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OPA549

High-Voltage, High-Current

OPERATIONAL AMPLIFIER

DESCRIPTION

The OPA549 is a low-cost, high-voltage/high-current opera-

tional amplifier ideal for driving a wide variety of loads. This

laser-trimmed monolithic integrated circuit provides excellent

low-level signal accuracy and high output voltage and current.

The OPA549 operates from either single or dual supplies for

design flexibility. The input common-mode range extends

below the negative supply.

The OPA549 is internally protected against over-temperature

conditions and current overloads. In addition, the OPA549

provides an accurate, user-selected current limit. Unlike

other designs which use a “power” resistor in series with the

output current path, the OPA549 senses the load indirectly.

This allows the current limit to be adjusted from 0A to 10A

with a resistor/potentiometer, or controlled digitally with a

voltage-out or current-out Digital-to-Analog Converter (DAC).

The Enable/Status (E/S) pin provides two functions. It can be

monitored to determine if the device is in thermal shutdown,

and it can be forced low to disable the output stage and

effectively disconnect the load.

The OPA549 is available in an 11-lead power package. Its

copper tab allows easy mounting to a heat sink for excellent

thermal performance. Operation is specified over the ex-

tended industrial temperature range, –40°C to +85°C.

FEATURES

● HIGH OUTPUT CURRENT:

8A Continuous

10A Peak

● WIDE POWER-SUPPLY RANGE:

Single Supply: +8V to +60V

Dual Supply: ±4V to ±30V

● WIDE OUTPUT VOLTAGE SWING

● FULLY PROTECTED:

Thermal Shutdown

Adjustable Current Limit

● OUTPUT DISABLE CONTROL

● THERMAL SHUTDOWN INDICATOR

● HIGH SLEW RATE: 9V/µs

● CONTROL REFERENCE PIN

● 11-LEAD POWER PACKAGE

APPLICATIONS

● VALVE, ACTUATOR DRIVERS

● SYNCHRO, SERVO DRIVERS

● POWER SUPPLIES

● TEST EQUIPMENT

● TRANSDUCER EXCITATION

● AUDIO POWER AMPLIFIERS

OPA549

V+

E/S

sets the current limit

value from 0A to 10A.

(Very Low Power Dissipation)

LIM

V–

Ref

ES Pin

Forced Low: Output disabled.

Indicates Low: Thermal shutdown.

www.ti.com

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

SBOS093E – MARCH 1999 – REVISED OCTOBER 2005

All trademarks are the property of their respective owners.

Summary of content (19 pages)

