SLOS838C July   2013  – August 2015 TAS5731M

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1  Absolute Maximum Ratings
    2. 7.2  ESD Ratings
    3. 7.3  Recommended Operating Conditions
    4. 7.4  Thermal Information
    5. 7.5  PWM Operation at Recommended Operating Conditions
    6. 7.6  DC Electrical Characteristics
    7. 7.7  AC Electrical Characteristics (BTL, PBTL)
    8. 7.8  Electrical Characteristics - PLL External Filter Components
    9. 7.9  Electrical Characteristic - I2C Serial Control Port Operation
    10. 7.10 Timing Requirements - PLL Input Parameters
    11. 7.11 Timing Requirements - Serial Audio Ports Slave Mode
    12. 7.12 Timing Requirements - I2C Serial Control Port Operation
    13. 7.13 Timing Requirements - Reset (RESET)
    14. 7.14 Typical Characteristics
      1. 7.14.1 Typical Characteristics, 2.1 SE Configuration, 4 Ω
      2. 7.14.2 Typical Characteristics, 2.0 BTL Configuration, 8 Ω
      3. 7.14.3 Typical Characteristics, PBTL Configuration, 8 Ω
  8. 8 Parameter Measurement Information
  9. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagrams
    3. 9.3 Feature Description
      1. 9.3.1  Power Supply
      2. 9.3.2  I2C Address Selection and Fault Output
      3. 9.3.3  Single-Filter PBTL Mode
      4. 9.3.4  Device Protection System
        1. 9.3.4.1 Overcurrent (OC) Protection With Current Limiting
        2. 9.3.4.2 Overtemperature Protection
        3. 9.3.4.3 Undervoltage Protection (UVP) and Power-On Reset (POR)
      5. 9.3.5  SSTIMER Functionality
      6. 9.3.6  Clock, Autodetection, and PLL
      7. 9.3.7  PWM Section
      8. 9.3.8  2.1-Mode Support
      9. 9.3.9  I2C Compatible Serial Control Interface
      10. 9.3.10 Audio Serial Interface
        1. 9.3.10.1 I2S Timing
        2. 9.3.10.2 Left-Justified
        3. 9.3.10.3 Right-Justified
      11. 9.3.11 Dynamic Range Control (DRC)
    4. 9.4 Device Functional Modes
      1. 9.4.1 Stereo BTL Mode
      2. 9.4.2 Mono PBTL Mode
      3. 9.4.3 2.1 Mode
    5. 9.5 Programming
      1. 9.5.1 I2C Serial Control Interface
        1. 9.5.1.1 General I2C Operation
        2. 9.5.1.2 Single- and Multiple-Byte Transfers
        3. 9.5.1.3 Single-Byte Write
        4. 9.5.1.4 Multiple-Byte Write
        5. 9.5.1.5 Single-Byte Read
        6. 9.5.1.6 Multiple-Byte Read
      2. 9.5.2 26-Bit 3.23 Number Format
    6. 9.6 Register Maps
      1. 9.6.1  Clock Control Register (0x00)
      2. 9.6.2  Device ID Register (0x01)
      3. 9.6.3  Error Status Register (0x02)
      4. 9.6.4  System Control Register 1 (0x03)
      5. 9.6.5  Serial Data Interface Register (0x04)
      6. 9.6.6  System Control Register 2 (0x05)
      7. 9.6.7  Soft Mute Register (0x06)
      8. 9.6.8  Volume Registers (0x07, 0x08, 0x09, 0x0A)
      9. 9.6.9  Volume Configuration Register (0x0E)
      10. 9.6.10 Modulation Limit Register (0x10)
      11. 9.6.11 Interchannel Delay Registers (0x11, 0x12, 0x13, and 0x14)
      12. 9.6.12 PWM Shutdown Group Register (0x19)
      13. 9.6.13 Start/Stop Period Register (0x1A)
      14. 9.6.14 Oscillator Trim Register (0x1B)
      15. 9.6.15 BKND_ERR Register (0x1C)
      16. 9.6.16 Input Multiplexer Register (0x20)
      17. 9.6.17 Channel 4 Source Select Register (0x21)
      18. 9.6.18 PWM Output Mux Register (0x25)
      19. 9.6.19 DRC Control Register (0x46)
      20. 9.6.20 Bank Switch and EQ Control Register (0x50)
  10. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Applications
      1. 10.2.1 Stereo Bridge Tied Load Application
        1. 10.2.1.1 Design Requirements
        2. 10.2.1.2 Detailed Design Procedure
          1. 10.2.1.2.1 Component Selection and Hardware Connections
          2. 10.2.1.2.2 I2C Pullup Resistors
          3. 10.2.1.2.3 Digital I/O Connectivity
          4. 10.2.1.2.4 Recommended Start-Up and Shutdown Procedures
            1. 10.2.1.2.4.1 Initialization Sequence
            2. 10.2.1.2.4.2 Normal Operation
            3. 10.2.1.2.4.3 Shutdown Sequence
            4. 10.2.1.2.4.4 Power-Down Sequence
        3. 10.2.1.3 Application Curves
      2. 10.2.2 Mono Parallel Bridge Tied Load Application
        1. 10.2.2.1 Design Requirements
        2. 10.2.2.2 Detailed Design Procedure
        3. 10.2.2.3 Application Curves
      3. 10.2.3 2.1 Application
        1. 10.2.3.1 Design Requirements
        2. 10.2.3.2 Detailed Design Procedure
        3. 10.2.3.3 Application Curves
  11. 11Power Supply Recommendations
    1. 11.1 DVDD and AVDD Supplies
    2. 11.2 PVDD Power Supply
  12. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Examples
  13. 13Device and Documentation Support
    1. 13.1 Device Support
      1. 13.1.1 Third-Party Products Disclaimer
      2. 13.1.2 Development Support
    2. 13.2 Documentation Support
      1. 13.2.1 Related Documentation
    3. 13.3 Community Resources
    4. 13.4 Trademarks
    5. 13.5 Electrostatic Discharge Caution
    6. 13.6 Glossary
  14. 14Mechanical, Packaging, and Orderable Information

