công cụ tìm kiếm bảng dữ liệu linh kiện điện tử
  Vietnamese  ▼
ALLDATASHEET.VN

X  

LM48413 bảng dữ liệu(PDF) 9 Page - Texas Instruments

tên linh kiện LM48413
Giải thích chi tiết về linh kiện  Audio Power Amplifier Series Ultra Low EMI, Filterless, 1.2W Stereo Class D Audio Power Amplifier
Download  23 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
nhà sản xuất  TI1 [Texas Instruments]
Trang chủ  http://www.ti.com
Logo TI1 - Texas Instruments

LM48413 bảng dữ liệu(HTML) 9 Page - Texas Instruments

Back Button LM48413_14 Datasheet HTML 5Page - Texas Instruments LM48413_14 Datasheet HTML 6Page - Texas Instruments LM48413_14 Datasheet HTML 7Page - Texas Instruments LM48413_14 Datasheet HTML 8Page - Texas Instruments LM48413_14 Datasheet HTML 9Page - Texas Instruments LM48413_14 Datasheet HTML 10Page - Texas Instruments LM48413_14 Datasheet HTML 11Page - Texas Instruments LM48413_14 Datasheet HTML 12Page - Texas Instruments LM48413_14 Datasheet HTML 13Page - Texas Instruments Next Button
Zoom Inzoom in Zoom Outzoom out
 9 / 23 page
background image
LM48413
www.ti.com
SNAS460A – NOVEMBER 2008 – REVISED JANUARY 2009
APPLICATION INFORMATION
GENERAL AMPLIFIER FUNCTION
The LM48413 stereo Class D audio power amplifier features a filterless modulation scheme that reduces external
component count, conserving board space and reducing system cost. The outputs of the device transition from
PVDD to GND with a 390kHz switching frequency. With no signal applied, the outputs switch with a 50% duty
cycle, in phase, causing the two outputs to cancel. This cancellation results in no net voltage across the speaker,
thus there is no current to the load in the idle state.
When an input signal is applied, the duty cycle (pulse width) of the LM48413 output's change. For increasing
output voltage, the duty cycle of one side of each output increases, while the duty cycle of the other side of each
output decreases. For decreasing output voltages, the converse occurs. The difference between the two pulse
widths yields the differential output voltage.
SHUTDOWN FUNCTION
The LM48413 features a low current shutdown mode. Set SD = GND to disable the amplifier and reduce supply
current to 0.03
μA.
Switch SD between GND and VDD for minimum current consumption in shutdown. The LM48413 may be
disabled with shutdown voltages in between GND and VDD, but the idle current will be greater than the typical
value. The LM48413 shutdown input has an internal 300k
Ω pull-down resistor. The purpose of this resistor is to
eliminate any unwanted state changes when this pin is floating. To minimize shutdown current, it should be
driven to GND or left floating. If it is not driven to GND, or floating, a small increase in shutdown supply current
will be noticed.
SPREAD SPECTRUM
The LM48413 outputs are modulated in spread spectrum scheme eliminating the need for output filters, ferrite
beads or chokes. During its operation, the switching frequency varies randomly by 30% about a 390kHz center
frequency, reducing the wideband spectral content and improving EMI emissions radiated by the speaker and
associated cables and traces. A fixed frequency class D exhibits large amounts of spectral energy at multiples of
the switching frequency. The spread spectrum architecture of the LM48413 spreads the same energy over a
larger bandwidth. The cycle-to-cycle variation of the switching period does not affect the audio reproduction,
efficiency, or PSRR.
ENHANCED EMISSIONS SUPPRESSION SYSTEM (E
2S)
The LM48413 features Texas Instruments’ patented E2S system that further reduces EMI, while maintaining high
quality audio reproduction and efficiency. The advanced edge rate control (ERC) embedded within the E2S
system works simultaneously with the spread spectrum already activated. The LM48413 ERC greatly reduces
the high frequency components of the output square waves by controlling the output rise and fall times, slowing
the transitions to reduce RF emissions, while maximizing THD+N and efficiency performance.
DIFFERENTIAL AMPLIFIER EXPLANATION
As logic supplies continue to shrink, system designers are increasingly turning to differential analog signal
handling to preserve signal to noise ratios with restricted voltage swings. The LM48413 features two fully
differential speaker amplifiers. A differential amplifier amplifies the difference between the two input signals.
Traditional audio power amplifiers have typically offered only single-ended inputs resulting in a 6dB reduction of
SNR relative to differential inputs. The LM48413 also offers the possibility of DC input coupling which eliminates
the input coupling capacitors. A major benefit of the fully differential amplifier is the improved common mode
rejection ratio (CMRR) over single-ended input amplifiers. The increased CMRR of the differential amplifier
reduces sensitivity to ground offset related noise injection, especially important in noisy systems.
POWER DISSIPATION AND EFFICIENCY
The major benefit of a Class D amplifier is increased efficiency versus a Class AB. The efficiency of the
LM48413 is attributed to the region of operation of the transistors in the output stage. The Class D output stage
acts as current steering switches, consuming negligible amounts of power compared to a Class AB amplifier.
Most of the power loss associated with the output stage is due to the IR loss of the MOSFET on-resistance,
along with switching losses due to gate charge.
Copyright © 2008–2009, Texas Instruments Incorporated
Submit Documentation Feedback
9
Product Folder Links: LM48413


