LM48555TLBD National Semiconductor, LM48555TLBD Datasheet

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LM48555TLBD

Manufacturer Part Number
LM48555TLBD
Description
BOARD EVALUATION LM48555TL
Manufacturer
National Semiconductor
Series
Boomer®r
Datasheets

Specifications of LM48555TLBD

Amplifier Type
Class AB
Output Type
1-Channel (Mono)
Voltage - Supply
2.7 V ~ 9 V
Operating Temperature
-40°C ~ 85°C
Board Type
Fully Populated
Utilized Ic / Part
LM48555
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Max Output Power X Channels @ Load
-
© 2007 National Semiconductor Corporation
LM48555 Evaluation Board
Quick Start Guide
1) Apply power supply voltage to positive terminal of JU4, and
source ground to the negative terminal.
2) Short the terminals of JU1 to release the device from shut-
down mode.
3) Connect a ceramic speaker, and series resistance load
across the output terminals of JU3.
4) Apply a differential audio signal to the positive and negative
terminals of JU2.
Introduction
The LM48555 is an audio power amplifier designed to drive
ceramic speakers in portable applications. The LM48555
outputs15.5V
from a 3.2V power supply. The LM48555 features differential
inputs for improved noise rejection and a low power shutdown
mode.
The LM48555 includes advanced click and pop suppression
that eliminates audible turn-on and turn-off transients. Addi-
LM48555 Evaluation Board
P-P
with less than 1% THD+N while operating
300148
FIGURE 1. LM48555 Evaluation Board
National Semiconductor
Application Note 1611
Nisha Patel
April 2007
tionally, the integrated boost regulator features a soft start
function that minimizes transient current during power-up.
The LM48555 is unity-gain stable and uses external gain-set-
ting resistors.
The LM48555 Evaluation board (shown in Figure 1) allows
the user to easily evaluate the performance and characteris-
tics of the LM48555 device. It provides connectors for audio
inputs, audio outputs, power supply, and shutdown control.
The ceramic speaker load is not included on the demo board,
an external ceramic speaker plus series resistor is needed for
evaluation.
Operating Conditions
• Temperature Range
• Supply Voltage
-40°C
2.7V < V
T
DD
A
< 6.5V
+85°C
30014812
www.national.com

Related parts for LM48555TLBD

LM48555TLBD Summary of contents

Page 1

... The LM48555 includes advanced click and pop suppression that eliminates audible turn-on and turn-off transients. Addi- LM48555 Evaluation Board © 2007 National Semiconductor Corporation National Semiconductor Application Note 1611 Nisha Patel April 2007 tionally, the integrated boost regulator features a soft start function that minimizes transient current during power-up ...

Page 2

Evaluation Board Schematic www.national.com FIGURE 2. Evaluation Board Schematic 2 30014819 ...

Page 3

Connectors The LM48555 evaluation boards features connectors for the audio inputs, audio outputs, power supply, and shutdown Designator JU1 JU2 JU3 Audio Output JU4 Power Supply Bill of Materials Designator Part Description D2 Diode Schottky 20V 0.5A SOD123 L1 INDUCTOR ...

Page 4

Evaluation Board Components Part number and manufacturer information for the compo- nents on the LM48555 evaluation board can be found in the Bill of Materials (Table 2). For more information on component selection refer to the LM48555 datasheet. PCB Layout ...

Page 5

PCB Layout FIGURE 3. Silkscreen Top FIGURE 4. Top Layer 5 30014813 30014814 www.national.com ...

Page 6

FIGURE 5. Layer 2 30014816 FIGURE 6. Layer 3 6 ...

Page 7

FIGURE 7. Bottom Layer FIGURE 8. Silkscreen Bottom 7 30014817 30014818 www.national.com ...

Page 8

... National Semiconductor and the National Semiconductor logo are registered trademarks of National Semiconductor Corporation. All other brand or product names may be trademarks or registered trademarks of their respective holders. ...

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