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LM4950 bảng dữ liệu(PDF) 1 Page - National Semiconductor (TI)

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tên linh kiện LM4950
Giải thích chi tiết về linh kiện  7.5W Mono-BTL or 3.1W Stereo Audio Power Amplifier
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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 4
single-ended load with less than 1% THD+N or 7.5 watts
mono BTL to an 8
Ω load, with less than 10% THD+N from a
12V
DC 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
16mA (typ)
j POUT (SE)
V
DD = 12V, RL =4
Ω, 1% THD+N
3.1W (typ)
j POUT (BTL)
V
DD = 12V, RL =8
Ω, 10% THD+N
7.5W (typ)
j Shutdown current
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, R
L =4
n
Mono 7.5W BTL output, R
L =8
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
Boomer® is a registered trademark of National Semiconductor Corporation.
20047078
FIGURE 1. Typical Bridge-Tied-Load (BTL) Audio Amplifier Application Circuit
August 2004
© 2004 National Semiconductor Corporation
DS200470
www.national.com


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