High Current, High Power OPERATIONAL AMPLIFIER HIGH OUTPUT CURREN
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OPA502
High Current, High Power OPERATIONAL AMPLIFIER
HIGH OUTPUT CURRENT: WIDE POWER SUPPLY VOLTAGE: ±10V ±45V USER-SET CURRENT LIMIT SLEW RATE: 10V/µs INPUT: 200pA CLASS OUTPUT STAGE QUIESCENT CURRENT: 25mA HERMETIC TO-3 PACKAGE ISOLATED CASE
APPLICATIONS
MOTOR DRIVER SERVO AMPLIFIER PROGRAMMABLE POWER SUPPLY ACTUATOR DRIVER AUDIO AMPLIFIER TEST EQUIPMENT
DESCRIPTION
OPA502 high output current operational amplifier designed drive wide range resistive reactive loads. complementary class output stage provides superior performance applications requiring freedom from crossover distortion. Resistor-programmable current limits provide protection both amplifier load during abnormal operating conditions. adjustable foldover current limit also used protect against potentially damaging conditions. OPA502 employs custom monolithic amp/ driver circuit rugged complementary output transistors, providing excellent dynamic performance. industry-standard 8-pin TO-3 package electrically isolated from circuitry. This allows OPA502 mounted directly heat sink without cumbersome insulating hardware which degrade thermal performance. OPA502 available -40°C +85°C temperature range.
+Output Drive
Bias Circuit
Current Sense Output Drive
International Airport Industrial Park Mailing Address: 11400, Tucson, 85734 Street Address: 6730 Tucson Blvd., Tucson, 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
1992 Burr-Brown Corporation
PDS-1166B
Printed U.S.A. OPA502 March, 1998
SPECIFICATIONS
TCASE +25°C, ±40V, unless otherwise noted. OPA502BM PARAMETER OFFSET VOLTAGE Input Offset Voltage Temperature Power Supply INPUT BIAS CURRENT(1) Input Bias Current Input Offset Current NOISE Input Voltage Noise Noise Density, Current Noise Density, INPUT VOLTAGE RANGE Common-Mode Input Range, Positive Negative Common-Mode Rejection INPUT IMPEDANCE Differential Common-Mode OPEN-LOOP GAIN Open-Loop Voltage Gain FREQUENCY RESPONSE Gain-Bandwidth Product Slew Rate Full-Power Bandwidth Total Harmonic Distortion Capacitive Load OUTPUT Voltage Output, Positive Negative Positive Negative Current Output Short Circuit Current POWER SUPPLY Specified Operating Voltage Operating Voltage Range Quiescent Current TEMPERATURE RANGE Specification Storage Thermal Resistance, (V+) (V-) ±34V, +10, 68Vp-p, 20kHz 20V, CONDITION ±0.5 UNITS µV/°C
Specified Temp. Range ±10V ±45V
1kHz 1kHz Linear Operation Linear Operation ±35V (V+) (V-)
(V+) (V-) 1012 1012 Typical Curves 0.06 Figure (V+)-3.5 (V-) +3.6 (V+) -2.5 (V-) +3.1 Curves Resistor Programmed
nV/Hz fA/Hz V/µs
50Hz Heat Sink
+125
°C/W °C/W °C/W
NOTE: High-speed test 25°C.
1.25
ABSOLUTE MAXIMUM RATINGS(1)
Supply Voltage, Output Current Curve Input Voltage (V-) (V+)+1V Case Temperature, Operating 150°C Junction Temperature 200°C NOTE: Stresses above these ratings cause permanent damage.
PACKAGE/ORDERING INFORMATION
PACKAGE DRAWING NUMBER(1) TEMPERATURE RANGE -40°C +85°C
PRODUCT OPA502BM
PACKAGE 8-Pin TO-3
NOTE: detailed drawing dimension table, please data sheet, Appendix Burr-Brown Data Book.
information provided herein believed reliable; however, BURR-BROWN assumes responsibility inaccuracies omissions. BURR-BROWN assumes responsibility this information, such information shall entirely user's risk. Prices specifications subject change without notice. patent rights licenses circuits described herein implied granted third party. BURR-BROWN does authorize warrant BURR-BROWN product life support devices and/or systems.
