4 x 50 W MOSFET quad bridge power amplifier

4 X 50 W Mosfet Quad Bridge Power Amplifier-PDF Download

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Contents TDA7850,1 Block diagram and application circuit 5. 1 1 Block diagram 5,1 2 Standard test and application circuit 5. 2 Pin description 6,3 Electrical specifications 7,3 1 Absolute maximum ratings 7. 3 2 Thermal data 7,3 3 Electrical characteristics 8. 3 4 Electrical characteristic curves 11,4 Application hints 14.
4 1 SVR 14,4 2 Input stage 14,4 3 Standby and muting 14. 4 4 DC offset detector 14,4 5 Heatsink definition 14. 5 Package information 15,6 Revision history 17,TDA7850 List of tables. List of tables,Table 1 Device summary 1,Table 2 Absolute maximum ratings 7. Table 3 Thermal data 7,Table 4 Electrical characteristics 8.
Table 5 Document revision history 17,List of figures TDA7850. List of figures,Figure 1 Block diagram 5,Figure 2 Standard test and application circuit 5. Figure 3 Pin connection top view 6, Figure 4 Components and top copper layer of the Figure 2 10. Figure 5 Bottom copper layer Figure 2 10,Figure 6 Quiescent current vs supply voltage 11. Figure 7 Output power vs supply voltage RL 4 11,Figure 8 Output power vs supply voltage RL 2 11.
Figure 9 Distortion vs output power RL 4 11,Figure 10 Distortion vs output power RL 2 11. Figure 11 Distortion vs frequency RL 4 11,Figure 12 Distortion vs frequency RL 2 12. Figure 13 Crosstalk vs frequency 12, Figure 14 Supply voltage rejection vs frequency 12. Figure 15 Output attenuation vs supply voltage 12, Figure 16 Power dissipation and efficiency vs output power RL 4 SINE 12. Figure 17 Power dissipation and efficiency vs output power RL 2 SINE 12. Figure 18 Power dissipation vs output power RL 4 audio program simulation 13. Figure 19 Power dissipation vs output power RL 2 audio program simulation 13. Figure 20 ITU R ARM frequency response weighting filter for transient pop 13. Figure 21 Flexiwatt25 vertical mechanical data and package dimensions 15. Figure 22 Flexiwatt25 horizontal mechanical data and package dimensions 16. TDA7850 Block diagram and application circuit,1 Block diagram and application circuit.
1 1 Block diagram,Figure 1 Block diagram,470 F 100nF. MUTE HSD HSD VOFF DET,0 1 F PW GND,0 1 F PW GND,0 1 F PW GND. 0 1 F PW GND,AC GND SVR TAB S GND,0 47 F 47 F,1 2 Standard test and application circuit. Figure 2 Standard test and application circuit,0 1 F 2200 F. Vcc1 2 Vcc3 4,10K C9 8 OUT1,C2 0 1 F 18 OUT3,IN4 14 24 OUT4.
C4 0 1 F S GND 23,16 10 25 1,SVR HSD OD TAB, R3 10k to be placed when pin 25 is used as offset detector. Pin description TDA7850,2 Pin description,Figure 3 Pin connection top view. IN2 Vertical,Horizontal,TDA7850 Electrical specifications. 3 Electrical specifications,3 1 Absolute maximum ratings. Table 2 Absolute maximum ratings,Symbol Parameter Value Unit.
VS Operating supply voltage 18 V,VS DC DC supply voltage 28 V. VS pk Peak supply voltage for t 50 ms 50 V,Output peak current. IO repetitive duty cycle 10 at f 10 Hz 9 A,non repetitive t 100 s 10 A. Ptot Power dissipation Tcase 70 C 80 W,Tj Junction temperature 150 C. Tstg Storage temperature 55 to 150 C,3 2 Thermal data.
Table 3 Thermal data,Symbol Parameter Value Unit, Rth j case Thermal resistance junction to case Max 1 C W. Electrical specifications TDA7850,3 3 Electrical characteristics. Table 4 Electrical characteristics, Refer to the test and application diagram VS 14 4 V RL 4 Rg 600 f 1 kHz. Tamb 25 C unless otherwise specified,Symbol Parameter Test condition Min Typ Max Unit. Iq1 Quiescent current RL 100 180 280 mA, VOS Output offset voltage Play mode Mute mode 50 mV.
During mute ON OFF output,offset voltage ITU R ARM weighted. During Standby ON OFF output see Figure 20,offset voltage. Gv Voltage gain 25 26 27 dB,dGv Channel gain unbalance 1 dB. VS 13 2 V THD 10 23 25,VS 13 2 V THD 1 16 19,Po Output power VS 14 4 V THD 10 28 30. VS 14 4 V THD 1 20 23,VS 14 4 V THD 10 2 50 55 W,VS 14 4 V RL 4 50.
Po max Max output power 1 W,VS 14 4 V RL 2 85,Po 4W 0 006 0 02. THD Distortion,Po 15W RL 2 0 015 0 03,A Weighted 35 50. eNo Output noise V,Bw 20 Hz to 20 kHz 50 70, SVR Supply voltage rejection f 100 Hz Vr 1Vrms 50 75 dB. fch High cut off frequency PO 0 5 W 100 300 KHz,Ri Input impedance 80 100 120 K. f 1 kHz PO 4 W 60 70,CT Cross talk dB,f 10 kHz PO 4 W 60.
VST BY 1 5 V 20,ISB Standby current consumption A,VST BY 0 V 10. Ipin5 ST BY pin current VST BY 1 5 V to 3 5 V 1 A, VSB out Standby out threshold voltage Amp ON 2 75 V. VSB in Standby in threshold voltage Amp OFF 1 5 V,AM Mute attenuation POref 4 W 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. TDA7850 Electrical specifications,Table 4 Electrical characteristics continued.
Refer to the test and application diagram VS 14 4 V RL 4 Rg 600 f 1 kHz. Tamb 25 C unless otherwise specified,Symbol Parameter Test condition Min Typ Max Unit. Att 80 dB POref 4 W 6 5 7,VAM in VS automute threshold V. Att 0 1 dB PO 0 5W 7 5 8,VMUTE 1 5 V,Ipin23 Muting pin current Sourced Current. VMUTE 3 5 V 5 18 A,HSD section, Vdropout Dropout voltage IO 0 35 A VS 9 to 16 V 0 25 0 6 V. Iprot Current limits 400 800 mA,Offset detector Pin 25.
VM ON Mute voltage for DC offset 8 V,VST BY 5 V,VM OFF detection enabled 6 V. VOFF Detected differential output offset VST BY 5 V Vmute 8 V 2 3 4 V. Pin 25 voltage for detection VST BY 5 V Vmute 8 V,V25 T 0 1 5 V. TRUE VOFF 4 V,Pin 25 Voltage for detection VST BY 5 V Vmute 8 V. V25 F 12 V,FALSE VOFF 2 V,1 Saturated square wave output. Electrical specifications TDA7850, Figure 4 Components and top copper layer of the Figure 2.
Figure 5 Bottom copper layer Figure 2,TDA7850 Electrical specifications. 3 4 Electrical characteristic curves, Figure 6 Quiescent current vs supply Figure 7 Output power vs supply voltage. voltage RL 4,Id mA Po W,180 65 RL 4,60 f 1 KHz,8 10 12 14 16 18 8 9 10 11 12 13 14 15 16 17 18. Vs V AC00064 Vs V AC00064, Figure 8 Output power vs supply voltage Figure 9 Distortion vs output power. Po max VS 14 4 V,110 RL 2 RL 4,100 f 1 KHz,80 f 10 KHz.
8 9 10 11 12 13 14 15 16 17 18 0 1 1 10 100,Vs V AC00066. Po W AC00067, Figure 10 Distortion vs output power Figure 11 Distortion vs frequency. VS 14 4 V VS 14 4 V,1 1 Po 4 W,0 001 0 001,0 1 1 10 100 10 100 1000 10000 100000. Po W AC00068,Electrical specifications TDA7850, Figure 12 Distortion vs frequency Figure 13 Crosstalk vs frequency. THD CROSSTALK dB,VS 14 4 V 30 RL 4,RL 2 Po 4 W,1 Po 8 W 40 Rg 600.
10 100 1000 10000 100000 10 100 1000 10000 100000,f Hz f Hz AC00071. Figure 14 Supply voltage rejection vs Figure 15 Output attenuation vs supply. frequency voltage,SVR dB OUTPUT ATTN dB,Vripple 1 Vrms. Po 4 W ref,10 100 1000 10000 100000 5 6 7 8 9 10,AC00072 AC00073. Figure 16 Power dissipation and efficiency Figure 17 Power dissipation and efficiency. vs output power RL 4 SINE vs output power RL 2 SINE. Ptot W Ptot W,90 90 180 90,80 VS 14 4 V 80 160 VS 14 4 V 80. 70 f 1 KHz SINE 70 140 70,f 1 KHz SINE,60 60 120 60.
