TDA7381

TDA7381 4 x 25 W quad bridge car radio amplifier Datasheet  production data Features ■ High output power capability: – 4 x 30 W/4  max. – 4 x 25 W/4  EIAJ – 4 x 18 W/4  @ 14.4 V, 1 kHz, 10 % – 4 x 15 W/4  @ 13.2 V, 1 kHz, 10 % ■ Clipping detector ■ Low distortion ■ Low output noise ■ Standby function ■ Mute function ■ Automute at min. supply voltage detection ■ Diagnostics facility for: – Clipping – Out to GND short – Out to VS short – Thermal shutdown '!0'03 Flexiwatt25 – – – – Description The TDA7381 is a class AB audio power amplifier in Flexiwatt25 package designed for car radio applications. Thanks to the fully complementary PNP/NPN output configuration the TDA7381 allows a rail to rail output voltage swing with no need of bootstrap capacitors.. ■ Low external component count: – Internally fixed gain (26 dB) – No external compensation – No bootstrap capacitors ■ Protections: – Output short circuit to GND, to VS, across the load – Very inductive loads – Overrating chip temperature with soft thermal limiter Table 1. Load dump voltage Fortuitous open GND Reversed battery ESD protection The extremely reduced components count allows very compact sets. The on-board clipping detector simplifies gain compression operations. The fault diagnostics makes it possible to detect mistakes during car-radio assembly and wiring in the car. Device summary Order code Package Packing TDA7381 Flexiwatt25 Tube September 2013 This is information on a product in full production. Doc ID 4947 Rev 8 1/15 www.st.com 1 Contents TDA7381 Contents 1 Block / application diagram and pins connection diagram . . . . . . . . . . 5 2 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3 2.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.3 Electrical characteristcs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.4 Printed circuit board and component layout . . . . . . . . . . . . . . . . . . . . . . . . 8 Application hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 3.1 Biasing and SVR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 3.2 Input stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 3.3 Standby and muting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 3.4 Diagnostics facility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.5 Stability and layout considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 5 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 2/15 Doc ID 4947 Rev 8 TDA7381 List of tables List of tables Table 1. Table 2. Table 3. Table 4. Table 5. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Electrical characteristcs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Doc ID 4947 Rev 8 3/15 List of figures TDA7381 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. 4/15 Block and application diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Pins connection diagram (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Standard test and application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Components and top copper layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Bottom copper layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Input/output biasing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Diagnostics circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Clipping detection waveforms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Diagnostics waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 An example of circuit able to distinguish between the two occurrences . . . . . . . . . . . . . . . 12 Flexiwatt25 mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Doc ID 4947 Rev 8 TDA7381 Block / application diagram and pins connection diagram Figure 1. Block and application diagram 6CC 6CC M& N& 34 "9 $)!'./54 -54% /54 ). /54 M& 07 '.$ /54 ). /54 07 '.$ M& /54 ). /54 M& 07 '.$ /54 ). /54 07 '.$ M& !# '.$ M& 362 M& 4!" 3 '.$ '!0'03 Pins connection diagram (top view) Doc ID 4947 Rev 8 0 '.$ $)!'./34)#3 -54% /54 6## /54 /54 /54 0 '.$ ). !# '.$ ). ). 3 '.$ ). 362 /54 0 '.$ 6## /54 34 "9 /54  /54  4!" Figure 2. 0 '.$ 1 Block / application diagram and pins connection diagram '!0'03 5/15 Electrical specifications TDA7381 2 Electrical specifications 2.1 Absolute maximum ratings Table 2. Absolute maximum ratings Symbol Parameter Value Unit Operating supply voltage 18 V VCC (DC) DC supply voltage 28 V VCC (pk) Peak supply voltage (t = 50 ms) 50 V Output peak current: Repetitive (duty cycle 10 % at f = 10 Hz) Non repetitive (t = 100 s) 3 4 A A Power dissipation, (Tcase = 70 °C) 80 W Tj Junction temperature 150 C Tstg Storage temperature -40 to 150 C VCC IO Ptot 2.2 Thermal data Table 3. Thermal data Symbol Rth j-case 2.3 Parameter Thermal resistance junction to case max. Value Unit 1 °C/W Electrical characteristcs VS = 14.4 V; f = 1 kHz; Rg = 600 ; RL = 4 ; Tamb = 25 °C; Refer to the test and application circuit (Figure 3), unless otherwise specified. Table 4. Symbol Iq1 VOS Gv Po Po EIAJ Po max 6/15 Electrical characteristcs Parameter Test Condition Min. Typ. Max. Unit Quiescent current - - 180 300 mA Output