OPA502
CONFIGURATION
View TO-3
ELECTROSTATIC DISCHARGE SENSITIVITY
This integrated circuit damaged ESD. Burr-Brown recommends that integrated circuits handled with appropriate precautions. Failure observe proper handling installation procedures cause damage. damage range from subtle performance degradation complete device failure. Precision integrated circuits more susceptible damage because very small parametric changes could cause device meet published specifications.
+Output Drive Current Sense
-Output Drive
TYPICAL PERFORMANCE CURVES
TCASE +25°C, ±40V, unless otherwise noted.
CURRENT LIMIT LIMIT RESISTOR
CURRENT LIMIT TEMPERATURE 0.24 0.22 0.20
-ICL
+ICL
NOTE: These average values. -ICL typically higher. +ICL typically lower.
0.16 0.14 0.12 0.10
0.10 0.01 0.10
Case Temperature (°C)
OPEN-LOOP GAIN PHASE FREQUENCY
Voltage Gain (dB)
SUPPLY CURRENT TEMPERATURE
Supply Current (mA) Phase (degrees)
100k
-135 -180
±45V
Frequency (Hz) Case Temperature (°C)
OPA502
0.18
TYPICAL PERFORMANCE CURVES
TCASE +25°C, ±40V, unless otherwise noted.
(CONT)
INPUT BIAS OFFSET CURRENTS TEMPERATURE 10nA
INPUT BIAS CURRENT INPUT COMMON-MODE VOLTAGE
Input Bias Offset Current (pA)
Normalized (IB)
Case Temperature (°C) Common-Mode Voltage
VOLTAGE NOISE DENSITY FREQUENCY
Voltage Noise (nV/
GAIN BANDWIDTH PRODUCT TEMPERATURE
GBWP (MHz)
100k Frequency (Hz)
Case Temperature (°C)
POWER SUPPLY REJECTION FREQUENCY
COMMON-MODE REJECTION FREQUENCY
CMRR (dB)
Frequency (Hz) 100k
PSRR (dB)
Frequency (Hz) 100k
OPA502
TYPICAL PERFORMANCE CURVES
TCASE +25°C, ±40V, unless otherwise noted.
(CONT)
SLEW RATE TEMPERATURE
FULL POWER RESPONSE
Output Voltage (VPK)
Slew Rate (V/µs)
34VPK
100k Frequency (Hz)
Case Temperature (°C)
TOTAL HARMONIC DISTORTION NOISE FREQUENCY 1.000 Measurement 80kHz
OUTPUT VOLTAGE SWING OUTPUT CURRENT
0.100
|±VS| |VOUT|
100mW
(+VS) |-VS| |VO|
0.010
0.001 Frequency (Hz)
IOUT
OUTPUT VOLTAGE SWING TEMPERATURE
|±VS| |VO|
+10A -10A
Case Temperature (°C)
OPA502
TYPICAL PERFORMANCE CURVES
TCASE +25°C, ±40V, unless otherwise noted.
(CONT)
LARGE SIGNAL RESPONSE
SMALL SIGNAL RESPONSE 1000pF
APPLICATIONS INFORMATION
+40V
Power supply terminals should bypassed with series impedance capacitors such ceramic tantalum close device pins. Power supply wiring should have series impedance inductance. Figure indicates high current connections bold lines. Current limit with external resistors-one positive output current negative output current (see Figure conventional current limit, independent output voltage, should left open (see "Foldback Current Limit"). Limiting occurs when output current causes sufficient voltage drop across turn respective current limit transistor. limit current decreases high temperature (see typical performance curve "Current Limit Temperature). Figure also shows nominal current limit produced standard resistor values. also typical performance curve "Current Limit Limit Resistance". output current must flow through this resistor, power rating must chosen accordingly. table Figure shows power dissipation current limit resistor during continuous current limit (room temperature). Connections from current limit resistors device pins typically 0.02 0.05 effective value RCL. This significantly affects current limit value high output currents. current limit resistors chosen from variety types. Most common wire-wound types satisfactory, although some physically large types have excessive inductance which cause problems. should test your circuits with exact resistor type planned production use. different current limits positive negative current. Resistors chosen with same table values Figure SAFE OPERATING AREA Stress output transistors determined output current voltage across conducting output transis
0.1µF
OPA502 0.1µF
G=1+
Load
-40V
NOTE: Bold lines indicate high current paths.
0.68 0.15
25°C 0.11 0.19 0.44 0.78 1.22 1.65 2.73
Power Dissipation1 0.12 0.18 0.39 0.61
NOTE Power dissipation during continuous current limit TCASE +25°C.
