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PDF LM4880M Data sheet ( Hoja de datos )
| Número de pieza | LM4880M | |
| Descripción | Dual 250 mW Audio Power Amplifier with Shutdown Mode | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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November 1995
LM4880
Dual 250 mW Audio Power Amplifier with Shutdown
Mode
General Description
The LM4880 is a dual audio power amplifier capable of deliv-
ering typically 250 mW per channel of continuous average
power to an 8Ω load with 0.1% (THD) using a 5V power sup-
ply.
Boomer audio power amplifiers were designed specifically to
provide high quality output power with a minimal amount of
external components using surface mount packaging.
Since the LM4880 does not require bootstrap capacitors or
snubber networks, it is optimally suited for low-power por-
table systems.
The LM4880 features an externally controlled, low-power
consumption shutdown mode, as well as an internal thermal
shutdown protection mechanism.
The unity-gain stable LM4880 can be configured by external
gain-setting resistors.
Key Specifications
n THD at 1 kHz at 200 mW continuous average output
power into 8Ω: 0.1% (max)
n THD at 1 kHz at 85 mW continuous average output
power into 32Ω: 0.1% (typ)
n Output power at 10% THD + N at 1 kHz into 8Ω:
325 mW (typ)
n Shutdown Current: 0.7 µA (typ)
Features
n No bootstrap capacitors or snubber circuits are
necessary
n Small Outline (SO) and DIP packaging
n Unity-gain stable
n External gain configuration capability
Applications
n Headphone Amplifier
n Personal Computers
n CD-ROM Players
Typical Application
DS012343-1
*Refer to the Application Information section for information concerning proper selection of the input and output coupling capacitors.
FIGURE 1. Typical Audio Amplifier Application Circuit
Boomer® is a registered trademark of National Semiconductor Corporation.
© 1999 National Semiconductor Corporation DS012343
www.national.com
1 page  
External Components Description (Figure 1) (Continued)
Components
4. CS
5. CB
6. Co
Functional Description
Supply bypass capacitor which provides power supply filtering. Refer to the Application
Information section for proper placement and selection of the supply bypass capacitor.
Bypass pin capacitor which provides half-supply filtering. Refer to the section, Proper
Selection of External Components, for information concerning proper placement and
selection of CB.
Output coupling capacitor which blocks the DC voltage at the amplifier’s output. Forms a high
pass filter with RL at fo = 1/(2πRLCo).
Typical Performance Characteristics
THD + N vs Output Power
THD + N vs Output Power
THD + N vs Output Power
DS012343-5
THD + N vs Output Power
DS012343-6
THD + N vs Output Power
DS012343-7
THD + N vs Output Power
DS012343-8
THD + N vs Frequency
DS012343-9
THD + N vs Frequency
DS012343-10
THD + N vs Frequency
DS012343-11
DS012343-12
5
DS012343-13
www.national.com
5 Page 
Physical Dimensions inches (millimeters) unless otherwise noted
8-Lead (0.150" Wide) Molded Small Outline Package, JEDEC
Order Number LM4880M
NS Package Number M08A
8-Lead (0.300" Wide) Molded Dual-In-Line Package
Order Number LM4880N
NS Package Number N08E
11
www.national.com
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| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LM4880M.PDF ] | |
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