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7 Specifications

7.1 Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted) (1)
MIN MAX UNIT
Supply voltage DVDD, AVDD –0.3 4.2 V
PVDD_x –0.3 30 V
Input voltage 3.3-V digital input –0.5 DVDD + 0.5 V
5-V tolerant(2) digital input (except MCLK) –0.5 DVDD + 2.5(4)
5-V tolerant MCLK input –0.5 AVDD + 2.5(4)
OUT_x to PGND_x 32(3) V
BST_x to PGND_x 39(3) V
Input clamp current, IIK –20 20 mA
Output clamp current, IOK –20 20 mA
Operating free-air temperature 0 85 °C
Operating junction temperature 0 150 °C
Storage temperature, Tstg –40 125 °C
(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions is not implied. Exposure to absolute-maximum conditions for extended periods may affect device reliability.
(2) 5-V tolerant inputs are PDN, RESET, SCLK, LRCLK, MCLK, SDIN, SDA, and SCL.
(3) DC voltage + peak ac waveform measured at the pin must be below the allowed limit for all conditions.
(4) Maximum pin voltage must not exceed 6 V.

7.2 ESD Ratings

VALUE UNIT
V(ESD) Electrostatic discharge Human body model (HBM), per ANSI/ESDA/JEDEC JS-001(1) ±1000 V
Charged-device model (CDM), per JEDEC specification JESD22-C101(2) ±250
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
(2) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.

7.3 Recommended Operating Conditions

MIN NOM MAX UNIT
Digital/analog supply voltage DVDD, AVDD 3 3.3 3.6 V
Half-bridge supply voltage PVDD_x 8 26.4(2) V
VIH High-level input voltage 5-V tolerant 2 V
VIL Low-level input voltage 5-V tolerant 0.8 V
TA Operating ambient temperature range 0 85 °C
TJ(1) Operating junction temperature range 0 125 °C
RL (PBTL) Load impedance Output filter: L = 15 μH, C = 680 nF 2 Ω
RL (BTL) Load impedance Output filter: L = 15 μH, C = 680 nF 4 Ω
RL (SE) Load impedance Output filter: L = 15 μH, C = 680 nF 2 Ω
LO Output-filter inductance Minimum output inductance under short-circuit condition 10 μH
(1) Continuous operation above the recommended junction temperature may result in reduced reliability and/or lifetime of the device.
(2) For operation at PVDD_x levels greater than 18 V, the modulation limit must be set to 93.8% through the control port register 0x10.

7.4 Thermal Information

THERMAL METRIC(1) TAS5731M UNIT
PHP (HTQFP)
48 PINS
RθJA Junction-to-ambient thermal resistance 27.9 °C/W
RθJC(top) Junction-to-case (top) thermal resistance 1.1 °C/W
RθJB Junction-to-board thermal resistance 13 °C/W
ψJT Junction-to-top characterization parameter 20.7 °C/W
ψJB Junction-to-board characterization parameter 0.3 °C/W
RθJC(bot) Junction-to-case (bottom) thermal resistance 6.7 °C/W
(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report, SPRA953.

7.5 PWM Operation at Recommended Operating Conditions

PARAMETER TEST CONDITIONS VALUE UNIT
Output PWM switch frequency 11.025/22.05/44.1-kHz data rate ±2% 352.8 kHz
48/24/12/8/16/32-kHz data rate ±2% 384

7.6 DC Electrical Characteristics

TA = 25°, PVDD_x = 18 V, DVDD = AVDD = 3.3 V, RL= 8 Ω, BTL AD mode, fS = 48 kHz (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
VOH High-level output voltage ADR/FAULT and SDA IOH = –4 mA
DVDD = 3 V		 2.4 V
VOL Low-level output voltage ADR/FAULT and SDA IOL = 4 mA
DVDD = 3 V		 0.5 V
IIL Low-level input current VI < VIL;
DVDD = AVDD = 3.6 V
 75 μA
IIH High-level input current VI > VIH;
DVDD = AVDD = 3.6 V
 75(3) μA
IDD 3.3-V supply current 3.3-V supply voltage (DVDD, AVDD) Normal mode 49 68 mA
Reset (RESET = low, PDN = high) 23 38
IPVDD Supply current No load (PVDD_x) Normal mode 32 50 mA
Reset (RESET = low, PDN = high) 4 8
rDS(on)(2) Drain-to-source resistance, LS TJ = 25°C, includes metallization resistance 80 mΩ
Drain-to-source resistance, HS TJ = 25°C, includes metallization resistance 80
I/O PROTECTION
Vuvp Undervoltage protection limit PVDD falling 6.4 V
Vuvp,hyst Undervoltage protection limit PVDD rising 7.1 V
OTE(1) Overtemperature error 150 °C
OTEHYST(1) Extra temperature drop required to recover from error 30 °C
IOC Overcurrent limit protection Output to output short in BTL mode 4.5 A
IOCT Overcurrent response time 150 ns
(1) Specified by design.
(2) This does not include bond-wire or pin resistance.
(3) IIH for the PBTL pin has a maximum limit of 200 µA due to an internal pulldown on the pin.

