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TPA032D02 ClassĆD Stereo

Audio Power Amplifier

Evaluation Module

September 2000

Mixed-Signal Products

User’s Guide

SLOU066A

Summary of Contents for TPA032D02

Page 1: ...TPA032D02 Class D Stereo Audio Power Amplifier Evaluation Module September 2000 Mixed Signal Products User s Guide SLOU066A...

Page 2: ...this warranty Specific testing of all parameters of each device is not necessarily performed except those mandated by government requirements Customers are responsible for their applications using TI...

Page 3: ...amplifier ICs J Reducing and Eliminating the Class D Output Filter TI Literature Number SLOA023 This application report covers output filter theory and design for class D audio power amplifiers FCC Wa...

Page 4: ...iv...

Page 5: ...nd Indicator Circuits 3 8 3 2 6 TPA032D02 Class D EVM Test Points 3 9 3 3 Class D Amplifier Design Considerations 3 10 3 4 Using the TPA032D02 Class D EVM With the Plug N Play Platform 3 11 3 4 1 Inst...

Page 6: ...tortion versus Output Power at 8 3 21 3 14 Class D Amplifier Distortion versus Frequency at 1 W Into 4 3 22 3 15 Class D Amplifier Distortion versus Frequency at 1 W Into 8 3 22 3 16 Class D Amplifier...

Page 7: ...D stereo audio power amplifier evaluation module SLOP245 It includes a list of EVM features a brief description of the module illustrated with a pictorial diagram and a list of EVM specifications Topi...

Page 8: ...With the TI Plug N Play Audio Amplifier Evaluation Platform J Evaluation module is designed to simply plug into the platform automatically making all signal control and power connections J Platform pr...

Page 9: ...D Stereo Audio Power Amplifier EVM Top View U1 RIN R6 C5 Rout R2 R1 SD Mute Rout Lout Lout GND VDD GND VCC R3 GND LIN GND S1 Mute S2 SD C1 C4 C2 C3 C19 L3 L4 L1 L2 C14 TP2 TP1 TP4 C13 Rev B VCC R4 TP3...

Page 10: ...y and connects them to a versatile array of standard audio input and output jacks and connectors Easy to use configuration controls allow the platform and EVMs to quickly model many possible end equip...

Page 11: ...ipment The platform switch and jumper settings shown in Table 2 1 are typical for the TPA032D02 class D EVM There are no jumpers or switches to set on the TPA032D02 class D EVM board itself Table 2 1...

Page 12: ...r both may result Figure 2 1 Quick Start Platform Map Signal Conditioning CAUTION Do not insert or remove EVM boards with power applied ICC JP4 F1 VR1 R1 JP3 JP2 JP1 AC DC J2 VCC J1 D1 D2 D3 D4 J2 J3...

Page 13: ...stall a voltage regulator EVM SLVP097 in platform socket U6 for VDD power to EVM control inputs 3 Set to ON Tone Control Board SLOP109 is installed in U1 Power supply 7 Connect a 12 V regulated power...

Page 14: ...ss D operation taking care to observe marked polarity For single ended input the negative input pins RIN and LIN should be connected to the ground of the audio signal source 6 Connect a control signal...

Page 15: ...ions 3 2 3 2 The TPA032D02 Class D Audio Power Amplifier EVM 3 3 3 3 Class D Amplifier Design Considerations 3 10 3 4 Using the TPA032D02 Class D EVM With the P N P Platform 3 11 3 5 Using the TPA032D...

Page 16: ...or both may result Figure 3 1 The TI Plug N Play Audio Amplifier Evaluation Platform Signal Conditioning CAUTION Do not insert or remove EVM boards with power applied ICC JP4 F1 VR1 R1 JP3 JP2 JP1 AC...

Page 17: ...tion module includes onboard pushbutton switches for manual muting and shutdown and input pins for logic control of mute and shutdown The module can be used with the TI plug n play audio amplifier eva...

Page 18: ...L1 L2 C14 TP2 TP1 TP4 C13 Rev B VCC R4 TP3 R5 TPA032D02 EVM Board SLOP245 Texas 2000 Instruments Note Capacitors C13 and C14 are optional not assembled and locations for them on the EVM PCB have been...

Page 19: ...apacitors C13 and C14 are optional not assembled and locations for them on the EVM PCB have been provided to increase design flexibility and allow decoupling capacitance to be added Section 3 7 Power...

Page 20: ...IN is applied to a very fast comparator along with a ramp signal VRAMP created by the ramp generator Each time the triangle wave from the ramp generator crosses the audio input signal level the compar...

Page 21: ...tes 180 out of phase from the other The load in this case a speaker is then connected between the two halves and is not connected directly to ground The load is in a sense floating BTL operation has t...

Page 22: ...t or thermal fault exists Module pins are provided for easy connection of off board control and monitoring There are two active low fault indicator pins on the TPA032D02 amplifier IC IC pins 40 and 41...

Page 23: ...r analysis of device performance and design adjustments Table 3 2 lists each test point and its corresponding function Table 3 2 TPA032D02 Class D EVM Test Points TEST POINT IC PIN or EVM FUNCTION FUN...

