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Texas Instruments APA100 manual Efficiency, Measured Results

Models: APA100

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Efficiency

Efficiency

5.3 Efficiency

The APA100 is a highly efficient class-D audio power amplifier. The efficiency is greater than 85% efficient with 4- or 8-Ωload. The efficiency plot is shown in Figure 5−7.

Figure 5−7. APA100 Efficiency vs Output Power With 4- W Load

h − System Output Stage Efficiency − %

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20															f = 1 kHz,
															f = 1 kHz,
10															RL = 4 W,
10															RL = 4 W,
															TC = 755C
0
0		10		20		30		40		50		60			70		80
0		10		20		30		40		50		60			70		80

PO − Output Power − W

Measured Results

5-5

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Texas Instruments APA100 manual Efficiency, Measured Results

Contents

August Audio Power AmplifiersUser’s Guide APA100IMPORTANT NOTICE ProductsApplications Information About Cautions and Warnings How to Use This ManualRead This First About This ManualThis is an example of a warning statement Related Documentation From Texas InstrumentsFCC Warning Data SheetsContents Tables FiguresTopic EVM OverviewChapter Page1.1 Features 1.2 Power Requirements1.2.1Supply Voltage 1.3 EVM Basic Function/Block Diagram EVM Basic Function/Block DiagramEVM Overview TLV2464 EVM Basic Function/Block DiagramFeedback IntegratorPage PCB DesignSchematic Chapter2.1.1Split Ground Plane 2.1 PCB Layout2.1.2H-BridgeLayout 2.1.3Analog Section LayoutFigure 2−2. APA100 Split Plane Bottom Layout Figure 2−3. Top Copper and Silkscreen 2.1.4PCB LayersPCB Design Figure 2−4. Bottom Copper and SilkscreenFigure 2−5. Drill Drawing PCB Layout2.2 Bill of Materials Table 2−1. Parts ListBill of Materials 2.3 Schematic SchematicPCB Design Page Topic EVM OperationChapter PageFigure 3−1. Quick Start Module Map 3.1 Quick StartTable 3−1. TAS5111 Error Decoding 3.2 Power−Up/Down Sequence3.3 Reset Button/Mute 3.4 Error Signals3.5 Changing the Gain Topic Technical InformationChapter PageFigure 4−1. APA100 Block Diagram 4.1 Feedback System DesignPhase 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 t − Time − Figure 4−7. TPA2001D1 Block DiagramTPA2001D1 Class-DModulator Ch1: 3V/Div Ch2: 3V/Div Ch3: 3V/Div Ch4: 1V/Div4.3 TAS5111 H-Bridge 4.4 TLV2464A Gain Setting and FeedbackFigure 4−9. APA100 Output Filter 4.5 LC FilterTable 4−1. TAS5111 Thermal Table 4.6 ThermalAs 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 Topic Measured ResultsChapter PageTotal Harmonic Distortion + Noise 5.1 Total Harmonic Distortion + NoiseMeasured Results Total Harmonic Distortion + NoiseOutput Power 5.2 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