AB International SUB 1850B Specifications

Application ReportSNAA058B–July 2008–Revised May 2013AN-1850 LME49830TB Ultra-High Fidelity High PowerAmplifier Reference Design...

B =1:2è × %+1× 4+; :*V; PCB Connectionswww.ti.comIn order to obtain the lowest level distortion measurements, it is important to make an oscilloscope

www.ti.comOutput Stage BiasingThe low frequency -3dB roll-off point is 2.9Hz. Additionally, there are component footprints for additionalcapacitors in

Output Stage Biasingwww.ti.comThe LME49830 has a maximum DC bias voltage of 16V for use with just about any MOSFET device. Thehigh output drive curren

www.ti.comOutput Stage BiasingThe QVBE1thermal properties are not an exact match to the MOSFET output device thermal properties. Anadditional, tempera

Output Stage Biasingwww.ti.comFigure 8. THD+N Versus Frequency Versus Bias CurrentFigure 9. 100mA Bias Current Distortion ResidualAn under biased outp

www.ti.comOutput Stage BiasingFigure 10. 100mA Bias Current Output FFTThe under biased time domain distortion residual is represented above by an FFT

Output Stage Biasingwww.ti.comFigure 12. 250mA Bias Current Output FFTA correctly biased time domain distortion residual is represented above by an FF

www.ti.comOutput Stage BiasingFigure 14. 1A Bias Current Output FFTA class A bias level shows very low harmonics in number and amplitude. The tradeoff

Output Stage Biasingwww.ti.comIt is not possible to measure the exact instantaneous channel temperature of discrete devices. There is atemperature gra

www.ti.comCompensationFigure 17. Bias Current Change Percent Vs. Heat Sink TemperatureBased on the data above the bias resistors are set to RB1= 392Ω,

www.ti.com14 1A Bias Current Output FFT ... 1715 Bias Curren

%%1/2=+6#+.k2è × B × 81LGo Compensationwww.ti.comOne of the features of the LME49830 is the ability to set the amplifier’s slew rate and power bandwid

www.ti.comCompensationFigure 18 represents a 24V/µs slew rate from a 20pF compensation capacitor. This value is a tad shy ofthe estimated 27V/µs, howe

B22=1:2è × %%2× 4%1;=1:2è × 62L( × 6.2G3;= 414G*V Performance Graphs (±60V)www.ti.com(18)The two-pole compensation scheme allows for increased loop ga

www.ti.comBoard Layer Views8 Board Layer ViewsFigure 21. PCB Composite View From Top23SNAA058B–July 2008–Revised May 2013 AN-1850 LME49830TB Ultra-Hig

Board Layer Viewswww.ti.comFigure 22. PCB Top Silk Screen View24AN-1850 LME49830TB Ultra-High Fidelity High-Power Amplifier Reference SNAA058B–July 20

www.ti.comBoard Layer ViewsFigure 23. PCB Top Layer View25SNAA058B–July 2008–Revised May 2013 AN-1850 LME49830TB Ultra-High Fidelity High-Power Amplif

Bill of Materialswww.ti.comFigure 24. PCB Bottom Layer View9 Bill of Materials26AN-1850 LME49830TB Ultra-High Fidelity High-Power Amplifier Reference

www.ti.comBill of MaterialsReference Value Tolerance Description Manufacturer Part NumberCS1, CS2, CS3, 250V, metalizedCS4, CS10, CS11, 0.1µF 10% poly

Bill of Materialswww.ti.comReference Value Tolerance Description Manufacturer Part Number¼ Watt metal film, International YageoRT, RF1 6.81kΩ 1% MFR-2

IMPORTANT NOTICETexas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and otherch

www.ti.comIntroduction1 IntroductionThe LME49830 EF125WT1 amplifier PCB module showcases the LME ultra-high fidelity power amplifierinput stage ICs (d

Operational Detailswww.ti.comWith a 200V operating voltage range, an amplifier solution using the LME49830 is mainly limited by thenumber of output po

www.ti.comOperational DetailsTable 1. Output Power LevelsLoad 0.1% THD+N 1% THD+N 10% THD+N4Ω 335W 350W 430W8Ω 175W 185W 230WFigure 3. LME49830 EF125W

2&:#/2;I=T=:8%%;2::2è;2× 4.; :9; Operational Detailswww.ti.comsafe operating area (SOA) along with the power dissipation capabilities of the provi

www.ti.comOperational DetailsDetermining the maximum power dissipation while de-rating the output devices base on case temperaturewith the provided he

PCB Connectionswww.ti.com3.1.1 LME49830 Power DIssipationThe LME49830 die is contained in a TO-247 package with a junction-to-ambient thermal resistan

www.ti.comPCB ConnectionsAn RC output snubber network has been provided on the PCB acting as a high-frequency load. A 0.1µFcapacitor, CSN1is in series