Philips Semiconductors FEATURES Flexibility in use load Few external components Low saturation voitage of output stage Gain can be fixed with external resistors Standby mode controlled by CMOS compatible levels Low standby current No switch-on/switch-off plops High supply voltage ripple rejection Protected against electrostatic discharge Outputs short-circuit safe to ground, Vcc and across the Thermally protected. Preliminary specification DT 2 x 1 W BTL audio amplifier GENERAL DESCRIPTION TDA8542 The TDA8542(T) is a two channel audio power amplifier for an output power of 2 x 1 W with an 8 Q load ata5V the TDA8542 in a 16 pin DIP package. APPLICATIONS Portable consumer products e Personal computers e Motor-driver (servo). supply. The circuit contains two BTL amplifiers with a complementary PNP-NPN output stage and standby/mute logic. The TDA8542T comes in a 16 pin SO package and QUICK REFERENCE DATA SYMBOL PARAMETER CONDITIONS MIN. | TYP. | MAX. | UNIT Vec supply voltage 2.2 5 18 Vv lg quiescent current Veco =5V - 15 22 mA Istb standby current - - 10 LA Py output power THD = 10%; Rp = 8; Veg = 5 V | 1 - - Ww THD total harmonic distortion P,= 0.5 W - 0.15 |~- %o SVRR supply voitage ripple rejection 50 - - dB ORDERING INFORMATION TYPE PACKAGE NUMBER NAME DESCRIPTION VERSION TDA8542T SO16L | plastic smail outline package; 16 leads; body width 7.5 mm SOT162-1 TDA8541 DIP16 | plastic dual in-line package; 16 leads (300 mil); long body SOT38-1 1996 May 06Philips Semiconductors 2x 1W BTL audio amplifier Preliminary specification TDA8542 BLOCK DIAGRAM INL- INL+ INR- INR+ SVA MODE BTUSE Vcc. Yocr 11 <= 20 kQ /| [18 | BN 2 \ } i kQ STANDBY/MUTE LOGIC 12 20 kkk TDA8542 rs t 7 20kQ _ STANDBY/MUTE LOGIC 118 LGND RGND Fig.1 Block diagram. OUTL- OUTL+ OUTR- OUTR+ MGB975 1996 May 06 1450Philips Semiconductors Preliminary specification 2x 1 W BTL audio amplifier TDA8542 PINNING FUNCTIONAL DESCRIPTION SYMBOL PIN DESCRIPTION The TDASS4 Ww - he TDA8542(Ty is a 2 x 1 W BTL audio power amplifier LGND . ground, left channel - capable of delivering 2 x 1 W output power to an 8 Q load OUTL+ 2 | positive loudspeaker terminal, at THD = 10% using a 5 V power supply. Using the MODE left channel pin the device can be switched to standby and mute MODE a operating mode select condition. The device is protected by an internal thermal (standby, mute, operating) shutdown protection mechanism. The gain can be set SVR 4 |half supply voltage, decoupling within a range from 6 dB to 30 dB by external feedback ripple rejection resistors. BTL/SE 5 BTL loudspeaker or SE Power amplifier headphone operation nc. 6 | not connected The power amplifier is a Bridge Tied Load (BTL) amplifier . ; OUTRe 3 positive loudspeaker terminal, with a complementary PNP-NPN output stage. The voltage loss on the positive supply line is the saturation right channel voltage of a PNP power transistor, on the negative side the RGND 8 {| ground, right channel saturation voltage of a NPN power transistor. The total Vocr 9 | Supply voltage, right channel voltage loss is <1 V and with a 5 V supply voltage and an OUTR 1) [negative loudspeaker terminal, 8 Q loudspeaker an output power of 1 W can be delivered. right channel 4 . INR- 11 | negative input, right channel Mode select pin INR+ 12 | positive input, right channel The device is in the standby mode (with a very low current ; consumption) if the voltage at the MODE pin is INL+ 