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TPA3008D2
www.ti.com
SLOS435A–MAY 2004–REVISED JULY 2004
10-W STEREO CLASS-D AUDIO POWER AMPLIFIER
FEATURES DESCRIPTION
• 10-W/Channel Into an 16-Ω Load From a
The TPA3008D2 is a 10-W (per channel) efficient,
17-V Supply
class-D audio amplifier for driving bridged-tied stereo
speakers. The TPA3008D2 can drive stereo speakers
• Up to 92% Efficient, Class-D Operation
as low as 8 Ω. The high efficiency of the TPA3008D2
Eliminates Need For Heatsinks
eliminates the need for external heatsinks when
•
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TPA3008D2 www.ti.com 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. ABSOLUTE MAXIMUM RATINGS (1) over operating free-air temperature range (unless otherwise noted) TPA3008D2 Supply voltage range AV , PV -0.3 V to 20 V CC CC Load Impedance, R ≥ 6 Ω L SHUTDOWN -0.3 V to VCC + 0.3 V Input voltage range, V I
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TPA3008D2 www.ti.com SLOS435A–MAY 2004–REVISED JULY 2004 AVAILABLE OPTIONS T PACKAGED DEVICE A (1) 48-PIN HTQFP (PHP) -40°C to 85°C TPA3008D2PHP (1) The PHP package is available taped and reeled. To order a taped and reeled part, add the suffix R to the part number (e.g., TPA3008D2PHPR). DC ELECTRICAL CHARACTERISTICS T = 25°C, V = 12 V, R = 8 Ω (unless otherwise noted) A CC L PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Class-D output offset voltage INN and INP connected together, |V | 2 5 55 mV O
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TPA3008D2 www.ti.com SLOS435A–MAY 2004–REVISED JULY 2004 FUNCTIONAL BLOCK DIAGRAM V2P5 PVCC V2P5 VClamp VCLAMPR Gen BSRN PVCCR(2) Gate ROUTN(2) Drive Deglitch and RINN PGNDR Gain PWM BSRP Adj. Mode RINP PVCCR(2) Logic V2P5 Gate ROUTP(2) Drive To Gain Adj. PGNDR 4 GAIN0 Gain Blocks and Control GAIN1 Start-up Logic FAULT V2P5 SC Detect ROSC Ramp Generator Biases Start-up and Thermal VDD and Protection COSC References Logic VDDok AVCC AV REF DD AVDD AVCC VCCok 5-V LDO AVDD PVCC AGND(2) TTL Input Bu
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TPA3008D2 www.ti.com SLOS435A–MAY 2004–REVISED JULY 2004 PHP PACKAGE (TOP VIEW) 48 47 46 45 44 43 42 41 40 39 38 37 1 36 VCLAMPR SHUTDOWN RINN 2 35 NC RINP 3 34 NC V2P5 4 33 AV CC LINP 5 32 NC LINN 6 NC 31 TPA3008D2 AV REF 7 30 AGND DD NC 8 29 AV DD 9 GAIN0 28 COSC 10 GAIN1 27 ROSC FAULT 11 26 AGND 12 NC VCLAMPL 25 13 14 15 16 17 18 19 20 21 22 23 24 5 BSLN BSRN PVCCL PVCCR PVCCL PVCCR LOUTN ROUTN LOUTN ROUTN PGNDL PGNDR PGNDL PGNDR LOUTP ROUTP LOUTP ROUTP PVCCL PVCCR PVCCL PVCCR BSLP BSRP
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TPA3008D2 www.ti.com SLOS435A–MAY 2004–REVISED JULY 2004 TERMINAL FUNCTIONS PIN NAME PIN NUMBER I/O DESCRIPTION AGND 26, 30 - Analog ground for digital/analog cells in core AV 33 - High-voltage analog power supply, not connected internally to PVCCR or PVCCL CC 5-V Regulated output for use by internal cells and GAIN0, GAIN1 pins only. Not AV 29 O DD specified for driving other external circuitry. AV REF 7 O 5-V Reference output—connect to gain setting resistor or directly to GAIN0, GAIN1. DD BSLN
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TPA3008D2 www.ti.com SLOS435A–MAY 2004–REVISED JULY 2004 TYPICAL CHARACTERISTICS 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 V Supply current vs Total output power 12 CC Crosstalk vs Frequency 13 k Supply ripple rejection ratio vs Frequency 14 SVR CMRR Commom-mode reject
