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Texas Instruments APA100 manual Technical Information, Chapter, Page, Topic

Models: APA100

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Technical Information

Chapter 4

Technical Information

This chapter goes into the details of the design of the 100-W amplifier. The design comprises the modulator, H-bridge, operational amplifier, feedback loop, LC filter, and thermal.

Topic		Page

4.1	Feedback System Design	. . 4-2
4.2	TPA2001D1 (Class-D Modulator)	. . 4-7
4.3	TAS5111 (H-Bridge)	. . 4-9
4.4	TLV2464A (Gain Setting and Feedback)	. . 4-9
4.5	LC Filter	. 4-10
4.6	Thermal	. 4-11

4-1

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Texas Instruments APA100 manual Technical Information, Chapter, Page, Topic

Contents

August Audio Power AmplifiersUser’s Guide APA100Applications IMPORTANT NOTICEProducts 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 Page1.2.1Supply Voltage 1.1 Features1.2 Power Requirements EVM Overview 1.3 EVM Basic Function/Block DiagramEVM Basic Function/Block Diagram TLV2464 EVM Basic Function/Block DiagramFeedback IntegratorPage PCB DesignSchematic Chapter2.1.1Split 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 LayersPCB Design Figure 2−4. Bottom Copper and SilkscreenFigure 2−5. Drill Drawing PCB LayoutBill of Materials 2.2 Bill of MaterialsTable 2−1. Parts List PCB Design 2.3 SchematicSchematic 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 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