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OPA549 OPA 549 OPA 549 SBOS093E – MARCH 1999 – REVISED OCTOBER 2005 High-Voltage, High-Current OPERATIONAL AMPLIFIER FEATURES DESCRIPTION ● HIGH OUTPUT CURRENT: 8A Continuous 10A Peak ● WIDE POWER-SUPPLY RANGE: Single Supply: +8V to +60V Dual Supply: ±4V to ±30V ● WIDE OUTPUT VOLTAGE SWING ● FULLY PROTECTED: Thermal Shutdown Adjustable Current Limit ● OUTPUT DISABLE CONTROL ● THERMAL SHUTDOWN INDICATOR ● HIGH SLEW RATE: 9V/µs ● CONTROL REFERENCE PIN ● 11-LEAD POWER PACKAGE The OPA549 is a low-cost,
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ABSOLUTE MAXIMUM RATINGS(1) ELECTROSTATIC DISCHARGE SENSITIVITY Output Current ................................................ See SOA Curve (Figure 6) Supply Voltage, V+ to V– ................................................................... 60V Input Voltage Range ....................................... (V–) – 0.5V to (V+) + 0.5V Input Shutdown Voltage ................................................... Ref – 0.5 to V+ Operating Temperature ..................................................
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ELECTRICAL CHARACTERISTICS Boldface limits apply over the specified temperature range, TA = –40°C to +85°C. At TCASE = +25°C, VS = ±30V, Ref = 0V, and E/S pin open, unless otherwise noted.
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TYPICAL CHARACTERISTICS At TCASE = +25°C, VS = ±30V, and E/S pin open, unless otherwise noted.
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TYPICAL CHARACTERISTICS (Cont.) At TCASE = +25°C, VS = ±30V, and E/S pin open, unless otherwise noted.
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TYPICAL CHARACTERISTICS (Cont.) At TCASE = +25°C, VS = ±30V, and E/S pin open, unless otherwise noted.
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TYPICAL CHARACTERISTICS (Cont.) At TCASE = +25°C, VS = ±30V, and E/S pin open, unless otherwise noted. LARGE-SIGNAL STEP RESPONSE G = 3, CL = 1000pF SMALL-SIGNAL OVERSHOOT vs LOAD CAPACITANCE 70 60 G = +1 40 10V/div Overshoot (%) 50 30 20 G = –1 10 0 0 5k 10k 15k 20k 25k 30k 5µs/div 35k Load Capacitance (pF) SMALL-SIGNAL STEP RESPONSE G = 3, CL = 1000pF 50mV/div 100mV/div SMALL-SIGNAL STEP RESPONSE G = 1, CL = 1000pF 2.5µs/div 2.5µs/div OPA549 SBOS093E www.ti.
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APPLICATIONS INFORMATION Figure 1 shows the OPA549 connected as a basic noninverting amplifier. The OPA549 can be used in virtually any op amp configuration. Power-supply terminals should be bypassed with low series impedance capacitors. The technique shown in Figure 1, using a ceramic and tantalum type in parallel, is recommended. Power-supply wiring should have low series impedance. Be sure to connect both output pins (pins 1 and 2). 10µF + 0.
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(a) RESISTOR METHOD (b) DAC METHOD (Current or Voltage) Max IO = ILIM ±ILIM = 7500Ω 4.75V (4.75) (15800) Max IO = ILIM 7500Ω + RCL ±ILIM =15800 ISET 8 6 RCL = Ref 15800 (4.75V) = ILIM 75kΩ ILIM 7500Ω 4.75V ISET 8 RCL 0.01µF (optional, for noisy environments) 6 – 7500Ω D/A Ref ISET = ILIM/15800 VSET = (Ref) + 4.75V – (7500Ω) (ILIM)/15800 – 7.5kΩ OPA549 CURRENT LIMIT: 0A to 10A DESIRED CURRENT LIMIT RESISTOR(1) (RCL) CURRENT (ISET) VOLTAGE (VSET) 0A(2) 2.
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Thermal Shutdown Status 20 The OPA549 has thermal shutdown circuitry that protects the amplifier from damage. The thermal protection circuitry disables the output when the junction temperature reaches approximately 160°C and allows the device to cool. When the junction temperature cools to approximately 140°C, the output circuitry is automatically re-enabled. Depending on load and signal conditions, the thermal protection circuit may cycle on and off.
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Use worst-case load and signal conditions. For good reliability, thermal protection should trigger more than 35°C above the maximum expected ambient condition of your application. This produces a junction temperature of 125°C at the maximum expected ambient condition. The internal protection circuitry of the OPA549 was designed to protect against overload conditions. It was not intended to replace proper heat sinking. Continuously running the OPA549 into thermal shutdown will degrade reliability.
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As mentioned earlier, once a heat sink has been selected, the complete design should be tested under worst-case load and signal conditions to ensure proper thermal protection. Any tendency to activate the thermal protection circuitry may indicate inadequate heat sinking. avoided with clamp diodes from the output terminal to the power supplies, as shown in Figure 8. Schottky rectifier diodes with a 8A or greater continuous rating are recommended.
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1kΩ 9kΩ = 10 1kΩ G=1+ +5V 10.5kΩ Output Adjust V+ = +30V V– = 0V 9kΩ 10kΩ 3 VO = 1V to 25V IO = 0 to 10A OPA549 0.12V to 2.5V 4 ILIM 8 6 9 E/S Ref R ≥ 250Ω 74HCT04 499Ω +5V V– 1kΩ Current Limit Adjust Thermal Shutdown Status 0V to 4.75V 20kΩ (LED) 0.01µF FIGURE 10. Resistor-Controlled Programmable Power Supply.
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R1 R2 VIN1 OPA549 OPA549 ILIM E/S Ref R3 VE/S VO R4 RCL1 VIN2 RCL2 Close for high current (could be open drain output of a logic gate). OPA549 E/S Limit output slew rates to ≤ 3V/µs (see text). FIGURE 13. Multiple Current Limit Values. FIGURE 12. Switched Amplifier. R2 4kΩ R1 1kΩ Master 0.1Ω OPA549 VIN ILIM Ref 20A Peak VO G=5 Slave 0.1Ω OPA549 ILIM Ref FIGURE 14. Parallel Output for Increased Output Current. 14 OPA549 www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 22-Oct-2013 Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties.
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