Page 24: ...ww ti com sc apa This document provides background information general equations and component selection criteria for the topics listed below General layout considerations are also included in the rep...

Page 25: ...only with the proper orientation Evaluation modules are easily removed from the platform by simply prying them up and lifting them out of their sockets Care must be taken however to prevent bending t...

Page 26: ...he SD module pin The shutdown mode reduces the amplifier IC current consumption to less than 1 A compared to approximately 2 5 mA in the mute mode The EVM shutdown current is based on VCC VDD R2 R5 an...

Page 27: ...led there or socket U1 can be bypassed and the audio input signal applied directly to the inputs of the TPA032D02 class D EVM Platform switch S2 selects signal conditioning or bypasses it 3 4 3 2 Head...

Page 28: ...When JP6 is set to mute and JP8 is set to Lo the class D EVM will operate normally until a headphone plug is inserted into platform jack J10 and the class D amplifier is placed into shutdown Once the...

Page 29: ...eadphone amplifier is NOT installed in U5 J Set jumper JP6 to MUTE when a separate headphone amplifier IS installed in U5 This will cause the TPA032D02 class D EVM to shut down when a plug is inserted...

Page 30: ...supply during continuous full power output peak current draw can be as high as 2 3 A per channel Any power supply connected to the platform should be capable of providing 4 6 A peak to avoid clipping...

Page 31: ...output signals leave the platform through left and right RCA phono jacks J7 and J9 left and right pairs of compression connectors for stripped speaker wires J8 and optionally through a miniature 1 8 s...

Page 32: ...nputs Right Audio Inputs Left LED 0 R Shutdown Mute R 5 V LED 1 Fault Monitor U1 RIN R6 C5 Rout R2 R1 SD Mute Rout Lout Lout GND VDD GND VCC R3 GND LIN GND S1 Mute S2 SD C1 C4 C2 C3 C19 L3 L4 L1 L2 C1...

Page 33: ...se pickup if the lead lengths are long and the cable is not shielded 3 5 3 Output Connections The right speaker should be connected between the Rout and the Rout module pins and the left speaker shoul...

Page 34: ...dB f Frequency Hz VOLTAGE AMPLIFICATION vs FREQUENCY 10k 100k 5 0 VDD 12 V RL 4 TA 25 C 25 30 Total harmonic distortion plus noise THD N versus output power and frequency is shown in Figures 3 12 thr...

Page 35: ...S NOISE vs OUTPUT POWER PO Output Power W 0 01 0 1 1 10 1 THD N Total Harmonic Distortion Plus Noise 0 1 0 02 VDD 12 V RL 4 TA 25 C Figure 3 13 Class D Amplifier Distortion versus Output Power at 8 PO...

Page 36: ...e PWM output Figure 3 14 Class D Amplifier Distortion versus Frequency at 1 W Into 4 20 100 1k f Frequency Hz TOTAL HARMONIC DISTORTION PLUS NOISE vs FREQUENCY 10k 20k 1 THD N Total Harmonic Distortio...

Page 37: ...ayout grounding and power supply decoupling Figure 3 16 Class D Amplifier Crosstalk versus Frequency Into 4 20 100 1k Crosstalk dB f Frequency Hz CROSSTALK vs FREQUENCY 10k 20k VDD 12 V RL 4 TA 25 C 2...

Page 38: ...trolytic capacitor rated at 25 V 90 m and for 755 mA at 100 kHz In the bottom trace the 330 F capacitor was replaced by a 390 F aluminum electrolytic capacitor rated at 35 V 65 m and for 1 2 A of 100...

Page 39: ...output to J7 or J8 34 35 Rout Class D right channel inverted output Right Out Right channel negative output to J7 or J8 5 LIN Class D left channel positive input Left In line Left channel input from...

Page 40: ...V X7R 1206 4 Kemet C1206C224K5RAC C24 C25 Capacitor Ceramic Chip 1 F 10 50 V X7R 1812 2 Kemet C1812C105K5RAC L1 L2 L3 L4 Inductor SMT 15 H 20 2 2 ADC 47 2 m 1 kHz 20 to 90 C 0 398 0 398 0 236 4 TDK SL...

Page 41: ...UTP 39 RPVDD 40 FAULT_1 41 FAULT_0 42 RCOMP 43 RINP 44 RINN 45 NC 30 V2P5 29 PVDD 28 PGND 27 NC 26 CP2 25 AGND 46 47 COSC 48 AGND C19 C8 C2 C6 LIN LIN L3 L1 C21 C20 C24 C13 C9 C10 LOUT LOUT VCC C4 C7...

Page 42: ...yers The following illustrations depict the TPA032D02 class D EVM PCB assembly and layers These drawings are not to scale Gerber plots can be obtained from any TI Sales Office Figure 3 20 TPA032D02 Cl...

Page 43: ...TPA032D02 Class D EVM PCB Layers 3 29 Details Figure 3 22 TPA032D02 Class D EVM Top Layer Figure 3 23 TPA032D02 Class D EVM Second Layer...

Page 44: ...TPA032D02 Class D EVM PCB Layers 3 30 Details Figure 3 24 TPA032D02 Class D EVM Third Layer Figure 3 25 TPA032D02 Class D EVM Bottom Layer...

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