Số phần tương tự - LM48413_14

nhà sản xuấttên linh kiệnbảng dữ liệuGiải thích chi tiết về linh kiện
logo
National Semiconductor ...
LM48413TL NSC-LM48413TL Datasheet
392Kb / 22P
   Ultra Low EMI, Filterless, 1.2W Stereo Class D Audio Power Amplifier with E2S and National 3D Enhancement
logo
Texas Instruments
LM48413TL/NOPB TI1-LM48413TL/NOPB Datasheet
1Mb / 25P
[Old version datasheet]   Audio Power Amplifier
logo
National Semiconductor ...
LM48413TLX NSC-LM48413TLX Datasheet
392Kb / 22P
   Ultra Low EMI, Filterless, 1.2W Stereo Class D Audio Power Amplifier with E2S and National 3D Enhancement
More results

Mô tả tương tự - LM48413_14

nhà sản xuấttên linh kiệnbảng dữ liệuGiải thích chi tiết về linh kiện
logo
Maxim Integrated Produc...
MAX9700 MAXIM-MAX9700_V01 Datasheet
2Mb / 17P
   1.2W, Low-EMI, Filterless, Class D Audio Amplifier
19-3030; Rev 3; 3/18
MAX9746 MAXIM-MAX9746 Datasheet
343Kb / 16P
   1.2W, Low-EMI, Filterless, Class D Audio Amplifier
Rev 0; 5/06
MAX9700 MAXIM-MAX9700_08 Datasheet
340Kb / 20P
   1.2W, Low-EMI, Filterless, Class D Audio Amplifier
Rev 2; 10/08
MAX9700 MAXIM-MAX9700 Datasheet
532Kb / 19P
   1.2W, Low-EMI, Filterless, Class D Audio Amplifier
Rev 1; 6/04
logo
Texas Instruments
LM48411 TI1-LM48411 Datasheet
875Kb / 22P
[Old version datasheet]   Ultra-Low EMI, Filterless, 2.5W, Stereo, Class D Audio Power Amplifier
logo
Maxim Integrated Produc...
MAX9773 MAXIM-MAX9773 Datasheet
603Kb / 21P
   1.8W, Filterless, Ultra-Low EMI, Stereo Class D Audio Power Amplifier
19-3976; Rev 0; 1/06
logo
Texas Instruments
LM48410 TI1-LM48410 Datasheet
1Mb / 24P
[Old version datasheet]   Low EMI, Filterless, 2.3W Stereo Class D Audio Power Amplifier
logo
Shenzhenshi YONGFUKANG ...
CS3816 YONGFUKANG-CS3816 Datasheet
438Kb / 9P
   2횞15W Filterless Low EMI Stereo Class D Audio Power Amplifier
logo
Maxim Integrated Produc...
MAX9715 MAXIM-MAX9715_V01 Datasheet
343Kb / 13P
   2.8W, Low-EMI, Stereo, Filterless Class D Audio Amplifier
19-3589; Rev 2; 7/08
logo
National Semiconductor ...
LM48411 NSC-LM48411 Datasheet
407Kb / 18P
   Ultra-Low EMI, Filterless, 2.5W, Stereo, Class D Audio Power Amplifier with E2S
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23


bảng dữ liệu tải về

Go To PDF Page


Link URL




Chính sách bảo mật
ALLDATASHEET.VN
Cho đến nay ALLDATASHEET có giúp ích cho doanh nghiệp của bạn hay không?  [ DONATE ] 

Alldatasheet là   |   Quảng cáo   |   Liên lạc với chúng tôi   |   Chính sách bảo mật   |   Trao đổi link   |   Tìm kiếm theo nhà sản xuất
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com