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PDF LM4752TS Data sheet ( Hoja de datos )
| Número de pieza | LM4752TS | |
| Descripción | Stereo 11W Audio Power Amplifier | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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February 1999
LM4752
Stereo 11W Audio Power Amplifier
General Description
The LM4752 is a stereo audio amplifier capable of delivering
11W per channel of continuous average output power to a
4Ω load, or 7W per channel into 8Ω using a single 24V sup-
ply at 10% THD+N.
The LM4752 is specifically designed for single supply opera-
tion and a low external component count. The gain and bias
resistors are integrated on chip, resulting in a 11W stereo
amplifier in a compact 7 pin TO220 package. High output
power levels at both 20V and 24V supplies and low external
component count offer high value for compact stereo and TV
applications. A simple mute function can be implemented
with the addition of a few external components.
Key Specifications
n Output power at 10% THD+N with 1 kHz into 4Ω at V CC
= 24V 11W (typ)
n Output power at 10% THD+N with 1 kHz into 8Ω at V CC
= 24V 7W (typ)
n Closed loop gain 34 dB (typ)
n PO at 10% THD @ 1 kHz into 4Ω Single-ended TO-263
pkg. at VCC = 12V 2.5W (typ)
n PO at 10% THD @ 1 kHz into 8Ω bridged TO-263 pkg.
at VCC = 12V 5W (typ)
Features
n Drives 4Ω and 8Ω loads
n Internal gain resistors (AV = 34 dB)
n Minimum external component requirement
n Single supply operation
n Internal current limiting
n Internal thermal protection
n Compact 7 lead TO-220 package
n Low cost-per-watt
Applications
n Compact stereos
n Stereo TVs
n Mini component stereos
n Multimedia speakers
Typical Application
Connection Diagram
Plastic Package
DS100039-2
Package Description
Top View
Order Number LM4752T
Package Number TA07B
DS100039-1
FIGURE 1. Typical Audio Amplifier Application Circuit
© 1999 National Semiconductor Corporation DS100039
DS100039-50
Package Description
Top View
Order Number LM4752TS
Package Number TS07B
www.national.com
1 page  
Equivalent Schematic Diagram
5 www.national.com
5 Page 
Application Information (Continued)
FIGURE 5. Bridge-Mode Application
DS100039-30
DS100039-31
FIGURE 6. THD+N vs. POUT for Bridge-Mode Application
DS100039-37
PREVENTING OSCILLATIONS
With the integration of the feedback and bias resistors on-
chip, the LM4752 fits into a very compact package. However,
due to the close proximity of the non-inverting input pins to
the corresponding output pins, the inputs should be AC ter-
minated at all times. If the inputs are left floating, the ampli-
fier will have a positive feedback path through high imped-
ance coupling, resulting in a high frequency oscillation. In
most applications, this termination is typically provided by
the previous stage’s source impedance. If the application will
require an external signal, the inputs should be terminated to
ground with a resistance of 50 kΩ or less on the AC side of
the input coupling capacitors.
UNDERVOLTAGE SHUTDOWN
If the power supply voltage drops below the minimum oper-
ating supply voltage, the internal under-voltage detection cir-
cuitry pulls down the half-supply bias line, shutting down the
preamp section of the LM4752. Due to the wide operating
supply range of the LM4752, the threshold is set to just un-
der 9V. There may be certain applications where a higher
threshold voltage is desired. One example is a design requir-
ing a high operating supply voltage, with large supply and
bias capacitors, and there is little or no other circuitry con-
nected to the main power supply rail. In this circuit, when the
power is disconnected, the supply and bias capacitors will
discharge at a slower rate, possibly resulting in audible out-
put distortion as the decaying voltage begins to clip the out-
11 www.national.com
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| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet LM4752TS.PDF ] | |
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