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PDF LM4950TS Data sheet ( Hoja de datos )
| Número de pieza | LM4950TS | |
| Descripción | 7.5W Mono-BTL or 3.1W Stereo Audio Power Amplifier | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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August 2004
LM4950
7.5W Mono-BTL or 3.1W Stereo Audio Power Amplifier
General Description
The LM4950 is a dual audio power amplifier primarily de-
signed for demanding applications in flat panel monitors and
TV’s. It is capable of delivering 3.1 watts per channel to a 4Ω
single-ended load with less than 1% THD+N or 7.5 watts
mono BTL to an 8Ω load, with less than 10% THD+N from a
12VDC power supply.
Boomer audio power amplifiers were designed specifically to
provide high quality output power with a minimal amount of
external components. The LM4950 does not require boot-
strap capacitors or snubber circuits. Therefore, it is ideally
suited for display applications requiring high power and mini-
mal size.
The LM4950 features a low-power consumption active-low
shutdown mode. Additionally, the LM4950 features an inter-
nal thermal shutdown protection mechanism along with short
circuit protection.
The LM4950 contains advanced pop & click circuitry that
eliminates noises which would otherwise occur during
turn-on and turn-off transitions.
The LM4950 is a unity-gain stable and can be configured by
external gain-setting resistors.
Key Specifications
j Quiscent Power Supply Current
j POUT (SE)
VDD = 12V, RL = 4Ω, 1% THD+N
j POUT (BTL)
VDD = 12V, RL = 8Ω, 10% THD+N
j Shutdown current
16mA (typ)
3.1W (typ)
7.5W (typ)
40µA (typ)
Features
n Pop & click circuitry eliminates noise during turn-on and
turn-off transitions
n Low current, active-low shutdown mode
n Low quiescent current
n Stereo 3.1W output, RL = 4Ω
n Mono 7.5W BTL output, RL = 8Ω
n Short circuit protection
n Unity-gain stable
n External gain configuration capability
Applications
n Flat Panel Monitors
n Flat panel TV’s
n Computer Sound Cards
Typical Application
20047078
FIGURE 1. Typical Bridge-Tied-Load (BTL) Audio Amplifier Application Circuit
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2004 National Semiconductor Corporation DS200470
www.national.com
1 page  
Typical Performance Characteristics
THD+N vs Frequency
THD+N vs Frequency
200470B2
VDD = 12V, RL = 8Ω,
BTL operation, POUT = 1W
THD+N vs Frequency
200470B3
VDD = 12V, RL = 8Ω,
BTL operation, POUT = 3W
THD+N vs Frequency
200470B4
VDD = 12V, RL = 8Ω,
BTL operation, POUT = 5W
THD+N vs Frequency
200470D5
VDD = 12V, RL = 8Ω,
BTL operation, BTLAV = 20, POUT = 1W
THD+N vs Frequency
200470D4
VDD = 12V, RL = 8Ω,
BTL operation, BTLAV = 20, POUT = 3W
200470D6
VDD = 12V, RL = 8Ω,
BTL operation, BTLAV = 20, POUT = 5W
5 www.national.com
5 Page 
Typical Performance Characteristics (Continued)
Output Power vs Load Resistance
Output Power vs Load Resistance
20047095
VDD = 9.6V, BTL operation, fIN = 1kHz,
at (from top to bottom at 15Ω):
THD+N = 10%, THD+N = 1%
Channel-to Channel Crosstalk vs Frequency
20047092
VDD = 9.6V, SE operation, fIN = 1kHz,
both channels driven and loaded, at (from top to bottom
at 15Ω):
THD+N = 10%, THD+N = 1%
Channel-to Channel Crosstalk vs Frequency
20047096
VDD = 9.6V, RL = 4Ω, POUT = 1W, SE operation,
at (from top to bottom at 1kHz): VINB driven, VOUTA
measured; VINA driven, VOUTB measured
THD+N vs Output Power
200470A4
VDD = 9.6V, RL = 8Ω, POUT = 1W, SE operation,
at (from top to bottom at 1kHz): VINB driven, VOUTA
measured; VINA driven, VOUTB measured
THD+N vs Output Power
200470C0
VDD = 15V, RL = 8Ω,
BTL operation, fIN = 1kHz
200470C2
VDD = 15V, RL = 4Ω,
SE operation, fIN = 1kHz
both channels driven and loaded (average shown)
11 www.national.com
11 Page | ||
| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet LM4950TS.PDF ] | |
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