TDA7492 STMicroelectronics, TDA7492 Datasheet
TDA7492
Specifications of TDA7492
Available stocks
Related parts for TDA7492
TDA7492 Summary of contents
Page 1
... September 2009 dual BTL class-D audio amplifier = Description The TDA7492 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-up (EPU) package only a simple heatsink is required. Package PowerSSO-36 EPU ...
Page 2
... Input resistance and capacitance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 6.4 Internal and external clocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 6.4.1 6.4.2 6.5 Output low-pass filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 6.6 Protection function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 6.7 Diagnostic output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 6.8 Heatsink requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 2/32 Master mode (internal clock Slave mode (external clock Doc ID 14926 Rev 4 TDA7492 ...
Page 3
... TDA7492 8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Doc ID 14926 Rev 4 Contents 3/32 ...
Page 4
... List of tables Table 1. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Table 2. Pin description list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Table 3. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Table 4. Thermal data Table 5. Electrical specifications Table 6. Mode settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Table 7. Gain settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Table 8. How to set up SYNCLK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Table 9. PowerSSO-36 EPU dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Table 10. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 4/32 Doc ID 14926 Rev 4 TDA7492 ...
Page 5
... TDA7492 List of figures Figure 1. Internal block diagram (showing one channel only Figure 2. Pin connection (top view, PCB view Figure 3. Output power vs. supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Figure 4. THD vs. output power (1 kHz Figure 5. THD vs. output power (100 Hz Figure 6. THD vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Figure 7. Frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Figure 8. Crosstalk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Figure 9 ...
Page 6
... Device block diagram 1 Device block diagram Figure 1 shows the block diagram of one of the two identical channels of the TDA7492. Figure 1. Internal block diagram (showing one channel only) 6/32 Doc ID 14926 Rev 4 TDA7492 ...
Page 7
... TDA7492 2 Pin description 2.1 Pin-out Figure 2. Pin connection (top view, PCB view) 36 VSS 35 SVCC 34 VREF 33 INNB 32 INPB 31 GAIN1 30 GAIN0 29 SVR 28 DIAG 27 SGND 26 VDDS 25 SYNCLK 24 ROSC 23 INNA 22 INPA EP exposed pad up 21 MUTE Connect to ground 20 STBY 19 VDDPW Doc ID 14926 Rev 4 Pin description SUB GND ...
Page 8
... Gain setting input 2 I Positive differential input of right channel I Negative differential input of right channel O Half VDDS (nominal) referred to ground PWR Signal power supply O 3.3-V (nominal) regulator output referred to power supply - Exposed pad for heatsink connected to GND Doc ID 14926 Rev 4 TDA7492 Description ...
Page 9
... TDA7492 3 Electrical specifications 3.1 Absolute maximum ratings Table 3. Absolute maximum ratings Symbol V DC supply voltage for pins PVCCA, PVCCB, SVCC CC Voltage limits for input pins STBY, MUTE, INNA, INPA INNB, INPB, GAIN0, GAIN1 T Operating temperature op T Junction temperature j T Storage temperature stg 3 ...
Page 10
... Doc ID 14926 Rev 4 Min Typ - - 0.1 0.4 20.6 21.6 22.6 26.6 27.6 28.6 30.1 31.1 32.1 32.6 33.6 34 ± 290 310 330 (1) 250 - 400 (2) 250 - 400 2 0 with kΩ (see Figure 28.). TDA7492 Max Unit V Ω µ kHz kHz V dB ...
Page 11
... TDA7492 4 Characterization curves The general test conditions used for producing the characterization curves can be summarized as follows: Test board: SZ LAB TDA7492 slug-up demo board Test frequency: 1 kHz (also 100 Hz for THD vs. output power only) Output power For 6-Ω loads – test voltage – ...
Page 12
... Rosc = 39 kΩ, Cosc = 100 nF 100 Hz dB, Tamb = 25r C Specification limit: Typical THD = 10% 12/ THD % 2 1 0.5 0.2 0.1 0.05 0.02 0.01 100m 200m 500m THD % 2 1 0.5 0.2 0.1 0.05 0.02 0.01 100m 200m 500m 1 Doc ID 14926 Rev 4 TDA7492 Output Power ( Output power (W) ...
Page 13
... TDA7492 Figure 6. THD vs. frequency Test conditions: Vcc = Ω, Rosc = 39 kΩ, Cosc = 100 nF kHz dB Tamb = 25r C Specification limit: Typical: THD < 0.4% Figure 7. Frequency response Test conditions: Vcc = Ω, Rosc = 39 kΩ, Cosc = 100 nF kHz dB Tamb = 25r C Specification limit: Max: +/- kHz) Figure 8 ...
Page 14
... Doc ID 14926 Rev 4 TDA7492 500 10k 20k Frequency (Hz) 500 10k 20k Frequency (Hz) ...
