TDA7491LP

TDA7491LP 2 x 5-watt dual BTL class-D audio amplifier Features ■ 5 W + 5 W continuous output power: RL = 8 Ω, THD = 10% at VCC = 9 V ■ 5 W + 5 W continuous output power: RL = 4 Ω, THD = 10% at VCC = 6.6 V ■ Wide range single supply operation (5 V - 14 V) ■ High efficiency (η = 90%) ■ Four selectable, fixed gain settings of nominally 20 dB, 26 dB, 30 dB and 32 dB ■ Differential inputs minimize common-mode noise ■ Filterless operation ■ No ‘pop’ at turn-on/off ■ Standby and mute features ■ Short-circuit protection ■ Thermal overload protection ■ Externally synchronizable PowerSSO-36 with exposed pad down Description The TDA7491LP is a dual BTL class-D audio amplifier with single power supply designed for LCD TVs and monitors. Thanks to the high efficiency and exposed-pad-down (EPD) package no separate heatsink is required. Furthermore, the filterless operation allows a reduction in the external component count. The TDA7491LP is pin-to-pin compatible with the TDA7491P and TDA7491HV. Table 1. Device summary Order code Operating temperature Package Packaging TDA7491LP -40 to 85 °C PowerSSO-36 EPD Tube TDA7491LP13TR -40 to 85 °C PowerSSO-36 EPD Tape and reel March 2011 Doc ID 13541 Rev 5 1/37 www.st.com 37 Contents TDA7491LP Contents 1 Device block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3 4 5 2.1 Pin out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.2 Pin list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 3.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 3.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 3.3 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Characterization curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.1 With 4-Ω load at VCC = 6.6 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.2 With 8-Ω load at VCC = 9 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Applications information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 5.1 Applications circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 5.2 Mode selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 5.3 Gain setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 5.4 Input resistance and capacitance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 5.5 Internal and external clocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 5.6 6 2/37 5.5.1 Master mode (internal clock) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 5.5.2 Slave mode (external clock) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Modulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 5.6.1 Reconstruction low-pass filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 5.6.2 Filterless modulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 5.7 Protection functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 5.8 Diagnostic output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 5.9 Heatsink requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 5.10 Test board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 Doc ID 13541 Rev 5 TDA7491LP 7 Contents Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 Doc ID 13541 Rev 5 3/37 List of tables TDA7491LP List of tables Table 1. Table 2. Table 3. Table 4. Table 5. Table 6. Table 7. Table 8. Table 9. Table 10. 