LM4753T National Semiconductor, LM4753T Datasheet

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LM4753T

Manufacturer Part Number
LM4753T
Description
IC AMP AUDIO PWR 11.8W TO220-15
Manufacturer
National Semiconductor
Type
Class ABr
Datasheet

Specifications of LM4753T

Output Type
2-Channel (Stereo)
Max Output Power X Channels @ Load
11.8W x 2 @ 8 Ohm
Voltage - Supply
15 V ~ 28 V
Features
Mute, Short-Circuit and Thermal Protection, Standby, Volume Control
Mounting Type
Through Hole
Package / Case
TO-220-15 (Bent and Staggered Leads)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
*LM4753T

Available stocks

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Quantity
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Part Number:
LM4753T
Manufacturer:
NS
Quantity:
65
© 1999 National Semiconductor Corporation
LM4753
Dual 10W Audio Power Amplifier w/Mute, Standby and
Volume Control
General Description
The LM4753 is a stereo audio amplifier capable of delivering
10W/channel at 10% distortion into a 8
amp has an internally set gain of 30 dB. A 0V–5V DC con-
trolled volume block provides 80 dB of attenuation from input
to line-out. Line outputs are available after the volume con-
trol for signal routing.
The amplifier has a smooth transition fade-in/out mute and a
power conserving standby function which are controlled
through TTL or CMOS logic. Both functions provide over
75 dB of attenuation.
The LM4753 maintains an excellent Signal-to-Noise ratio of
greater than 70 dB with a low noise floor less than 2 mV. The
IC also maintains above 50 dB of channel separation.
The LM4753 is available in a 15-lead non-isolated plastic
package and is designed for use in TV applications requiring
single supply operation.
Typical Application
FIGURE 1. Typical Audio Amplifier Application Circuit
DS100043
load. The power
Key Specifications
n Output power into 8
n Maximum operating voltage
n Power output stage Noise floor 2 mV
n Line output Noise floor 55 µV
n 0V–5V DC controlled volume attenuation 80 dB
n Mute attenuation 75 dB
n Standby-mode supply current 7 mA
Features
n Quiet fade-in/out mute function
n Stereo variable line-out pins
n AC output short circuit protection
n Thermal shutdown protection
Applications
n Stereo TVs
n Component stereo
n Compact stereo
at 10% THD 10W
DS100043-1
28V
www.national.com
June 1999

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LM4753T Summary of contents

Page 1

... The LM4753 is available in a 15-lead non-isolated plastic package and is designed for use in TV applications requiring single supply operation. Typical Application FIGURE 1. Typical Audio Amplifier Application Circuit © 1999 National Semiconductor Corporation DS100043 Key Specifications n Output power into 8 load. The power n Maximum operating voltage n Power output stage Noise floor Line output Noise floor 55 µ ...

Page 2

Connection Diagram www.national.com Plastic Package DS100043-2 Top View Order Number See NS Package Number TA15A for Staggered Lead Non-Isolated Package 2 ...

Page 3

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage Output Current Internally Limited Power Dissipation (Note 5) ESD Susceptibility (Note 6) ESD Susceptibility (Note 7) Junction Temperature Electrical Characteristics The following specifications apply for V ...

Page 4

Electrical Characteristics The following specifications apply for V CC Symbol Parameter Standby V Standby Low Input Voltage IL V Standby High Input Voltage IH Mute V Mute Low Input Voltage IL V Mute High Input Voltage IH Note 1: DC ...

Page 5

Typical Performance Characteristics THD+N vs Frequency DS100043-8 THD+N vs Frequency DS100043-11 THD+N vs Output Power DS100043-14 THD+N vs Output Power DS100043-17 THD+N vs Frequency DS100043-9 THD+N vs Frequency DS100043-12 THD+N vs Output Power DS100043-15 THD+N vs Output Power DS100043-18 5 ...

Page 6

Typical Performance Characteristics Supply Current vs Supply Voltage DS100043-20 Channel Separation vs Frequency DS100043-23 Application Information GENERAL FEATURES The LM4753 has a number of valuable functions that make this audio amplifier IC an all-in-one solution. The IC has a stereo ...

Page 7

Application Information (Continued) abled, it overrides the mute function and places the IC in its power conserving mode. If the mute function is enabled while in standby mode, the IC will continue to remain in standby mode. After the standby ...

Page 8

Application Information If the sequence described above and shown in Figure 4 is not used, then the external circuitry shown in Figure 5 should be used to minimize turn-on/off pops and protect the output stage against SOA violations. In Figure ...

Page 9

Application Information (Continued) to ground for play mode, transistor Q1 is quickly cut off and diode D1 is forward biased. When D1 is forward biased, ca- pacitor C8 is quickly discharged to ground, bringing the standby pin voltage to 0V. ...

Page 10

Application Information FIGURE 6. Turn-On/Off External Circuitry Sequence Line Out The line out function for the LM4753 is intended to provide preamp output control for signal routing to an external power amplifier. An example of this would ...

Page 11

Application Information (Continued) In Figure kHz input signal is used to show the clipping and attenuating effect of the LM4753 when coming out of thermal shutdown. FIGURE 7. Thermal Shutdown Response THERMAL CONSIDERATIONS Determining Maximum Power ...

Page 12

Application Information performance of the tantalum will be better. There should also be large supply reservoir capacitors of about 4700 µF on each supply rail. A larger reservoir capacitor will reduce the supply ripple and will supply larger current burst ...

Page 13

... NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant ...

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