lm48413tlx National Semiconductor Corporation, lm48413tlx Datasheet

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lm48413tlx

Manufacturer Part Number
lm48413tlx
Description
Ultra Low Emi, Filterless, 1.2w Stereo Class D Audio Power Amplifier With E2s And National 3d Enhancement
Manufacturer
National Semiconductor Corporation
Datasheet
© 2009 National Semiconductor Corporation
LM48413
Ultra Low EMI, Filterless, 1.2W Stereo Class D Audio Power
Amplifier with E
General Description
The LM48413 is a single supply, high efficiency, 1.2W/chan-
nel, filterless switching audio amplifier. The LM48413 fea-
tures National’s Enhanced Emissions Suppression (E
system - a unique patented ultra low EMI, spread spectrum,
PWM architecture. It significantly reduces RF emission while
preserving audio quality and efficiency. The E
proves battery life, reduces external component count, board
area consumption, system cost and product design cycle
time. The LM48413TL is available in a micro-SMD package,
further saving space.
The LM48413 is designed to meet the demands of mobile
phones and other portable communication devices. Operat-
ing from a single 5V supply, the device is capable of delivering
1.2W/channel of continuous output power to a 8Ω load with
less than 1% THD+N. Flexible power supply requirements al-
low operation from 2.4V to 5.5V. The wide band spread
spectrum architecture of the LM48413 reduces EMI-radiated
emissions due to the modulator frequency.
The LM48413 features high efficiency compared with con-
ventional Class AB amplifiers. The E
advanced, patent-pending edge rate control (ERC) architec-
ture that further reduce emissions by minimizing the high
frequency components of the device output, while maintain-
ing its high quality audio reproduction and high efficiency (η
= 85% at V
cludes National’s 3D audio enhancement that improves
stereo sound quality. In devices where the left and right
speakers are in close proximity, 3D enhancement affects
channel specialization, widening the perceived soundstage.
Output short circuit protection prevents the device from being
damaged during fault conditions. Superior click and pop sup-
pression eliminates audible transients on power up/down and
during shutdown. Shutdown control also provided to maxi-
mizes power savings.
EMI Plot Using 6 inch Speaker Cables
Boomer® is a registered trademark of National Semiconductor Corporation.
DD
= 3.6V, P
O
= 500mW). The LM48413 also in-
2
S and National 3D Enhancement
2
S system includes an
300635
V
2
DD
S system im-
EMI Radiation vs Frequency
= 3V, R
L
2
S)
= 15μH + 8Ω + 15μH
Key Specifications
Features
Applications
■ 
■ 
■ 
■ 
■ 
■ 
E
efficiency
Output Short Circuit Protection
Stereo Class D operation
No output filter required
National 3D Enhancement
Minimum external components
Click and Pop suppression
Micro-power shutdown
Available in space-saving approximately 2mm x 2.2mm
micro SMD package
Mobile phones
PDAs
Laptops
Quiescent Power Supply Current
at 3.6V supply
Power Output at V
R
Shutdown current
Efficiency at 3.6V, 100mW into 8Ω
Efficiency at 3.6V, 500mW into 8Ω
Efficiency at 5V, 1W into 8Ω
2
L
S system reduces EMI preserving audio quality and
= 8Ω, THD
30063536
1%
DD
= 5V,
January 9, 2009
www.national.com
0.03μA (typ)
1.2W (typ)
4mA (typ)
80% (typ)
85% (typ)
86% (typ)

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lm48413tlx Summary of contents

Page 1

... Shutdown control also provided to maxi- mizes power savings. EMI Plot Using 6 inch Speaker Cables Boomer® registered trademark of National Semiconductor Corporation. © 2009 National Semiconductor Corporation S and National 3D Enhancement Key Specifications ■ ...

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Typical Application www.national.com FIGURE 1. Typical Audio Amplifier Application Circuit 2 30063541 ...

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... Connection Diagrams Top View Order Number LM48413TL See NS Package Number TLA18CBA Ordering Information Order Number Package LM48413TL 18 Bump micro SMD LM48413TLX 18 Bump micro SMD 30063538 Package DWG # Transport Media TLA18CBA 250 units on tape and reel TLA18CBA 3000 units on tape and reel ...

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Bump Descriptions Bump Name A1 INL- A3 3DEN A5 OUTLA A7 OUTLB B2 INL+ B4 3DL- B6 GND C1 3DL+ C3 3DR PGND D2 INR+ D4 3DR INR OUTRA ...

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Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage (Note 1) Storage Temperature Input Voltage Power Dissipation (Note 3) ESD Rating (Note 4) ESD Rating (Note ...

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Note 1: “Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur, including inoperability and degradation of device reliability and/or performance. Functional operation of the device and/or non-degradation at the Absolute Maximum Ratings or other conditions beyond ...

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Typical Performance Characteristics THD+N vs Output Power/Channel = 8Ω, 22kHz 1kHz THD+N vs Frequency V = 3.6V 250mW/Ch DD OUT = 8Ω, 22kHz Efficiency vs Output Power = 8Ω, f ...

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Output Power/Channel vs Supply Voltage = 8Ω 1kHz, 22kHz Crosstalk vs Frequency V = 3.6V 500mW EMI Radiation vs Frequency = 8Ω, 3 inch cables ...

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EMI Radiation vs Frequency = 8Ω, 12 inch cables 30063534 9 www.national.com ...

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Application Information GENERAL AMPLIFIER FUNCTION The LM48413 stereo Class D audio power amplifier features a filterless modulation scheme that reduces external compo- nent count, conserving board space and reducing system cost. The outputs of the device transition from PV with ...

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The 3D RC network acts as a high-pass filter. The amount of the 3D effect is set by the R resistor. Decreasing the value 3D of R3D increases the 3D effect. The C frequency at which the 3D effect occurs. ...

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AUDIO AMPLIFIER GAIN The LM48413 has a fix gain value 24dB which is suitable for ordinary audio applications. To reduce the amplifier gain, in- sert two pairs of external input resistors with same value before the IC’s input signal pins. ...

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PCB LAYOUT GUIDELINES As output power increases, interconnect resistance (PCB traces and wires) between the amplifier, load and power sup- ply create a voltage drop. The voltage loss due to the traces between the LM48413 and the load results in ...

Page 14

Bill Of Materials TABLE 1. LM48413 Demonstration Board Bill of Materials Item Designator Description 1 U1 Stereo Class-D 2 R1, R2 Resistor (0603) Ceramic Capacitor 3 C1, C2, C3, C8 (0603) X7R Ceramic Capacitor 4 C4, C5, C6, C7 (1206) ...

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Demonstration Board Schematic FIGURE 5. LM48413 Demonstration Board Schematic 15 30063510 www.national.com ...

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Demonstration Board Layout www.national.com 30063511 Top Silkscreen 30063515 Top Layer 16 ...

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Middle Layer 1 30063514 Middle Layer 2 17 www.national.com ...

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Bottom Layer 18 ...

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Revision Table Rev Date 1.0 11/19/08 1.01 01/08/09 Description Initial release. Text edits. 19 www.national.com ...

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... Physical Dimensions X = 2.047mm ±0.030mm X 1 www.national.com inches (millimeters) unless otherwise noted MicroSMD 18 Bump Package Order Number LM48413TL, LM48413TLX NS Package Number TLA18CBA = 2.250mm ±0.030mm 0.60mm ±0.075mm 3 ...

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Notes 21 www.national.com ...

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... National Semiconductor and the National Semiconductor logo are registered trademarks of National Semiconductor Corporation. All other brand or product names may be trademarks or registered trademarks of their respective holders. ...

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