output stages on a single monolithic chip. Internal current limit and thermal shutdown protect the amplifier and load from damage. ● THERMAL SHUTDOWN PROTECTION ● FET INPUT: IB = 50pA max ● 11-LEAD PLASTIC PACKAGE The OPA2544 is available in a 11-lead plastic packages and is specified for the –40°C to +85°C temperature range. APPLICATIONS ● MOTOR DRIVER ● PROGRAMMABLE POWER SUPPLY ● SERVO AMPLIFIER ● VALVES, ACTUATOR DRIVER ● MAGNETIC DEFLECTION COIL DRIVER ● AUDIO AMPLIFIER Case connected to V– Supply. A B 1 11 NC V+ V– International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111 • Twx: 910-952-1111 Internet: http://www.burr-brown.com/ • FAXLine: (800) 548-6133 (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132 ® © 1994 Burr-Brown Corporation PDS-1249C 1 OPA2544 Printed in U.S.A. March, 1998 SPECIFICATIONS At TCASE = +25°C and VS = ±35V, unless otherwise noted. OPA2544T PARAMETER CONDITIONS OFFSET VOLTAGE Input Offset Voltage vs Temperature vs Power Supply INPUT BIAS CURRENT(1) Input Bias Current vs Temperature Input Offset Current MIN Specified Temp. Range VS = ±10V to ±35V VCM = 0V Linear Operation Linear Operation VCM = ±VS – 6V (V+) –6 (V–) +6 90 INPUT IMPEDANCE Differential Common-Mode OPEN-LOOP GAIN Open-Loop Voltage Gain FREQUENCY RESPONSE Gain-Bandwidth Product Slew Rate Full-Power Bandwidth Settling Time 0.1% Total Harmonic Distortion OUTPUT Voltage Output: Positive Negative Positive Negative Current Output Short-Circuit Current POWER SUPPLY Specified Operating Voltage Operating Voltage Range Quiescent Current (total) TEMPERATURE RANGE Operating Range Storage Thermal Resistance, θJC2 Thermal Resistance, θJC2 Thermal Resistance, θJC2 Thermal Resistance, θJC2 Thermal Resistance, θJA2 MAX UNITS ±1 ±10 ±10 ±5 ±100 mV µV/°C µV/V ±50 pA ±50 pA ±15 Doubles every 10˚C ±10 VCM = 0V NOISE Input Voltage Noise Noise Density, f = 1kHz Current Noise Density, f = 1kHz INPUT VOLTAGE RANGE Common-Mode Input Range Positive Negative Common-Mode Rejection TYP VO = ±30V, RL = 15Ω 90 RL = 15Ω 60Vp-p, RL = 15Ω 5 G = –10, 60V Step IO = 2A IO = 2A IO = 0.5A IO = 0.5A (V+) –5 (V–) +5 (V+) –4.2 (V–) +4 ±10 IO = 0 36 3 nV/√Hz fA/√Hz (V+) –4 (V–) +4 106 V V dB 1012 || 8 1012 || 10 Ω || pF Ω || pF 103 dB 1.4 8 See Typical Curve 25 See Typical Curve MHz V/µs (V+) –4.4 (V–) +3.8 (V+) –3.8 (V–) +3.1 See SOA Curves ±4 V V V V ±35 ±22 –40 –40 Both Amplifiers, f > 50Hz Both Amplifiers, DC One Amplifier, f > 50Hz One Amplifier, DC No Heat Sink µs A ±35 ±30 +85 +125 2 2.5 2.7 3 30 V V mA °C °C °C/W °C/W °C/W °C/W °C/W NOTES: (1) High-speed test at TJ = +25°C. (2) Calculated from total power dissipation of both amplifiers. The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to change without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant any BURR-BROWN product for use in life support devices and/or systems. ® OPA2544 2 ABSOLUTE MAXIMUM RATINGS(1) CONNECTION DIAGRAM Front View 11-Lead Plastic Supply Voltage, V+ to V– ................................................................... 70V Output Current ................................................................. See SOA Curve Input Voltage .................................................... (V–) –0.7V to (V+) +0.7V Operating Temperature ................................................. –55°C to +125°C Storage Temperature ..................................................... –40°C to +125°C Junction Temperature ...................................................................... 150°C Lead Temperature (soldering, –10s) ............................................... 