13 _| Positive input, teft channel >(Voc ~ 0.5 V), orif this pin is floating. Ata MODE voltage INL- 14 | negative input, left channel level of iess than 0.5 V the amplifier is fully operational. In OUTL 15 | negative loudspeaker terminal, the range between 1.5 V and Vcc 1.5 V the amplifier is left channel in mute condition. The mute condition is useful to suppress Veet 15 | supply voltage, left channel plop noise at the output caused by charging of the input capacitor. Headphone connection A headphone can be connected to the amplifier using two coupling capacitors for each channel. The common _ U GND pin of the headphone is connected to the ground of Lano [7] 18] Vooy the amplifier (see Fig.4). In this case the BTL/SE pin must ouTL+ [2] [15] OUTL~ be either on a logic HIGH level or not connected at all. ModE [3 | [14] iNL~ The two coupling capacitors can be omitted if it is allowed to connect the common GND pin of the headphone jack 3 + sve || TDA8542 33) ine not to ground, but to a voltage level of Vcc. See Fig.5 for BTUSE [6 | [42] INR+ the application diagram. In this case the BTL/SE pin must ne. [el ia} ina be either on a logic LOW level ar connected ta ground. If the BTL/SE pin is on a LOW level, the power amplifier for ouTR+ [7 | [10] outR- the positive loudspeaker terminal is always in mute RGND [6 | r2] Voor condition. MGB974 Fig.2 Pin configuration. 1996 May 06 1451Philips Semiconductors Preliminary specification 2x 1W BTL audio amplifier TDA8542 LIMITING VALUES In accordance with the Absolute Maximum Rating System (IEC 134). SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT Vec supply voltage operating -0.3 18 Vv Vv, input voltage -0.3 Veco + 0.3 |V lonm repetitive peak output current - 1 A Tstg storage temperature non-operating | -55 150 C Tamb operating ambient temperature -40 85 C Vpse AG and DC short-circuit safe voltage - 10 Vv Prot total power dissipation SO16 - 1.2 WwW DIP16 - 2.2 Ww QUALITY SPECIFICATION In accordance with SNW-FQ-611-E. The number of the quality specification can be found in the Quality Reference Handbook. The handbook can be ordered using the code 9397 750 00192. THERMAL CHARACTERISTICS SYMBOL PARAMETER VALUE UNIT Rt j-a thermal resistance from junction to ambient in free air: TDA8542T (SOi6L) 100 KAV TDA8542 (DIP 16) 55 KAW 1996 May 06 1452Philips Semiconductors Preliminary specification 2x 1W BTL audio amplifier TDA8542 DC CHARACTERISTICS Voc = 5 Vi Tamb = 25 C; Ri = 8 Q; Vong = 0 V; measured in test circuit Fig.3; unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT Vec supply voltage operating 2.2 5 18 Vv Iq quiescent current Ri = -; note 1 - 15 22 mA Istb standby current Veopve = Vcc ~ - 10 LA Vo DC output voltage note 2 - 22 ~ Vv |Vouts Vout-! | differential output voltage offset - ~ 50 mV Vines ine input bias current - - 500 nA VMobDE input voltage mode select operating 0 - 0.5 Vv mute 15 - Voo-1.5]V standby Vee - 0.5] - Voc Vv IMODE input current mode select 0 <Veope < Vec |- - 20 LA Ves input voltage BTL/SE pin single ended 0 - 0.6 Vv BTL 2 - Vec Vv Ips input current BTL/SE pin Ves =0 - - 100 pA Notes 1. With a load connected at the outputs the quiescent current will increase, the maximum of this increase being equal to the DC output offset voltage divided by R:. 