4/37 Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Pin description list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Electrical specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Mode settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Gain settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 How to set up SYNCLK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 PowerSSO-36 EPD dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 Doc ID 13541 Rev 5 TDA7491LP List of figures List of figures Figure 1. Figure 2. Figure 3. Figure 4. Figure 5. Figure 6. Figure 7. Figure 8. Figure 9. Figure 10. Figure 11. Figure 12. Figure 13. Figure 14. Figure 15. Figure 16. Figure 17. Figure 18. Figure 19. Figure 20. Figure 21. Figure 22. Figure 23. Figure 24. Figure 25. Figure 26. Figure 27. Figure 28. Figure 29. Figure 30. Figure 31. Figure 32. Figure 33. Figure 34. Figure 35. Figure 36. Figure 37. Figure 38. Internal block diagram (one channel only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Pin connection (top view, PCB view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Output power vs. supply voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 THD vs. output power (1 kHz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 THD vs. output power (100 Hz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 THD vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Crosstalk vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 FFT (0 dB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 FFT (-60 dB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Power supply rejection ratio vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Power dissipation and efficiency vs. output power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Attenuation vs. voltage on pin MUTE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Current consumption vs. voltage on pin STBY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Attenuation vs. voltage on pin STBY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Output power vs. supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 THD vs. output power (1 kHz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 THD vs. output power (100 Hz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 THD vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Crosstalk vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 FFT (0 dB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 FFT (-60 dB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Power supply rejection ratio vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Power dissipation and efficiency vs. output power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Applications circuit for class-D amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Standby and mute circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Turn-on/off sequence for minimizing speaker “pop” . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Device input circuit and frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Master and slave connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Unipolar PWM output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Typical LC filter for an 8-Ω speaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Typical LC filter for a 4-Ω speaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Filterless application schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Behavior of pin DIAG for various protection conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Power derating curves for PCB used as heatsink . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Test board (TDA7491LP) layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 PowerSSO-36 EPD outline drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Doc ID 13541 Rev 5 5/37 Device block diagram 1 TDA7491LP Device block diagram Figure 1 shows the block diagram of one of the two identical channels of the TDA7491LP. Figure 1. 