Datasheet

ManualsBrandsSTMICROELECTRONICS ManualsLinear ICsLinear IC - Audio amplifier 2-channel (stereo) Class D PowerSSO 36 EPD

September 2011 Doc ID 15068 Rev 5 1/26

TDA7492P

25-watt + 25-watt dual BTL class-D audio amplifier

Features

■ 25 W + 25 W continuous output power at

THD = 10% with V

= 20 V and R

= 8 Ω

■ Wide-range single-supply operation (8 - 26 V)

■ High efficiency (η = 90%)

■ Four selectable, fixed gain settings of

nominally 21.6 dB, 27.6 dB, 31.1 dB and

33.6 dB

■ Differential inputs minimize common-mode

noise

■ Standby and mute features

■ Short-circuit protection

■ Thermal overload protection

■ Externally synchronizable

■ ECOPACK

, environmentally-friendly package

Description

The TDA7492P 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 heatsink is required.

PowerSSO-36

with exposed pad down

Table 1. Device summary

Order code Operating temp. range Package Packaging

TDA7492P -40 to 85 °C PowerSSO-36 EPD Tube

TDA7492P13TR -40 to 85 °C PowerSSO-36 EPD Tape and reel

www.st.com

Summary of content (26 pages)

PAGE 1
TDA7492P 25-watt + 25-watt dual BTL class-D audio amplifier Features ■ 25 W + 25 W continuous output power at THD = 10% with VCC = 20 V and RL = 8 Ω ■ Wide-range single-supply operation (8 - 26 V) ■ High efficiency (η = 90%) ■ Four selectable, fixed gain settings of nominally 21.6 dB, 27.6 dB, 31.1 dB and 33.
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Contents TDA7492P Contents 1 Device block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3 4 2.1 Pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.2 Pin list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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TDA7492P List of tables List of tables Table 1. Table 2. Table 3. Table 4. Table 5. Table 6. Table 7. Table 8. Table 9. Table 10. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Pin description list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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List of figures TDA7492P 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. 4/26 Internal block diagram (showing one channel only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Pin connections (top view, PCB view) . . . . . .
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TDA7492P 1 Device block diagram Device block diagram Figure 1 shows the block diagram of one of the two identical channels of the TDA7492P. Figure 1.
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Pin description TDA7492P 2 Pin description 2.1 Pinout Figure 2.
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TDA7492P 2.2 Pin description Pin list Table 2.
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Electrical specifications TDA7492P 3 Electrical specifications 3.1 Absolute maximum ratings Table 3. Absolute maximum ratings Symbol 3.2 Parameter Value Unit VCCMAX DC supply voltage for pins PVCCA, PVCCB, SVCC 30 V VI Voltage limits for input pins STANDBY, MUTE, INNA, INPA, INNB, INPB, GAIN0, GAIN1 -0.3 to 3.6 V Top Operating temperature -40 to 85 °C Tj Junction temperature -40 to 150 °C Tstg Storage temperature -40 to 150 °C Thermal data Table 4.
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TDA7492P Electrical specifications Table 5. Electrical specifications (continued) Symbol Parameter Condition Min Typ Max Unit VOVP Overvoltage protection threshold - 28 29 - V VUVP Undervoltage protection threshold - - - 7 V High side - 0.2 - RdsON Power transistor on resistance Low side - 0.2 - THD = 10% - 25 - Po Output power THD = 1% - 20 - 9.5 - Output power VCC = 12 V, THD = 10% - Po VCC = 12 V, THD = 1% - 7.
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Characterization curves 4 TDA7492P Characterization curves The following characterizations were made using the SZ-LAB-TDA7492P demo board. The layout is shown in Figure 19 on page 16. The LC filter for the 6 Ω load used 22 µH and 220 nF components, whilst that for the 8 Ω load used 33 µH and 220 nF. 4.1 Characterizations for 6 Ω loads with 18 V Figure 3. Output power vs.
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TDA7492P Characterization curves Figure 5. THD at 100 Hz vs. output power 10 Test conditions: Vcc = 18 V, 5 THD (%) RL = 6 Ω, 2 Rosc = 39 kΩ, Cosc = 100 nF, 1 f = 100 Hz, 0.5 Gv = 30 dB, Tamb = 25r C 0.2 0.1 0.05 Specification limit: 0.02 Typical: 0.01 Po = 25 W @THD = 10% 0.005 200m 500m 1 2 5 10 2k 5k 20 30 2XWSXW SRZHU : Figure 6. THD at 1 W vs. frequency 0.5 Test conditions: Vcc = 18 V, THD (%) RL = 6 Ω, 0.2 Rosc = 39 kΩ, Cosc = 100 nF, f = 1 kHz, 0.
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Characterization curves Figure 8. TDA7492P Crosstalk vs frequency -60 Test conditions: -65 Vcc = 18 V, Crosstalk RL = 6 Ω, (dB) -70 -75 Rosc = 39 kΩ, Cosc = 100 nF, f = 1 kHz, -80 Gv = 30 dB, -85 Po = 1 W -90 Tamb = 25r C -95 -100 -105 Specification limit: -110 Typical: -115 > 50 dB @f = 1 kHz -120 20 50 100 200 500 1k 2k 5k 10k 20k Frequency (Hz) Figure 9.
