Features Pop & click circuitry eliminates noise during turn-on and turn-off transitions Low current, active-low shutdown mode Low quiescent current Stereo 6W output, RL = 4Ω Short circuit protection Unity-gain stable External gain configuration capability Description The LM4940 is a dual audio power amplifier primarily designed for demanding applications in flat panel monitors and TV's. It is capable of delivering 6 watts per channel to a 4Ω load with less than 10% THD+N while operating on a 14.4VDC power supply. Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. The LM4940 does not require bootstrap capacitors or snubber circuits. Therefore, it is ideally suited for display applications requiring high power and minimal size. The LM4940 features a low-power consumption active-low shutdown mode. Additionally, the LM4940 features an internal thermal shutdown protection mechanism along with short circuit protection. The LM4940 contains advanced pop & click circuitry that eliminates noises which would otherwise occur during turn-on and turn-off transitions. The LM4940 is a unity-gain stable and can be configured by external gain-setting resistors. Key Specification ■   Quiscent Power Supply Current 40mA (max) ■   POUT (SE)   VDD = 14.4V, RL = 4Ω, 10% THD+N 6W (typ) ■   Shutdown current 40µA (typ) Applications Flat Panel Monitors Flat Panel TV's Computer Sound Cards

Typical Application click for larger image	Connection Diagram click for larger image
Typical Performance click for larger image

Parameters Values Power@ 4Ohms, 1% THD 3.1 Watt Power@ 4Ohms, 10% THD 6 Watt PSRR 56 dB Channels 2 Channels Supply Range +10 - +16 PSRR Conditions Vripple 200mV, 12V, 4ohm User Supply 10 Volt Shut down Yes Shutdown Type Low Mono/Stereo Stereo Temperature Min -40 deg C Temperature Max 85 deg C

Datasheets

Title		Size	Date	Other Language
	LM4940 6W Stereo Audio Power Amplifier	1409 Kbytes	28-Mar-11

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM4940TS/NOPB LM4940TS RoHS Status	TO-263	Full production Lead Time: 16 weeks	Distributor Region Qty ARROW Worldwide 315 DIGI-KEY Worldwide 0 MOUSER Worldwide 270 RS COMPONENTS Worldwide 55 TAYLOR Americas 315	$1.13 each at 1K+ pcs	rail of 45
LM4940TSX/NOPB LM4940TSX RoHS Status	TO-263	Full production Lead Time: 16 weeks	Distributor Region Qty DIGI-KEY Worldwide 0 MOUSER Worldwide 430	$1.13 each at 1K+ pcs	reel of 500

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM4940.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM4940 is located at RoHS Status.

Part Number(s) (NSID)	Description	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM4940TSBD	6W Stereo Audio Power Amplifier	Full production	Distributor Region Qty DIGI-KEY Worldwide 0	$100.00 each	1
The LM4940 is a dual audio power amplifier primarily designed for demanding applications in flat panel monitors and TV's. It is capable of delivering 6 watts per channel to a 4Ω load with less than 10% THD+N while operating on a 14.4VDC power supply. This LM4940TSBD is an evaluation board designed to ease the evaluation and effort during the development of a circuit using the LM4940TS. It is an easy to use stand-alone board that requires power and GND, an input signal and an output load. Features: Pop & click circuitry eliminates noise during turn-on and turn-off transitions Low current, active-low shutdown mode Low quiescent current Stereo 6W output, RL = 4Ω Short circuit protection Unity-gain stable External gain configuration capability Applications: Flat Panel Monitors Flat Panel TV's Computer Sound Cards Contents: Fully Assembled, Single Ended LM4940TS Evaluation Board Instructions for where to locate and download the datasheet Please note: application information and board layout can be found in datasheet

National Semiconductor follows the provisions of the Product Stewardship Guide for Customers (CSP-9-111C1) and Banned Substances and Materials of Interest Specification (CSP-9-111S2) for regulatory environmental compliance. Details may be found at: www.national.com/en/packaging/greennopb.html. Lead free products are RoHS compliant.

Lead Free product status is available through the search tool located here

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LM4940TS/NOPB LM4940TS	1312.226 1313.866	TO-263	9	3 3	245 235	Detail	Download	N/A	NSUZXYTTE# L4940TS
LM4940TSX/NOPB LM4940TSX	1312.226 1313.866	TO-263	9	3 3	245 235	Detail	Download	N/A	NSUZXYTTE# L4940TS

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM4940.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM4940 is located at RoHS Status.

CAD Symbols and Models Download LM4940 CAD Symbols

Models N/A