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PDF LM4701 Data sheet ( Hoja de datos )
| Número de pieza | LM4701 | |
| Descripción | LM4701 Overture Audio Power Amplifier Series 30W Audio Power Amplifier with Mute and Standby Modes | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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March 1998
LM4701 Overture™ Audio Power Amplifier Series
30W Audio Power Amplifier with
Mute and Standby Modes
General Description
The LM4701 is an audio power amplifier capable of deliver-
ing typically 30W of continuous average output power into an
8Ω load with less than 0.1% (THD + N).
The LM4701 has an independent smooth transition fade-in/
out mute and a power conserving standby mode which can
be controlled by external logic.
The performance of the LM4701, utilizing its Self Peak In-
stantaneous Temperature (˚Ke) (SPiKe™) Protection Cir-
cuitry, places it in a class above discrete and hybrid amplifi-
ers by providing an inherently, dynamically protected Safe
Operating Area (SOA). SPiKe Protection means that these
parts are completely safeguarded at the output against over-
voltage, undervoltage, overloads, including thermal runaway
and instantaneous temperature peaks.
Key Specifications
n THD+N at 1 kHz at continuous average output power of
25W into 8Ω:
0.1% (max)
n THD+N from 20 Hz to 20 kHz at 30W of continuous
average output power into 8Ω:
0.08% (typ)
n Standby current:
2.1 mA (typ)
Features
n SPiKe Protection
n Minimal amount of external components necessary
n Quiet fade-in/out mute function
n Power conserving standby-mode
n Non-Isolated 9-lead TO-220 package
Applications
n TVs
n Component stereo
n Compact stereo
Typical Application
Connection Diagram
Plastic Package
DS100835-1
*Optional components dependent upon specific design requirements. Refer
to the External Components Description section for a component functional
description.
FIGURE 1. Typical Audio Amplifier Application Circuit
DS100835-2
Top View
Order Number LM4701T
See NS Package Number TA9A
For Staggered Lead Non-Isolated Package
Only a 9-Pin Package
SPiKe™ Protection and Overture™ are trademarks of National Semiconductor Corporation.
© 1999 National Semiconductor Corporation DS100835
www.national.com
1 page  
Single Supply Application Circuit
FIGURE 3. Single Supply Amplifier Application Circuit
Auxillary Amplifier Application Circuit
DS100835-6
DS100835-7
FIGURE 4. Auxillary Amplifier Application Circuit
5 www.national.com
5 Page 
Typical Performance Characteristics (Continued)
Pulse Power Limit
Pulse Power Limit
Supply Current vs
Case Temperature
DS100835-40
Standby Current (ICC) vs
Standby Pin Voltage
DS100835-41
Supply Current (IEE) vs
Standby Pin Voltage
DS100835-42
Input Bias Current vs
Case Temperature
DS100835-43
Application Information
MUTE MODE
By placing a logic-high voltage on the mute pin, the signal
going into the amplifiers will be muted. If the mute pin is left
floating or connected to a logic-low level, the amplifier will be
in a non-muted state. Refer to the Typical Performance
Characteristics section for curves concerning Mute Attenu-
ation vs Mute Pin Voltage.
STANDBY MODE
The standby mode of the LM4701 allows the user to drasti-
cally reduce power consumption when the amplifier is idle.
By placing a logic-high voltage on the standby pin, the ampli-
fier will go into Standby Mode. In this mode, the current
drawn from the VCC supply is typically less than 10 µA total
for both amplifiers. The current drawn from the VEE supply is
typically 2.1 mA. Clearly, there is a significant reduction in
idle power consumption when using the standby mode. Re-
fer to the Typical Performance Characteristics section for
curves showing Supply Current vs Standby Pin Voltage for
both supplies.
UNDER-VOLTAGE PROTECTION
Upon system power-up, the under-voltage protection cir-
cuitry allows the power supplies and their corresponding ca-
pacitors to come up close to their full values before turning
on the LM4701 such that no DC output spikes occur. Upon
DS100835-44
DS100835-45
turn-off, the output of the LM4701 is brought to ground be-
fore the power supplies such that no transients occur at
power-down.
OVER-VOLTAGE PROTECTION
The LM4701 contains over-voltage protection circuitry that
limits the output current to approximately 3.5 Apk while also
providing voltage clamping, though not through internal
clamping diodes. The clamping effect is quite the same,
however, the output transistors are designed to work alter-
nately by sinking large current spikes.
SPiKe PROTECTION
The LM4701 is protected from instantaneous
peak-temperature stressing of the power transistor array.
The Safe Operating Area graph in the Typical Performance
Characteristics section shows the area of device operation
where SPiKe Protection Circuitry is not enabled. The wave-
form to the right of the SOA graph exemplifies how the dy-
namic protection will cause waveform distortion when en-
abled.
THERMAL PROTECTION
The LM4701 has a sophisticated thermal protection scheme
to prevent long-term thermal stress of the device. When the
temperature on the die reaches 165˚C, the LM4701 shuts
down. It starts operating again when the die temperature
drops to about 155˚C, but if the temperature again begins to
rise, shutdown will occur again at 165˚C. Therefore, the de-
vice is allowed to heat up to a relatively high temperature if
11 www.national.com
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| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet LM4701.PDF ] | |
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