Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsLinear ICsLinear IC - Audio amplifier 2-channel (stereo) Class AB TO 220 15

LM4766

www.ti.com

SNAS031F –SEPTEMBER 1998–REVISED MARCH 2013

LM4766 Overture™ Audio Power Amplifier Series

Dual 40W Audio Power Amplifier with Mute

Check for Samples: LM4766

FEATURES

DESCRIPTION

The LM4766 is a stereo audio amplifier capable of

• SPiKe Protection

delivering typically 40W per channel with the non-

• Minimal Amount of External Components

isolated "NDL" package and 30W per channel with

Necessary

the isolated "NDB" package of continuous average

• Quiet Fade-In/Out Mute Mode

output power into an 8Ω load with less than 0.1%

(THD+N).

• Non-Isolated 15-Lead TO-220 Package

The performance of the LM4766, utilizing its Self

• Wide Supply Range 20V - 78V

Peak Instantaneous Temperature (°Ke) (SPiKe)

Protection Circuitry, places it in a class above

APPLICATIONS

discrete and hybrid amplifiers by providing an

• High-End Stereo TVs

inherently, dynamically protected Safe Operating

• Component Stereo Area (SOA). SPiKe Protection means that these parts

are safeguarded at the output against overvoltage,

• Compact Stereo

undervoltage, overloads, including thermal runaway

and instantaneous temperature peaks.

KEY SPECIFICATIONS

Each amplifier within the LM4766 has an independent

• THD+N at 1kHz at 2 x 30W Continuous

smooth transition fade-in/out mute that minimizes

Average Output Power Into 8Ω 0.1% (Max)

output pops. The IC's extremely low noise floor at

• THD+N at 1kHz at Continuous Average Output

2µV and its extremely low THD+N value of 0.06% at

Power of 2 x 30W Into 8Ω 0.009% (Typ)

the rated power make the LM4766 optimum for high-

end stereo TVs or minicomponent systems.

Connection Diagram

Figure 1. Plastic Package

Top View

Non-Isolated TO-220 Package

See Package Number NDL0015A

Isolated PFM Package

See Package Number NDB0015B

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.

2Overture is a trademark of Texas Instruments.

3All other 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 (24 pages)

