® OPA501 High Current, High Power OPERATIONAL AMPLIFIER FEATURES APPLICATIONS ● HIGH OUTPUT CURRENT: ±10A Peak ● MOTOR DRIVER ● WIDE POWER SUPPLY RANGE: ±10 to ±40V ● LOW QUIESCENT CURRENT: 2.6mA ● ISOLATED CASE TO-3 PACKAGE ● ● ● ● SERVO AMPLIFIER VALVE ACTUATOR SYNCRO DRIVER PROGRAMMABLE POWER SUPPLY DESCRIPTION V+ The OPA501 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 ±10A. Power supply voltages up to ±40V allow very high output power for driving motors or other electromechanical loads. 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 8-pin TO-3 package. Both industrial and military temperature range models are available. 3 2 +Output Drive + RCL 5 1 Current Sense 4 Output – RCL 8 –Output Drive 6 V– International Airport Industrial Park • Mailing Address: PO Box 11400 Tel: (520) 746-1111 • Twx: 910-952-1111 • Cable: BBRCORP • © 1983 Burr-Brown Corporation • Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd. • Tucson, AZ 85706 Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132 PDS-490F Printed in U.S.A. August, 1993 SPECIFICATIONS ELECTRICAL At TC = +25°C, VS = ±28V, (OPA501RM, AM); VS = ±34V (OPA501SM, BM) unless otherwise noted. OPA501RM, AM PARAMETER RATED OUTPUT(1, 2) Output Current Continuous(3) Output Voltage(3) DYNAMIC RESPONSE Bandwidth, Unity Gain Full Power Bandwidth Slew Rate INPUT OFFSET VOLTAGE Initial Offset vs Temperature CONDITIONS MIN RL = 2Ω (RM, AM) RL = 2.6Ω (SM, BM) IO = 10A peak ±10 ±10 ±20 Small Signal VO = 40Vp-p, RL = 8Ω RL = 5Ω (RM, AM) RL = 6.5Ω (SM, BM) 10 1.35 1.35 OPA501SM, BM MAX MIN * * ±26 ±23 1 16 ±5 ±10 –25°C < T < +85°C (AM, BM) –55°C < T < +125°C (RM, SM) * * * ±10 ±65 ±35 vs Supply Voltage INPUT BIAS CURRENT Initial vs Temperature vs Supply Voltage INPUT DIFFERENCE CURRENT Initial vs Temperature TYP TYP MAX UNITS A A V ±29 * * MHz kHz V/µs v/µs ±2 ±5 ±10 * ±40 mV µV/°C µV/°C µV/V TCASE = +25°C 15 ±0.05 ±0.02 40 * * * 20 nA nA/°C nA/V TCASE = +25°C –25°C < T < +85°C (AM, BM) –55°C < T < +125°C (RM, SM) ±5 ±0.01 ±10 ±2 ±3 ±0.01 nA nA/°C nA/°C 115 dB dB * * MΩ MΩ OPEN-LOOP GAIN, DC RL = 6.5Ω (SM, BM) RL = 5Ω (RM, AM) 94 98 INPUT IMPEDANCE Differential Common-mode INPUT NOISE Voltage Noise fn = 10Hz to 10kHz Current Noise fn = 10Hz to 10kHz INPUT VOLTAGE RANGE Common-mode Voltage(4) Common-mode Rejection 115 10 250 fn = 0.3Hz to 10Hz 3 * 5 fn = 0.3Hz to 10Hz 20 * 4.5 Linear Operation f = DC, VCM = ±(|VS|–6) POWER SUPPLY Rated Voltage Operating Voltage Range Current, quiescent ±(|VS|–6) 70 ±10 TEMPERATURE RANGE Specification, RM, SM AM, BM Operating, derated performance, AM, BM Storage case THERMAL RESISTANCE Steady State θJC µVrms * * ±(|VS|–3) 110 ±28 * 80 V dB V V mA * * * * °C °C * * * * °C °C * °C/W –55 –25 +125 +85 –55 –65 +125 +150 2.2 * * ±40 * * 2.0 pAp-p pArms ±34 ±36 ±10 ±2.6 µVp-p * * *Specification same as for OPA501RM, AM. NOTES: (1) Package must be derated based on a junction-to-case thermal resistance of 2.2°C/W or a junction-to-ambient thermal resistance of 30°C/W. (2) Safe Operating Area and Power Derating Curves must be observed. (3) With ±RSC = 0. Peak output current is typically greater than 10A if duty cycle and pulse width limitations are observed. Output current greater than 10A is not guaranteed. (4) 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. ® OPA501 2 ABSOLUTE MAXIMUM RATINGS CONNECTION DIAGRAM Power Supply Voltage (VS) ................................................................ ±40V Power Dissipation at +25°C(1, 2) .......................................................... 79W Differential Input Voltage ............................................................... ±VS –3V Common-Mode Input Voltage .............................................................. ±VS Operating Temperature Range ....................................... –55°C to +125°C Storage Temperature Range .......................................... –65°C to +150°C Lead Temperature (soldering, 10s) ................................................ +300°C Junction Temperature .................................................................... +200°C Output Short-Circuit Duration(3) ................................................ Continuous Top View + RSC +Output Drive V+ 3 +In NOTES: (1) At case temperature of +25°C. Derate at 2.2°C/W above case temperature of +25°C. (2) Average dissipation. (3) Within safe operating area and with appropriate derating. –In Current Sense 2 VO 1 4 – RSC 5 8 6 V– 7 NC –Output Drive ORDERING INFORMATION MODEL OPA501AM OPA501BM OPA501RM OPA501SM PACKAGE 8-Pin 8-Pin 8-Pin 8-Pin Metal Metal Metal Metal TO-3 TO-3 TO-3 TO-3 TEMPERATURE RANGE –25°C to +85°C –25°C to +85°C –55°C to +125°C –55°C to +125°C PACKAGE INFORMATION MODEL OPA501AM OPA501BM OPA501RM OPA501SM PACKAGE PACKAGE DRAWING NUMBER(1) 8-Pin Metal TO-3 8-Pin Metal TO-3 8-Pin Metal TO-3 8-Pin Metal TO-3 030 030 030 030 NOTE: (1) For detailed drawing and dimension table, please see end of data sheet, or Appendix D of Burr-Brown IC Data Book. ® 3 OPA501 TYPICAL PERFORMANCE CURVES Typical at +25°C case and ±VS = 28VDC, unless otherwise noted. COMMON MODE REJECTION vs FREQUENCY 100 –30 80 –60 Phase 60 –90 40 –120 Amplitude 20 120 –150 –180 0 –20 1 10 100 1k 10k 100k 1M Common-Mode Rejection (dB) 0 Phase (degree) Amplitude (dB) OPEN-LOOP FREQUENCY RESPONSE 120 100 80 60 40 20 0 –210 10M 1 10 100 Frequency (Hz) 2.8 100k 1M ±40 AV = 10 2.4 ±35 Output Voltage (Vpk) Input Bias Current (Normalized) 10k OUTPUT VOLTAGE SWING vs POWER SUPPLY VOLTAGE INPUT BIAS CURRENT vs TEMPERATURE 2.0 1.6 1.2 0.8 IO = 1A ±30 ±25 IO = 5A ±20 IO = 10A ±15 0.4 0 –50 ±10 –25 100 0 25 50 75 100 125 ±10 ±35 ±40 1.8 Total Harmonic Distortion (%) Maximum Output Maximum “Undistorted” Sine Wave Output RL = 8 Ω AV = +10 TC = +25°C 2 ±30 HARMONIC DISTORTION vs FREQUENCY 20 6 4 ±25 FULL POWER RESPONSE +VS = ±28V 10 ±20 Power Supply Voltage, VS (V) +VS = ±34V 40 ±15 Case Temperature (°C) 60 Output Voltage Swing (Vp-p) 1k Frequency (Hz) VO = 40Vp-p AV = +10 VS = ±28V 1.6 1.4 1.2 1.0 RL = 4 Ω 0.8 RL = 8 Ω 0.6 RL = 16Ω 0.4 RL = 50Ω 0.2 0 1 2 4 6 10 20 40 60 100 10 Frequency (kHz) Frequency (kHz) ® OPA501 102 4 103 104 TYPICAL PERFORMANCE CURVES (CONT) Typical at +25°C case and ±VS = 28VDC, unless otherwise noted. POWER DERATING CURVE CURRENT