7.7 AC Electrical Characteristics (BTL, PBTL)

PVDD_x = 18 V, BTL AD mode, fS = 48 kHz, RL = 8 Ω, CBST = 10 nF, audio frequency = 1 kHz, AES17 filter,
fPWM = 384 kHz, TA = 25°C (unless otherwise noted). All performance is in accordance with recommended operating conditions (unless otherwise noted).
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
PO Power output per channel BTL mode, PVDD = 8 V, RL = 8 Ω, 7% THD 3.9 W
BTL mode, PVDD = 8 V, RL = 8 Ω,10% THD 4.2
BTL mode, PVDD = 12 V, RL = 8 Ω, 7% THD 8
BTL mode, PVDD = 12 V, RL = 8 Ω,10% THD 9.6
BTL mode, PVDD = 18 V, RL = 8 Ω, 7% THD 18.7
BTL mode, PVDD = 18 V, RL = 8 Ω, 10% THD 21.2
BTL mode, PVDD = 24 V, RL = 8 Ω, 7% THD 32.6
BTL mode, PVDD = 24 V, RL = 8 Ω, 10% THD 37.2
PBTL mode, PVDD = 12 V, RL = 4 Ω, 7% THD 16.5
PBTL mode, PVDD = 12 V, RL = 4 Ω, 10% THD 17.9
PBTL mode, PVDD = 18 V, RL = 4 Ω, 7% THD 37
PBTL mode, PVDD = 18 V, RL = 4 Ω, 10% THD 39.6
PBTL mode, PVDD = 24 V, RL = 4 Ω, 10% THD 66
PBTL mode, PVDD = 24 V, RL = 4 Ω, 10% THD 69.6
SE Mode, PVDD = 12 V, RL = 4 Ω, 7% THD 4.2
SE Mode, PVDD = 12 V, RL = 4 Ω, 10% THD 4.6
SE Mode, PVDD = 18 V, RL = 4 Ω, 7% THD 9.6
SE Mode, PVDD = 18 V, RL = 4 Ω, 10% THD 10.2
SE Mode, PVDD = 24 V, RL = 4 Ω, 7% THD 17.1
SE Mode, PVDD = 24 V, RL = 4 Ω, 10% THD 18.1
THD+N Total harmonic distortion + noise PVDD = 8 V, PO = 1 W 0.15%
PVDD = 12 V, PO = 1 W 0.03%
PVDD = 18 V, PO = 1 W 0.04%
PVDD = 24 V, PO = 1 W 0.1%
Vn Output integrated noise (rms) A-weighted 46 μV
Cross-talk PO = 0.25 W, f = 1 kHz (AD Mode) –67 dB
SNR Signal-to-noise ratio(1) A-weighted, f = 1 kHz, maximum power at THD
< 1%		 104 dB
(1) SNR is calculated relative to 0-dBFS input level.

7.8 Electrical Characteristics - PLL External Filter Components

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
External PLL filter capacitor C1 SMD 0603 X7R 47 nF
External PLL filter capacitor C2 SMD 0603 X7R 4.7 nF
External PLL filter resistor R SMD 0603, metal film 470 Ω

7.9 Electrical Characteristic - I2C Serial Control Port Operation

for I2C Interface signals over recommended operating conditions (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
CL Load capacitance for each bus line 400 pF

7.10 Timing Requirements - PLL Input Parameters

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
fMCLKI MCLK frequency 2.8224 24.576 MHz
MCLK duty cycle 40% 50% 60%
tr/tf(MCLK) Rise/fall time for MCLK 5 ns
LRCLK allowable drift before LRCLK reset 4 MCLKs

7.11 Timing Requirements - Serial Audio Ports Slave Mode

over recommended operating conditions (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
fSCLKIN Frequency, SCLK 32 × fS, 48 × fS, 64 × fS CL = 30 pF 1.024 12.288 MHz
tsu1 Setup time, LRCLK to SCLK rising edge 10 ns
th1 Hold time, LRCLK from SCLK rising edge 10 ns
tsu2 Setup time, SDIN to SCLK rising edge 10 ns
th2 Hold time, SDIN from SCLK rising edge 10 ns
LRCLK frequency 8 48 48 kHz
SCLK duty cycle 40% 50% 60%
LRCLK duty cycle 40% 50% 60%
SCLK rising edges between LRCLK rising edges 32 64 SCLK edges
t(edge) LRCLK clock edge with respect to the falling edge of SCLK –1/4 1/4 SCLK period
tr/tf Rise/fall time for SCLK/LRCLK 8 ns