6/37 Internal block diagram (one channel only) Doc ID 13541 Rev 5 TDA7491LP Pin description 2 Pin description 2.1 Pin out Figure 2. Pin connection (top view, PCB view) SUB_GND 1 36 VSS OUTPB 2 35 SVCC OUTPB 3 34 VREF PGNDB 4 33 INNB PGNDB 5 32 INPB PVCCB 6 31 GAIN1 PVCCB 7 30 GAIN0 OUTNB 8 29 SVR OUTNB 9 28 DIAG OUTNA 10 27 SGND OUTNA 11 26 VDDS PVCCA 12 25 SYNCLK PVCCA 13 24 ROSC 23 INNA 22 INPA EP exposed pad down Connect to ground PGNDA 14 PGNDA 15 OUTPA 16 21 MUTE OUTPA 17 20 STBY PGND 18 19 VDDPW Doc ID 13541 Rev 5 7/37 Pin description 2.2 TDA7491LP Pin list Table 2. Pin description list Number 8/37 Name Type Description 1 SUB_GND POWER Connect to the frame 2,3 OUTPB OUT Positive PWM output for right channel 4,5 PGNDB POWER Power stage ground for right channel 6,7 PVCCB POWER Power supply for right channel 8,9 OUTNB OUT Negative PWM output for right channel 10,11 OUTNA OUT Negative PWM output for left channel 12,13 PVCCA POWER Power supply for left channel 14,15 PGNDA POWER Power stage ground for left channel 16,17 OUTPA OUT Positive PWM output for left channel 18 PGND POWER Power stage ground 19 VDDPW OUT 3.3-V (nominal) regulator output referred to ground for power stage 20 STBY INPUT Standby mode control 21 MUTE INPUT Mute mode control 22 INPA INPUT Positive differential input of left channel 23 INNA INPUT Negative differential input of left channel 24 ROSC OUT Master oscillator frequency-setting pin 25 SYNCLCK IN/OUT Clock in/out for external oscillator 26 VDDS OUT 3.3-V (nominal) regulator output referred to ground for signal blocks 27 SGND POWER Signal ground 28 DIAG OUT Open-drain diagnostic output 29 SVR OUT Supply voltage rejection 30 GAIN0 INPUT Gain setting input 1 31 GAIN1 INPUT Gain setting input 2 32 INPB INPUT Positive differential input of right channel 33 INNB INPUT Negative differential input of right channel 34 VREF OUT Half VDDS (nominal) referred to ground 35 SVCC POWER Signal power supply 36 VSS OUT 3.3-V (nominal) regulator output referred to power supply - EP - Exposed pad for ground-plane heatsink, to be connected to GND Doc ID 13541 Rev 5 TDA7491LP Electrical specifications 3 Electrical specifications 3.1 Absolute maximum ratings Table 3. Absolute maximum ratings Symbol 3.2 Parameter Value Unit VCC DC supply voltage 18 V VI Voltage limits for input pins STBY, MUTE, INNA, INPA, INNB, INPB, GAIN0, GAIN1 -0.3 to 3.6 V Top Operating temperature -40 to 85 °C Tj Operating junction temperature -40 to 150 °C Tstg Storage temperature -40 to 150 °C Thermal data Refer also to Section 5.9: Heatsink requirements on page 32. Table 4. Thermal data Symbol Parameter Min Typ Max Rth j-case Thermal resistance, junction to case - 2 3 Rth j-amb Thermal resistance, junction to ambient - 24 - Unit °C/W Doc ID 13541 Rev 5 9/37 Electrical specifications 3.3 TDA7491LP Electrical specifications Unless otherwise stated, the results in Table 5 below are given for the conditions: VCC = 9 V, RL (load) = 8Ω, ROSC = R3 = 39 kΩ, C8 = 100 nF, f = 1 kHz, GV = 20 dB, and Tamb = 25 °C. Table 5. Electrical specifications Symbol Condition Min Typ Max Unit VCC Supply voltage - 5 - 14 V Iq Total quiescent current Without LC filter - 26 35 mA IqSTBY Quiescent current in standby - - - 10 µA Play mode -100 - 100 mV VOS Output offset voltage Mute mode -60 - 60 mV IOCP Overcurrent protection threshold RL = 0 Ω 3 - - A Tj Junction temperature at thermal shutdown - - 150 - °C Ri Input resistance Differential input 54 68 - kΩ VUVP Undervoltage protection threshold - - - 4.5 V High side - 0.2 - RdsON Power transistor on resistance Low side - 0.2 - THD = 10% - 5.0 - Po Output power THD = 1% - 4.0 - RL = 4 Ω, THD = 10%, VCC = 6.6 V - 5.0 - RL = 4 Ω, THD = 1%, VCC = 6.6 V - 4.0 - Po Ω W Output power W PD Dissipated