LIMIT RESISTOR vs LIMIT CURRENT 0.28 Current Limit Resistor, RSC (Ω) Internal Power Dissipation, PD (W) 120 100 80 θJC = 2.2°C/W 60 40 20 0 0.24 TC = +25°C 0.20 0.16 0.12 0.08 0.04 0 0 25 50 75 100 125 150 0 2 4 Case Temperature (°C) ±6 1.0 Normalized (θ JC) 1.2 RSC = 0.12Ω ±4 RSC = 0.28Ω ±2 10 12 14 0.8 0.6 0.4 0.2 ±1 0 –50 0 –25 0 25 50 75 100 125 0.1 1 10 100 1k 10k Frequency (Hz) Case Temperature (°C) PULSE RESPONSE, AV = +1 PULSE RESPONSE, AV = +1 Input/Output Voltage (5V/div) Input/Output Voltage (5V/div) Short Circuit Current (A) ±7 ±3 8 NORMALIZED THERMAL RESISTANCE vs FREQUENCY CURRENT LIMIT vs TEMPERATURE ±5 6 Limit Current (A) Time (10µs/div) Time (100µs/div) ® 5 OPA501 APPLICATIONS INFORMATION Figure 2, shows the permissible range of voltage and current. SOA is reduced at high operating temperature—see Figure 3. 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. The safe output current decreases as VCE 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 VS = ±30V, the current limit must be set for 2A to be safe for short-circuit to ground. For further information on SOA and evaluating signal and load conditions, consult Applications Bulletin AB-039. Power supply connections to the amplifier should be bypassed with 10µF tantalum capacitors connected close to the device pins. The capacitors should be connected to load ground as shown. HEAT SINKING Most applications require a heat sink to assure that the maximum junction temperature of 200°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-039 explains how to find maximum power dissipation for DC, AC, reactive loads, and other conditions. Applications Bulletin AB-038 shows how to determine heat sink requirements. R2 (1) + + RSC G=1+ R2 R1 OPA501 (1) VIN R1 – RSC + Load The case of the OPA501 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-037 for information on mounting techniques and procedures. NOTE: (1) 10µF Tantalum. V– V+ 10 8 6 4 FIGURE 1. Basic Circuit Connections. R SC = Output Current (A) CURRENT LIMITS The OPA501 has independent positive and negative current limit circuits. Current limits are set by the value of R+SC and R–SC. The approximate value of these resistors is: 0.65 − 0. 0437Ω I LIMIT 1ms 0.5ms Maximum Specified Current 2 1.0 0.8 0.6 Power Dissipation Limit Second Breakdown Limit TCASE = +25°C TJUNCTION = +200°C θJC = 2.2°C/W 0.4 Maximum RM, AM Specified Voltage SM, BM 0.2 ILIMIT is the desired maximum current at room temperature in Amperes and RSC 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: 5ms DC 0.1 1 2 4 6 8 10 20 40 60 80100 Voltage Across Output Transistor (V) FIGURE 2. Transistor Safe Operating Area at +25°C Case Temperature. P MAX = (I LIMIT )2 R SC 10 8 6 4 Output Current (A) 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, VCE. The Safe Operating Area (SOA), 2 0.5ms 5ms Maximum Specified Current 1ms DC 1.0 0.8 TCASE = +125°C TJUNCTION = +200°C 0.6 θ = 2.2°C/W JC Maximum RM, AM 0.4 Specified 0.2 Voltage SM, BM 0.1 1 2 4 6 8 10 20 40 60 80100 Voltage Across Output Transistor (V) FIGURE 3. Transistor Safe Operating Area at +125°C Case Temperature. ® OPA501 6