offset voltage - - - 100 mV Voltage gain - 25 26 27 dB THD = 10 % 16.5 18 - W THD = 1 % 13 14 - W THD = 10 %; VS = 13.2 V 13.5 15 - W Output power THD = 1 %; VS = 13.2 V 11 12 - W EIAJ output power (1) EIAJ (VS = 13.7 V) 23 25 - W Max. output power (1) VS = 13.7 V 28 30 - W Doc ID 4947 Rev 8 TDA7381 Table 4. Symbol Electrical specifications Electrical characteristcs (continued) Parameter Test Condition Min. Typ. Max. Unit Po = 4 W - 0.04 0.3 % "A" Weighted - 50 - V Bw = 20 Hz to 20 kHz - 65 150 V 50 65 - dB THD Distortion eNo Output noise SVR Supply voltage rejection f = 100 Hz fcl Low cut-off frequency - - 20 - Hz fch High cut-off frequency - 75 - - KHz Ri Input impedance - 70 100 - K CT Cross talk f = 1KHz 50 70 - dB ISB St-by current consumption St-by = LOW - - 100 A VSB out St-by out threshold voltage (Amp: ON) 3.5 - - V VSB IN St-by in threshold voltage (Amp: OFF) - - 1.5 V Mute attenuation VO = 1 Vrms 80 90 - dB VM out Mute out threshold voltage (Amp: play) 3.5 - - V VM in Mute in threshold voltage (Amp: mute) - - 1.5 V Im (L) Muting pin current VMUTE = 1.5 V; (source current) 5 10 16 A ICDOFF Clipping detector "OFF" output average current THD = 1 % (2) - 100 - A ICDON Clipping Detector "ON" Output Average Current THD = 10 % (2) 100 240 350 A AM 1. Saturated square wave output. 2. Diagnostics output pulled-up to 5 V with 10 k series resistor. Figure 3. Standard test and application circuit # M& # M& 6CC  6CC   2 34 "9    + 2 # M& -54%  + # # M& ).       #M& ). /54   #M&   ). #M& /54  M& ). /54   3 '.$   # M& /54     362 # M&  4!" $)!'./34)#3 Doc ID 4947 Rev 8 '!0'03 7/15 Electrical specifications 2.4 TDA7381 Printed circuit board and component layout Referred to Figure 3: Standard test and application circuit. 8/15 Figure 4. Components and top copper layer Figure 5. Bottom copper layer Doc ID 4947 Rev 8 TDA7381 Application hints 3 Application hints 3.1 Biasing and SVR As shown by Figure 6, all the TDA7381’s main sections, such as Inputs, Outputs and ACGND (pin 16) are internally biased at half supply voltage level (Vs/2), which is derived from the supply voltage rejection (SVR) block. In this way no current flows through the internal feedback network. The AC-GND is common to all the 4 amplifiers and represents the connection point of all the inverting inputs. Both individual inputs and AC-GND are connected to Vs/2 (SVR) by means of 100 k resistors. To ensure proper operation and high supply voltage rejection, it is of fundamental importance to provide a good impedance matching between INPUTS and AC-GROUND terminations. This implies that C1, C2, C3, C4, C5 capacitors have to carry the same nominal value and their tolerance should never exceed ±10 %. Besides its contribution to the ripple rejection, the SVR capacitor governs the turn ON/OFF time sequence and, consequently, plays an essential role in the pop optimization during ON/OFF transients. To conveniently serve both needs, its minimum recommended value is 10 F. 3.2 Input stage The TDA7381’s inputs are ground-compatible and can stand very high input signals (± 8 Vpk) without any performances degradation. If the standard value for the input capacitors (0.1 F) is adopted, the low frequency cut-off will amount to 16 Hz. 3.3 Standby and muting Standby and muting facilities are both CMOS-compatible. If unused, a straight connection to Vs of their respective pins would be admissible. Conventional low-power transistors can be employed to drive muting and standby pins in absence of true CMOS ports or microprocessors. R-C cells have always to be used in order to smooth down the transitions for preventing any audible transient noises. Since a DC current of about 10 A normally flows out of pin 22, the maximum allowable muting-series resistance (R2) is 70 k, which is sufficiently high to permit a muting capacitor reasonably small (about 1F). If R2 is higher than recommended, the involved risk will be that the voltage at pin 22 may rise to above the 1.5 V threshold voltage and the device will consequently fail to turn OFF when the mute line is brought down. About the standby, the time constant to be assigned in order to obtain a virtually pop-free transition has to be slower than 2.5 V/ms. Doc ID 4947 Rev 8 9/15 Application hints 3.4 TDA7381 Diagnostics facility The TDA7381 is equipped with a diagnostics circuitry able to detect the following events: ● Clipping in the output stage ● Overheating (thermal shut-down proximity) ● Output misconnections (OUT-GND and OUT-Vs shorts) Diagnostics information is available across an open collector output located at pin 25 (fig. 8) through a current sinking whenever at least one of the above events is recognized. Among them, the Clipping detector acts in a way to output a signal as soon as one or more power transistors start being saturated. As a result, the clipping-related signal at pin 25 takes the form of pulses, which are perfectly syncronized with each single clipping event in the music program and reflect the same duration time (Figure 8). Applications making use of this facility usually operate a filtering/integration of the pulses train through passive R-C networks and realize a volume (or tone bass) stepping down in association with microprocessor-driven audioprocessors. The maximum load that pin 25 can sustain is 1 k. Due to its operating principles, the clipping detector has to be viewed mainly as a power-dependent feature rather than frequency-dependent. This means that clipping state will be immediately signaled out whenever a fixed power level is reached, regardless of the audio frequency. Figure 6. Input/output biasing. +7  M& #ž# +7 ). 