7.12 Timing Requirements - I2C Serial Control Port Operation

for I2C Interface signals over recommended operating conditions (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN MAX UNIT
fSCL Frequency, SCL No wait states 400 kHz
tw(H) Pulse duration, SCL high 0.6 μs
tw(L) Pulse duration, SCL low 1.3 μs
tr Rise time, SCL and SDA 300 ns
tf Fall time, SCL and SDA 300 ns
tsu1 Setup time, SDA to SCL 100 ns
th1 Hold time, SCL to SDA 0 ns
t(buf) Bus free time between stop and start conditions 1.3 μs
tsu2 Setup time, SCL to start condition 0.6 μs
th2 Hold time, start condition to SCL 0.6 μs
tsu3 Setup time, SCL to stop condition 0.6 μs

7.13 Timing Requirements - Reset (RESET)

control signal parameters over recommended operating conditions (unless otherwise noted).
PARAMETER MIN TYP MAX UNIT
tw(RESET) Pulse duration, RESET active 100 μs
td(I2C_ready) Time to enable I2C 12 ms
TAS5731M t0026-04_los556.gifFigure 1. Slave-Mode Serial Data-Interface Timing
TAS5731M t0027-01.gifFigure 2. SCL and SDA Timing
TAS5731M t0028-01.gifFigure 3. Start and Stop Conditions Timing
TAS5731M t0421-01_los556.gif

NOTES:

On power up, it is recommended that the TAS5731M RESET be held LOW for at least 100 μs after DVDD has reached 3 V.
If RESET is asserted LOW while PDN is LOW, then RESET must continue to be held LOW for at least 100 μs after PDN is deasserted (HIGH).
Figure 4. Reset Timing

7.14 Typical Characteristics

7.14.1 Typical Characteristics, 2.1 SE Configuration, 4 Ω

TAS5731M C016_SEPVDDvPo8Vto24V4R8R.pngFigure 5. Output Power vs Supply Voltage (2.1 SE Mode)
With 2 × 4ω + 4ω Load on Typical 2 Layer PCB Device May Be Thermally Limited Above 20 V
TAS5731M C018_THDvPo1kHz18V4R8R.pngFigure 7. Total Harmonic Distortion + Noise vs Output Power (2.1 SE Mode)
TAS5731M C020_SETHDvFreq12V4R8R6R.pngFigure 9. Total Harmonic Distortion + Noise vs Frequency (2.1 SE Mode)
TAS5731M C022_SETHDvFreq24V4R8R6R.pngFigure 11. Total Harmonic Distortion + Noise vs Frequency (2.1 SE Mode)
TAS5731M C024_SEEffvPo12V18V24V2x4p8.pngFigure 13. Efficiency vs Total Output Power (2.1 SE Mode)
TAS5731M C026_SEXtalk12V2x4p4.pngFigure 15. Crosstalk vs Frequency (2.1 SE Mode)
TAS5731M C028_SEXtalk24V2x4p4.pngFigure 17. Crosstalk vs Frequency (2.1 SE Mode)
TAS5731M C017_SETHDvPo1kHz12V4R8R.pngFigure 6. Total Harmonic Distortion + Noise vs Output Power (2.1 SE Mode)
TAS5731M C019_SETHDvPo1kHz24V4R8R.pngFigure 8. Total Harmonic Distortion + Noise vs Output Power (2.1 SE Mode)
TAS5731M C021_SETHDvFreq18V4R8R6R.pngFigure 10. Total Harmonic Distortion + Noise vs Frequency (2.1 SE Mode)
TAS5731M C023_SEEffvPo12V18V24V2x8p8.pngFigure 12. Efficiency vs Total Output Power (2.1 SE Mode)
TAS5731M C025_SEXtalk12V2x8p8.pngFigure 14. Crosstalk vs Frequency (2.1 SE Mode)
TAS5731M C027_SEXtalk24V2x8p8.pngFigure 16. Crosstalk vs Frequency (2.1 SE Mode)

