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PDF LM48511 Data sheet ( Hoja de datos )
| Número de pieza | LM48511 | |
| Descripción | Class D Audio Power Amplifier | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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1. LM48511  Hay una vista previa y un enlace de descarga de LM48511 (archivo pdf) en la parte inferior de esta página. Total 22 Páginas | ||
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September 2007
LM48511
3W, Ultra-Low EMI, Filterless, Mono, Class D Audio Power
Amplifier with Spread Spectrum
General Description
The LM48511 integrates a boost converter with a high effi-
ciency Class D audio power amplifier to provide 3W continu-
ous power into an 8Ω speaker when operating from a 5V
power supply. When operating from a 3V to 4V power supply,
the LM48511 can be configured to drive 1 to 2.5W into an
8Ω load with less than 1% distortion (THD+N). The Class D
amplifier features a low noise PWM architecture that elimi-
nates the output filter, reducing external component count,
board area consumption, system cost, and simplifying design.
A selectable spread spectrum modulation scheme suppress-
es RF emissions, further reducing the need for output filters.
The LM48511’s switching regulator is a current-mode boost
converter operating at a fixed frequency of 1MHz. Two se-
lectable feedback networks allow the LM48511 regulator to
dynamically switch between two different output voltages, im-
proving efficiency by optimizing the amplifier’s supply voltage
based on battery voltage and output power requirements.
The LM48511 is designed for use in portable devices, such
as GPS, mobile phones, and MP3 players. The high, 80%
efficiency at 5V, extends battery life when compared to Boost-
ed Class AB amplifiers. Independent regulator and amplifier
shutdown controls optimize power savings by disabling the
regulator when high output power is not required.
The gain of the LM48511 is set by external resistors, which
allows independent gain control from multiple sources by
summing the signals. Output short circuit and thermal over-
load protection prevent the device from damage during fault
conditions. Superior click and pop suppression eliminates au-
dible transients during power-up and shutdown.
Key Specifications
■ Quiescent Power Supply Current
VDD = 3V
VDD = 5V
■ PO at VDD = 5V, PV1 = 7.8V
RL = 8Ω, THD+N = 1%
■ PO at VDD = 3V, PV1 = 4.8V
RL = 8Ω, THD+N = 1%
■ Shutdown Current at VDD = 3V
9mA (typ)
13.5mA (typ)
3.0W (typ)
1W (typ)
0.01μA (typ)
Features
■ 3W Output into 8Ω at 5V with THD+N = 1%
■ Selectable spread spectrum mode reduces EMI
■ 80% Efficiency
■ Independent Regulator and Amplifier Shutdown Controls
■ Dynamically Selectable Regulator Output Voltages
■ Filterless Class D
■ 3.0V – 5.5V operation
■ Low Shutdown Currenthttp://www.DataSheet4U.net/
■ Click and Pop Suppression
Applications
■ GPS
■ Portable media
■ Cameras
■ Mobile Phones
■ Handheld games
EMI Graph
300222h5
FIGURE 1. LM48511 RF Emissions — 3 inch cable
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2007 National Semiconductor Corporation 300222
www.national.com
datasheet pdf - http://www.DataSheet4U.net/
1 page  
Absolute Maximum Ratings (Notes 2, 2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage (VDD, PV1, V1)
Storage Temperature
Input Voltage
Power Dissipation (Note 3)
ESD Susceptibility (Note 4)
ESD Susceptibility (Note 5)
Junction Temperature
9V
−65°C to +150°C
−0.3V to VDD + 0.3V
Internally limited
2000V
200V
150°C
Thermal Resistance
θJC (SQ)
θJA (SQ)
Operating Ratings
Temperature Range
TMIN ≤ TA ≤ TMAX
Supply Voltage (VDD)
Amplifier Voltage (PV1, V1)
3.8°C/W
32.8°C/W
−40°C ≤ TA ≤ +85°C
3.0V ≤ VDD ≤ 5.5V
4.8V ≤ PV1 ≤ 8.0V
Electrical Characteristics VDD = 5.0V (Notes 1, 2, 11)
The following specifications apply for VDD = 5.0V, PV1 = 7.8V (continuos mode), AV = 2V/V, R3 = 25.5kΩ, RLS = 4.87kΩ, RL =
8Ω, f = 1kHz, SS/FF = GND, unless otherwise specified. Limits apply for TA = 25°C.
LM48511
Units
Symbol
Parameter
Conditions
Typical
Limit
(Limits)
(Note 6) (Notes 7, 8)
VIN = 0, RLOAD = ∞
IDD
Quiescent Power Supply Current Fixed Frequency Mode (FF)
13.5
mA (max)
Spread Spectrum Mode (SS)
14.5 22 mA (max)
ISD Shutdown Current
VSD_BOOST = VSD_AMP = SS =
FB_SEL = GND
0.11 1 μA (max)
VIH
VIL
TWU
VOS
Logic Voltage Input High
Logic Voltage Input Low
Wake-up Time
Output Offset Voltage
CSS = 0.1μF
Note 12
RL = 8Ω
http://www.DataSheet4U.net/
f = 1kHz, BW = 22kHz
1.03 1.4 V (min)
0.92 0.4 V (min)
49 ms
0.01 3
mV
THD+N = 1%
FF
SS
3.0 2.6 W (min)
3.0 W
PO Output Power
THD+N = 10%
FF
SS
RL = 4Ω
f = 1kHz, BW = 22kHz
3.8
3.8
W
W
THD+N = 1%
FF
SS
5.4 W
5.4 W
THD+N = 10%
FF
SS
6.7 W
6.7 W
THD+N
Total Harmonic Distortion + Noise
PO = 2W, f = 1kHz, RL = 8Ω
FF
SS
PO = 3W, f = 1kHz, RL = 4Ω
FF
SS
0.03
0.03
0.04
0.05
%
%
%
%
5 www.national.com
datasheet pdf - http://www.DataSheet4U.net/
5 Page 
THD+N vs Output Power
VDD = 3V, 3.6V, 5V, RL = 8Ω
f = 1kHz, filter = 22kHz, R1 = 4.87kΩ, FF
THD+N vs Output Power
VDD = 3.6V, RL = 8Ω
filter = 22kHz, PV1 = 7.8V, PV1 = 7V, PV1 = 4.8V, FF
300222i1
Boost Amplifier vs Output Power
VDD = 5V, RL = 8Ω
f = 1kHz, PV1 = 7.8V
300222i0
Boost Amplifier vs Output Power
VDD = 3.6V, RL = 8Ω
f = 1kHz, PV1 = 7V
300222f7
Boost Amplifier vs Output Power
VDD = 3V, RL = 8Ω
f = 1kHz, PV1 = 4.8V
http://www.DataSheet4U.net/
300222f5
PSRR vs Frequency
VDD = 5V, RL = 8Ω
VRIPPLE = 200mVPP, PV1 = 7.8V
300222f6
11
300222g3
www.national.com
datasheet pdf - http://www.DataSheet4U.net/
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet LM48511.PDF ] | |
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