Datasheet LM4780, LM4780TABD (Texas Instruments)

LM4780 , LM4780TABD www.ti.com
SNAS193B – JULY 2003 – REVISED APRIL 2013
LM4780 Overture™ Audio Power Amplifier Series Stereo 60W, Mono 120W Audio Power Amplifier with Mute Check for Samples: LM4780, LM4780TABD FEATURES DESCRIPTION 1
The LM4780 is a stereo audio amplifier capable of
• SPiKe Protection 23
typically delivering 60W per channel of continuous
• Low External Component Count
average output power into an 8Ω load with less than
• Quiet Fade-In/Out Mute Mode
0.5% THD+N from 20Hz - 20kHz.
• Wide Supply Range: 20V - 84V
The LM4780 is fully protected utilizing Texas
• Signal-to-Noise Ratio ≥ 97dB (ref. to PO = 1W)
Instruments' Self Peak Instantaneous Temperature (°Ke) (SPiKeTM) protection circuitry. SPiKe provides a
APPLICATIONS
dynamically optimized Safe Operating Area (SOA). SPiKe protection completely safeguards the
• Audio Amplifier for Component Stereo
LM4780's outputs against over-voltage, under-
• Audio Amplifier for Compact Stereo
voltage, overloads, shorts to the supplies or GND, thermal runaway and instantaneous temperature
• Audio Amplifier for Self-Powered Speakers
peaks. The advanced protection features of the
• Audio Amplifier for High-End and HD TVs
LM4780 places it in a class above discrete and hybrid amplifiers.
KEY SPECIFICATIONS
Each amplifier of the LM4780 has an independent
• Output Power/Channel with 0.5% THD+N, 1kHz
smooth transition fade-in/out mute.
into 8Ω: 60 W (Typ)
The LM4780 can easily be configured for bridge or
• THD+N at 2 x 30W into 8Ω (20Hz - 20kHz):
parallel operation for 120W mono solutions.
0.03% (Typ) • THD+N at 2 x 30W into 6Ω (20Hz - 20kHz): 0.05% (Typ) • THD+N at 2 x 30W into 4Ω (20Hz - 20kHz): 0.07% (Typ) • Mute Attenuation: 110 dB (Typ) • PSRR: 85 dB (Min) • Slew Rate: 19V/µs (Typ)
1 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. Overture is a trademark of Texas Instruments. 2 All other trademarks are the property of their respective owners. 3 PRODUCTION DATA information is current as of publication date. Copyright © 2003–2013, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Document Outline Features Applications Key Specifications Description Typical Application Connection Diagram Absolute Maximum Ratings Operating Ratings Electrical Characteristics Bridged Amplifier Application Circuit Parallel Amplifier Application Circuit Single Supply Application Circuit Auxiliary Amplifier Application Circuit External Components Description Optional External Component Interaction Typical Performance Characteristics Application Information MUTE MODE UNDER-VOLTAGE PROTECTION OVER-VOLTAGE PROTECTION SPiKe PROTECTION THERMAL PROTECTION DETERMlNlNG MAXIMUM POWER DISSIPATION DETERMINING THE CORRECT HEAT SINK SUPPLY BYPASSING BRIDGED AMPLIFIER APPLICATION PARALLEL AMPLIFIER APPLICATION SINGLE-SUPPLY AMPLIFIER APPLICATION CLICKS AND POPS PROPER SELECTION OF EXTERNAL COMPONENTS HIGH PERFORMANCE CONSIDERATIONS SIGNAL-TO-NOISE RATIO LEAD INDUCTANCE PHYSICAL IC MOUNTING CONSIDERATIONS LAYOUT, GROUND LOOPS AND STABILITY REACTIVE LOADING INVERTING AMPLIFIER APPLICATION LM4780 REFERENCE BOARD ARTWORK Bill Of Materials For Reference Pcb Revision History Page 1