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TPA3008D2 www.ti.com SLOS435A–MAY 2004–REVISED JULY 2004 TOTAL HARMONIC DISTORTION + NOISE TOTAL HARMONIC DISTORTION + NOISE vs vs FREQUENCY FREQUENCY 10 10 V = 12 V, V = 18 V, CC CC R = 8 R = 8 , L L Gain = 21.6 dB Gain = 21.6 dB 1 1 P = 0.5 W P = 2.5 W O O 0.1 P = 1 W O 0.1 P = 1 W O P = 2.5 W O 0.01 P = 5 W O 0.01 0.005 20 100 20 100 1 k 10 k 20 k 1 k 10 k 20 k f − Frequency − Hz f − Frequency − Hz Figure 3. Figure 4. TOTAL HARMONIC DISTORTION + NOISE TOTAL HARMONIC DISTORTION + NOISE vs v
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TPA3008D2 www.ti.com SLOS435A–MAY 2004–REVISED JULY 2004 OUTPUT POWER vs CLOSED-LOOP RESPONSE SUPPLY VOLTAGE 40 12 11 R = 16 36 150 L 10 32 100 9 28 THD+N = 10% Gain 8 50 24 7 Phase 20 0 6 5 16 THD+N = 1% −50 4 12 3 V = 12 V, CC 8 −100 R = 8 Ω, L 2 Gain = 32 dB 4 33 kHz, RC LPF 1 −150 0 0 10 100 1k 10k 80k 8 9 10 11 12 13 14 15 16 17 18 V − Supply Voltage − V f − Frequency − Hz CC Figure 7. Figure 8. OUTPUT POWER EFFICIENCY vs vs SUPPLY VOLTAGE OUTPUT POWER 12 100 V = 18 V, R = 8 CC L R = 16
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TPA3008D2 www.ti.com SLOS435A–MAY 2004–REVISED JULY 2004 EFFICIENCY SUPPLY CURRENT vs vs TOTAL OUTPUT POWER TOTAL OUTPUT POWER 100 2.0 LC Filter, 16 Resistive Load, 1.8 90 Stereo Operation 1.6 80 8 V = 12 V, CC 70 1.4 R = 8 L 60 1.2 V = 12 V, CC 50 1 R = 16 L 40 0.8 30 0.6 V = 18 V, CC R = 16 L V = 12 V, CC 20 0.4 LC Filter, Resistive Load, 10 0.2 Stereo Operation 0 0 0 1 2 3 4 5 6 7 8 9 10 11 12 0 2 4 6 8 10 12 14 16 18 20 P − Total Output Power − W P − Total Output Power − W O O Fig
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TPA3008D2 www.ti.com SLOS435A–MAY 2004–REVISED JULY 2004 COMMON-MODE REJECTION RATIO vs FREQUENCY 0 V = 12 V, CC Gain = 15.6 dB, −10 R = 8 L Output Referred −20 −30 −40 −50 −60 −70 20 100 1 k 10 k 20 k f − Frequency − Hz Figure 15. 11 CMRR − Common-Mode Rejection Ratio − dB
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TPA3008D2 www.ti.com SLOS435A–MAY 2004–REVISED JULY 2004 APPLICATION INFORMATION 1 nF 1 nF PVCC PVCC 220 nF 220 nF 10 F 10 F 0.1 F 0.1 F 1 F Shutdown/Mute Control SHUTDOWN VCLAMPR RINN NC Right Differential 0.47 F Inputs NC RINP AVCC 0.47 F V2P5 AVCC 0.47 F LINP Left Differential NC 0.47 F Inputs LINN NC 0.1 F 10 F TPA3008D2 0.47 F AVDDREF AGND NC AVDD 1 F GAIN0 COSC Gain 220 pF GAIN1 ROSC Control 120 k Fault Reporting AGND FAULT VCLAMPL NC 1 F 0.1 F 0.1 F 10 F 10 F 220 nF
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TPA3008D2 www.ti.com SLOS435A–MAY 2004–REVISED JULY 2004 APPLICATION INFORMATION (continued) CLASS-D OPERATION This section focuses on the class-D operation of the TPA3008D2. Traditional Class-D Modulation Scheme The traditional class-D modulation scheme, which is used in the TPA032D0x family, has a differential output where each output is 180 degrees out of phase and changes from ground to the supply voltage, V . Therefore, CC the differential prefiltered output varies between positive and nega
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TPA3008D2 www.ti.com SLOS435A–MAY 2004–REVISED JULY 2004 APPLICATION INFORMATION (continued) OUTP OUTN Output = 0 V Differential +12 V Voltage 0 V Across −12 V Load Current OUTP OUTN Output > 0 V Differential +12 V Voltage 0 V Across −12 V Load Current Figure 18. The TPA3008D2 Output Voltage and Current Waveforms Into an Inductive Load Efficiency: LC Filter Required With the Traditional Class-D Modulation Scheme The main reason that the traditional class-D amplifier needs an output filter is tha
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TPA3008D2 www.ti.com SLOS435A–MAY 2004–REVISED JULY 2004 APPLICATION INFORMATION (continued) Effects of Applying a Square Wave Into a Speaker Audio specialists have advised for years not to apply a square wave to speakers. If the amplitude of the waveform is high enough and the frequency of the square wave is within the bandwidth of the speaker, the square wave could cause the voice coil to jump out of the air gap and/or scar the voice coil. A 250-kHz switching 2 frequency, however, does not sig
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TPA3008D2 www.ti.com SLOS435A–MAY 2004–REVISED JULY 2004 APPLICATION INFORMATION (continued) 33 μH OUTP C 2 L 1 C 1 0.1 μF 0.47 μF 33 μH OUTN C 3 L 2 0.1 μF Figure 19. Typical LC Output Filter, Cutoff Frequency of 27 kHz, Speaker Impedance = 8 Ω Ferrite Chip Bead OUTP 1 nF Ferrite Chip Bead OUTN 1 nF Figure 20. Typical Ferrite Chip Bead Filter (Chip bead example: Fair-Rite 2512067007Y3) Gain setting via GAIN0 and GAIN1 inputs The gain of the TPA3008D2 is set by two input terminals, GAIN0 and GAI
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TPA3008D2 www.ti.com SLOS435A–MAY 2004–REVISED JULY 2004 Z f C i Z i IN Input Signal The -3-dB frequency can be calculated using Equation 5. Use Table 1 for Z values. i 1 f 2 Z C i i (5) INPUT CAPACITOR, C I In the typical application, an input capacitor (C ) is required to allow the amplifier to bias the input signal to the i proper dc level for optimum operation. In this case, C and the input impedance of the amplifier (Z ) form a i i high-pass filter with the corner frequency determined in
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TPA3008D2 www.ti.com SLOS435A–MAY 2004–REVISED JULY 2004 BSN and BSP Capacitors The full H-bridge output stages use only NMOS transistors. Therefore, they require bootstrap capacitors for the high side of each output to turn on correctly. A 220-nF ceramic capacitor, rated for at least 25 V, must be connected from each output to its corresponding bootstrap input. Specifically, one 220-nF capacitor must be connected from xOUTP to xBSP, and one 220-nF capacitor must be connected from xOUTN to xBSN.
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TPA3008D2 www.ti.com SLOS435A–MAY 2004–REVISED JULY 2004 SHORT-CIRCUIT PROTECTION AND AUTOMATIC RECOVERY FEATURE The TPA3008D2 has short-circuit protection circuitry on the outputs that prevents damage to the device during output-to-output shorts, output-to-GND shorts, and output-to-V shorts. When a short circuit is detected on the CC outputs, the part immediately disables the output drive. This is a latched fault and must be reset by cycling the voltage on the SHUTDOWN pin to a logic low and ba
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TPA3008D2 www.ti.com 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) • Linear regulated power supply • Filter components • EVM or other complete audio circuit Figure 21 shows the block diagrams of basic measurement systems for class-AB and class-D amplifiers. A s