50 50 100 50,40 40 80 40,30 30 60 30,20 20 40 20,10 10 20 10. 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 0 5 10 15 20 25 30 35 40 45 50 55. Po W AC00074 Po W AC00075,TDA7850 Electrical specifications. Figure 18 Power dissipation vs output power Figure 19 Power dissipation vs output power. RL 4 audio program simulation RL 2 audio program simulation. Ptot W Ptot W,VS 13 2 V 55 VS 13 2 V,RL 4 x 4 50 RL 4 x 2. 25 GAUSSIAN NOISE GAUSSIAN NOISE,CLIP START,40 CLIP START. 0 1 2 3 4 5 6 0 2 4 6 8 10,Po W AC00076 Po W AC00077.
Figure 20 ITU R ARM frequency response,weighting filter for transient pop. Output attenuation dB,10 100 1000 10000 100000,Hz AC00343. Application hints TDA7850,4 Application hints,Referred to the circuit of Figure 2. 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. 4 2 Input stage, The TDA7850 s inputs are ground compatible and can stand very high input signals. 8Vpk without any performance degradation, If the standard value for the input capacitors 0 1 F is adopted the low frequency cut off.
will amount to 16 Hz,4 3 Standby and muting, Standby and Muting facilities are both CMOS compatible In absence of true CMOS ports or. microprocessors a direct connection to Vs of these two pins is admissible but a 470k. equivalent resistance should be present between the power supply and the muting and. ST BY pins, R C cells have always to be used in order to smooth down the transitions for preventing any. audible transient noises, 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,4 4 DC offset detector. The TDA7850 integrates a DC offset detector 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 which may lead to speakers damage for overheating The feature is enabled by. the MUTE pin according to table 3 and works with the amplifier unmuted and with no signal. on the inputs, The DC offset detection is signaled out on the HSD pin To ensure the correct functionality of.
the Offset Detector it is necessary to connect a pulldown 10 kW resistor between HSD and. 4 5 Heatsink definition, Under normal usage 4 Ohm speakers the heatsink s thermal requirements have to be. deduced from Figure 18 which reports the simulated power dissipation when real. music speech programmes are played out Noise with gaussian distributed amplitude was. employed for this simulation Based on that frequent clipping occurrence worst case will. cause Pdiss 26 W Assuming Tamb 70 C and TCHIP 150 C as boundary conditions the. heatsink s thermal resistance should be approximately 2 C W This would avoid any thermal. shutdown occurrence even after long term and full volume operation. TDA7850 Package information,5 Package information, In order to meet environmental requirements ST also offers these devices in ECOPACK. packages ECOPACK packages are lead free The category of second Level Interconnect. is marked on the package and on the inner box label in compliance with JEDEC Standard. JESD97 The maximum ratings related to soldering conditions are also marked on the inner. ECOPACK is an ST trademark ECOPACK specifications are available at www st com. Figure 21 Flexiwatt25 vertical mechanical data and package dimensions. MIN TYP MAX MIN TYP MAX,A 4 45 4 50 4 65 0 175 0 177 0 183 OUTLINE AND. B 1 80 1 90 2 00 0 070 0 074 0 079 MECHANICAL DATA. C 1 40 0 055,D 0 75 0 90 1 05 0 029 0 035 0 041,E 0 37 0 39 0 42 0 014 0 015 0 016. F 1 0 57 0 022,G 0 80 1 00 1 20 0 031 0 040 0 047,G1 23 75 24 00 24 25 0 935 0 945 0 955.
H 2 28 90 29 23 29 30 1 139 1 150 1 153,H1 17 00 0 669. H2 12 80 0 503,H3 0 80 0 031,L 2 22 07 22 47 22 87 0 869 0 884 0 904. L1 18 57 18 97 19 37 0 731 0 747 0 762,L2 2 15 50 15 70 15 90 0 610 0 618 0 626. L3 7 70 7 85 7 95 0 303 0 309 0 313,L4 5 0 197,L5 3 5 0 138. M 3 70 4 00 4 30 0 145 0 157 0 169,M1 3 60 4 00 4 40 0 142 0 157 0 173.
N 2 20 0 086,R 1 70 0 067,R1 0 5 0 02,R2 0 3 0 12,R3 1 25 0 049. R4 0 50 0 019,Flexiwatt25 vertical,1 dam bar protusion not included. September 2013 Rev 6 1 18 1 TDA7850 4 x 50 W MOSFET quad bridge power amplifier Features High output power capability 4 W 40 5 x max 4 W 40 3 x 14 4 V 1 kHz 10 2 W 40 8 x max 2 W 45 5 x 14 4V 1 kHz 10 MOSFET output power stage Excellent 2 driving capability Hi Fi class distortion Low output noise

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