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Texas Instruments APA100 manual Supply Ripple Rejection, Measured Results

Models: APA100

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Supply Ripple Rejection

Supply Ripple Rejection

5.6 Supply Ripple Rejection

The APA100 uses a closed loop which keeps the gain from changing with supply voltage and improves the supply ripple rejection ratio (kSRR) over an open−loop class-D amplifier. The supply ripple rejection ratio versus frequency curve is shown in Figure 5−9.

Figure 5−9. APA100 Supply Ripple Rejection Ratio vs Frequency With 8- W Load

k SR − Supply Voltage Rejection Ratio − V

0

−10

−20

−30

−40

−50

−60

−70

−80

20

100 200

1 k

2 k

10 k 20 k

f − Frequency − Hz

Measured Results

5-7

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Texas Instruments APA100 manual Supply Ripple Rejection, Measured Results

Contents

User’s Guide Audio Power AmplifiersAPA100 AugustApplications IMPORTANT NOTICEProducts Read This First How to Use This ManualAbout This Manual Information About Cautions and WarningsFCC Warning Related Documentation From Texas InstrumentsData Sheets This is an example of a warning statementContents Tables FiguresChapter EVM OverviewPage Topic1.2.1Supply Voltage 1.1 Features1.2 Power Requirements EVM Overview 1.3 EVM Basic Function/Block DiagramEVM Basic Function/Block Diagram Feedback EVM Basic Function/Block DiagramIntegrator TLV2464Schematic PCB DesignChapter Page2.1.1Split Ground Plane 2.1 PCB LayoutFigure 2−2. APA100 Split Plane Bottom Layout 2.1.2H-BridgeLayout2.1.3Analog Section Layout Figure 2−3. Top Copper and Silkscreen 2.1.4PCB LayersFigure 2−5. Drill Drawing Figure 2−4. Bottom Copper and SilkscreenPCB Layout PCB DesignBill of Materials 2.2 Bill of MaterialsTable 2−1. Parts List PCB Design 2.3 SchematicSchematic Page Chapter EVM OperationPage TopicFigure 3−1. Quick Start Module Map 3.1 Quick Start3.3 Reset Button/Mute 3.2 Power−Up/Down Sequence3.4 Error Signals Table 3−1. TAS5111 Error Decoding3.5 Changing the Gain Chapter Technical InformationPage TopicFigure 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 TPA2001D1 Class-DModulator Figure 4−7. TPA2001D1 Block DiagramCh1: 3V/Div Ch2: 3V/Div Ch3: 3V/Div Ch4: 1V/Div t − Time −4.3 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 Chapter Measured ResultsPage TopicTotal Harmonic Distortion + Noise 5.1 Total Harmonic Distortion + NoiseMeasured Results Total Harmonic Distortion + NoiseOutput Power 5.2 Output PowerMeasured Results 5.3 EfficiencyEfficiency Gain and Phase Response 5.4 Gain and Phase Response5.5 Signal-to-NoiseRatio SNR Measured Results 5.6 Supply Ripple RejectionSupply Ripple Rejection