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LM4961 Datasheet(PDF) 10 Page - Texas Instruments

No. de pieza LM4961
Descripción Electrónicos  Ceramic Speaker Driver
Download  24 Pages
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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LM4961 Datasheet(HTML) 10 Page - Texas Instruments

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Shutdown 1
GND
12
6
GND
7
11
4
SW
VDD
L1
10 PH
FB
8
470 pF
13k
SW-Out
1
68k
Shutdown 1
Band-SW
19
Band-SW
Shutdown 2
3
Shutdown 2
4.7 PF
SW GND
28
Vamp
26
1.0 PF
GND
24
1.0 PF
Bypass
2
15
VO2
27
15
VO1
23
2 PF
Ceramic
20k
Cchg
17
VIN
18
0.1 PF
Audio
In
20k
2000 pF
200k
82 pF
BW2
BW1
21
20
VDD
42k
6800 pF
VI = VFB(1 + R2/(R3 + 170))
Load
C2
1 PF
R2
D1
CF
R3
CO1
CBYPASS
Ci
Ri
CF3
RF3
CF1
CF2
RF1
RF2
CS2
Rc
1k
C3-1
0.01 PF
RC3-1
20k
RC2-1
4.7
C2-1
4.7 PF
LM4961, LM4961LQBD
SNAS242K – AUGUST 2004 – REVISED MAY 2013
www.ti.com
Figure 20. Transient Current Spike Reduction Configuration
PROPER SELECTION OF EXTERNAL COMPONENTS
Proper selection of external components in applications using integrated power amplifiers, and switching DC-DC
converters, is critical for optimizing device and system performance. Consideration to component values must be
used to maximize overall system quality.
The best capacitors for use with the switching converter portion of the LM4961 are multi-layer ceramic
capacitors. They have the lowest ESR (equivalent series resistance) and highest resonance frequency, which
makes them optimum for high frequency switching converters.
When selecting a ceramic capacitor, only X5R and X7R dielectric types should be used. Other types such as
Z5U and Y5F have such severe loss of capacitance due to effects of temperature variation and applied voltage,
they may provide as little as 20% of rated capacitance in many typical applications. Always consult capacitor
manufacturer’s data curves before selecting a capacitor. High-quality ceramic capacitors can be obtained from
Taiyo-Yuden.
POWER SUPPLY BYPASSING
As with any amplifier, proper supply bypassing is critical for low noise performance and high power supply
rejection. The capacitor location on both V1 and VDD pins should be as close to the device as possible.
10
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Copyright © 2004–2013, Texas Instruments Incorporated
Product Folder Links: LM4961 LM4961LQBD


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