300°C Case connected to V– Supply. A NOTE: (1) Stresses above these ratings may cause permanent damage. B PACKAGE/ORDERING INFORMATION 1 PRODUCT PACKAGE PACKAGE DRAWING NUMBER(1) OPA2544T 11-Lead Plastic 242 11 NC V+ V– TEMPERATURE RANGE –40°C to +85°C NOTE: (1) For detailed drawing and dimension table, please see end of data sheet, or Appendix C of Burr-Brown IC Data Book. ELECTROSTATIC DISCHARGE SENSITIVITY This integrated circuit can be damaged by ESD. Burr-Brown recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications. ® 3 OPA2544 TYPICAL PERFORMANCE CURVES At TCASE = +25°C, VS = ±35V, unless otherwise noted. OPEN-LOOP GAIN AND PHASE vs FREQUENCY INPUT BIAS CURRENT vs TEMPERATURE 120 10n 100 –45 RL = 15Ω 60 –90 40 –135 20 –180 Phase (°) Gain (dB) 80 Input Bias Current (A) 0 1n IB 100p IOS 10p 0 –20 1p 1 10 100 1k 10k 100k 1M 10M –75 –50 –25 0 Frequency (Hz) 50 75 100 125 QUIESCENT CURRENT vs TEMPERATURE CURRENT LIMIT vs TEMPERATURE 26 5 Quiescent Current (mA) 4 Limit Current (A) 25 Temperature (°C) 3 2 1 –50 –25 0 25 50 75 100 VS = ±35V 22 VS = ±10V 20 18 –75 0 –75 24 125 –50 –25 0 25 50 75 100 125 Temperature (°C) Temperature (°C) VOLTAGE NOISE DENSITY vs FREQUENCY CHANNEL CROSSTALK vs FREQUENCY 100 0 9kΩ 80 1kΩ Crosstalk (dB) Voltage Noise (nV/ Hz) –20 60 40 20 –40 15Ω –60 9kΩ 1kΩ –80 VX –100 –120 10 1 10 100 1k 10k 10 100k ® OPA2544 100 1k 10k Frequency (Hz) Frequency (Hz) 4 100k 1M TYPICAL PERFORMANCE CURVES (CONT) At TCASE = +25°C and VS = ±35V, unless otherwise noted. POWER SUPPLY REJECTION vs FREQUENCY COMMON-MODE REJECTION vs FREQUENCY 120 100 Power Supply Rejection (dB) Common-Mode Rejection (dB) 110 90 80 70 60 50 100 V+ Supply 80 V– Supply 60 40 40 20 100 1k 10k Frequency (Hz) 100k 1M 1 10 GAIN-BANDWIDTH PRODUCT AND SLEW RATE vs TEMPERATURE 100 1k 10k Frequency (Hz) 100k 1M MAXIMUM OUTPUT VOLTAGE vs FREQUENCY 35 2.5 SR+ 8 1.5 SR– Output Voltage (V) 9 2.0 Slew Rate (V/µS) Gain-Bandwidth Product (MHz) Clipping 30 7 1.0 25 Slew Rate Limited 20 15 10 5 0.5 –75 –50 –25 0 25 50 75 100 0 6 125 20k 100k TOTAL HARMONIC DISTORTION + NOISE vs FREQUENCY OUTPUT VOLTAGE SWING vs OUTPUT CURRENT 5 10 RL = 15Ω (V+) – VO 100mW 4 |VSUPPLY| – |VOUT| (V) 2W 1 THD + N (%) 200k Frequency (Hz) Temperature (°C) 0.1 30W 0.01 3 |(V–) –VO| 2 1 0.001 0 20 100 1k 0 10k 20k 1 2 3 Output Current (A) Frequency (Hz) ® 5 OPA2544 TYPICAL PERFORMANCE CURVES (CONT) At TCASE = +25°C and VS = ±35V, unless otherwise noted. OUTPUT VOLTAGE SWING vs TEMPERATURE 6 IO = +2A |VSUPPLY| – |VOUT| (V) 5 IO = –2A 4 3 IO = +0.5A IO = –0.5A 2 1 0 –75 –50 –25 0 25 50 75 100 125 Temperature (°C) SMALL SIGNAL RESPONSE G = 3, CL = 1nF LARGE SIGNAL RESPONSE G = 3, RL = 15Ω 5V/div 200mV/div 2µs/div 5µs/div ® OPA2544 6 APPLICATIONS INFORMATION The safe output current decreases as VCE increases. Output short-circuit is a very demanding case for SOA. A shortcircuit to ground forces the full power supply voltage (V+ or V–) across the conducting transistor. With V S = ±35V the safe output current is 1.5A (at 25°C). The short-circuit current is approximately 4A which exceeds the SOA. This situation will activate the thermal shutdown circuit in the OPA2544. For further insight on SOA, consult AB-039. Figure 1 shows the OPA2544 connected as a basic noninverting amplifier. The OPA2544 can be used in virtually any op amp configuration. Power supply terminals should be bypassed with low series impedance capacitors. The technique shown, using a ceramic and tantalum type in parallel, is recommended. Power supply wiring should have low series impedance and inductance. CURRENT LIMIT The OPA2544 has an internal current limit set for approximately 4A. This current limit decreases with increasing junction temperature as shown in the typical curve, Current Limit versus Temperature. This, in combination with the thermal shutdown circuit, provides protection from many types of overload. It may not, however, protect for shortcircuit to ground, depending on the power supply voltage, ambient temperature, heat sink and signal conditions. +35V V+ 10µF G = 1+ + R2 =3 R1 0.1µF R1 5kΩ R2 10kΩ VO 1/2 OPA2544 VIN POWER DISSIPATION Power dissipation depends on power supply, signal and load conditions. For DC signals, power dissipation is equal to the product of output current times the voltage across the conducting output transistor. Power dissipation can be minimized by using the lowest possible power supply voltage necessary to assure the required output voltage swing. ZL 0.1µF 10µF + V– –35V For resistive loads, the maximum power dissipation occurs at a DC output voltage of one-half the power supply