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PDF LM4682 Data sheet ( Hoja de datos )
| Número de pieza | LM4682 | |
| Descripción | Stereo CLASS D Audio Power Amplifier | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LM4682 (archivo pdf) en la parte inferior de esta página. Total 21 Páginas | ||
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www.DataSheet4U.com
March 2006
LM4682
10 Watt Stereo CLASS D Audio Power Amplifier with
Stereo Headphone Amplifier and DC Volume Control
General Description
The LM4682 is a fully integrated single supply, high effi-
ciency audio power amplifier solution. The LM4682 utilizes a
proprietary balanced pulse-width modulation technique that
lowers output noise and THD and improves PSRR when
compared to conventional pulse width modulators.
The LM4682 also features a stereo headphone amplifier that
delivers 60mW into a 32Ω headset with less than 0.5% THD.
The LM4682’s DC volume control has a +30dB to –48dB
range when speakers are driven and a range of +13dB to
–65dB when headphones are connected. All amplifiers are
protected by thermal shutdown. Additionally, all amplifiers
incorporate output current limiting function to protect their
outputs from short circuit.
The LM4682 features a low-power consumption shutdown
mode. And its efficiency reaches 85% for a 10W output
power with an 8Ω load. External heatsink is not required
when playing music. The IC features click and pop reduction
circuitry that minimizes audible popping during device
turn-on and turn-off. The LM4682 is available in a 48-lead
LLP package, ideal for portable and desktop computer ap-
plications.
Key Specifications
n PO at THD+N = 10%, VDD = 14V
10W (typ)
n THD+N at 1kHz at 6W into 8Ω (Power Amp) 0.2% (typ)
n Efficiency at 7W into 8Ω
84% (typ)
n Total quiescent power supply current
52mA (typ)
n Total shutdown power supply current
0.1mA (typ)
n THD+N 1kHz, 20mW, 32Ω (Headphone) 0.02% (typ)
n Single supply range
8.5V to 15V
Features
n Pulse-width modulator.
n DC Volume Control
n Stereo headphone amplifier.
n “Click and pop” suppression circuitry.
n Micropower shutdown mode.
n 48 lead LLP package (No heatsink required).
Applications
n Flat Panel Displays
n Televisions
n Multimedia Monitors
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2006 National Semiconductor Corporation DS201196
www.national.com
1 page  
Absolute Maximum Ratings (Note 2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage
Input Voltage
Power Dissipation (Note 3)
ESD Susceptibility (Note 4)
ESD Susceptibility (Note 5)
Junction Temperature (Note 6)
Storage Temperature
15.5V
−0.3V to VDD +0.3V
Internally Limited
2000V
200V
150˚C
−65˚C ≤ TA ≤ 150˚C
Soldering Information
LLP Package
Vapor Phase (60 sec.)
215˚C
Infrared (15 sec.)
220˚C
See AN-450 “Surface Mounting and their Effects on
Product Reliability” for other methods of soldering surface
mount devices.
Operating Ratings (Notes 1, 2)
Temperature Range
TMIN ≤ TA ≤ TMAX
−40˚C ≤ TA ≤ +85˚C
Supply Voltage
8.5V ≤ VDD ≤ 15V
Thermal Resistance (LLP Package)
θJA 28˚C/W
θJC 20˚C/W
Electrical Characteristics (Notes 1, 2, 7)
The following specifications apply for VDD = 12V, VOLVDD = 5V, RL = 8Ω, LC filter values as shown in Figure 1, unless other-
wise specified. Limits apply for TA = 25˚C.
Symbol
Parameter
Conditions
Typical
LM4682
Max
Min
Units
VDD Operating Supply Voltage Range
12 15
Quiescent Power Supply Current,
Class D Mode
VIN = 0VRMS, VHPSEL = 0V
52 70
IS Quiescent Power Supply Current,
Headphone Mode
VIN = 0VRMS, VHPSEL = 12V 30 40
8.5 V
mA
mA
Quiescent Power Supply Current,
ISD Shutdown Mode
SDB = 0V
0.1
mA
RIN
VOLVDD
VIH
VIL
Input Resistance in Both Modes
DC Reference Supply Voltage
Minimum Logic High Input
Voltage
Maximum Logic Low Input
Voltage
SDB, MUTEB pins
8
5.5
3
0.7xVOLVDD
0.3xVOLVDD
kΩ
V
V
V
VHPIH
HP Sense High Input Voltage
VHPIL
HP Sense Low Input Voltage
Power Amplifiers
VDD/2
VDD-1
V
V
POR
PD1
EFF1
THD+N
VNOISE
Output Power, Per Channel
Power Dissipation
Efficiency
Harmonic Distortion + Noise
Output Noise Voltage, RMS.
A−Weighted
THD+N ≤ 1%, fIN = 1kHz
PO = 7W/Chan, fIN = 1kHz
PO = 7W/Chan, fIN = 1kHz
PO = 6W/Chan, fIN = 1kHz
RSOURCE = 50Ω, CIN = 1µF,
BW = 8Hz to 22kHz
A-weighted, input referred
6.0
2.6
84.4
0.2
13
5.5 W
W
%
%
µV
VRIPPLE = 200mVpp, 1kHz,
VIN = 0, input referred
f = 50Hz
94
PSRR Power Supply Rejection Ratio
f = 60Hz
94
f 100Hz
93
dB
f = 120Hz
93
f = 1kHz
84
Headphone Amplifiers
5 www.national.com
5 Page 
Typical Performance Characteristics (Power Amplifier) (Continued)
Power Supply Current vs Power Supply Voltage
20119654
Typical Performance Characteristics (Headphone Amplifier)
THD+N vs Frequency
VDD = 9V, RL = 32Ω, PO = 20mW
THD+N vs Frequency
VDD = 12V, RL = 32Ω, PO = 20mW
20119651
THD+N vs Frequency
VDD = 15V, RL = 32Ω, PO = 20mW
20119652
THD+N vs Output Power
VDD = 9V, RL = 32Ω, fIN = 1kHz
20119653
11
20119668
www.national.com
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet LM4682.PDF ] | |
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