High Current, High Power OPERATIONAL AMPLIFIER

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1 OPA51 High, High Power OPERATIONAL AMPLIFIER FEATURES HIGH OUTPUT CURRENT: ±1A Peak WIDE POWER SUPPLY RANGE: ±1 to ±V LOW QUIESCENT CURRENT:.mA ISOLATED CASE TO-3 PACKAGE APPLICATIONS MOTOR DRIVER SERVO AMPLIFIER VALVE ACTUATOR SYNCRO DRIVER PROGRAMMABLE POWER SUPPLY DESCRIPTION V The OPA51 is a high output current operational amplifier. It can be used in virtually all common op amp circuits, yet is capable of output currents up to ±1A. Power supply voltages up to ±V allow very high output power for driving motors or other electromechanical loads. 3 Safe operating area is fully specified, and user-set current limits provide protection for both the amplifier and load. The class-b (zero output stage bias) provides low quiescent current during small-signal conditions. This rugged hybrid integrated circuit is packaged in a metal -pin TO-3 package. Both industrial and military temperature range models are available. 5 1 Sense Output R CL Output R CL Output V International Airport Industrial Park Mailing Address: PO Box 11 Tucson, AZ 573 Street Address: 73 S. Tucson Blvd. Tucson, AZ 57 Tel: (5) Twx: Cable: BBRCORP Telex: -91 FAX: (5) Immediate Product Info: () Burr-Brown Corporation PDS-9F Printed in U.S.A. August, 1993

2 SPECIFICATIONS ELECTRICAL At T C = 5 C, V S = ±V, (OPA51RM, AM); V S = ±3V (OPA51SM, BM) unless otherwise noted. OPA51RM, AM OPA51SM, BM PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS RATED OUTPUT (1, ) Output R L = Ω (RM, AM) ±1 * A Continuous (3) R L =.Ω (SM, BM) ±1 * A Output Voltage (3) I O = 1A peak ± ±3 ± ±9 V DYNAMIC RESPONSE Bandwidth, Unity Gain Small Signal 1 * MHz Full Power Bandwidth V O = Vp-p, R L = Ω 1 1 * * khz Slew Rate R L = 5Ω (RM, AM) 1.35 * V/µs R L =.5Ω (SM, BM) 1.35 * v/µs INPUT OFFSET VOLTAGE Initial Offset ±5 ±1 ± ±5 mv vs Temperature 5 C < T < 5 C (AM, BM) ±1 ±5 µv/ C 55 C < T < 15 C (RM, SM) ±1 ± µv/ C vs Supply Voltage ±35 * µv/v INPUT BIAS CURRENT Initial T CASE = 5 C 15 * na vs Temperature ±.5 * na/ C vs Supply Voltage ±. * na/v INPUT DIFFERENCE CURRENT Initial T CASE = 5 C ±5 ±1 ± ±3 na vs Temperature 5 C < T < 5 C (AM, BM) ±.1 na/ C 55 C < T < 15 C (RM, SM) ±.1 na/ C OPEN-LOOP GAIN, DC R L = 5Ω (RM, AM) db R L =.5Ω (SM, BM) db INPUT IMPEDANCE Differential 1 * MΩ Common-mode 5 * MΩ INPUT NOISE Voltage Noise f n =.3Hz to 1Hz 3 * µvp-p f n = 1Hz to 1kHz 5 * µvrms Noise f n =.3Hz to 1Hz * pap-p f n = 1Hz to 1kHz.5 * parms INPUT VOLTAGE RANGE Common-mode Voltage () Linear Operation ±( V S ) ±( V S 3) * * V Common-mode Rejection f = DC, V CM = ±( V S ) 7 11 * db POWER SUPPLY Rated Voltage ± ±3 V Operating Voltage Range ±1 ±3 * ± V, quiescent ±. ±1 * * ma TEMPERATURE RANGE case Specification, RM, SM * * C AM, BM 5 5 * * C Operating, derated performance, AM, BM * * C Storage 5 15 * * C THERMAL RESISTANCE Steady State θ JC.. * * C/W *Specification same as for OPA51RM, AM. NOTES: (1) Package must be derated based on a junction-to-case thermal resistance of. C/W or a junction-to-ambient thermal resistance of 3 C/W. () Safe Operating Area and Power Derating Curves must be observed. (3) With ± =. Peak output current is typically greater than 1A if duty cycle and pulse width limitations are observed. Output current greater than 1A is not guaranteed. () The absolute maximum voltage is 3V less than supply voltage. 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. OPA51

