Datasheet

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LM4765

www.ti.com

SNAS030C –AUGUST 1998–REVISED APRIL 2013

LM4765 Overture™ Audio Power Amplifier Series Dual 30W Audio Power Amplifier with

Mute and Standby Modes

Check for Samples: LM4765

FEATURES

DESCRIPTION

The LM4765 is a stereo audio amplifier capable of

• SPiKe Protection

delivering typically 30W per channel of continuous

• Minimal Amount of External Components

average output power into an 8Ω load with less than

Necessary

0.1% THD+N.

• Quiet Fade-In/Out Mute Mode

Each amplifier has an independent smooth transition

• Standby-Mode

fade-in/out mute and a power conserving standby

mode which can be controlled by external logic.

• Non-Isolated 15-Lead TO-220 Package

• Wide Supply Range 20V - 66V

The performance of the LM4765, utilizing its Self

Peak Instantaneous Temperature (°Ke) (SPiKe)

KEY SPECIFICATIONS

protection circuitry, places it in a class above discrete

and hybrid amplifiers by providing an inherently,

• THD+N at 1kHz at 2 x 25W Continuous

dynamically protected Safe Operating Area (SOA).

Average Output Power into 8Ω: 0.1% (max)

SPiKe protection means that these parts are

• THD+N at 1kHz at Continuous Average Output

safeguarded at the output against overvoltage,

Power of 2 x 30W into 8Ω: 0.009% (typ)

undervoltage, overloads, including thermal runaway

and instantaneous temperature peaks.

• Standby Current: 6.5mA (typ)

APPLICATIONS

• High-End Stereo TVs

• Component Stereo

• Compact Stereo

TYPICAL APPLICATION

Numbers in parentheses represent pinout for amplifier B.

*Optional component dependent upon specific design requirements.

Figure 1. Typical Audio Amplifier Application Circuit

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 (23 pages)