7 7 63 +7 +7 +7 +7 362 +7 !#?'.$ M& # M& #  4/7!2$3 /4(%2#(!..%,3 '!0'03 Figure 7. Diagnostics circuit  2 62%& 6PIN 4$! '!0'03 10/15 Doc ID 4947 Rev 8 TDA7381 Application hints Figure 8. Clipping detection waveforms. 6O !5$)/ /54054 3)'.!, #,)00).' $%4 /54054#522%.4 )#,)0  TIME '!0'03 In other words, this feature offers the means to counteract the extremely sound-damaging effects of clipping, caused by a sudden increase of odd order harmonics and appearance of serious intermodulation phenomena. Another possible kind of distortion control could be the setting of a maximum allowable THD limit (e.g. 0.5%) over the entire audio frequency range. Besides offering no practical advantages, this procedure cannot be much accurate, as the non-clipping distortion is likely to vary over frequency. In case of overheating, pin 25 will signal out the junction temperature proximity to the thermal shut-down threshold. This will typically start about 2°C before the thermal shutdown threshold is reached. As various kind of diagnostics information is available at pin 25 (clipping, shorts and overheating), it may be necessary to operate some distinctions on order to treat each event separately. This could be achieved by taking into account the intrinsically different timing of the diagnostics output under each circumstance. In fact, clipping will produce pulses normally much shorter than those present under faulty conditions. An example of circuit able to distinguish between the two occurrences is shown by Figure 10. Figure 9. Diagnostics waveforms 34 "90). 6/,4!'% T -54%0). 6/,4!'% T 6S /54054 7!6%&/2T 6PIN 7!6%&/2T #,)00).' 3(/244/'.$ /24/6S 4(%2-!, 02/8)-)49 '!0'03 Doc ID 4947 Rev 8 11/15 Application hints 3.5 TDA7381 Stability and layout considerations If properly layouted and hooked to standard carradio speakers, the TDA7381 will be intrinsically stable with no need of external compensations such as output R-C cells. Due to the high number of channels involved, this translates into a very remarkable components saving if compared to similar devices on the market. To simplify pc-board layout designs, each amplifier stage has its own power ground externally accessible (pins 2,8,18,24) and one supply voltage pin for each couple of them. Even more important, this makes it possible to achieve the highest possible degree of separation among the channels, with remarkable benefits in terms of cross-talk and distortion features. About the layout grounding, it is particularly important to connect the AC-GND capacitor (C5) to the signal GND, as close as possible to the audio inputs ground: this will guarantee high rejection of any common mode spurious signals. The SVR capacitor (C6) has also to be connected to the signal GND. Supply filtering elements (C7, C8) have naturally to be connected to the power-ground and located as close as possible to the Vs pins. Pin 1, which is mechanically attached to the device’s tab, needs to be tied to the cleanest power ground point in the pc-board, which is generally near the supply filtering capacitors. Figure 10. An example of circuit able to distinguish between the two occurrences 62%& 4   4 62%& 4$!  44 62%&q62%&62%& 12/15 #,)0$%44/'!). #/-02%33/2 4/.%#/.42/, &!5,44(%2-!,3(54$/7. 4/0/7%23500,9 3%#4)/.M06/,4!'% 2%'5,!4/2&,!3().'3934%- 62%& Doc ID 4947 Rev 8 '!0'03 TDA7381 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 11. Flexiwatt25 mechanical data and package dimensions $)- ! " # $ % & ' ' ( ( ( ( , , , , , , - . / 2 2 2 2 2 6 6 6 6 -).              MM 490                           -!8   -).                          INCH 490                           -!8   /54,).%!.$ -%#(!.)#!,$!4!             &LEXIWATTVERTICAL ƒ7\S ƒ7\S ƒ7\S ƒ7\S  DAM BARPROTUSIONNOTINCLUDED  MOLDINGPROTUSIONINCLUDED 6 # " 6 ( ( 6 ! ( / ( 2 , 2 6 2 , . 2 , 4 Package information , , 6 6 2 $ 2 , 0IN 2 2 % ' ' & &,%8-% - -  '!0'03 Doc ID 4947 Rev 8 13/15 Revision history 5 TDA7381 Revision history Table 5. 14/15 Document revision history Date Revision Changes 12-Oct-1999 5 Initial release. 27-Jun-2008 6 Document reformatted. Document promoted from preliminary data to datasheet. Added Table 1: Device summary. Added ECOPACK description in Section 4: Package information. 26-Jul-2012 7 Updated Figure 9: Diagnostics waveforms on page 11. 16-Sep-2013 8 Updated Disclaimer. Doc ID 4947 Rev 8 TDA7381 Please Read Carefully: Information in this document is provided solely in connection with ST products. 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