3 ABSOLUTE MAXIMUM RATINGS CONNECTION DIAGRAM Power Supply Voltage (V S )... ±V Power Dissipation at 5 C (1, )... 79W Differential Input Voltage... ±V S 3V Common-Mode Input Voltage... ±V S Operating Temperature Range C to 15 C Storage Temperature Range... 5 C to 15 C Lead Temperature (soldering, 1s)... 3 C Junction Temperature... C Output Short-Circuit Duration (3)... Continuous NOTES: (1) At case temperature of 5 C. Derate at. C/W above case temperature of 5 C. () Average dissipation. (3) Within safe operating area and with appropriate derating. ORDERING INFORMATION Top View In In 5 V 3 V 7 NC Output 1 Output Sense TEMPERATURE USA OEM PRICES MODEL PACKAGE RANGE OPA51AM -Pin Metal TO-3 5 C to 5 C $. $5.35 $35.5 OPA51BM -Pin Metal TO-3 5 C to 5 C OPA51RM -Pin Metal TO-3 55 C to 15 C OPA51SM -Pin Metal TO-3 55 C to 15 C V O PACKAGE INFORMATION PACKAGE DRAWING MODEL PACKAGE NUMBER (1) OPA51AM -Pin Metal TO-3 3 OPA51BM -Pin Metal TO-3 3 OPA51RM -Pin Metal TO-3 3 OPA51SM -Pin Metal TO-3 3 NOTE: (1) For detailed drawing and dimension table, please see end of data sheet, or Appendix D of Burr-Brown IC Data Book. 3 OPA51

4 TYPICAL PERFORMANCE CURVES Typical at 5 C case and ±V S = VDC, unless otherwise noted. 1 OPEN-LOOP FREQUENCY RESPONSE 1 COMMON MODE REJECTION vs FREQUENCY Amplitude (db) 1 Amplitude Phase Phase (degree) Common-Mode Rejection (db) k 1k 1k 1M 1M Frequency (Hz) k 1k 1k 1M Frequency (Hz) Input Bias (Normalized) INPUT BIAS CURRENT vs TEMPERATURE Output Voltage (Vpk) ± ±35 ±3 ±5 ± ±15 OUTPUT VOLTAGE SWING vs POWER SUPPLY VOLTAGE I O = 1A I O = 1A A V = 1 I O = 5A Case Temperature ( C) ±1 ±1 ±15 ± ±5 ±3 ±35 ± Power Supply Voltage, V S (V) Output Voltage Swing (Vp-p) 1 1 V S = ±V FULL POWER RESPONSE V S = ±3V Maximum Undistorted Sine Wave Output R L = Ω A V = 1 T C = 5 C Maximum Output Total Harmonic Distortion (%) HARMONIC DISTORTION vs FREQUENCY V O = Vp-p A V = 1 V S = ±V R L = Ω R L = Ω R L = 1Ω R L = 5Ω 1 1 Frequency (khz) Frequency (khz) OPA51