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LM4765 www.ti.com SNAS030C – AUGUST 1998 – REVISED APRIL 2013 LM4765 Overture™ Audio Power Amplifier Series Dual 30W Audio Power Amplifier with Mute and Standby Modes Check for Samples: LM4765 FEATURES DESCRIPTION • • The LM4765 is a stereo audio amplifier capable of delivering typically 30W per channel of continuous average output power into an 8Ω load with less than 0.1% THD+N.
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LM4765 SNAS030C – AUGUST 1998 – REVISED APRIL 2013 www.ti.com CONNECTION DIAGRAM Figure 2. Plastic Package - Top View Non-Isolated Package See Package Number NDL0015A 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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LM4765 www.ti.com SNAS030C – AUGUST 1998 – REVISED APRIL 2013 ELECTRICAL CHARACTERISTICS (1) (2) The following specifications apply for VCC = +28V, VEE = −28V with RL = 8Ω unless otherwise specified. Limits apply for TA = 25°C. Symbol |VCC| + Parameter Conditions Power Supply Voltage (5) GND − VEE ≥ 9V LM4765 Limit (4) 18 20 V (min) 64 V (max) |VEE| PO (6) THD + N Output Power (Continuous Average) Total Harmonic Distortion Plus Noise Units (Limits) Typical (3) THD + N = 0.
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LM4765 SNAS030C – AUGUST 1998 – REVISED APRIL 2013 www.ti.com ELECTRICAL CHARACTERISTICS(1)(2) (continued) The following specifications apply for VCC = +28V, VEE = −28V with RL = 8Ω unless otherwise specified. Limits apply for TA = 25°C. Symbol Parameter Conditions LM4765 Typical (3) SNR Signal-to-Noise Ratio PO = 1W, A—Weighted, Limit (4) Units (Limits) 98 dB 108 dB Measured at 1 kHz, RS = 25Ω PO = 25W, A—Weighted Measured at 1 kHz, RS = 25Ω AM Mute Attenuation Pin 6,11 at 2.
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LM4765 www.ti.com SNAS030C – AUGUST 1998 – REVISED APRIL 2013 TEST CIRCUIT #2 AC Electrical Test; Refer to TEST CIRCUIT #2 . Figure 4. AC Electrical Test Circuit Bridged Amplifier Application Circuit Figure 5.
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LM4765 SNAS030C – AUGUST 1998 – REVISED APRIL 2013 www.ti.com Single Supply Application Circuit Note: *Optional components dependent upon specific design requirements. Figure 6. Single Supply Amplifier Application Circuit Auxiliary Amplifier Application Circuit Figure 7.
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LM4765 www.ti.com SNAS030C – AUGUST 1998 – REVISED APRIL 2013 Equivalent Schematic (excluding active protection circuitry) Figure 8.
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LM4765 SNAS030C – AUGUST 1998 – REVISED APRIL 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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LM4765 www.ti.com SNAS030C – AUGUST 1998 – REVISED APRIL 2013 TYPICAL PERFORMANCE CHARACTERISTICS THD + N vs Frequency THD + N vs Frequency Figure 9. Figure 10. THD + N vs Frequency THD + N vs Output Power Figure 11. Figure 12. THD + N vs Output Power THD + N vs Output Power Figure 13. Figure 14.
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LM4765 SNAS030C – AUGUST 1998 – REVISED APRIL 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) 10 Clipping Voltage vs Supply Voltage Clipping Voltage vs Supply Voltage Figure 15. Figure 16. Clipping Voltage vs Supply Voltage Output Power vs Load Resistance Figure 17. Figure 18. Power Dissipation vs Output Power Power Dissipation vs Output Power Figure 19. Figure 20.
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LM4765 www.ti.com SNAS030C – AUGUST 1998 – REVISED APRIL 2013 TYPICAL PERFORMANCE CHARACTERISTICS (continued) Output Power vs Supply Voltage Output Mute vs Mute Pin Voltage Figure 21. Figure 22. Output Mute vs Mute Pin Voltage Channel Separation vs Frequency Figure 23. Figure 24. Pulse Response Large Signal Response Figure 25. Figure 26.
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LM4765 SNAS030C – AUGUST 1998 – REVISED APRIL 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) 12 Power Supply Rejection Ratio Common-Mode Rejection Ratio Figure 27. Figure 28. Open Loop Frequency Response Safe Area Figure 29. Figure 30. SPiKe Protection Response Supply Current vs Supply Voltage Figure 31. Figure 32.
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LM4765 www.ti.com SNAS030C – AUGUST 1998 – REVISED APRIL 2013 TYPICAL PERFORMANCE CHARACTERISTICS (continued) Pulse Thermal Resistance Pulse Thermal Resistance Figure 33. Figure 34. Supply Current vs Output Voltage Pulse Power Limit Figure 35. Figure 36. Pulse Power Limit Supply Current vs Case Temperature Figure 37. Figure 38.
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LM4765 SNAS030C – AUGUST 1998 – REVISED APRIL 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) Supply Current (ICC) vs Standby Pin Voltage Supply Current (IEE) vs Standby Pin Voltage Figure 39. Figure 40. Input Bias Current vs Case Temperature Figure 41.
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LM4765 www.ti.com SNAS030C – AUGUST 1998 – REVISED APRIL 2013 APPLICATION INFORMATION MUTE MODE By placing a logic-high voltage on the mute pins, the signal going into the amplifiers will be muted. If the mute pins are left floating or connected to a logic-low voltage, the amplifiers will be in a non-muted state. There are two mute pins, one for each amplifier, so that one channel can be muted without muting the other if the application requires such a configuration.
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LM4765 SNAS030C – AUGUST 1998 – REVISED APRIL 2013 www.ti.com DETERMlNlNG MAXIMUM POWER DISSIPATION Power dissipation within the integrated circuit package is a very important parameter requiring a thorough understanding if optimum power output is to be obtained. An incorrect maximum power dissipation calculation may result in inadequate heat sinking causing thermal shutdown and thus limiting the output power.
PAGE 17
LM4765 www.ti.com SNAS030C – AUGUST 1998 – REVISED APRIL 2013 BRIDGED AMPLIFIER APPLICATION The LM4765 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 LM4765's outputs. This configuration is shown in Figure 5.
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LM4765 SNAS030C – AUGUST 1998 – REVISED APRIL 2013 www.ti.com CLICKS AND POPS In the typical application of the LM4765 as a split-supply audio power amplifier, the IC exhibits excellent “click” and “pop” performance when utilizing the mute and standby modes. In addition, the device employs UnderVoltage Protection, which eliminates unwanted power-up and power-down transients. The basis for these functions are a stable and constant half-supply potential.
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LM4765 www.ti.com SNAS030C – AUGUST 1998 – REVISED APRIL 2013 Thus with Ri = 1 kΩ a non-inverting gain of 21 will result. Since the desired input impedance was 47 kΩ, a value of 47 kΩ was selected for RIN. The final design step is to address the bandwidth requirements which must be stated as a pair of −3 dB frequency points. Five times away from a −3 dB point is 0.17 dB down from passband response which is better than the required ±0.25 dB specified.
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LM4765 SNAS030C – AUGUST 1998 – REVISED APRIL 2013 www.ti.com REVISION HISTORY Changes from Revision B (April 2013) to Revision C • 20 Page Changed layout of National Data Sheet to TI format ..........................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.com 11-Apr-2013 PACKAGING INFORMATION Orderable Device Status (1) LM4765T/NOPB ACTIVE Package Type Package Pins Package Drawing Qty TO-220 NDL 15 20 Eco Plan Lead/Ball Finish (2) Green (RoHS & no Sb/Br) MSL Peak Temp Op Temp (°C) Top-Side Markings (3) CU SN Level-1-NA-UNLIM (4) -20 to 85 LM4765T (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs.
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MECHANICAL DATA NDL0015A TA15A (Rev B) www.ti.
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