Datasheet

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LM1875

www.ti.com

SNAS524A –MAY 2004–REVISED MAY 2004

LM1875 20W Audio Power Amplifier

Check for Samples: LM1875

FEATURES

DESCRIPTION

The LM1875 is a monolithic power amplifier offering

• Up to 30 Watts Output Power

very low distortion and high quality performance for

• A

Typically 90 dB

consumer audio applications.

• Low Distortion: 0.015%, 1 kHz, 20 W

The LM1875 delivers 20 watts into a 4Ω or 8Ω load

• Wide Power Bandwidth: 70 kHz

on ±25V supplies. Using an 8Ω load and ±30V

• Protection for AC and DC Short Circuits to

supplies, over 30 watts of power may be delivered.

The amplifier is designed to operate with a minimum

Ground

of external components. Device overload protection

• Thermal Protection with Parole Circuit

consists of both internal current limit and thermal

• High Current Capability: 4A

shutdown.

• Wide Supply Range 16V-60V

The LM1875 design takes advantage of advanced

• Internal Output Protection Diodes

circuit techniques and processing to achieve

extremely low distortion levels even at high output

• 94 dB Ripple Rejection

power levels. Other outstanding features include high

• Plastic Power Package TO-220

gain, fast slew rate and a wide power bandwidth,

large output voltage swing, high current capability,

APPLICATIONS

and a very wide supply range. The amplifier is

• High Performance Audio Systems internally compensated and stable for gains of 10 or

greater.

• Bridge Amplifiers

• Stereo Phonographs

• Servo Amplifiers

• Instrument Systems

Connection Diagram

Figure 1. NDH0005D, KC0005A,

NEB0005E, NEB0005B,

Front View

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.

2All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (16 pages)

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LM1875 www.ti.com SNAS524A – MAY 2004 – REVISED MAY 2004 LM1875 20W Audio Power Amplifier Check for Samples: LM1875 FEATURES DESCRIPTION • • • • • The LM1875 is a monolithic power amplifier offering very low distortion and high quality performance for consumer audio applications. 1 2 • • • • • • Up to 30 Watts Output Power AVO Typically 90 dB Low Distortion: 0.
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LM1875 SNAS524A – MAY 2004 – REVISED MAY 2004 www.ti.com Typical Applications These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
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LM1875 www.ti.com SNAS524A – MAY 2004 – REVISED MAY 2004 Electrical Characteristics VCC=+25V, −VEE=−25V, TAMBIENT=25°C, RL=8Ω, AV=20 (26 dB), fo=1 kHz, unless otherwise specified. Parameter Conditions Typical Tested Limits Units 100 mA Supply Current POUT=0W 70 Output Power (1) THD=1% 25 THD (1) POUT=20W, fo=1 kHz 0.015 POUT=20W, fo=20 kHz 0.05 POUT=20W, RL=4Ω, fo=1 kHz 0.022 POUT=20W, RL=4Ω, fo=20 kHz 0.07 0.6 % ±1 ±15 mV ±0.2 ±2 μA 0 ±0.
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LM1875 SNAS524A – MAY 2004 – REVISED MAY 2004 www.ti.com Typical Performance Characteristics THD vs Power Output THD vs Frequency Figure 3. Figure 4. Power Output vs Supply Voltage Supply Current vs Supply Voltage Figure 5. Figure 6. PSRR vs Frequency Device Dissipation vs Ambient Temperature† †φINTERFACE = 1°C/W. See Application Hints. Figure 7. 4 Figure 8.
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LM1875 www.ti.com SNAS524A – MAY 2004 – REVISED MAY 2004 Typical Performance Characteristics (continued) Power Dissipation vs Power Output Power Dissipation vs Power Output Figure 9. Figure 10. IOUT vs VOUT-Current Limit/ Safe Operating Area Boundary Open Loop Gain and Phase vs Frequency Figure 11. Thermal shutdown with infinite heat sink Thermal shutdown with 1°C/W heat sink Figure 12. Input Bias Current vs Supply Voltage Figure 13.
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LM1875 SNAS524A – MAY 2004 – REVISED MAY 2004 www.ti.
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LM1875 www.ti.com SNAS524A – MAY 2004 – REVISED MAY 2004 APPLICATION HINTS STABILITY The LM1875 is designed to be stable when operated at a closed-loop gain of 10 or greater, but, as with any other high-current amplifier, the LM1875 can be made to oscillate under certain conditions. These usually involve printed circuit board layout or output/input coupling. Proper layout of the printed circuit board is very important.
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LM1875 SNAS524A – MAY 2004 – REVISED MAY 2004 www.ti.com THERMAL PROTECTION The LM1875 has a sophisticated thermal protection scheme to prevent long-term thermal stress to the device. When the temperature on the die reaches 170°C, the LM1875 shuts down. It starts operating again when the die temperature drops to about 145°C, but if the temperature again begins to rise, shutdown will occur at only 150°C.
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LM1875 www.ti.com SNAS524A – MAY 2004 – REVISED MAY 2004 NOTE When using a single supply, maximum transfer of heat away from the LM1875 can be achieved by mounting the device directly to the heat sink (tab is at ground potential); this avoids the use of a mica or other type insulator. The thermal requirements can become more difficult when an amplifier is driving a reactive load.
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LM1875 SNAS524A – MAY 2004 – REVISED MAY 2004 www.ti.com Figure 15.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 11-Apr-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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MECHANICAL DATA NDH0005D www.ti.
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MECHANICAL DATA NEB0005B www.ti.
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MECHANICAL DATA NEB0005E www.ti.
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