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LM4766 www.ti.com SNAS031F – SEPTEMBER 1998 – REVISED MARCH 2013 LM4766 Overture™ Audio Power Amplifier Series Dual 40W Audio Power Amplifier with Mute Check for Samples: LM4766 FEATURES DESCRIPTION • • The LM4766 is a stereo audio amplifier capable of delivering typically 40W per channel with the nonisolated "NDL" package and 30W per channel with the isolated "NDB" package of continuous average output power into an 8Ω load with less than 0.1% (THD+N).
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LM4766 SNAS031F – SEPTEMBER 1998 – REVISED MARCH 2013 www.ti.com Typical Application Numbers in parentheses represent pinout for amplifier B. *Optional component dependent upon specific design requirements. Figure 2.
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LM4766 www.ti.com SNAS031F – SEPTEMBER 1998 – REVISED MARCH 2013 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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LM4766 SNAS031F – SEPTEMBER 1998 – REVISED MARCH 2013 ELECTRICAL CHARACTERISTICS www.ti.com (1) (2) The following specifications apply for VCC = +30V, VEE = −30V, IMUTE = −0.5mA with RL = 8Ω unless otherwise specified. Limits apply for TA = 25°C.
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LM4766 www.ti.com SNAS031F – SEPTEMBER 1998 – REVISED MARCH 2013 Test Circuit #1 (DC Electrical Test Circuit) Figure 3. Test Circuit #2 (AC Electrical Test Circuit) Figure 4.
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LM4766 SNAS031F – SEPTEMBER 1998 – REVISED MARCH 2013 www.ti.com BRIDGED AMPLIFIER APPLICATION CIRCUIT Figure 5. Bridged Amplifier Application Circuit Single Supply Application Circuit *Optional components dependent upon specific design requirements. Figure 6.
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LM4766 www.ti.com SNAS031F – SEPTEMBER 1998 – REVISED MARCH 2013 Auxiliary Amplifier Application Circuit Figure 7. Special Audio Amplifier Application Circuit Equivalent Schematic (excluding active protection circuitry) Figure 8.
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LM4766 SNAS031F – SEPTEMBER 1998 – REVISED MARCH 2013 www.ti.com External Components Description Components RB Prevents currents from entering the amplifier's non-inverting input which may be passed through to the load upon power down of the system due to the low input impedance of the circuitry when the undervoltage circuitry is off. This phenomenon occurs when the supply voltages are below 1.5V. 2 Ri Inverting input resistance to provide AC gain in conjunction with Rf.
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LM4766 www.ti.com SNAS031F – SEPTEMBER 1998 – REVISED MARCH 2013 TYPICAL PERFORMANCE CHARACTERISTICS THD+N vs Frequency THD+N vs Frequency Figure 9. Figure 10. THD+N vs Output Power THD+N vs Output Power Figure 11. Figure 12. THD+N vs Distribution THD+N vs Distribution Figure 13. Figure 14.
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LM4766 SNAS031F – SEPTEMBER 1998 – REVISED MARCH 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) 10 Channel Separation vs Frequency Clipping Voltage vs Supply Voltage Figure 15. Figure 16. Output Power vs Load Resistance Output Power vs Supply Voltage Figure 17. Figure 18. Power Dissipation vs Output Power Power Dissipation vs Output Power Figure 19. Figure 20.
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LM4766 www.ti.com SNAS031F – SEPTEMBER 1998 – REVISED MARCH 2013 TYPICAL PERFORMANCE CHARACTERISTICS (continued) Max Heatsink Thermal Resistance (°C/W) at the Specified Ambient Temperature (°C) Note: The maximum heatsink thermal resistance values, θSA, in the table above were calculated using a θCS = 0.2°C/W due to thermal compound. Figure 21. Safe Area SPiKe Protection Response Figure 22. Figure 23. Pulse Power Limit Pulse Power Limit Figure 24. Figure 25.
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LM4766 SNAS031F – SEPTEMBER 1998 – REVISED MARCH 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) 12 Pulse Response Large Signal Response Figure 26. Figure 27. Power Supply Rejection Ratio Common-Mode Rejection Ratio Figure 28. Figure 29. Open Loop Frequency Response Supply Current vs Case Temperature Figure 30. Figure 31.
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LM4766 www.ti.com SNAS031F – SEPTEMBER 1998 – REVISED MARCH 2013 TYPICAL PERFORMANCE CHARACTERISTICS (continued) Input Bias Current vs Case Temperature Mute Attenuation vs Mute Current (per Amplifier) Figure 32. Figure 33. Mute Attenuation vs Mute Current (per Amplifier) Output Power/Channel vs Supply Voltage f = 1kHz, RL = 4Ω, 80kHz BW Figure 34. Figure 35.
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LM4766 SNAS031F – SEPTEMBER 1998 – REVISED MARCH 2013 www.ti.com APPLICATION INFORMATION MUTE MODE The muting function of the LM4766 allows the user to mute the music going into the amplifier by drawing more than 0.5mA out of each mute pin on the device. This is accomplished as shown in the Typical Application Circuit where the resistor RM is chosen with reference to your negative supply voltage and is used in conjunction with a switch.
PAGE 15
LM4766 www.ti.com SNAS031F – SEPTEMBER 1998 – REVISED MARCH 2013 Equation 2 exemplifies the theoretical maximum power dissipation point of each amplifier where VCC is the total supply voltage. PDMAX = VCC2/2π2RL (2) Thus by knowing the total supply voltage and rated output load, the maximum power dissipation point can be calculated. The package dissipation is twice the number which results from Equation 2 since there are two amplifiers in each LM4766.
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LM4766 SNAS031F – SEPTEMBER 1998 – REVISED MARCH 2013 www.ti.com BRIDGED AMPLIFIER APPLICATION The LM4766 has two operational amplifiers internally, allowing for a few different amplifier configurations. One of these configurations is referred to as “bridged mode” and involves driving the load differentially through the LM4766's outputs. This configuration is shown in Figure 5.
PAGE 17
LM4766 www.ti.com SNAS031F – SEPTEMBER 1998 – REVISED MARCH 2013 AUDIO POWER AMPLlFIER DESIGN Design a 30W/8Ω Audio Amplifier Given: Power Output 30Wrms Load Impedance 8Ω Input Level 1Vrms(max) Input Impedance 47kΩ Bandwidth 20Hz−20kHz ±0.25dB A designer must first determine the power supply requirements in terms of both voltage and current needed to obtain the specified output power. VOPEAK can be determined from Equation 5 and IOPEAK from Equation 6.
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LM4766 SNAS031F – SEPTEMBER 1998 – REVISED MARCH 2013 www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 21-May-2013 In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
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MECHANICAL DATA NDL0015A TA15A (Rev B) www.ti.
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MECHANICAL DATA NDB0015B TF15B (REV B) www.ti.
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MECHANICAL DATA NEK0015B www.ti.
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