IC, AMP, AUDIO, CLASS D, 36POWERSO

TDA7492P

Manufacturer Part NumberTDA7492P
DescriptionIC, AMP, AUDIO, CLASS D, 36POWERSO
ManufacturerSTMicroelectronics
TDA7492P datasheet
 

Specifications of TDA7492P

Amplifier ClassDNo. Of Channels2
Supply Voltage Range8V To 26VLoad Impedance8ohm
Operating Temperature Range0°C To +70°CAmplifier Case StylePowerSO
No. Of Pins36SvhcNo SVHC
Output Power25WThd + N0.1% @ 1W, 8ohm, VCC=20V
Rohs CompliantYesLead Free Status / RoHS StatusLead free / RoHS Compliant
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Features
25 W + 25 W continuous output power at
THD = 10% with V
= 20 V and R
CC
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
Table 1.
Device summary
Order code
Operating temp. range
TDA7492P
0° to 70° C
TDA7492P13TR
0° to 70° C
September 2009
25 W + 25 W dual BTL class-D audio amplifier
= 8 Ω
L
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.
Package
PowerSSO-36 EPD
PowerSSO-36 EPD
Doc ID 15068 Rev 3
TDA7492P
PowerSSO-36
with exposed pad down
Packaging
Tube
Tape and reel
www.st.com
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TDA7492P Summary of contents

  • Page 1

    ... C September 2009 dual BTL class-D audio amplifier = 8 Ω L 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. Package ...

  • Page 2

    ... Input resistance and capacitance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 6.4 Internal and external clocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 6.4.1 6.4.2 6.5 Output low-pass filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 6.6 Protection function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 6.7 Diagnostic output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 2/26 Master mode (internal clock Slave mode (external clock Doc ID 15068 Rev 3 TDA7492P ...

  • Page 3

    ... TDA7492P List of tables Table 1. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Table 2. Pin description list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Table 3. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Table 4. Thermal data Table 5. Electrical specifications Table 6. Mode settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Table 7. Gain settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Table 8. How to set up SYNCLK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Table 9. PowerSSO-36 EPD dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Table 10. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Doc ID 15068 Rev 3 ...

  • Page 4

    ... Frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Figure 16. Crosstalk vs frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Figure 17. FFT Figure 18. FFT - Figure 19. Test board (SZ-LAB-TDA7492P) layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Figure 20. Applications circuit for class-D amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Figure 21. Standby and mute circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Figure 22. Turn on/off sequence for minimizing speaker “pop” Figure 23. Device input circuit and frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Figure 24 ...

  • Page 5

    ... TDA7492P 1 Device block diagram Figure 1 shows the block diagram of one of the two identical channels of the TDA7492P. Figure 1. Internal block diagram (showing one channel only) Doc ID 15068 Rev 3 Device block diagram 5/26 ...

  • Page 6

    ... OUTPB PGNDB PGNDB PVCCB PVCCB OUTNB OUTNB OUTNA OUTNA PVCCA PVCCA PGNDA PGNDA OUTPA OUTPA PGND 6/ Exposed pad down Doc ID 15068 Rev 3 TDA7492P VSS SVCC VREF INNB INPB GAIN1 GAIN0 SVR DIAG SGND VDDS SYNCLK ROSC INNA INPA MUTE STBY VDDPW ...

  • Page 7

    ... TDA7492P 2.2 Pin list Table 2. Pin description list Number Name 1 SUB_GND 2,3 OUTPB 4,5 PGNDB 6,7 PVCCB 8,9 OUTNB 10,11 OUTNA 12,13 PVCCA 14,15 PGNDA 16,17 OUTPA 18 PGND 19 VDDPW 20 STBY 21 MUTE 22 INPA 23 INNA 24 ROSC 25 SYNCLK 26 VDDS 27 SGND 28 DIAG 29 SVR 30 GAIN0 31 GAIN1 ...

  • Page 8

    ... Parameter 2 Table 5 below are given for the conditions kΩ 100 nF kHz, G OSC Parameter Condition - - - Play mode Mute mode = 0 Ω Differential input Doc ID 15068 Rev 3 TDA7492P Value Unit 30 V -0 °C -40 to 150 °C -40 to 150 °C Min Typ Max Unit - ...

  • Page 9

    ... TDA7492P Table 5. Electrical specifications (continued) Symbol V Overvoltage protection threshold - OVP Undervoltage protection V UVP threshold R Power transistor on resistance dsON P Output power o P Output power o P Power dissipated by device D η Efficiency THD Total harmonic distortion G Closed-loop gain V ∆G Gain matching V CT Cross talk ...

  • Page 10

    ... Characterization curves 4 Characterization curves The following characterizations were made using the SZ-LAB-TDA7492P demo board. 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. Characterizations for 6 Ω loads with 18 V 4.1 Figure 3 ...

