Texas Instruments TPA3008D2, User Manual

Page 1: ... need for external heatsinks when 8 5 V to 18 V Single Supply Operation playing music Four Selectable Fixed Gain Settings The gain of the amplifier is controlled by two gain Differential Inputs Minimizes Common Mode select pins The gain selections are 15 3 21 2 27 2 Noise and 31 8 dB Space Saving Thermally Enhanced The outputs are fully protected against shorts to PowerPAD Packaging GND VCC and ou...

Page 2: ...l operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is not implied Exposure to absolute maximum rated conditions for extended periods may affect device reliability DERATING PACKAGE TA 25 C θJC FACTOR TA 70 C TA 85 C 1 θJA PHP 4 3 W 1 14 C W 1 34 7 mW C 1 2 7 W 2 2 W 1 Based on a JEDEC high K PCB with the PowerPAD soldered to a th...

Page 3: ...ode High side 600 VCC 12 V rDS on Drain source on state resistance IO 1 A Low side 500 mΩ TJ 25 C Total 1100 1300 GAIN0 0 8 V 14 6 15 3 16 2 GAIN1 0 8 V GAIN0 2 V 20 5 21 2 21 8 G Gain dB GAIN0 0 8 V 26 4 27 2 27 8 GAIN1 2 V GAIN0 2 V 31 1 31 8 32 5 ton Turnon time C V2P5 1 µF SHUTDOWN 2 V 16 ms toff Turnoff time C V2P5 1 µF SHUTDOWN 0 8 V 60 µs TA 25 C VCC 12 V RL 8 Ω unless otherwise noted PARAM...

Page 4: ... and PWM Mode Logic Gain Adj LINP LINN Gate Drive VClamp Gen Gate Drive PVCC BSRP PVCCR 2 ROUTP 2 PGNDR PGNDR ROUTN 2 PVCCR 2 BSRN Gate Drive VClamp Gen Gate Drive PVCC BSLP PVCCL 2 LOUTP 2 PGNDL PGNDL LOUTN 2 PVCCL 2 BSLN VCLAMPL VCLAMPR GAIN0 4 To Gain Adj Blocks and Start up Logic SHUTDOWN V2P5 V2P5 V2P5 AVCC AGND 2 V2P5 V2P5 Deglitch GAIN1 AVDDREF FAULT TPA3008D2 SLOS435A MAY 2004 REVISED JULY...

Page 5: ...12 BSRN PVCCR PVCCR ROUTN ROUTN PGNDR PGNDR ROUTP ROUTP PVCCR PVCCR BSRP VCLAMPR NC NC NC NC AGND COSC ROSC AGND VCLAMPL SHUTDOWN RINN RINP V2P5 LINP LINN NC GAIN0 GAIN1 FAULT NC BSLN PVCCL PVCCL LOUTN LOUTN PGNDL PGNDL LOUTP LOUTP PVCCL PVCCL BSLP TPA3008D2 AVCC AVDD AVDDREF TPA3008D2 SLOS435A MAY 2004 REVISED JULY 2004 PHP PACKAGE TOP VIEW 5 ...

Page 6: ...ridge negative output for left channel LOUTP 20 21 O Class D 1 2 H bridge positive output for left channel 8 12 31 32 NC No internal connection 34 35 PGNDL 18 19 Power ground for left channel H bridge PGNDR 42 43 Power ground for right channel H bridge Power supply for left channel H bridge internally connected to pins 22 and 23 not PVCCL 14 15 connected to PVCCR or AVCC Power supply for left chan...

Page 7: ...SED JULY 2004 TABLE OF GRAPHS FIGURE THD N Total harmonic distortion noise vs Frequency 1 2 3 4 THD N Total harmonic distortion noise vs Output power 5 6 Closed loop response 7 Output power vs Supply voltage 8 9 Efficiency vs Output power 10 Efficiency vs Total output power 11 VCC Supply current vs Total output power 12 Crosstalk vs Frequency 13 kSVR Supply ripple rejection ratio vs Frequency 14 C...

Page 8: ...HD N Total Harmonic Distortion Noise PO Output Power W VCC 12 V RL 8 Gain 21 6 dB 20 200 m 2 1 kHz 20 20 Hz 20 kHz 0 01 10 0 1 1 20m 10 100 m 1 THD N Total Harmonic Distortion Noise PO Output Power W VCC 18 V RL 16 Gain 21 6 dB 20 Hz 20 200 m 2 20 kHz 1 kHz TPA3008D2 SLOS435A MAY 2004 REVISED JULY 2004 TOTAL HARMONIC DISTORTION NOISE TOTAL HARMONIC DISTORTION NOISE vs vs FREQUENCY FREQUENCY Figure...

Page 9: ...ge V 2 3 4 5 6 7 8 9 8 9 10 11 12 13 14 THD N 1 THD N 10 RL 8 VCC Supply Voltage V P O Output Power W 10 11 12 Power represented by dashed line may require external heatsinking 0 10 20 30 40 50 60 70 0 1 2 3 4 5 6 PO Output Power Per Channel W Efficiency 80 90 100 7 8 9 10 VCC 18 V RL 16 TPA3008D2 SLOS435A MAY 2004 REVISED JULY 2004 OUTPUT POWER vs CLOSED LOOP RESPONSE SUPPLY VOLTAGE Figure 7 Figu...

Page 10: ...RL 16 VCC 12 V RL 16 VCC 12 V RL 8 100 90 80 70 60 50 40 30 20 10 0 20 100 1 k 10 k Crosstalk dB f Frequency Hz VCC 12 V PO 2 5 W Gain 21 6 dB RL 8 20 k 100 90 80 70 60 50 40 20 100 1 k 10 k f Frequency Hz k SVR Supply Ripple Rejection Ratio dB VCC 12 V V RIPPLE 200 mVPP RL 8 Gain 15 6 dB 20 k 30 20 10 0 TPA3008D2 SLOS435A MAY 2004 REVISED JULY 2004 EFFICIENCY SUPPLY CURRENT vs vs TOTAL OUTPUT POW...

Page 11: ...30 20 10 0 100 1 k 10 k 20 VCC 12 V Gain 15 6 dB RL 8 Output Referred f Frequency Hz CMRR Common Mode Rejection Ratio dB 20 k TPA3008D2 SLOS435A MAY 2004 REVISED JULY 2004 COMMON MODE REJECTION RATIO vs FREQUENCY Figure 15 11 ...

Page 12: ... COSC ROSC AVCC VCLAMPL BSRP PVCCR PVCCR ROUTP ROUTP PGNDR PGNDR ROUTN ROUTN PVCCR PVCCR BSRN RINN AVCC AGND 10 F 10 F 0 1 F 0 1 F 0 47 F 0 47 F 0 47 F 0 47 F 0 47 F 0 1 F 0 1 F 10 F 10 F 1 F 120 k 1 F NC NC NC FAULT 0 1 F 10 F 1 F Control Left Differential Inputs Gain Control 1 nF 1 nF Chip ferrite bead example Fair Rite 251206700743 shown for EMI suppression 1 nF 1 nF Fault Reporting TPA3008D2 S...

Page 13: ...ation scheme with voltage and current waveforms is shown in Figure 17 Note that even at an average of 0 V across the load 50 duty cycle the current to the load is high causing high loss and thus causing a high supply current Figure 17 Traditional Class D Modulation Scheme s Output Voltage and Current Waveforms Into an Inductive Load With No Input The TPA3008D2 uses a modulation scheme that still h...

Page 14: ...ltage swing is 2 x VCC and the time at each voltage is half the period for the traditional modulation scheme An ideal LC filter is needed to store the ripple current from each half cycle for the next half cycle while any resistance causes power dissipation The speaker is both resistive and reactive whereas an LC filter is almost purely reactive The TPA3008D2 modulation scheme has little loss in th...

Page 15: ... Ω speaker was 81 The power not accounted for as dissipated across the rDS on may be calculated by simply subtracting the theoretical power from the measured power The quiescent supply current at 12 V is measured to be 22 mA It can be assumed that the quiescent current encapsulates all remaining losses in the device i e biasing and switching losses It may be assumed that any remaining power is dis...