voltage. Dissipation with AC signals is lower. Application Bulletin AB-039 explains how to calculate or measure power dissipation with unusual signals and loads. FIGURE 1. Basic Circuit Connections. SAFE OPERATING AREA Stress on the output transistors is determined by the output current and the voltage across the conducting output transistor, VCE. The power dissipated by the output transistor is equal to the product of the output current and the voltage across the conducting transistor, VCE. The Safe Operating Area (SOA curve, Figure 2) shows the permissible range of voltage and current. HEATSINKING Most applications require a heat sink to assure that the maximum junction temperature is not exceeded. The heat sink required depends on the power dissipated and on ambient conditions. Consult Application Bulletin AB-038 for information on determining heat sink requirements. The heat sink tab of the plastic package is connected to the V– power supply terminal. Lowest thermal resistance can be achieved by mounting the tab directly to a heat sink. If the heat sink cannot be electrically “hot” at V– power supply potential, insulating hardware must be used. SAFE OPERATING AREA 10 Current-Limited Output Current (A) 4 TC = 25°C THERMAL PROTECTION Output current may be limited to less than 4A—see text. 1 The OPA2544 has thermal shutdown that protects the amplifier from damage. Any tendency to activate the thermal shutdown circuit during normal operation is indication of excessive power dissipation or an inadequate heat sink. TC = 85°C 0.4 TC = 125°C The thermal protection activates at a junction temperature of approximately 155°C. For reliable operation, junction temperature should be limited to 150°C, maximum. To estimate the margin of safety in a complete design (including heat sink), increase the ambient temperature until the thermal protection is activated. Use worst-case load and signal conditions. For good reliability, the thermal protec- 0.1 1 2 5 10 20 50 100 |VS – VO| (V) FIGURE 2. Safe Operating Area. ® 7 OPA2544 tion should trigger more than 25°C above the maximum expected ambient condition of your application. This produces a junction temperature of 125°C at the maximum expected ambient condition. OPA2544 are operated within their linear common-mode range, and that the output can swing to 0V. The V+ power supply could range from 15V to 63V. The total voltage (V– to V+) can range from 20V to 70V. With a 63V positive supply voltage, the device may not be protected from damage during short-circuits because of the larger VCE during this condition. Depending on load and signal conditions, the thermal protection circuit may produce a duty-cycle modulated output signal. This limits the dissipation in the amplifier, but the rapidly varying output waveform may be damaging to some loads. The thermal protection may behave differently depending on whether internal dissipation is produced by sourcing or sinking output current. OUTPUT PROTECTION Reactive and EMF-generating loads can return load current to the amplifier, causing the output voltage to exceed the power supply voltage. This damaging condition can be avoided with clamp diodes from the output terminal to the power supplies as shown in Figure 2. Fast-recovery rectifier diodes with a 4A or greater continuous rating are recommended. UNBALANCED POWER SUPPLIES Some applications do not require equal positive and negative output voltage swing. The power supply voltages of the OPA2544 do not need to be equal. For example, a –7V negative power supply voltage assures that the inputs of the R2 100kΩ V+ 20pF R1 5kΩ R2 20kΩ G=– R2 = –4 R1 R1 10kΩ VIN AV = –R2/R1 = –10 VIN 0.1Ω A D1 L 1/2 OPA2544 10kΩ Master 1Ω D2 Motor Paralleled operation not recommended for input signals that can cause amplifiers to slew. 0.01µF V– 20pF 0.1Ω B D1, D2 : Motorola MUR420 Fast Recovery Rectifier. Slave FIGURE 3. Motor Drive Circuit. FIGURE 5. Paralleled Operation, Extended SOA. +35V +35V 10kΩ 10kΩ 10kΩ 20kΩ 3nF 30Ω A VIN B 1kΩ Load ±10V 120Vp-p (±60V) G = +3 –35V FIGURE 4. Bridge Drive Circuit. ® OPA2544 G = –1 –35V 8