5 TYPICAL PERFORMANCE CURVES (CONT) Typical at 5 C case and ±V S = VDC, unless otherwise noted. 1 POWER DERATING CURVE. CURRENT LIMIT RESISTOR vs LIMIT CURRENT Internal Power Dissipation, P D (W) 1 θ JC =. C/W Limit Resistor, (Ω) T C = 5 C Case Temperature ( C) Limit (A) ±7 CURRENT LIMIT vs TEMPERATURE PULSE RESPONSE, A V = 1 PULSE RESPONSE, A V = 1 Input/Output Voltage (5V/div) Input/Output Voltage (5V/div) 1. NORMALIZED THERMAL RESISTANCE vs FREQUENCY Short Circuit (A) ± ±5 ± ±3 ± ±1 =.1Ω =.Ω Normalized ( θ JC ) Case Temperature ( C) k 1k Frequency (Hz) Time (1µs/div) Time (1µs/div) 5 OPA51

6 APPLICATIONS INFORMATION Grounding techniques can greatly affect the performance of a power op amp. Figure 1 shows grounds connected so that load current does not flow through signal ground connections. Power supply and load connections should be physically separated from the amplifier input and signal connections. Power supply connections to the amplifier should be bypassed with 1µF tantalum capacitors connected close to the device pins. The capacitors should be connected to load ground as shown. V IN R 1 FIGURE 1. Basic Circuit Connections. CURRENT LIMITS The OPA51 has independent positive and negative current limit circuits. limits are set by the value of R SC and R SC. The approximate value of these resistors is: =.5.37Ω I LIMIT I LIMIT is the desired maximum current at room temperature in Amperes and is in ohms. The current limit value decreases with increasing temperature see typical performance curves. The current limit resistors conduct the full amplifier output current. Power dissipation of the current limit resistors at maximum current is: The current limit resistors can be chosen from a variety of types. Most wire-wound types are satisfactory, although some physically large resistors may have excessive inductance which can cause instability. SAFE OPERATING AREA Stress on the output transistor is determined by the output current and the voltage across the conducting output transistor. The power dissipated by the output transistor is equal to the product of the output current and the voltage across the conducting transistor, V CE. The Safe Operating Area (SOA), OPA51 (1) R (1) P MAX = (I LIMIT ) OPA51 V V G = 1 R R 1 Load NOTE: (1) 1µF Tantalum. Figure, shows the permissible range of voltage and current. SOA is reduced at high operating temperature see Figure 3. The safe output current decreases as V CE increases. Output short-circuits are very demanding. A short-circuit to ground forces the full power supply voltage (positive or negative side) across the conducting transistor. With V S = ±3V, the current limit must be set for A to be safe for short-circuit to ground. For further information on SOA and evaluating signal and load conditions, consult Applications Bulletin AB-39. HEAT SINKING Most applications require a heat sink to assure that the maximum junction temperature of C is not exceeded. The size of the heat sink required depends on the power dissipated by the amplifier and ambient temperature conditions. Application Bulletin AB-39 explains how to find maximum power dissipation for DC, AC, reactive loads, and other conditions. Applications Bulletin AB-3 shows how to determine heat sink requirements. The case of the OPA51 is isolated from all circuitry and can be fastened directly to a heat sink. This eliminates cumbersome insulating hardware that degrades thermal performance. See Applications Bulletin AB-37 for information on mounting techniques and procedures. Output (A) Maximum DC Power Dissipation Limit Second Breakdown Limit 5ms 1ms.5ms T CASE = 5 C. T JUNCTION = C JC =. C/W Maximum RM, AM. Voltage SM, BM Voltage Across Output Transistor (V) FIGURE. Transistor Safe Operating Area at 5 C Case Temperature. Output (A) Maximum DC T CASE = 15 C T JUNCTION = C θ JC =. C/W 5ms.5ms 1ms. Maximum RM, AM. Voltage SM, BM Voltage Across Output Transistor (V) FIGURE 3. Transistor Safe Operating Area at 15 C Case Temperature.

7 PACKAGE DRAWING 7 OPA51

High Current High Power OPERATIONAL AMPLIFIER

OPA High Current High Power OPERATIONAL AMPLIFIER FEATURES WIDE SUPPLY RANGE: ±V to ±V HIGH OUTPUT CURRENT: A Peak CLASS A/B OUTPUT STAGE: Low Distortion SMALL TO- PACKAGE APPLICATIONS SERVO AMPLIFIER