LM4940TS/NOPB National Semiconductor, LM4940TS/NOPB Datasheet

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LM4940TS/NOPB

Manufacturer Part Number
LM4940TS/NOPB
Description
IC AMP AUDIO PWR 6W STER TO263-9
Manufacturer
National Semiconductor
Series
Boomer®r
Type
Class ABr
Datasheet

Specifications of LM4940TS/NOPB

Output Type
2-Channel (Stereo)
Max Output Power X Channels @ Load
6W x 2 @ 4 Ohm
Voltage - Supply
10 V ~ 16 V
Features
Depop, Short-Circuit and Thermal Protection, Shutdown
Mounting Type
Surface Mount
Package / Case
TO-263-9 (9 leads + tab)
For Use With
LM4940TSBD - BOARD EVALUATION LM4940TS
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
*LM4940TS
*LM4940TS/NOPB
LM4940TS
LM4940TSNOPB
LM4940TSNOPB
© 2011 National Semiconductor Corporation
6W Stereo Audio Power Amplifier
General Description
The LM4940 is a dual audio power amplifier primarily de-
signed 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
14.4V
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 boot-
strap capacitors or snubber circuits. Therefore, it is ideally
suited for display applications requiring high power and min-
imal size.
The LM4940 features a low-power consumption active-low
shutdown mode. Additionally, the LM4940 features an inter-
nal 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.
Typical Application
Boomer
®
DC
is a registered trademark of National Semiconductor Corporation.
power supply.
FIGURE 1. Typical Stereo Audio Amplifier Application Circuit
200756
LM4940
Key Specifications
Features
Applications
■ 
■ 
V
■ 
DD
Pop & click circuitry eliminates noise during turn-on and
turn-off transitions
Low current, active-low shutdown mode
Low quiescent current
Stereo 6W output, R
Short circuit protection
Unity-gain stable
External gain configuration capability
Flat Panel Monitors
Flat Panel TV's
Computer Sound Cards
Quiscent Power Supply Current
P
Shutdown current
OUT
= 14.4V, R
(SE)
L
= 4Ω, 10% THD+N
L
= 4Ω
20075672
March 28, 2011
www.national.com
40mA (max)
40µA (typ)
6W (typ)

Related parts for LM4940TS/NOPB

LM4940TS/NOPB Summary of contents

Page 1

... The LM4940 is a unity-gain stable and can be configured by external gain-setting resistors. Typical Application FIGURE 1. Typical Stereo Audio Amplifier Application Circuit Boomer ® registered trademark of National Semiconductor Corporation. © 2011 National Semiconductor Corporation LM4940 Key Specifications ■  Quiscent Power Supply Current ■ ...

Page 2

Connection Diagram www.national.com Plastic Package, TO-263 200756e7 Top View U = Wafer Fab Code Z = Assembly Plant Code XY = Date Code TT = Die Traceability Order Number LM4940TS See NS Package Number TS9A 2 ...

Page 3

... Absolute Maximum Ratings 2) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage (pin 6, referenced   to GND, pins 4 and 5) Storage Temperature Input Voltage pins 3 and 7 pins and 9 Power Dissipation (Note 3) ESD Susceptibility ...

Page 4

Typical Application FIGURE 2. Typical Stereo Audio Amplifier Application Circuit External Components Description Refer to (Figure 1.) Components This is the inverting input resistance that, along with R R and input capacitance The filter's cutoff ...

Page 5

Typical Performance Characteristics THD+N vs Frequency = 4Ω, SE operation 12V both channels driven and loaded (average shown 1W OUT V THD+N vs Frequency = 8Ω, SE operation ...

Page 6

THD+N vs Output Power = 4Ω, SE operation 12V single channel driven/single channel measured 1kHz IN THD+N vs Output Power = 16Ω, SE operation 12V single ...

Page 7

THD+N vs Output Power = 8Ω, SE operation 12V single channel driven/single channel measured 1kHz IN Output Power vs Power Supply Voltage = 4Ω, SE operation 1kHz ...

Page 8

Output Power vs Power Supply Voltage = 16Ω, SE operation both channels driven and loaded (average shown), at (from top to bottom at 12V): THD+N = 10%, THD Power Supply Rejection vs Frequency = 8Ω, ...

Page 9

Output Power vs Load Resistance V = 12V, SE operation 1kHz both channels driven and loaded, at (from top to bottom at 15Ω): THD+N = 10%, THD Channel-to-Channel Crosstalk vs Frequency = 8Ω, P ...

Page 10

Clipping Voltage vs Power Supply Voltage = 4Ω, SE operation both channels driven and loaded, at (from top to bottom at 13V): negative signal swing, positive signal swing Power Dissipation vs Ambient Temperature = 8Ω (SE), f ...

Page 11

Application Information FIGURE 3. Typical LM4940 Stereo Amplifier Application Circuit HIGH VOLTAGE BOOMER WITH INCREASED OUTPUT POWER Unlike previous 5V Boomer® amplifiers, the LM4940 is de- signed to operate over a power supply voltages range of 10V to 15V. Operating ...

Page 12

Further allowance should be made for increased ambient temperatures. The above examples assume that a device is operating around the maximum power dissipation point. Since internal power dissipation is a function of output power, ...

Page 13

C (µF) B 1.0 2.2 4 order eliminate "clicks and pops", all capacitors must be discharged before turn-on. Rapidly switching V low the capacitors to fully discharge, which may cause "clicks and pops". There is a relationship between ...

Page 14

RECOMMENDED PRINTED CIRCUIT BOARD LAYOUT Figure 4 through Figure 6 show the recommended two-layer PC board layout that is optimized for the TO263-packaged LM4940 and associated external components. This circuit board is designed for use with an external 12V supply ...

Page 15

FIGURE 6. Recommended TS PCB Layout: Bottom Layer 15 20075665 www.national.com ...

Page 16

Physical Dimensions www.national.com inches (millimeters) unless otherwise noted Plastic Package, Order Number LM4940TS NS Package Number TS9A 16 ...

Page 17

Notes 17 www.national.com ...

Page 18

... For more National Semiconductor product information and proven design tools, visit the following Web sites at: www.national.com Products Amplifiers www.national.com/amplifiers Audio www.national.com/audio Clock and Timing www.national.com/timing Data Converters www.national.com/adc Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs www.national.com/ldo LED Lighting www ...

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