power Po = 5 W + 5 W, THD = 10% - 1.0 - W η Efficiency Po = 5 W + 5 W, RL = 8 Ω, THD = 10%, VCC = 9 V - 90 - % THD Total harmonic distortion Po = 1 W - 0.1 - % GAIN0 = L, GAIN1 = L 18 20 22 GAIN0 = L, GAIN1 = H 24 26 28 GAIN0 = H, GAIN1 = L 28 30 32 GAIN0 = H, GAIN1 = H 30 32 34 GV 10/37 Parameter Closed loop gain dB ΔGV Gain matching - -1 - 1 dB CT Crosstalk f = 1 kHz, Po = 1 W - 70 - dB 15 - Total input noise A Curve, GV = 20 dB - eN f = 22 Hz to 22 kHz - 20 - Doc ID 13541 Rev 5 µV TDA7491LP Electrical specifications Table 5. Symbol Electrical specifications (continued) Parameter Condition Min Typ Max Unit SVRR Supply voltage rejection ratio fr = 100 Hz, Vr = 1 Vpp, CSVR = 10 µF - 50 - dB Tr, Tf Rise and fall times - - 40 - ns fSW Switching frequency Internal oscillator, master mode 290 320 350 kHz fSWR Switching frequency range (1) 250 - 400 kHz VinH Digital input high (H) 2.3 - - VinL Digital input low (L) - - 0.8 AMUTE Mute attenuation - 80 - VMUTE = low, VSTBY = high Function Standby, mute and play modes mode V dB VSTBY < 0.5 V VMUTE = X Standby - VSTBY > 2.9 V VMUTE < 0.8 V Mute - VSTBY > 2.9 V VMUTE > 2.9 V Play - 1. Refer to Section 5.5: Internal and external clocks on page 27. Doc ID 13541 Rev 5 11/37 Characterization curves 4 TDA7491LP Characterization curves The following characterization curves were made using the TDA7491LP demo board. The LC filter for the 4-Ω load uses components of 15 µH and 470 nF and that for the 8-Ω load uses 33 µH and 220 nF. 4.1 With 4-Ω load at VCC = 6.6 V Figure 3. Output power vs. supply voltage 6 Test Condition : Vcc = 5~6.6V 5 THD =10% 4 THD =1% RL = 4 ohm, Po ( W ) Rosc =39kΩ, Cosc =100nF, f =1kHz, Gv =30dB, Tamb =25°C 3 2 Specification Limit: Typical: Vs =6.6V, Rl = 4 ohm Po =5W @THD =10% Po =3.7W @THD =1% 1 0 5 5. 4 5. 8 6. 2 Supply voltage (V) Figure 4. THD vs. output power (1 kHz) THD(%) Test Condition: Vcc =6.6V, RL= 4 ohm, Rosc =39kΩ, Cosc =100nF, f =1kHz, Gv =30dB, Tamb =25°C Specification Limit: Typical: Po =5W @ THD =10% Po per Channel (W) 12/37 Doc ID 13541 Rev 5 6. 6 TDA7491LP Characterization curves Figure 5. THD vs. output power (100 Hz) THD(%) Test Condition: Vcc =6.6V, RL= 4 ohm, Rosc =39kΩ, Cosc =100nF, f =100Hz, Gv =30dB, Tamb =25°C Specification Limit: Typical: Po =5W @ THD =10% Po per Channel (W) Figure 6. THD vs. frequency THD(%) Test Condition: Vcc =6.6V, RL= 4 ohm, Rosc =39kΩ, Cosc =100nF, f =1kHz, Gv =30dB, Po =1W Tamb =25°C Specification Limit: Typical: THD50dB (@ f =1kHz) Frequency (Hz) 14/37 Doc ID 13541 Rev 5 TDA7491LP Characterization curves Figure 9. FFT (0 dB) FFT (dB) FFT (0 dB) Test Condition: Vcc =6.6V, RL= 4 ohm, Rosc =39kΩ, Cosc =100nF, f = 1kHz, Gv =30dB, Po =1W Tamb =25°C Specification Limit: Typical: >60dB for the harmonic frequency Frequency (Hz) Figure 10. FFT (-60 dB) FFT (dB) FFT (-60 dB) Test Condition: Vcc =6.6V, RL= 4 ohm, Rosc =39kΩ, Cosc =100nF, f =1kHz, Gv =30dB, Po = -60dB (@ 1W =0dB) Tamb =25°C Specification Limit: Typical: > 90dB for the harmonic frequency Frequency (Hz) Doc ID 13541 Rev 5 15/37 Characterization curves TDA7491LP Figure 11. Power supply rejection ratio vs. frequency PSRR (dB) Test Condition : Vcc = 6.6V, RL = 4 ohm, Rosc =39kΩ, Cosc =100nF, Vin=0, Gv =30dB, Tamb =25°C Vr = 500mVrms Fr = 100Hz Frequency (Hz) Figure 12. Power dissipation and efficiency vs. output power Test Condition : 90 2 80 1. 8 Vcc = 6.6V, 1. 6 70 Gv =30dB, Tamb =25°C Efficiency (%) Rosc =39kΩ, Cosc =100nF, 1. 4 60 1. 2 50 1 40 0. 8 30 0. 6 20 0. 4 10 0. 