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TPA005D02 Class D EVM PCB Layers

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Figure 3–30. TPA005D02 Class D EVM Bottom Layer

Summary of Contents for TPA005D02

Page 1: ...TPA005D02 Class D Stereo Audio Power Amplifier Evaluation Module October 1998 Mixed Signal Products User s Guide SLOU032A...

Page 2: ...ONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF DEATH PERSONAL INJURY OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE CRITICAL APPLICATIONS TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED AUTHORIZED OR WARRANT...

Page 3: ...This equipment is intended for use in a laboratory test environment only It generates uses and can radiate radio frequency energy and has not been tested for compliance with the limits of computing d...

Page 4: ...iv...

Page 5: ...verview of Class D Audio Amplifiers 3 5 3 2 3 EVM Design Considerations 3 7 3 2 4 Efficiency of Class D vs Linear Operation 3 15 3 3 Using The TPA005D02 Class D EVM With the Plug N Play Platform 3 22...

Page 6: ...nal Showing Peak and RMS Power with Music Applied 3 20 3 17 Supply Current vs Peak Output Voltage of TPA005D02 vs TPA0202 with Music Input 3 21 3 18 Platform Signal Routing and Outputs 3 24 3 19 Mute...

Page 7: ...ss D Stereo Audio Amplifier Evaluation Module SLOP223 It includes a list of EVM features a brief description of the module illustrated with a pictorial diagram and a list of EVM specifications Topic P...

Page 8: ...luation Platform J Evaluation module is designed to simply plug into the platform automatically making all signal control and power connections J Platform provides flexible power options J Jumpers on...

Page 9: ...R4 R5 C8 C11 C27 C26 Shutdown Single in line header pins extend from the underside of the module circuit board to allow the EVM to either be plugged into the TI Plug N Play Audio Am plifier Evaluation...

Page 10: ...4 Introduction 1 3 TPA005D02 Class D EVM Specifications Supply voltage range VDD 4 5 V to 5 5 V Supply current IDD 2 8 A max Continuous output power per channel PO 4 BTL VDD 5 V 2 W Audio input volta...

Page 11: ...g connections directly to the module pins and it can be wired directly into existing circuits or equipment The platform switch and jumper settings shown in Table 2 1 are typical for the TPA005D02 clas...

Page 12: ...or both may result Figure 2 1 Quick Start Platform Map 3 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...

Page 13: ...S3 P N P Platform Mute X Lo Note 2 U5 Notes 1 X Don t care 2 Set S2 to ON when signal conditioning board is installed in U1 set S2 to OFF when no signal conditioning board is installed Power supply 7...

Page 14: ...ate right channel and left channel VDD supplies can be connected or a single supply can be used for both Inputs and outputs 3 Ensure that audio signal source level adjustments are set to minimum 4 Con...

Page 15: ...ule module performance graphs and module PCB layer illustrations Topic Page 3 1 Precautions 3 2 3 2 The TPA005D02 Audio Power Amplifier Evaluation Module 3 3 3 3 Using The TPA005D02 Class D EVM With t...

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: ...atform Figure 3 1 or wired directly into circuits or equipment The module has single in line header connector pins mounted to the underside of the board These pins allow the module to be plugged into...

Page 18: ...47 F 0 047 F C20 1 F 1 F 1 F C6 C8 C3 C2 470 pF 470 pF RIN RIN LIN LIN GND MUTE GND VDD VDD R1 20 K R2 1 K C1 1 F VDD D1 3 9 V R3 20 K S1 R4 100 K Q1 2N3906 U1 TPA005D02 R5 100 K S2 C4 0 22 F C27 220...

Page 19: ...Bridge LPF VCONTROL Load Ramp Generator PWM Control VOUT The audio input signal Vin is applied to a comparator along with a triangle wave created by the ramp generator Vramp When the triangle wave cr...

Page 20: ...ation which further enhances the amplifier performance 3 2 2 1 BTL Operation In the bridge tied load output mode the two output lines of each channel operate as mirror images of each other for increas...

Page 21: ...er and C 1 F for the value of capacitors C2 C3 C6 and C7 These values give a 3 dB point of 15 9 Hz close to the desired 3 dB point of 20 Hz Ceramic capacitors are preferred over electrolytic for their...

Page 22: ...ance The values used in the output filter are 15 H for the inductor and 0 22 F and 1 F capacitors in parallel for an equivalent capacitance of 2 22 F setting the cutoff frequency to 27 5 kHz The main...

Page 23: ...0 1 radian second which means that the components must be frequency scaled To frequency scale each component is divided by 0 2 fc fc is the desired cut off frequency in Hertz C SE 1 2 R L 0 L SE 2 R L...

Page 24: ...or loses its functionality and looks like a short circuit to the PWM signal which increases the harmonic distortion considerably A shielded inductor may be required if the class D amplifier is placed...

Page 25: ...aluminum electrolytic capacitors were chosen Tantalum capacitors provide a higher capacitance value in a smaller package and have lower ESR values than aluminum electrolytic capacitors SMT packages fu...

Page 26: ...attached If a voltage spike or current spike hits the ground plane the entire plane shifts up or down unlike a split plane which has inductance between the halves that dampens the noise and can cause...

Page 27: ...er when the amplifier IC is initially placed in shutdown The PNP transistor needs to be biased so that it is operational from at least 4 5 V to 5 5 V Zener diode D1 and resistors R1 R2 and R3 set the...

Page 28: ...operating the shutdown or mute switch Table 3 1 TPA005D02 Class D EVM Fault Indicator Table LED 1 LED 2 Fault Description OFF OFF No faults device is operating normally OFF ON Under voltage condition...

Page 29: ...r amplifier is designed to act as a variable resistor network between the power supply and the load The transistors operate in their linear region and voltage that is dropped across the transistors in...

Page 30: ...Figure 3 9 transitions between the supply voltage and slightly below ground The inductor and capacitor form a low pass filter which makes the output current equal to the average of the inductor curre...

Page 31: ...ciency h PL PSUP Efficiency h VDD VP2 2RL 2 p V P RL Efficiency h 1 Efficiency h p 4 V P V DD In the ideal efficiency equations assume that VP VDD which is the maximum sine wave magnitude without clip...

Page 32: ...on above 0 causes conduction loss Figure 3 13 shows an H bridge output circuit simplified for conduction loss analysis and can be used to determine new efficiencies with conduction losses included Fi...

Page 33: ...SW V DD 2RDS on R L 2RDS on 2 2RDS on Switching losses are constant at all output power levels which means that switching losses can be ignored at high power levels in most cases At low power levels h...

Page 34: ...ower results in a higher crest factor Crest Factor 10 log PPK Prms Figure 3 15 Audio Signal Showing Peak and RMS Power Time PPK Power PRMS Figure 3 16 is a comparison of a 5 V class D amplifier to a s...

Page 35: ...rent vs Peak Output Voltage of TPA005D02 vs TPA0202 with Music Input 400 350 250 200 150 0 300 1 1 5 2 2 5 Supply Current mA rms SUPPLY CURRENTS vs PEAK OUTPUT VOLTAGE AND PEAK OUTPUT POWER 4 3 3 5 10...

Page 36: ...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 37: ...le S1 connects the amplifier IC SHUTDOWN pin to ground forcing it into a low power state This function is not controlled by a control input to the module only by switch S1 The shutdown mode reduces th...

Page 38: ...t U1 if an EVM is installed there or socket U1 can be bypassed and the audio input signal applied directly to the inputs of the TPA005D02 class D EVM Platform switch S2 selects signal conditioning or...

Page 39: ...ound R4 and R5 The switch in the headphone jack pulls one line or the other up to VDD through a 240 resistor R3 depending on whether a plug is inserted in J10 or not Figure 3 19 Mute Mode and Polarity...

Page 40: ...connected to the platform should be capable of providing 5 A of current to avoid clipping of the output signal during peaks Current consumption driving speakers at normal listening levels is typicall...

Page 41: ...nnectors for stripped speaker wires J8 and optionally through a miniature 1 8 stereo phone jack J10 for headphones The audio output lines from the power amplifiers are separate all the way to the edge...

Page 42: ...are connected to ground Note that the mute signal applied to the EVM mute pin must be able to supply enough current to overcome the pullup resistor on the module 100 k Do not drive the module inputs...

Page 43: ...27M010 C24 C25 C26 C27 Capacitor Ceramic 0 22 F 25 V X7R 10 0603 4 muRata GRM39X7R224K10 C22 C23 Capacitor Metal Film 1 F 50 V 5 leaded 0 287 0 315 0 197 2 Panasonic ECQ V1H105JI D2 D3 LED SM Green 25...

Page 44: ...exhibits slightly less harmonic distortion at high power levels when used in the stand alone mode The EVM has a flat response over the audio frequency band as shown in Figure 3 22 Both channels track...

Page 45: ...igh power levels 40 mW to 1 9 W is a function of the output filter components particularly the inductors A slight increase in supply voltage over 5 V substantially reduces the harmonic distortion at p...

Page 46: ...t full output power which is the worst case scenario Crosstalk may be reduced by using shielded inductors in the output filter Figure 3 24 Distortion versus Frequency 10 0 1 20 100 1k THD N Total Harm...

Page 47: ...ained from any TI Sales Office Figure 3 26 TPA005D02 Class D EVM Silkscreen Texas Instruments 1998 R6 R7 VDD GND L1 L2 L3 L4 U1 C21 C19 C15 TPA005D02 EVM Board Rev A VDD GND C25 Lout Lout Mute Rout Ro...

Page 48: ...TPA005D02 Class D EVM PCB Layers 3 34 Details Figure 3 28 TPA005D02 Class D EVM 2nd Layer Figure 3 29 TPA005D02 Class D EVM 3rd Layer...

Page 49: ...TPA005D02 Class D EVM PCB Layers 3 35 Details Figure 3 30 TPA005D02 Class D EVM Bottom Layer...

Page 50: ...3 36 Details...

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