  • Page 11

    ... TDA7492P Figure 5. THD at 100 Hz vs output power Test conditions: Vcc = Ω, Rosc = 39 kΩ, Cosc = 100 nF 100 Hz dB, Tamb = 25r C Specification limit: Typical @THD = 10% Figure 6. THD frequency Test conditions: Vcc = Ω, Rosc = 39 kΩ, Cosc = 100 nF kHz dB Tamb = 25r C Specification limit: Typical: THD < ...

  • Page 12

    ... Frequency (Hz) +0 -10 FFT -20 (dB) -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 -130 -140 -150 20 50 100 200 500 Frequency (Hz) Doc ID 15068 Rev 3 TDA7492P 10k 20k 10k 20k 10k 20k ...

  • Page 13

    ... TDA7492P Characterizations for 8 Ω loads with 20 V 4.2 Figure 11. Output power vs supply voltage Test conditions: Vcc = Ω, Rosc = 39 kΩ, Cosc = 100 nF kHz dB, Tamb = 25r C Specification limit: Typical Ω @THD = 10 @THD = 1% Figure 12. THD at 1 kHz vs output power Test conditions: Vcc = Ω ...

  • Page 14

    ... THD (%) 2 1 0.5 0.2 0.1 0.05 0.02 0.01 0.005 100m 200m 500m 1 Output power (W) 0.5 0.2 THD (%) 0.1 0.05 0.02 0.01 0.005 20 50 100 200 500 Frequency (Hz Ampl (dB 100 200 500 Frequency (Hz) Doc ID 15068 Rev 3 TDA7492P 10k 20k 10k 20k 30k ...

  • Page 15

    ... TDA7492P Figure 16. Crosstalk vs frequency Test conditions: Vcc = Ω, Rosc = 39 kΩ, Cosc = 100 nF kHz dB Tamb = 25r C Specification limit: Typical: > kHz Figure 17. FFT 0 dB Test conditions: Vcc = Ω Rosc = 39 kΩ, Cosc = 100 nF kHz dB Tamb = 25r C Specification limit: Typical: > for the harmonic frequency Figure 18 ...

  • Page 16

    ... Characterization curves Figure 19. Test board (SZ-LAB-TDA7492P) layout 16/26 Doc ID 15068 Rev 3 TDA7492P ...

  • Page 17

    ... TDA7492P 5 Applications circuit Figure 20. Applications circuit for class-D amplifier Input settings for standby, mute and play: STBY : MUTE 3 3.3 V TDA7492P Class-D amplifier Input settings for gain: GAIN0 : GAIN1 Mode Standby 3.3 V Standby 3 Mute 3 3.3 V Play Doc ID 15068 Rev 3 Applications circuit ...

  • Page 18

    ... 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 ...

  • Page 19

    ... TDA7492P 6.2 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 Input resistance and capacitance The input impedance is set by an internal resistor kΩ (typical). An input capacitor (Ci) is required to couple the AC input signal ...

  • Page 20

    ... If two or more class-D amplifiers are used in the same system 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. As explained below, SYNCLK is an output in master mode and an input in slave mode ...

  • Page 21

    ... TDA7492P 6.5 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 necessary to choose the L-C component values depending on the loud speaker impedance. Some typical values, which give a cut-off frequency of 27 kHz, are ...

  • Page 22

    ... Applications information 6.6 Protection function 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 V 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 The TDA7492P comes in a 36-pin PowerSSO package with exposed pad down. Figure 28 shows the package outline and Figure 28. PowerSSO-36 EPD outline drawing Table 9 gives the dimensions. Doc ID 15068 Rev 3 Package mechanical data 23/26 ...

  • Page 24

    ... Doc ID 15068 Rev 3 TDA7492P Dimensions in inches Min Typ 0.085 - 0.096 0.085 - 0.093 0 - 0.004 0.007 - 0.014 0.009 - 0.013 0.398 - 0.413 0.291 - 0.299 - 0.020 - - 0.335 - - 0.091 - - - 0.004 0.398 - 0 ...

  • Page 25

    ... TDA7492P 8 Revision history Table 10. Document revision history Date 30-Sep-2008 11-May-2009 02-Sep-2009 Revision 1 Initial release. Updated supply operating range Changed beginning of Updated Table 5: Electrical specifications on page 8 V min/max and added new parameter V OS Updated Figure 20: Applications circuit for class-D amplifier on page 17 2 Inserted brackets in equation in Section 6 ...

  • Page 26

    ... Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco - Philippines - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America 26/26 Please Read Carefully: © 2009 STMicroelectronics - All rights reserved STMicroelectronics group of companies www.st.com Doc ID 15068 Rev 3 TDA7492P ...