2 0 0 0 1 2 3 Po per channel (W) 16/37 Doc ID 13541 Rev 5 4 5 Pd (W) RL = 4 ohm, TDA7491LP Characterization curves Figure 13. Attenuation vs. voltage on pin MUTE Test Condition : RL = 4 ohm, Rosc =39kΩ, Cosc =100nF, f=1kHz, 0dB@f=1kHz, Po=1w, Gv =30dB, Tamb =25°C Attenuation (dB) Vcc = 6.6V, 5 0 -5 - 10 - 15 - 20 - 25 - 30 - 35 - 40 - 45 - 50 - 55 - 60 - 65 - 70 - 75 - 80 0 0. 5 1 1. 5 Vmute (V) 2 2. 5 3 3. 5 3 3. 5 Figure 14. Current consumption vs. voltage on pin STBY 0. 025 Test Condition : Vcc = 6.6V, 0. 02 RL = 4 ohm, Rosc =39kΩ, Cosc =100nF, Gv =30dB, Tamb =25°C Iq (A) Vin=0, 0. 015 0. 01 0. 005 0 0 0. 5 1 1. 5 2 2. 5 Vstby (V) Doc ID 13541 Rev 5 17/37 Characterization curves TDA7491LP Figure 15. Attenuation vs. voltage on pin STBY 10 0 Test Condition : RL = 4 ohm, Rosc =39kΩ, Cosc =100nF, f=1kHz, 0dB@f=1kHz, Po=1w, Gv =30dB, Tamb =25°C Attenuation (dB) Vcc = 6.6V, - 10 - 20 - 30 - 40 - 50 - 60 - 70 - 80 - 90 0 18/37 0. 5 1 Doc ID 13541 Rev 5 1. 5 2 Vstby (V) 2. 5 3 3. 5 TDA7491LP With 8-Ω load at VCC = 9 V Figure 16. Output power vs. supply voltage Test Condition : Vcc = 5~9V, RL = 8 ohm, Rosc =39kΩ, Cosc =100nF, f =1kHz, Gv =30dB, Tamb =25°C Specification Limit: Typical: Vs =9V,Rl = 8 ohm Output power (W) 4.2 Characterization curves Po =5W @THD =10% Po =4W @THD =1% 6 5. 5 5 4. 5 4 3. 5 3 2. 5 2 1. 5 1 0. 5 0 THD =10% Rl =8 ohm f =1kHz THD =1% 5 6 7 8 9 Supply voltage (V) Figure 17. THD vs. output power (1 kHz) THD (%) 10 Test Condition: 5 Vcc =9V, RL= 8 ohm, 2 Rosc =39kΩ, Cosc =100nF, 1 f =1kHz, 0.5 Gv =30dB, Tamb =25°C 0.2 0.1 Specification Limit: 0.05 Typical: Po =5W @ THD =10% 0.02 0.01 100m 200m 300m 400m 600m 800m 1 2 3 4 5 6 Output Power (W) Doc ID 13541 Rev 5 19/37 Characterization curves TDA7491LP Figure 18. THD vs. output power (100 Hz) THD (%) 10 Test Condition: Vcc =9V, 5 2 RL= 8 ohm, Rosc =39kΩ, Cosc =100nF, f =100Hz, Gv =30dB, 1 0.5 0.2 Tamb =25°C 0.1 Specification Limit: Typical: Po =5W @ THD =10% 0.05 0.02 0.01 0.005 100m 200m 300m 400m 600m 800m 1 2 3 4 5 6 Output Power (W) Figure 19. THD vs. frequency THD (%) 1 Test Condition: Vcc =9V, 0.5 RL= 8 ohm, Rosc =39kΩ, Cosc =100nF, 0.2 f =1kHz, 0.1 Gv =30dB, Po =1W 0.05 Tamb =25°C 0.02 Specification Limit: 0.01 Typical: THD50dB (@ f =1kHz) -115 -120 20 50 100 200 500 1k 2k 5k 10k 20k Frequency (Hz) Doc ID 13541 Rev 5 21/37 Characterization curves TDA7491LP Figure 22. FFT (0 dB) FFT (0 dB) FFT (dB) +10 +0 Test Condition: -10 Vcc =9V, -20 RL= 8 ohm, -30 Rosc =39kΩ, Cosc =100nF, -40 -50 f = 1kHz, Gv =30dB, Po =1W Tamb =25°C -60 -70 -80 -90 -100 -110 Specification Limit: Typical: >60dB for the harmonic frequency -120 -130 -140 -150 20 50 100 200 500 1k 2k 5k 10k 20k 2k 5k 10k 20k Frequency (Hz) Figure 23. FFT (-60 dB) FFT (dB) FFT (-60 dB) +0 Test Condition: -10 Vcc =9V, -20 RL= 8 ohm, -30 Rosc =39kΩ, Cosc =100nF, -40 f =1kHz, -50 -60 Gv =30dB, Po = -60dB (@ 1W =0dB) Tamb =25°C -70 -80 -90 -100 Specification Limit: -110 Typical: > 90dB -120 for the harmonic frequency -130 -140 -150 20 50 100 200 500 1k Frequency (Hz) 22/37 Doc ID 13541 Rev 5 TDA7491LP Characterization curves Figure 24. Power supply rejection ratio vs. frequency Test Condition : Vcc = 9V, RL = 8 ohm, Rosc =39kΩ, Cosc =100nF, Ripple frequency=100Hz Vin=0, Ripple voltage=500mV Gv =30dB, Tamb =25°C Figure 25. Power dissipation and efficiency vs. output power 90 Vcc = 9V, 80 Rosc =39kΩ, Cosc =100nF, Vin=0, Gv =30dB, Tamb =25°C Efficiency (%) RL = 8 ohm, 2. 5 2 70 60 1. 5 50 40 1 Vcc=9V 30 Rload=8ohm 20 Gain=30dB 10 f=1kHz 0. 5 Power dissipation (W) Test Condition : 0 0 0 1 2 3 4 5 Output power per channel (W) Doc ID 13541 Rev 5 23/37 Applications information TDA7491LP 5 Applications information 5.1 Applications circuit Figure 26. Applications circuit for class-D amplifier   & Q) & Q) 6*1' & Q) & Q) 6*1' & Q)  68%B*1' 2873$  / ,13$ 2873$  X+ ,11$ - & Q) ',$* ',$* 39&&$   6