Page 16: ...l gain settings are controlled by ratios of resistors so the gain variation from part to part is small However the input impedance may shift by 20 due to shifts in the actual resistance of the input resistors For design purposes the input network discussed in the next section should be designed assuming an input impedance of 26 kΩ which is the absolute minimum input impedance of the TPA3008D2 At t...

Page 17: ...ul headroom especially in high gain applications For this reason a low leakage tantalum or ceramic capacitor is the best choice When polarized capacitors are used the positive side of the capacitor should face the amplifier input in most applications as the dc level there is held at 2 5 V which is likely higher than the source dc level Note that it is important to confirm the capacitor polarity in...

Page 18: ...lator stable This regulated voltage can be used to control GAIN0 and GAIN1 terminals but should not be used to drive external circuitry The differential input stage of the amplifier cancels any noise that appears on both input lines of the channel To use the TPA3008D2 with a differential source connect the positive lead of the audio source to the INP input and the negative lead from the audio sour...

Page 19: ... 4 capacitor AVDD pin 29 capacitor and VCLAMP pins 25 and 36 capacitor should also be placed as close to the device as possible Large 10 µF or greater bulk power supply decoupling capacitors should be placed near the TPA3008D2 on the PVCCL PVCCR and AVCC terminals Grounding The AVCC pin 33 decoupling capacitor AVDD pin 29 capacitor V2P5 pin 4 capacitor COSC pin 28 capacitor and ROSC pin 27 resisto...

Page 20: ...eference 1 by Audio Precision includes the signal generator and analyzer in one package The generator output and amplifier input must be ac coupled However the EVMs already have the ac coupling capacitors CIN so no additional coupling is required The generator output impedance should be low to avoid attenuating the test signal and is important because the input resistance of APAs is not high Conve...

Page 21: ...rtion The RC low pass measurement filter is used to remove the modulated waveforms so the analyzer can measure the output sine wave All of the class D APAs and many class AB APAs have differential inputs and bridge tied load BTL outputs Differential inputs have two input pins per channel and amplify the difference in voltage between the pins Differential inputs reduce the common mode noise and dis...

Page 22: ...e dc or ac power loss that occurs as the current flows through the cable These recommendations are based on 12 inch long wire with a 20 kHz sine wave signal at 25 C Table 2 Recommended Minimum Wire Size for Power Cables DC POWER LOSS AC POWER LOSS POUT W RL Ω AWG Size MW MW 10 4 18 22 16 40 18 42 2 4 18 22 3 2 8 3 7 8 5 1 8 22 28 2 8 2 1 8 1 0 75 8 22 28 1 5 6 1 1 6 6 2 An RC filter is used to red...

Page 23: ...uces the measurement error to less than 1 for RANA 10 kΩ An exception occurs with the efficiency measurements where RFILT must be increased by a factor of ten to reduce the current shunted through the filter CFILT must be decreased by a factor of ten to maintain the same cutoff frequency See Table 3 for the recommended filter component values Once fC is determined and RFILT is selected the filter ...

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Page 25: ...rials Where designed to be soldered at high temperatures TI Pb Free products are suitable for use in specified lead free processes Pb Free RoHS Exempt This component has a RoHS exemption for either 1 lead based flip chip solder bumps used between the die and package or 2 lead based die adhesive used between the die and leadframe The component is otherwise considered Pb Free RoHS compatible as defi...

Page 26: ... Device Package Pins Site Reel Diameter mm Reel Width mm A0 mm B0 mm K0 mm P1 mm W mm Pin1 Quadrant TPA3008D2PHPR PHP 48 SITE 60 330 16 9 6 9 6 1 5 12 16 Q2 PACKAGE MATERIALS INFORMATION www ti com 5 Oct 2007 Pack Materials Page 1 ...

Page 27: ...Device Package Pins Site Length mm Width mm Height mm TPA3008D2PHPR PHP 48 SITE 60 346 0 346 0 33 0 PACKAGE MATERIALS INFORMATION www ti com 5 Oct 2007 Pack Materials Page 2 ...

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Page 31: ...ice and is an unfair and deceptive business practice TI is not responsible or liable for any such statements TI products are not authorized for use in safety critical applications such as life support where a failure of the TI product would reasonably be expected to cause severe personal injury or death unless officers of the parties have executed an agreement specifically governing such use Buyer...