Page 15
... TDA7492 4.2 Characterizations for 8-Ω loads 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 vs. output power (1 kHz) Test conditions: Vcc = Ω, Rosc = 39 kΩ, Cosc = 100 nF, ...
Page 16
... THD 0.2 % 0.1 0.07 0.06 0.05 0.04 0.03 0.02 0. 100 200 +1 +0.5 -0 dBrA -0.5 -1 -1.5 -2 -2.5 -3 -3.5 -4 -4 100 200 Frequency (Hz) Doc ID 14926 Rev 4 TDA7492 Output power (W) 500 10k 20k Frequency (Hz) 500 10k 20k ...
Page 17
... TDA7492 Figure 16. Crosstalk Test conditions: Vcc = Ω, Rosc = 39 kΩ, Cosc = 100 nF kHz dB Tamb = 25r C Specification limit: Typical: > ( kHz) Figure 17. FFT performance (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 18
... THD = 1% Figure 20. THD vs. output power (1 kHz) Test conditions: Vcc = Ω, Rosc = 39 kΩ, Cosc = 100 nF kHz dB, Tamb = 25r C Specification limit: Typical THD = 1% 18/ THD + 0.5 0.2 0.1 0.05 0.02 0.01 100m 200m 500m 1 Output power (W) Doc ID 14926 Rev 4 TDA7492 10% THD 1% THD ...
Page 19
... TDA7492 Figure 21. THD vs. output (100 Hz) Test conditions: Vcc = Ω, Rosc = 39 kΩ, Cosc = 100 nF 100 Hz dB, Tamb = 25r C Specification limit: Typical THD = 1% Figure 22. THD vs. frequency Test conditions: Vcc = Ω, Rosc = 39 kΩ, Cosc = 100 nF kHz dB kHz Tamb = 25r C Specification limit: Typical: THD < 0.4% Figure 23 ...
Page 20
... Doc ID 14926 Rev 4 TDA7492 500 10k 20k Frequency (Hz) 500 10k 20k Frequency (Hz) 500 10k 20k Frequency (Hz) ...
Page 21
... TDA7492 4.4 Test board Figure 27. Test board layout Doc ID 14926 Rev 4 Characterization curves 21/32 ...
Page 22
... 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 14926 Rev 4 TDA7492 LC filter components Load L1,L2,L3,L4 C20,C26 4 Ω 15 µH 470 nF 6 Ω 22 µH 220 nF 8 Ω 33 µH 220 nF 16 Ω 68 µH 220 nF Nominal gain 21 ...
Page 23
... Applications information 6.1 Mode selection The three operating modes of the TDA7492 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 24
... Applications information 6.2 Gain setting The gain of the TDA7492 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 25
... 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 TDA7492 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 26
... It is 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 shown in Figure 33 Figure 33. Typical LC filter for a 8-Ω speaker Figure 34. Typical LC filter for a 4-Ω speaker 26/32 and Figure 34 below. Doc ID 14926 Rev 4 TDA7492 ...
Page 27
... TDA7492 6.6 Protection function The TDA7492 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 9 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 28
... As with most amplifiers, the power dissipated within the device depends primarily on the supply voltage, the load impedance and the output modulation level. The maximum estimated power dissipation for the TDA7492 is around °C ambient a heatsink having Rth =15 °C/W is sufficient for sine-wave testing at maximum power. A musical program, however, dissipates about 40% less power than this and a heatsink with Rth = 25 ° ...
Page 29
... TDA7492 7 Package mechanical data The TDA7492 comes in a 36-pin PowerSSO package with exposed pad up (EPU). Figure 36 shows the package outline and Figure 36. PowerSSO-36 EPU outline drawing Table 9 gives the dimensions. Doc ID 14926 Rev 4 Package mechanical data 29/32 ...
Page 30
... 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 - 0.413 - - 0.016 - - 8 degrees 0.024 - 0.039 - 0.169 - - - 10 degrees - 0.047 - - 0.031 - - 0.114 - - 0.144 - - 0.039 - 0.161 - 0.185 0.193 - 0.280 TDA7492 Max ® ...
Page 31
... TDA7492 8 Revision history Table 10. Document revision history Date 30-Jul-2008 4-Nov-2008 15-Apr-2009 03-Sep-2009 Revision 1 Initial release. Updated V details Updated Chapter 4: Characterization curves on page Updated supply operating range Changed beginning of Updated Table 5: Electrical specifications on page 9 condition, V min/max Updated Figure 3: Test circuit for characterizations on page 10 ...
Page 32
... 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 32/32 Please Read Carefully: © 2009 STMicroelectronics - All rights reserved STMicroelectronics group of companies www.st.com Doc ID 14926 Rev 4 TDA7492 ...