2. The DC output voltage with respect to ground is approximately 0.5 x Voc. 1996 May 06 1453Philips Semiconductors Preliminary specification 2x 1W BTL audio amplifier TDA8542 AC CHARACTERISTICS Voc = 5 V; Tamp = 25 C; Ry = 8 Q; f= 1 KHZ; Vaope = 0 V; measured in test circuit Fig.3; unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT Po output power THD = 10% 1 1.2 - Ww THD = 0.5% 0.6 0.9 - Ww THD total harmonic distortion Po=0.5W - 0.15 0.3 % Gy closed loop voltage gain note 1 6 - 30 dB Zi differential input impedance - 100 - kQ Vaio noise output voltage note 2 - ~ 100 uV SVRR supply voltage ripple rejection note 3 50 - - dB note 4 40 - - dB Vo output voltage in mute condition | note 5 ~ - 200 pV Qos channel separation 40 - - dB Notes 1. Gain of the amplifier is 2 x R2/R1 in test circuit of Fig.3. 2. The noise output voltage is measured at the output in a frequency range from 20 Hz to 20 kHz (unweighted), with a source impedance of Rg = 0 2 at the input. 3. Supply voltage npple rejection is measured at the output, with a source impedance of Rs = 0 2 at the input. The ripple voltage is a sine wave with a frequency of 1 kHz and an amplitude of 100 mV (RMS), which is applied to the positive supply rail. 4. Supply voltage nipple rejection is measured at the output, with a source impedance of Rs = 0 at the input. The ripple voltage is a sine wave with a frequency between 100 Hz and 20 kHz and an amplitude of 100 mV (RMS), which is applied to the positive supply rail. 5. Output voltage in mute position is measured with a 1 V (RMS) input voltage in a bandwidth of 20 kHz, so including noise. 1996 May 06Philips Semiconductors Preliminary specification 2x 1W BTL audio amplifier TDA8542 TEST AND APPLICATION INFORMATION vy Los sles oe T 100 nF T 100 pF TUF 10kQ INL+} 4 15 , Vib +] cg Ry ouTR Les OUTL+ ba A4 I uF 2] 50 ka eo net OUTR TUF 10K INR+|,. TDABS42 10; Vin AL Ba 7 |OUTRe SvAl MODE] , L O=ON - BTLSE], 1 = standby 1 8 MGB979 LGND RGND , GND Left gain = 2 x A2/A1 = 10 (20 dB): Right gain = 2 x R4/R3 = 10 (20 dB). {1) Reducing the value of C3 results in a decrease in performances of SVAR at low frequencies. Fig.3 BTL application and test circuit. Left gain = R2/A1 = 5; Right gain = R4/A3 = 5. Vo Voce | [Necr i $00 nF 3 F Le, F Cr) " OUTL- THF 10kQ INL+ 13 sr Ly Vit TR +L cat |r ou 47 pfOUTL+ common. | headphone AA L AF - 2320 c2 ong 50kQ : $+ INF} 54 ouTA-_ 42 tpF 10kQ INF+l,2 TDABS42 10; in 220yF 7 }QUTA+ SVR , > MODE} , O=ON BIUSE! 1 = standby i 8 MGB977 LGND RGND , GND (1) Reducing the value of C3 results in a decrease in performance of SVRR at low frequencies. Fig.4 Single-ended headphone application. 1996 May 06 1455Philips Semiconductors Preliminary specification 2x 1W BTL audio amplifier TDA8542 [von Lo ado 9 I 100 nF T 100 pF OUTL- , Vv THF 10kQ INL+] 45 15 IL + C3) OUTR- 7 OQUTL+ common headphone R4 HF 2 -_ 2~32Q oe R3 50 kQ , INR R Keo 1 ouTR- V tpF 10k INR+ 12 TDA8542 10 IR 7 OUTR+ Vv SVR 4 > MODE 3 0=O0N BTL/SE 5 1 = standby 1 8 masere LGND RGND , GND Left gain = R2/R1 = 5; Right gain = R4/R3 = 5. (1) Reducing the value of C3 results in a decrease in performance of SVAR at low frequencies. Fig.5 Headphone application without coupling capacitors. Voc OUTL- Voc | |Yocr Loe Les c 16 8 100 n 0 INL~ Vin 14 QUTL- , 15 Vent NJ OUTR- OUTL+ 2 INR- Vin to. WW 19 (QUTRE Viet NRT TAB 42 7 OUTR+ ci! i SVR 4 47 uF MODE 3 0=ON BTLISE| , 1 = standby 1 8 MGB978 LGND RGND I GND (1) Reducing the value of C1 results in a decrease in performance of SVAR at low frequencies. Fig.6 Motor drive application. 1996 May 06 1456