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10-W STEREO CLASS-D AUDIO POWER AMPLIFIER
FEATURES
10-W/Channel Into an 16-
17-V Supply
Up to 92% Efficient, Class-D Operation
Eliminates Need For Heatsinks
8.5-V to 18-V Single-Supply Operation
Four Selectable, Fixed Gain Settings
Differential Inputs Minimizes Common-Mode
Noise
Space-Saving, Thermally Enhanced
PowerPAD™ Packaging
Thermal and Short-Circuit Protection
With Auto Recovery Option
Pinout Similar to TPA3000D Family
APPLICATIONS
LCD Monitors and TVs
All-In-One PCs
Shutdown/Mute
Control
Right Differential
Inputs
Left Differential
Inputs
Gain
Control
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PowerPAD is a trademark of Texas Instruments.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Load From a
PVCC
10 F
220 nF
0.1 F
SHUTDOWN
RINN
0.47 F
RINP
0.47 F
V2P5
0.47 F
LINP
0.47 F
LINN
TPA3008D2
0.47 F
AVDDREF
NC
GAIN0
GAIN1
FAULT
NC
0.1 F
10 F
220 nF
PVCC
SLOS435A – MAY 2004 – REVISED JULY 2004
DESCRIPTION
The TPA3008D2 is a 10-W (per channel) efficient,
class-D audio amplifier for driving bridged-tied stereo
speakers. The TPA3008D2 can drive stereo speakers
as low as 8
. The high efficiency of the TPA3008D2
eliminates the need for external heatsinks when
playing music.
The gain of the amplifier is controlled by two gain
select pins. The gain selections are 15.3, 21.2, 27.2,
and 31.8 dB.
The outputs are fully protected against shorts to
GND, VCC, and output-to-output shorts. A fault ter-
minal allows short-circuit fault reporting and automatic
recovery. Thermal protection ensures that the maxi-
mum junction temperature is not exceeded.
PVCC
10 F
220 nF
0.1 F
1 F
VCLAMPR
NC
NC
AVCC
NC
NC
0.1 F
AGND
AVDD
COSC
220 pF
ROSC
AGND
VCLAMPL
1 F
0.1 F
10 F
220 nF
PVCC
†
†Optional output filter for EMI suppression
Copyright © 2004, Texas Instruments Incorporated
TPA3008D2
AVCC
10 F
1 F
120 k
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Summary of Contents for Texas Instruments TPA3008D2
- Page 1 Instruments standard warranty. Production processing does not necessarily include testing of all parameters. DESCRIPTION Load From a The TPA3008D2 is a 10-W (per channel) efficient, class-D audio amplifier for driving bridged-tied stereo speakers. The TPA3008D2 can drive stereo speakers as low as 8 eliminates the need for external heatsinks when playing music.
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Page 2: Shutdown
TPA3008D2 SLOS435A – MAY 2004 – REVISED JULY 2004 These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. -
Page 3: Available Options
= 1 W, R , Gain = 15.6 dB, f = 1 kHz Maximum output at THD+N < 0.5%, f = 1 kHz, Gain = 15.6 dB TPA3008D2 SLOS435A – MAY 2004 – REVISED JULY 2004 1100 1300 14.6 15.3 16.2... -
Page 4: Rinp
TPA3008D2 SLOS435A – MAY 2004 – REVISED JULY 2004 V2P5 V2P5 RINN Gain Adj. RINP V2P5 To Gain Adj. GAIN0 Gain Blocks and Control GAIN1 Start-up Logic ROSC COSC AVDD AVDD TTL Input SHUTDOWN Buffer (VCC Compl) V2P5 LINN Gain Adj. -
Page 5: Table Of Contents
GAIN0 GAIN1 FAULT 13 14 PHP PACKAGE (TOP VIEW) 46 45 44 43 42 41 40 39 38 TPA3008D2 15 16 17 18 19 20 21 22 23 TPA3008D2 SLOS435A – MAY 2004 – REVISED JULY 2004 VCLAMPR AGND COSC... -
Page 6: Linp
TPA3008D2 SLOS435A – MAY 2004 – REVISED JULY 2004 PIN NAME PIN NUMBER AGND 26, 30 BSLN BSLP BSRN BSRP COSC FAULT GAIN0 GAIN1 LINN LINP LOUTN 16, 17 LOUTP 20, 21 8, 12, 31, 32, 34, 35 PGNDL 18, 19... -
Page 7: Typical Characteristics
Frequency TOTAL HARMONIC DISTORTION + NOISE = 16 W, Gain = 21.6 dB 0.01 10 k 20 k TPA3008D2 SLOS435A – MAY 2004 – REVISED JULY 2004 FIGURE 1, 2, 3, 4 5, 6 8, 9 FREQUENCY = 18 V, = 0.5 W... - Page 8 TPA3008D2 SLOS435A – MAY 2004 – REVISED JULY 2004 TOTAL HARMONIC DISTORTION + NOISE FREQUENCY = 12 V, = 8 W Gain = 21.6 dB = 0.5 W 0.01 f − Frequency − Hz Figure 3. TOTAL HARMONIC DISTORTION + NOISE...
- Page 9 − Supply Voltage − V Figure 9. −50 −100 −150 = 16 W TPA3008D2 SLOS435A – MAY 2004 – REVISED JULY 2004 OUTPUT POWER SUPPLY VOLTAGE = 16 W THD+N = 10% THD+N = 1% − Supply Voltage − V Figure 8.