FIGURE Basic Circuit Connections.
tor. power dissipated output transistor equal product output current voltage across conducting transistor, VCE. Safe Operating Area (SOA curve, Figure shows permissible range voltage current.
OPA502
safe output current decreases increases. Output short-circuits very demanding case SOA. shortcircuit ground forces full power supply voltage across conducting transistor. With ±40V current limit must (25°C) safe continuous short-circuit ground. further insight SOA, consult AB-039.
circuit allow high output current when (high output voltage). Output current limits lower value under more stressful condition when high, (output voltage low). behavior this voltage-dependant current limit described following equation.
0.81 0.28 0.03
SAFE OPERATING AREA +25°C +85°C
ILIMIT
where: output voltage measured with respect ground. resistor connected from ground ohms). current limit resistor ohms).
Ther Limitation 200°C) VOUT| Second Breakdown Limited
foldover limit circuitry allow large voltage current resistive loads, limit output current safe value with output short circuit. Reactive EMF-generating loads produce unexpected behavior with foldover circuit driven into limiting. With reactive load, peak output current occurs zero output voltage. Compared resistive load, reactive load with same total impedance will more likely activate foldover limit circuitry.
FIGURE Safe Operating Area (SOA).
UNBALANCED POWER SUPPLIES Some applications require equal positive negative output voltage swing. power supply voltages OPA502 need equal. Figure shows circuit designed positive output voltage current. power supply voltage assures that inputs OPA502 operated within their linear common-mode range. power supply could range from 85V. total voltage range from 90V.
Fast Recovery Diode 100V MR821
OPA502 Inductive EMF-Generating Load
0.5A 0.5A 50mA
MR821
FIGURE Diode Protection Output. OUTPUT PROTECTION output stage OPA502 protected internal diode clamps power supply terminals. These internal diodes similar common silicon rectifier types fast enough adequate protection. loads that deliver large reverse kickback current (greater than output, external fast-recovery clamp diodes recommended (Figure these diodes (internal external) provide intended protection, power supplies must provide impedance reverse current.
OPA502
FIGURE Unbalanced Power Supplies. FOLDOVER CURRENT LIMIT connecting resistor from ground, make limit current vary with output voltage. foldover limit
OPA502
COMPENSATION STABILITY Capacitance inverting input causes high frequency pole feedback path. This reduces phase margin, causing pulse response ringing, severe cases, oscillations. value feedback capacitor reduce eliminate this effect maintaining constant feedback factor high frequency (see Figure Depending load conditions, precautions required when using OPA502 gains. Gains less than +3V/V -2V/V cause oscillations, particularly with capacitive loads. Figure shows several circuits gain capacitive loads. Large value feedback capacitors used limit closed-loop bandwidth form integrator also produce instability because closed-loop gain approaches unity high frequency.
MOUNTING HEAT SINKING Most applications require heat sink assure that maximum junction temperature exceeded. heat sink required depends power dissipated ambient conditions. Consult Application Bulletin AB-038 information determining heat sink requirements. case OPA502 isolated from circuitry fastened directly heat sink. This eliminates cumbersome insulating hardware that degrades thermal performance. Consult Application Bulletin AB-037 proper mounting techniques procedures TO-3 power products. SOCKET mating socket, 0804MC available OPA502 purchased from Burr-Brown. Although required, this socket makes interchanging parts easy, especially during design testing.
OPA502
Input capacitance, package wiring 20pF
FIGURE Compensating Input Capacitance.
OPA502
470pF OPA502
0.01µF
OPA502 0.1µF
Prevents phase-inversion circuits IN4148 470pF 2200pF OPA502
FIGURE Compensation Circuits.
OPA502
10pF 47pF
OPA502 OPA27 100k ±15V 4.7k ±40V 0.02% 20kHz 0.002% 1kHz
FIGURE Distortion Composite Amplifier.
+35V
+35V
OPA502 ±10V 120Vp-p (±60V) -35V Load
OPA502
-35V
FIGURE Bridge Drive Circuit.
+30V
REF102 +30V
20pF 8-bit data port bits) 0-1mA
OPA602 DAC7801 12-bit M-DAC 4.7k 470pF OPA502 ±20V
-30V
FIGURE Digitally Programmable Power Supply.
OPA502
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