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Texas Instruments APA100 manual Total Harmonic Distortion + Noise

Models: APA100

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Total Harmonic Distortion + Noise

Total Harmonic Distortion + Noise

5.1 Total Harmonic Distortion + Noise

The APA100 has excellent total harmonic distortion + noise (THD+N). Figure 5−1 and Figure 5−2 show the THD+N versus frequency, and Figure 5−3 and Figure 5−4 show THD+N vs output power. A 30-kHz bandwidth limit was used on the audio precision to limit switching frequency from affecting the measurement.

Figure 5−1. APA100 THD+N vs Frequency With 4- W Load

THD+N − Total Harmonic Distortion + Noise − %

100

10

1

0.1

0.01

20

VCC = 29.5 V

PO = 70 W

PO = 40 W

PO = 10 W

PO = 1 W

100 200	1 k 2 k	20 k
f − Frequency − Hz

Figure 5−2. APA100 THD+N vs Frequency With 8- W Load

THD+N − Total Harmonic Distortion + Noise − %

100

10

1

0.1

0.01

20

VCC = 29.5 V

PO = 40 W

PO = 20 W
PO = 20 W		PO = 10 W
		PO = 10 W

			PO = 1 W

100 200	1 k 2 k	20 k
f − Frequency − Hz

5-2

Image 36

Texas Instruments APA100 manual Total Harmonic Distortion + Noise

Contents

Audio Power Amplifiers User’s GuideAPA100 AugustIMPORTANT NOTICE ProductsApplications How to Use This Manual Read This FirstAbout This Manual Information About Cautions and WarningsRelated Documentation From Texas Instruments FCC WarningData Sheets This is an example of a warning statementContents Figures TablesEVM Overview ChapterPage Topic1.1 Features 1.2 Power Requirements1.2.1Supply Voltage 1.3 EVM Basic Function/Block Diagram EVM Basic Function/Block DiagramEVM Overview EVM Basic Function/Block Diagram FeedbackIntegrator TLV2464PCB Design SchematicChapter Page2.1 PCB Layout 2.1.1Split Ground Plane2.1.2H-BridgeLayout 2.1.3Analog Section LayoutFigure 2−2. APA100 Split Plane Bottom Layout 2.1.4PCB Layers Figure 2−3. Top Copper and SilkscreenFigure 2−4. Bottom Copper and Silkscreen Figure 2−5. Drill DrawingPCB Layout PCB Design2.2 Bill of Materials Table 2−1. Parts ListBill of Materials 2.3 Schematic SchematicPCB Design Page EVM Operation ChapterPage Topic3.1 Quick Start Figure 3−1. Quick Start Module Map3.2 Power−Up/Down Sequence 3.3 Reset Button/Mute3.4 Error Signals Table 3−1. TAS5111 Error Decoding3.5 Changing the Gain Technical Information ChapterPage Topic4.1 Feedback System Design Figure 4−1. APA100 Block DiagramPhase Margin + 180 Phase at Fc Figure 4−4. APA100 Integrator Design Closed−loop gain + 1.5 0 C10 V1 1 0 4.2 TPA2001D1 Class-DModulator Figure 4−7. TPA2001D1 Block Diagram TPA2001D1 Class-DModulatorCh1: 3V/Div Ch2: 3V/Div Ch3: 3V/Div Ch4: 1V/Div t − Time −4.4 TLV2464A Gain Setting and Feedback 4.3 TAS5111 H-Bridge4.5 LC Filter Figure 4−9. APA100 Output Filter4.6 Thermal Table 4−1. TAS5111 Thermal TableAs an indication of the importance of keeping the thermal grease layer thin, if the thermal grease layer increases to 0.002 inch thick, the required heatsink thermal resistance changes to 2.4C/W Measured Results ChapterPage Topic5.1 Total Harmonic Distortion + Noise Total Harmonic Distortion + NoiseTotal Harmonic Distortion + Noise Measured Results5.2 Output Power Output Power5.3 Efficiency EfficiencyMeasured Results 5.4 Gain and Phase Response 5.5 Signal-to-NoiseRatio SNRGain and Phase Response 5.6 Supply Ripple Rejection Supply Ripple RejectionMeasured Results