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Page 10: Gain0
TPA3008D2 SLOS435A – MAY 2004 – REVISED JULY 2004 EFFICIENCY TOTAL OUTPUT POWER 16 W LC Filter, Resistive Load, Stereo Operation − Total Output Power − W Figure 11. CROSSTALK FREQUENCY = 12 V, = 2.5 W, −10 Gain = 21.6 dB = 8W −20... -
Page 11: Gain1
−40 −50 −60 −70 COMMON-MODE REJECTION RATIO FREQUENCY = 12 V, Gain = 15.6 dB, = 8 W, Output Referred f − Frequency − Hz Figure 15. TPA3008D2 SLOS435A – MAY 2004 – REVISED JULY 2004 10 k 20 k... -
Page 12: Avddref
TPA3008D2 SLOS435A – MAY 2004 – REVISED JULY 2004 Shutdown/Mute Control Right Differential 0.47 mF Inputs 0.47 mF 0.47 mF Left Differential 0.47 mF Inputs 0.47 mF Gain Control Fault Reporting Chip ferrite bead (example: Fair-Rite 251206700743) shown for EMI suppression. -
Page 13: Slos435A – May 2004 – Revised July
TPA3008D2 Modulation Scheme The TPA3008D2 uses a modulation scheme that still has each output switching from 0 to the supply voltage. However, OUTP and OUTN are now in phase with each other with no input. The duty cycle of OUTP is greater than 50% and OUTN is less than 50% for positive output voltages. - Page 14 The speaker is both resistive and reactive, whereas an LC filter is almost purely reactive. The TPA3008D2 modulation scheme has little loss in the load without a filter because the pulses are short and the change in voltage is V instead of 2 x V ripple current larger.
- Page 15 When to Use an Output Filter for EMI Suppression Design the TPA3008D2 without the filter if the traces from amplifier to speaker are short (< 50 cm). Powered speakers, where the speaker is in the same enclosure as the amplifier, is a typical application for class-D without a filter.
-
Page 16: Input Resistance
For design purposes, the input network (discussed in the next section) should be designed assuming an input impedance of 26 k , which is the absolute minimum input impedance of the TPA3008D2. At the lower gain settings, the input impedance could increase as high as 165 k... - Page 17 For the best pop performance, C Power Supply Decoupling,C The TPA3008D2 is a high-performance CMOS audio amplifier that requires adequate power supply decoupling to ensure that the output total harmonic distortion (THD) is as low as possible. Power supply decoupling also prevents oscillations for long lead lengths between the amplifier and the speaker.
-
Page 18: Shutdown Operation
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 source to the INN input. -
Page 19: Thermal Protection
20 C. The device begins normal operation at this point with no external system interaction. PRINTED-CIRCUIT BOARD (PCB) LAYOUT Because the TPA3008D2 is a class-D amplifier that switches at a high frequency, the layout of the printed-circuit board (PCB) should be optimized according to the following guidelines for the best possible performance. - Page 20 TPA3008D2 SLOS435A – MAY 2004 – REVISED JULY 2004 BASIC MEASUREMENT SYSTEM This application note focuses on methods that use the basic equipment listed below: Audio analyzer or spectrum analyzer Digital multimeter (DMM) Oscilloscope Twisted-pair wires Signal generator Power resistor(s)
- Page 21 For efficiency measurements with filter-free class-D, R The TPA3008D2 uses a modulation scheme that does not require an output filter for operation, but they do sometimes require an RC low-pass filter when making measurements. This is because some analyzer inputs cannot accurately process the rapidly changing square-wave output and therefore record an extremely high level of distortion.
- Page 22 TPA3008D2 SLOS435A – MAY 2004 – REVISED JULY 2004 Evaluation Module Generator Twisted-Pair Wire Figure 22. Differential Input, BTL Output Measurement Circuit The generator should have balanced outputs, and the signal should be balanced for best results. An unbalanced output can be used, but it may create a ground loop that affects the measurement accuracy. The analyzer must also have balanced inputs for the system to be fully balanced, thereby cancelling out any common-mode noise in the circuit and providing the most accurate measurement.
- Page 23 20 kHz. C , however, was calculated to be 57,000 pF, but FILT FILT 1000 TPA3008D2 SLOS435A – MAY 2004 – REVISED JULY 2004 AP Analyzer Input FILT , the highest frequency of the measurement . The value of R and R .
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Page 25: Packaging Information
www.ti.com PACKAGING INFORMATION Orderable Device Status TPA3008D2PHP ACTIVE TPA3008D2PHPG4 ACTIVE TPA3008D2PHPR ACTIVE TPA3008D2PHPRG4 ACTIVE The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. - Page 26 PACKAGE MATERIALS INFORMATION www.ti.com 5-Oct-2007 TAPE AND REEL BOX INFORMATION Device Package Pins Site Reel Reel A0 (mm) B0 (mm) K0 (mm) Pin1 Diameter Width (mm) (mm) Quadrant (mm) (mm) TPA3008D2PHPR SITE 60 Pack Materials-Page 1...
- Page 27 PACKAGE MATERIALS INFORMATION www.ti.com 5-Oct-2007 Device Package Pins Site Length (mm) Width (mm) Height (mm) TPA3008D2PHPR SITE 60 346.0 346.0 33.0 Pack Materials-Page 2...
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Page 31: Important Notice
TI as compliant with ISO/TS 16949 requirements. Buyers acknowledge and agree that, if they use any non-designated products in automotive applications, TI will not be responsible for any failure to meet such requirements. Following are URLs where you can obtain information on other Texas Instruments products and application solutions: Products Amplifiers amplifier.ti.com...
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