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TDA7492P Characterizations for 8 Ω loads with 20 V Figure 11. Output power vs supply voltage 28 Test conditions: 26 Vcc = 8 to 20 V, 24 RL = 8 Ω, Rosc = 39 kΩ, Cosc = 100 nF, f = 1 kHz, Gv = 30 dB, Tamb = 25r C Output power (W) 4.2 Characterization curves 22 20 THD = 10% 18 16 14 12 THD = 1% 10 Specification limit: 8 Typical: 6 Vs = 20 V, RL = 8 Ω 4 Po = 25 W @THD = 10% 2 8 Po = 20 W @THD = 1% 9 10 11 12 13 14 15 16 17 18 19 20 Supply voltage (V) Figure 12.
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Characterization curves TDA7492P Figure 13. THD at 100 Hz vs output power 10 Test conditions: Vcc = 20 V, 5 THD (%) RL = 8 Ω, 2 Rosc = 39 kΩ, Cosc = 100 nF, 1 f = 100 Hz, 0.5 Gv = 30 dB, Tamb = 25r C 0.2 0.1 0.05 Specification limit: 0.02 Typical: 0.01 Po = 25 W @THD = 10% 0.005 100m 200m 500m 1 2 5 10 20 30 Output power (W) Figure 14. THD at 1 W vs frequency 0.5 Test conditions: Vcc = 20 V, RL = 8 Ω, Rosc = 39 kΩ, Cosc = 100 nF, 0.2 THD (%) f = 1 kHz, 0.
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TDA7492P Characterization curves Figure 16. Crosstalk vs frequency -60 Test conditions: TTTTTTTTTTT TTTT T TTTTT -65 Vcc = 20 V, Crosstalk RL = 8 Ω, (dB) -70 -75 Rosc = 39 kΩ, Cosc = 100 nF, f = 1 kHz, -80 Gv = 30 dB, -85 Po = 1 W -90 Tamb = 25r C -95 -100 -105 Specification limit: -110 Typical: -115 > 50 dB @f = 1 kHz -120 20 50 100 200 500 1k 2k 5k 10k 20k 2k 5k 10k 20k 5k 10k 20k Frequency (Hz) Figure 17.
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Characterization curves TDA7492P 2. Test Board Figure 19.
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Applications circuit TDA7492P 5 Figure 20. Applications circuit for class-D amplifier & Q) & Q) 6*1' & Q) & Q) 6*1' Jumper settings for gain: Q) 0V:0V 0 V : 3.3 V Doc ID 15068 Rev 5 31.1 dB 3.3 V : 3.3 V 33.
PAGE 18
Applications information TDA7492P 6 Applications information 6.1 Mode selection The three operating modes of the TDA7492P are set by the two inputs STBY (pin 20) and MUTE (pin 21). ● Standby mode: all circuits are turned off, very low current consumption. ● Mute mode: inputs are connected to ground and the positive and negative PWM outputs are at 50% duty cycle. ● Play mode: the amplifiers are active.
PAGE 19
TDA7492P 6.2 Applications information Gain setting The gain of the TDA7492P is set by the two inputs, GAIN0 (pin 30) and GAIN1 (pin31). Internally, the gain is set by changing the feedback resistors of the amplifier. Table 7. Gain settings GAIN0 6.3 GAIN1 Nominal gain, Gv (dB) 0 0 21.6 0 1 27.6 1 0 31.1 1 1 33.6 Input resistance and capacitance The input impedance is set by an internal resistor Ri = 60 kΩ (typical). An input capacitor (Ci) is required to couple the AC input signal.
PAGE 20
Applications information 6.4 TDA7492P Internal and external clocks The clock of the class-D amplifier can be generated internally or can be driven by an external source. If two or more class-D amplifiers are used in the same system, it is recommended that all devices operate at the same clock frequency. This can be implemented by using one TDA7492P as master clock, while the other devices are in slave mode (that is, externally clocked. The clock interconnect is via pin SYNCLK of each device.
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TDA7492P 6.5 Applications information Output low-pass filter To avoid EMI problems, it may be necessary to use a low-pass filter before the speaker. The cutoff frequency should be larger than 22 kHz and much lower than the output switching frequency. It is necessary to choose the L-C component values depending on the loud speaker impedance. Some typical values, which give a cutoff frequency of 27 kHz, are shown in Figure 25 and Figure 26 below. Figure 25. Typical LC filter for a 8-Ω speaker Figure 26.
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Applications information 6.6 TDA7492P Protection functions The TDA7492P is fully protected against overvoltages, undervoltages, overcurrents and thermal overloads as explained here. Overvoltage protection (OVP) If the supply voltage exceeds the value for VOVP given in Table 5: Electrical specifications on page 8 the overvoltage protection is activated which forces the outputs to the high-impedance state. When the supply voltage drops to below the threshold value the device restarts.
PAGE 23
TDA7492P 7 Package mechanical data Package mechanical data The TDA7492P comes in a 36-pin PowerSSO package with exposed pad down. Figure 28 below shows the package outline and Table 9 gives the dimensions. Table 9. PowerSSO-36 EPD dimensions Dimensions in mm Dimensions in inches Symbol Min Typ Max Min Typ Max A 2.15 - 2.45 0.085 - 0.096 A2 2.15 - 2.35 0.085 - 0.093 a1 0 - 0.10 0 - 0.004 b 0.18 - 0.36 0.007 - 0.014 c 0.23 - 0.32 0.009 - 0.013 D 10.10 - 10.
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h x 45° Package mechanical data 24/26 Figure 28.
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TDA7492P 8 Revision history Revision history Table 10. Document revision history Date Revision Changes 30-Sep-2008 1 Initial release. 11-May-2009 2 Updated supply operating range to 8 V - 26 V on page 1 Changed C1 to C8 at beginning of Section 3.
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TDA7492P Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale.