TDA7576B Dual bridge MOSFET power amplifier for 24 V systems Datasheet production data Features ■ Multipower BCD technology ■ 24 V battery operation ■ MOSFET output power stage ■ High output power capability – 2 x 20 W/4 @ 24 V, 1 kHz; 10 % ■ Minimized external components – No decoupling capacitors – No bootstrap capacitor – No external compensation – Internally fixed gain '!0'03 Multiwatt15 ■ Standby function ■ Mute function ■ Diagnostic pin for: – clip detector (THD 2 %) – short circuit detection – thermal protection ■ Output DC offset detection ■ Protections: – 60 V load dump – Overrating chip temperature – Out short circuit protection (to GND, Vcc and across the load) – ESD Table 1. Description The TDA7576B is a dual bridge power amplifier with MOSFET output power stages. It has been specifically designed for 24 V power supply systems making it compatible with truck/bus applications. The feedback topology allows excellent distortion performances and the integrated buffer minimizes the need for external components. The fully complementary P-channel/N-channel output structure allows rail-to-rail output voltage swing minimizing saturation losses. The TDA7576B integrates a DC offset detector, a clipping detector and a diagnostic output. Device summary Order code Package Packing TDA7576B Multiwatt15 Tube September 2013 This is information on a product in full production. Doc ID 023511 Rev 3 1/17 www.st.com 1 Contents TDA7576B Contents 1 Block and application diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 Pins description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3 Electrical specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.4 Electrical characteristics curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 4 Principle of operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 5 Power dissipation computation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 6 Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 6.1 Diagnostics pins description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 6.2 Thermal protections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 7 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 2/17 Doc ID 023511 Rev 3 TDA7576B List of tables List of tables Table 1. Table 2. Table 3. Table 4. Table 5. Table 6. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Pins information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Doc ID 023511 Rev 3 3/17 List of figures TDA7576B 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. 4/17 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Application diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Pins connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Audio section waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Quiescent current vs. supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Output power vs. supply voltage (RL = 4 ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Distortion vs. output power (RL = 4 ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Crosstalk vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Total power dissipation and efficiency vs. Po (RL = 4 ) . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Power dissipation vs. average Po (audio program simulation, 4 ) . . . . . . . . . . . . . . . . . . 10 Amplifier structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Thermal protection diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Multiwatt 15 (vertical) mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . 15 Doc ID 023511 Rev 3 TDA7576B 1 Block and application diagrams Block and application diagrams Figure 1. Block diagram 6## 6## /54 ). /$ 6REF ). /54 34"9 #$ 0- (6## 362 0'.$ 3'.$ 0'.$ '!0'03 Figure 2. Application diagram & # 6## & 6## # 6## 0'.$ 34"9 0- 2 + 2 # + # /54 & & ). (6## #& ). 362 7 7 #& /54 #& 6## 2 2 3'.$ + /$ Doc ID 023511 Rev 3 6## + #$ '!0'03 5/17 Pins description 2 TDA7576B Pins description Figure 3. Pins connection (top view) 0- ). 34"9 6## /54 0'.$ (6## 3'.$ 6## /54 0'.$ 362 ). /$ #$ '!0'03 Table 2. 6/17 Pins information Pin number Pin name 1 CD Clip Detector Open collector output -0.3/VS 2 OD Offset Detector Open collector output -0.3/VS 3 IN2 Left channel input Input -0.3/5 V 4 SVR SVR Output -0.3/20 V 5 PGND2 Power ground 2 Ground -0.3/0.3 6 OUT2 Left channel output Output N.A. 7 VCC2 Supply voltage 2 Supply -0.3/VS 8 SGND Signal ground Ground -0.3/0.3 9 HVCC Half supply voltage buffer Output 10 PGND1 11 Description Type Max. applicable voltage N.A. Power ground 1 Ground -0.3/0.3 OUT1 Right channel output Output N.A. 12 VCC1 Supply voltage 1 Supply -0.3/VS 13 STBY STBY pin Input -0.3/VS 14 IN1 Right channel input Input -0.3/5 V 15 PM Play/Mute pin Input -0.3/5 V Doc ID 023511 Rev 3 TDA7576B Electrical specification 3 Electrical specification 3.1 Absolute maximum ratings Table 3. Absolute maximum ratings Symbol Value Unit Operating supply voltage 32 V VSPK Peak supply voltage (t = 50 ms) not operating 60 V VDCS Not operating max. DC supply voltage 36 V Ground pins -0.3 to 0.3 V VCC Supply voltage -0.3 to Vs V SVR Supply voltage rejection filter -0.3 to 20 V IN1, IN2 Inputs -0.3 to 5 V OD, CD Offset detector, clip detector pins -0.3 to Vs V Play-mute pin -0.3 to 5 V 85 W -40 to 150 C Value Unit 2 °C/W VS PGND, SGND PM Ptot (1) Tstg, Tj Parameter Power dissipation at Tcase = 85 °C Storage and junction temperature range 1. Refer to Section 5 for detailed description of this value. 3.2 Thermal data Table 4. Thermal data Symbol Rth j-case 3.3 Parameter Thermal resistance junction-to-case Max. Electrical characteristics Refer to the test circuit; VS = 28 V; RL = 4 , Tamb = 25 °C, f = 1 kHz, Rg = 0, unless otherwise specified. Table 5. Symbol Electrical characteristics Parameter Test condition Min. Typ. Max. Unit General VS Supply voltage - 8 - 32 V Iq Total quiescent current RL = - 90 130 mA Standby current consumption 0 < VST_BY < 1.2 V - - 10 µA Input impedance - 50 55 - k IST-BY RIN Doc ID 023511 Rev 3 7/17 Electrical specification Table 5. TDA7576B Electrical characteristics (continued) Symbol Parameter Test condition Min. Typ. Max. Unit VOS Offset voltage - -100 - +100 mV Vdth Dump threshold - 36 37.5 39 V Dump current VS = 60 V - 18 40 mA THD = 1 % 20 22 - THD = 10 % 25 28 - Max. output power(1) - 43 45 - W THD Distortion Po = 4 W; f = 1 kHz - 0.05 0.1 % CT Cross talk f = 1 kHz; Po = 4 W f = 10 kHz; Po = 4 W 50 45 65 60 - dB dB Gv Voltage gain 25 26 27 dB Amplifier in Mute - 60 100 µV ID Audio section Po Po max. Output power voltage(2) W ENO Output noise SVR Supply voltage rejection f = 1 kHz; VR = 1 Vpk - 50 - dB Standby input threshold voltage - - - 1.2 V Standby output threshold voltage - 2.6 - - V ASB Standby attenuation - 90 110 - dB IPIN Standby pin current Play mode -1 - 1 µA Mute attenuation - 90 100 - dB Mute input threshold voltage (Amp: Mute) - - 1.2 V VM OUT Mute output threshold voltage (Amp: Play) 2.6 - - V VAM in VS automute threshold Amp: play, attenuation = -3 dB Vout = 2 Vrms; f = 1 kHz 6.7 7.25 8 V Standby VSB IN VSB OUT Mute pin AM VM IN Clipping detector(3) CDTHD Clipping detector THD level 10 V < Vs < 32 V - 2 - % CDSAT Clipping detector saturation voltage 10 V < Vs < 32 V; Cd; On; ICD = 1 mA - - 0.2 V ±1 ±2 ±3 V - - 0.2 V Offset detector OD VOFF_SAT Offset detector Power amp. in play AC input = 0 Offset detector saturation voltage Vo-Vhvcc > 3 V, IOD = 1 mA 1. Square wave input. 2. 22 Hz to 22 kHz. 3. Clip detector not guaranteed for Vs < 10 V. 8/17 Doc ID 023511 Rev 3 TDA7576B Electrical specification Figure 4. Audio section waveforms 34"90). 6/,4!'% T -54%0). 6/,4!'% T 6S /54054 7!6%&/2T $)!'PIN 7!6%&/2T #,)00).' 3(/244/'.$ /24/6S 3.4 Electrical characteristics curves Figure 5. Quiescent current vs. supply voltage Figure 6. ,GP$ 9L 5/ c Output power vs. supply voltage (RL = 4 ) 2 , 7 FK(Z 0OMAX '!0'03 0O7 4(%2-!, 02/8)-)49 4($ 4($ 9V9 '!0'03 Doc ID 023511 Rev 3 '!0'03 9/17 Electrical specification Figure 7. TDA7576B Distortion vs. output power (RL = 4 ) Figure 8. 7+' &52667$/.G% 9V 9 5/ 7 Crosstalk vs. frequency 5/ 7 3 R : 5J 7 I N+] I N+] Figure 9. 3R: Total power dissipation and efficiency vs. Po (RL = 4 ) H 9V 9 5/ 7 I N+]6,1( H 3GLVV 10/17 '!0'03 9V 9 5/ [7 $XGLRSURJUDPVLPXODWLRQ &/,367$57 3GLVV: I+] Figure 10. Power dissipation vs. average Po (audio program simulation, 4 ) 3GLVV: '!0'03 3R: '!0'03 Doc ID 023511 Rev 3 3R: '!0'03 TDA7576B 4 Principle of operation Principle of operation The TDA7576B is an innovative stereo audio amplifier meant for 24 V battery vehicles. The amplifier works in a single-ended configuration without the large decoupling capacitors on the outputs normally required by the s.e. topology. Its principle of operation is depicted in Figure 11. Figure 11. Amplifier structure 6REF #HANNELINVERTING )N /UT (6CC 6REF )O 362 (6CC )(6CC )O )N #HANNELNONINVERTING 6REF 6REF /UT (6CC '!0'03 Channel 1 is electrically inverting its input signal whereas channel 2 is not; if the speakers are connected with the positive pole of speaker 2 connected to Out2 and the negative pole of speaker 1 connected to Out1, then the two channels both behave as non-inverting. Speaker 1 and speaker 2 have one terminal in common and further connected to a half Vcc (HVCC) buffer. If the signals at In1 and In2 are identical, then the voltage at Out1 and Out2 is identical in magnitude but inverted (Out1 = -Out2), and the current flowing through speaker 1 is all coming from speaker 2, with no current going into the HVCC buffer. If the signal at In1 is not identical to that at In2, then the signal at the two outputs will not be identical either, and some current will flow into or out of the HVCC buffer, keeping the voltage at HVCC constant. This structure allows therefore the amplifier to operate in a single-ended configuration with no need for decoupling capacitors. Mathematically this can be expressed as: VL1 = -G * Vin1 VL2 = +G * Vin2 IHVCC = Io1 + Io2 = VL1/RL + VL2/RL = G (Vin2 - Vin1) / RL Doc ID 023511 Rev 3 11/17 Principle of operation TDA7576B where VL1,2 is the voltage across speaker 1 or 2, G is the gain of the amplifiers and RL is the load resistance (supposed identical for the two speakers). In the common practice the two channels of the amplifier are used for the left and the right audio parts of the stereo signal, and therefore the two outputs are not identical. This means that it is never mathematically true that all the current into one speaker comes from the other speaker, so the HVcc buffer will always have to provide a certain amount of difference current. Apart from the fact that the left and the right audio channels are not identical unless the program is monophonic, other reasons why the HVcc buffer has to provide current are: imbalance in the level of the L and the R channel, equalization-induced delay in one channel compared to the other. The current provided by the HVCC buffer leads to non-negligible power dissipation inside the IC: this should be added to power dissipation the output stages 1 and 2. It is necessary to keep this additional dissipation in mind when dimensioning the car-radio heat sink. 12/17 Doc ID 023511 Rev 3 TDA7576B 5 Power dissipation computation Power dissipation computation The instantaneous power dissipated by each output stage is given by the formula below: PD1,2(t) = 1/RL |VL1,2(t)| (Vcc/2 - |VL1,2(t)|) with VL1,2(t) being the output signal on each of the two channels (VL1,2(t) = G * Vin1,2(t)). If the two input signals are not identical, as seen in Section 4 a current IHVcc flows into or out of the half Vcc buffer; this current causes dissipation within the HVcc buffer given by: PDHVCC(t) = Vcc/(2RL) | VL2(t) - VL1(t) | which is obviously 0 when the two channels have identical signals. The total instantaneous power dissipation inside the TDA7576B is therefore given by: Pdtot(t) = PD1(t) + PD2(t) + PDHVCC(t). The dimensioning of the heat sink of the system must take into consideration these three components. For more details on power dissipation and recommendations on heat-sink characteristics computation, please refer to the complete application note related to this subject. Doc ID 023511 Rev 3 13/17 Functional description TDA7576B 6 Functional description 6.1 Diagnostics pins description TDA7576B includes an offset detector pin and a clip detector and diagnostic pin. DC offset detector is intended to avoid that an anomalous DC offset on the inputs of the amplifier may be multiplied by the gain and result in a dangerous large offset on the outputs. This may lead to speakers damage due to overheating. The feature works with the amplifier unmuted and no signal at the inputs. Moreover there is a pin named CD/Diag: the behavior of this pin is showed on Figure 4. Whenever a failure condition (between thermal warning, output waveform clipping, short circuit to GND or VCC) is verified by the IC the level of this pin goes true (low). 6.2 Thermal protections Thermal protection function is triggered when junction temperature rises above the normal operating range, thus avoiding chip damaging. For behavior description, refer to Figure 4 and 12. When temperature is reaching thermal warning (Tw = typ 140 °C) the CD/Diag pin is driven low. Thermal foldback begins limiting the audio input to the amplifier stage, this effectively limits the output power capability of the device thus reducing the temperature to acceptable levels without totally interrupting the operation of the device. Thermal mute is temperature when -6 dB output attenuation is reached (typical Tm = 160 °C). The output power will decrease to the point at which thermal equilibrium is reached. Thermal equilibrium will be reached when the reduction in output power reduces the dissipated power such that the die temperature falls below the thermal foldback threshold. Figure 12. Thermal protection diagram 6OUT 6OUT 4W $IAG LOW 4J # 4J # 14/17 Doc ID 023511 Rev 3 '!0'03 TDA7576B 7 Package information Package information In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK® packages, depending on their level of environmental compliance. ECOPACK® specifications, grade definitions and product status are available at: www.st.com. ECOPACK® is an ST trademark. Figure 13. Multiwatt 15 (vertical) mechanical data and package dimensions $)- INCH MM -). 490 -!8 -). 490 -!8 ! " # $ % & ' ' ( ( , /54,).%!.$ -%#(!.)#!,$!4! , , , , , - - 3 3 $IA -ULTIWATT6ERTICAL * '!0'03 Doc ID 023511 Rev 3 15/17 Revision history 8 TDA7576B Revision history Table 6. 16/17 Document revision history Date Revision Changes 26-Sep-2012 1 Initial release. 05-Oct-2012 2 Updated Section 1: Block and application diagrams. Updated Section 2: Pins description. 18-Sep-2013 3 Updated Disclaimer. Doc ID 023511 Rev 3 TDA7576B 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. 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The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners. © 2013 STMicroelectronics - All rights reserved STMicroelectronics group of companies 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 www.st.com Doc ID 023511 Rev 3 17/17