7.14.2 Typical Characteristics, 2.0 BTL Configuration, 8 Ω

TAS5731M C001_BTLPVDDvPo8Vto24V4R6R8R.pngFigure 18. Output Power vs Supply Voltage (2.0 BTL Mode)
With 4ω Load on Typical 2 Layer PCB Device May Be Thermally Limited Above 20 V
TAS5731M C003_BTLTHDvPo1kHz18V4R6R8R.pngFigure 20. Total Harmonic Distortion + Noise vs Output Power (2.0 BTL Mode)
TAS5731M C006_BTLTHDvFreq12V4R8R6R.pngFigure 22. Total Harmonic Distortion vs Frequency (2.0 BTL Mode)
TAS5731M C008_BTLTHDvFreq24V4R8R6R.pngFigure 24. Total Harmonic Distortion vs Frequency (2.0 BTL Mode)
TAS5731M C010_BTLXtalkvFreq12V1W8R.pngFigure 26. Crosstalk vs Frequency (2.0 BTL Mode)
TAS5731M C012_BTLXtalkvFreq12V1W4R.pngFigure 28. Crosstalk vs Frequency (2.0 BTL Mode)
TAS5731M C014_BTL8RThermalRating.pngFigure 30. Power vs Supply Voltage (2.0 BTL Mode)
TAS5731M C002_BTLTHDvPo1kHz12V4R6R8R.pngFigure 19. Total Harmonic Distortion + Noise vs Output Power (2.0 BTL Mode)
TAS5731M C004_BTLTHDvPo1kHz24V4R6R8R.pngFigure 21. Total Harmonic Distortion + Noise vs Output Power (2.0 BTL Mode)
TAS5731M C007_BTLTHDvFreq18V4R8R6R.pngFigure 23. Total Harmonic Distortion vs Frequency (2.0 BTL Mode)
TAS5731M C005_BTLEffvPo12V18V24V8R.pngFigure 25. Efficiency vs Output Power (2.0 BTL Mode)
TAS5731M C011_BTLXtalkvFreq24V1W8R.pngFigure 27. Crosstalk vs Frequency (2.0 BTL Mode)
TAS5731M C015_BTLXtalkvFreq24V1W4R.pngFigure 29. Crosstalk vs Frequency (2.0 BTL Mode)
TAS5731M C009_BTLPVDDvICN8Vto24V4R6R8R.pngFigure 31. Idle Channel Noise vs Supply Voltage (2.0 BTL Mode)

7.14.3 Typical Characteristics, PBTL Configuration, 8 Ω

TAS5731M C031_PBTLPVDDvPo8Vto24V4R6R8R.pngFigure 32. Output Power vs Supply Voltage (PBTL Mode)
With 2ω Load on Typical 2 Layer PCB, Device May Be Thermally Limited Above 20 V
TAS5731M C033_PBTLTHDvPo1kHz18V3R4R.pngFigure 34. Total Harmonic Distortion + Noise vs Output Power (PBTL Mode)
TAS5731M C037_PBTLTHDvFreq12V4R8R6R.pngFigure 36. Total Harmonic Distortion vs Frequency (PBTL Mode)
TAS5731M C041_PBTLTHDvFreq24V4R8R6R.pngFigure 38. Total Harmonic Distortion vs Frequency (PBTL Mode)
TAS5731M C034_PBTLEffvPo12V18V24V6R.pngFigure 40. Efficiency vs Output Power (PBTL Mode)
TAS5731M C036_PBTLPVDDvICN8Vto24V4R6R8R.pngFigure 42. Idle Channel Noise vs Supply Voltage (PBTL Mode)
TAS5731M C032_PBTLTHDvPo1kHz12V3R4R.pngFigure 33. Total Harmonic Distortion + Noise vs Output Power (PBTL Mode)
TAS5731M C029_PBTLTHDvPo1kHz24V3R4R.pngFigure 35. Total Harmonic Distortion + Noise vs Output Power (PBTL Mode)
TAS5731M C038_PBTLTHDvFreq18V4R8R6R.pngFigure 37. Total Harmonic Distortion vs Frequency (PBTL Mode)
TAS5731M C035_PBTLEffvPo12V18V24V4R.pngFigure 39. Efficiency vs Output Power (PBTL Mode)
TAS5731M C039_PBTL4RThermalRating.pngFigure 41. Power vs Supply Voltage (PBTL Mode)