AN-1192| Application Note

Overture Series High Power Solutions

OvertureTM Series High Power Solutions

National Semiconductor Application Note 1192 John DeCelles and Troy Huebner June 2004

Table of Contents
1.0 Introduction ............................................................................................................................................. 2 2.0 Objective ................................................................................................................................................. 2 3.0 Conclusion .............................................................................................................................................. 2 4.0 Thermal Background .............................................................................................................................. 2 4.1 TYPICAL CHARACTERISTIC DATA ................................................................................................... 3 4.2 SINGLE-ENDED AMPLIFIER Pdmax EQUATION: ............................................................................. 3 4.3 BRIDGED-OUTPUT AMPLIFIER Pdmax EQUATION ......................................................................... 3 4.4 PARALLE
L AMPLIFIER Pdmax EQUATION ....................................................................................... 4 4.5 BRIDGED/PARALLEL AMPLIFIER Pdmax EQUATION ...................................................................... 4 4.6 THERMAL CONCLUSION ................................................................................................................... 4 4.7 THERMAL TESTING CONDITIONS .................................................................................................... 5 5.0 BR100 -- 100W Bridge Circuit ................................................................................................................ 5 5.1 AUDIO TESTING ................................................................................................................................. 5 5.1.1 Linearity Tests ................................................................................................................................ 5 5.2 SCHEMATICS ..............................................
........................................................................................ 6 5.2.1 Bridged Amplifier Schematic .......................................................................................................... 6 5.2.2 Electrical Design Notes .................................................................................................................. 6 6.0 PA100 -- 100W Parallel Circuit ............................................................................................................... 7 6.1 AUDIO TESTING ................................................................................................................................. 7 6.1.1 Linearity Test .................................................................................................................................. 7 6.2 SCHEMATICS ...................................................................................................................................... 8 6.2.1 Parallel Amplifier Schematic ..
......................................................................................................... 8 6.2.2 Electrical Design Notes .................................................................................................................. 8 7.0 BPA200 200W Bridged/Parallel Circuit ................................................................................................. 9 7.1 AUDIO TESTING ................................................................................................................................. 9 7.1.1 Linearity Tests ................................................................................................................................ 9 7.1.2 Output Power Tests ........................................................................................................................ 9 7.1.3 Noise Floor Tests ......................................................................................................................... 10 7.1.4 Electrical Design Not
es ................................................................................................................ 11 7.2 SCHEMATICS .................................................................................................................................... 12 7.2.1 Detailed Bridged/Parallel Amplifier Schematic ............................................................................. 12 7.2.2 Servo Circuits ............................................................................................................................... 13 7.2.3 Power Supply Circuit .................................................................................................................... 14 7.2.4 Basic Bridged/Parallel Amplifier Schematic ................................................................................. 15 8.0 Parts List and Vendors ......................................................................................................................... 16 8.1 BUILD OF MATERIALS FOR BR100 AM
PLIFIER ............................................................................ 16 8.2 BUILD OF MATERIALS FOR PA100 AMPLIFIER ............................................................................. 16 8.3 BUILD OF MATERIALS FOR BPA200 AMPLIFIER .......................................................................... 18 9.0 Heat Sink Drawings .............................................................................................................................. 19 9.1 BR100 AND PA100 HEAT SINK DRAWING ..................................................................................... 19 9.2 BPA200 HEAT SINK DRAWING ........................................................................................................ 20

AN-1192

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2004 National Semiconductor Corporation

AN200151

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