Stimmen - 5, Durchschnittliche Bewertung: 3.8
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Anleitung Zusammenfassung
40 W BTL quad car radio power TDA8571J amplifier FEATURES • Requires very few external components • High output power • Low output offset voltage • Fixed gain • Diagnostic facility (distortion, short-circuit and temperature pre-warning) • Good ripple rejection • Mode select switch (operating, mute and standby) • Load dump protection • Short-circuit safe to ground and to VP and across the load • Low power dissipation in any short-circuit condition • Thermally protected • Reverse polarity safe • Electrostatic discharge protection • No switch-on/switch-off plop • Flexible leads • Low thermal resistance • Pin compatible with the TDA8568Q, except for the gain. QUICK REFERENCE DATA GENERAL DESCRIPTION The TDA8571J is a integrated class-B output amplifier contained in a 23-lead Single-In-Line (SIL) plastic power package. It contains four amplifiers in a BTL configuration, each with a gain of 34 dB. The output power is 4 . 40 W (EIAJ) into a 4 W load. APPLICATIONS • Primarily developed for car radio applications. SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT VP operating supply voltage 6 14.4 18 V IORM repetitive peak output current - - 7.5 A Iq(tot) total quiescent current - 200 - mA Istb standby current - 0.2 100 mA Isw switch-on current - - 80 mA iZii input impedance 25 30 - kW Po(EIAJ) EIAJ output power THD = maximum - 40 - W SVRR supply voltage ripple rejection Rs =0 W - 50 - dB acs channel separation Rs =10kW - 50 - dB Gv(cl) closed-loop voltage gain 33 34 35 dB Vn(o) noise output voltage Rs =0 W - - 170 mV iVOSi DC output offset voltage MUTE - - 80 mV iDVOSi delta DC output offset voltage ON « MUTE - - 80 mV ORDERING INFORMATION TYPE PACKAGE NUMBER NAME DESCRIPTION VERSION TDA8571J DBS23P plastic DIL-bent-SIL power package; 23 leads (straight lead length 3.2 mm) SOT411-1 2002 Mar 05 2 Philips Semiconductors Product specification Philips Semiconductors Product specification TDA8571J amplifier BLOCK DIAGRAM Fig.1 Block diagram. MGM562 OUT1+ OUT1- + - + - Vref 2IN1 IN2 4 23168115 10 MODE VP1 VP2 VP3 VP4 211863 PGND1 PGND2 PGND3 PGND4 30 kW OUT2+ OUT2- + - + - 7 5 11 30 kW OUT3+ OUT3- + - + - Vref 17IN3 SGND TDA8571J IN4 19 13 12 30 kW OUT4+ OUT4- + - + - 22 20 14 30 kW VDIAGDIAGNOSTIC 9 2002 Mar 05 3 Philips Semiconductors Product specification Philips Semiconductors Product specification TDA8571J amplifier PINNING SYMBOL PIN DESCRIPTION VP1 1 supply voltage 1 OUT1+ 2 output 1+ PGND1 3 power ground 1 OUT1- 4 output 1- OUT2- 5 output 2- PGND2 6 power ground 2 OUT2+ 7 output 2+ VP2 8 supply voltage 2 VDIAG 9 diagnostic output IN1 10 input 1 IN2 11 input 2 SGND 12 signal ground IN3 13 input 3 IN4 14 input 4 MODE 15 mode select switch input VP3 16 supply voltage 3 OUT3+ 17 output 3+ PGND3 18 power ground 3 OUT3- 19 output 3- OUT4- 20 output 4- PGND4 21 power ground 4 OUT4+ 22 output 4+ VP4 23 supply voltage 4 VP1 OUT1+ PGND1 OUT1- OUT2- PGND2 OUT2+ VP2 VDIAG IN1 IN2 SGND IN3 IN4 MODE VP3 OUT3+ PGND3 OUT3- OUT4- PGND4 OUT4+ VP4 TDA8571J 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 MGM563 Fig.2 Pin configuration. 2002 Mar 05 4 Philips Semiconductors Product specification Philips Semiconductors Product specification TDA8571J amplifier FUNCTIONAL DESCRIPTION The TDA8571J contains four identical amplifiers which can be used for bridge applications. The gain of each amplifier is fixed at 34 dB. Mode select switch (pin MODE) · Standby: low supply current (<100 mA) · Mute: input signal suppressed · Operating: normal on condition. Since this pin has a low input current (<80 mA), a low cost supply switch can be applied. To avoid switch-on plops, it is advised to keep the amplifier in the mute mode during .150 ms (charging of the input capacitors at pins IN1, IN2, IN3 and IN4. When switching from standby to mute, the slope should be at least 18 V/s. This can be realized by: · Microprocessor control · External timing circuit (see Fig.3). Diagnostic output (pin VDIAG) DYNAMIC DISTORTION DETECTOR (DDD) At the onset of clipping of one or more output stages, the dynamic distortion detector becomes active and pin VDIAG goes LOW. This information can be used to drive a sound processor or DC volume control to attenuate the input signal and so limit the distortion. The output level of pin VDIAG is independent of the number of channels that are clipping (see Fig.4). SHORT-CIRCUIT DIAGNOSTIC When a short-circuit occurs at one or more outputs to ground or to the supply voltage, the output stages are switched off until the short-circuit is removed and the device is switched on again, with a delay of approximately 10 ms after removal of the short-circuit. During this short-circuit condition, pin VDIAG is continuously LOW. When a short-circuit occurs across the load of one or more channels, the output stages are switched off during approximately 10 ms. After that time it is checked during approximately 50 ms to determine whether the short-circuit is still present. Due to this duty cycle of 50 ms/10 ms the average current co...