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LM4734 Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LM4734
Description  3 Channel 20W Audio Power Amplifier with Mute and Standby
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM4734 Datasheet(HTML) 1 Page - National Semiconductor (TI)

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LM4734
3 Channel 20W Audio Power Amplifier with Mute and
Standby
General Description
The LM4734 is a three channel audio amplifier capable of
typically delivering 20W per channel of continuous average
output power into a 4
Ω or 8Ω load with less than 10%
THD+N from 20Hz - 20kHz.
The LM4734 has short circuit protection and a thermal shut
down feature that is activated when the die temperature
exceeds 150˚C. The LM4734 also has an under voltage lock
out feature for click and pop free power on and off.
Each amplifier of the LM4734 has an independent smooth
transition fade-in/out mute and a power conserving standby
mode. The mute and standby modes can be controlled by
external logic.
The LM4734 has a wide supply operating supply range from
±10V - ±30V allowing for lower cost unregulated power
supplies to be used.
The LM4734 can easily be configured for bridge or parallel
operation for higher power and bi-amp solutions.
Key Specifications
j Output Power/Channel with 10% THD+N,
1kHz into 4
Ω or 8Ω
20W (typ)
j THD+N at 3x1W into 8
Ω, 1kHz
0.03% (typ)
j Mute Attenuation
110dB (typ)
j PSRR
64dB (typ)
j Slew Rate
18V/µs (typ)
Features
n
Low external component count
n
Quiet fade-in/out mute mode
n
Low power standby mode
n
Wide supply range: 20V - 60V
Applications
n
Audio amplifier for component stereo
n
Audio amplifier for compact stereo
n
Audio amplifier for home theater in a box (HTB)
n
Audio amplifier for high-end and HD TVs
Typical Application
SPiKeProtection and Overtureare trademarks of National Semiconductor Corporation.
200898D2
FIGURE 1. Typical Audio Amplifier Application Circuit
February 2004
© 2004 National Semiconductor Corporation
DS200898
www.national.com


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