Philips Semiconductors RF Communications Products Objective specification 1-Watt low voltage audio power amp with DC volume control TDA7052A/AT eee reer rere reer eee eee FEATURES GENERAL DESCRIPTION DC volume control The TDA70S2A/AT are mono BTL * Few external components output amplifiers with DC volume control. They are designed for use in * Mute mode TV and monitors, but also suitable Thermal protection for battery-fed portable recorders Short-circuit proof and radios. e No switch on and off clicks * Good overall stability ORDERING INFORMATION e Low power consumption EXTENDED PACKAGE * Low HF radiation TYPE NUMBER | pins | PIN POSITION | MATERIAL CODE * ESD protected on all pins TDA7052A 8 DIL plastic SOT97 TDA7052AT 8 mini-pack plastic SOT96A QUICK REFERENCE DATA SYMBOL PARAMETERS CONDITIONS MIN. TYP. MAX. UNIT Vp supply voltage range 45 - 18 v Po output power in 8 Q (TDA7052A) Vp=6V 1 141 - Ww in 16 Q (TDA7052AT) Vp=6V 05 0.55 - Ww G, maximum total voltage gain 35 36 37 oB o gain control range 75 80 ~ dB Ip total quiescent current Vp=6V;R, =< - 6 12 mA THD total harmonic distortion Po =0.5W - 0.2 1 % August 1991 170Philips Semiconductors RF Communications Products 1-Watt low voltage audio power amp with DC volume control Objective specification TDA7O52A/AT FUNCTIONAL DESCRIPTION The TDA7052A/AT are mono BTL output amplifiers with DC volume control, designed for use in TV and monitors but also suitable for battery fed portable recorders and radios. In conventional DC volume circuits the control or input stage is AC coupled to the output stage via external capacitors to keep the offset voltage low. In the TDA7052A/AT the DC volume control stage is integrated into the input stage so that no coupling capacitors are required and yeta low offset voltage is maintained. At the same time the minimum supply remains low. LIMITING VALUES The BTL principle offers the following advantages: e Lower peak value of the supply current The frequency of the ripple on the supply voltage is twice the signal frequency. Thus a reduced power supply with smaller capacitors can be used which results in cost savings. For portable applications there is a trend to decrease the supply voltage, resulting in a reduction of output power at conventional output stages. Using the BTL principle increases the output power. In accordance with the Absolute Maximum System (IEC 134) The maximum gain of the amplifier is fixed at 36 dB. The DC volume control stage has a logarithmic control characteristic. The total gain can be controlled from 36 dB to -44 dB. If the DC volume control voltage is below 0.3 V, the device switches to the mute mode. The amplifier is short-circuit proof to ground and V,. Also a thermal protection circuit is implemented. If the crystal temperature rises above 150 C the gain will be reduced, so the output power is reduced. Special attention is given to switch on and off clicks, low HF radiation and a good overall stability. SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT Vp supply voltage range - 18 Vv lonw repetitive peak output current - 1 A losm non-repetitive peak output current - 1.5 A Prt total power dissipation Tam & 25% TDA7052A - 1.25 W TDA7052AT - 0.64 Ww Tamb operating ambient temperature range -40 85 a} Tag storage temperature range -55 150 C Ty virtual junction temperature - 150 C To. short-circuit time - 1 hr Vv, input voltage pin 2 - 8 Vv V4 input voltage pin 4 - 8 Vv August 1991 171Philips Semiconductors RF Communications Products Objective specification 1-Watt low voltage audio power amp with DC TDA7052A/AT volume control THERMAL RESISTANCE SYMBOL PARAMETER TYP. MAX. UNIT Rin j-a from junction to ambient in free air TDA7052A - 100 KW TDA7052AT - 155 KW Note TDA7052A: Vp =6 V;R, = 8 Q. The maximum sine-wave dissipation is 0.9 W. Therefore Tarymax) = 150- 100 x 0.9 = 60C. TDA7OS2AT: Vp = 6 V; R, = 16.9. The maximum sine-wave dissipation is 0.46 W. Therefore Tareymaxy = 150 - 155 x 0.46 = 78 C. August 1991 172Philips Semiconductors RF Communications Products. Objective specification 1-Watt low voltage audio power amp with DC volume control TDA7052A/AT CHARACTERISTICS Vp = 6 V; Tam = 25 C; f = 1 kHz; unless otherwise specified (see Fig.6). TDA7052A: R, = 8 22; TDA7O52AT: R, = 16 Q; SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT Vp supply voltage range 4.5 - 18 Vv lp total quiescent current Ve=6V;RL=2 ~ 6 12 mA note 1 Maximum gain; V,= 1.4 V Po output power THD = 10% TDA7052A 1 Ww - Ww TDA7052AT 0.5 0.55 - Ww THD total harmonic distortion TDA7052A Po=0.5W - 0.2 1 % TDA7052AT Py = 0.25 W - 0.2 1 % q voltage gain 35 36 37 dB Vv, input signal handling V,=1V; THD < 1% 0.6 - - V V no(rma) noise output voltage (RMS f = 500 kHz, - tof - pV value) note 2 B bandwidth - 20Hzto |- 20 kHz RR ripple rejection note 3 40 - - dB onl DC output offset voltage - tof 150 mV Z, input impedance (pin 2) 15 20 26 kQ Minimum gain; V,=0.5 V G, voltage gain - 44 - dB Votre) noise output voltage RMS note 4 - 20 30 uv value) Mute position Vo | output voltage in mute position [V.<0.3V;Vi=600mv |- |- ES uv DC volume control o gain control range 75 80 - dB l, control current V,=0.4V tbf 65 tof HA Notes to the characteristics 1. With a load connected to the outputs the quiescent current will increase, the maximum value of this increase being equal to the DC output offset voltage dividend by R,. 2. The noise output voltage (RMS value) at f = 500 kHz is measured with R, = 0 2 and bandwidth = 5 kHz. 3. The ripple rejection is measured with R, = 0 Q and f = 100 Hz to 10 kHz. The ripple voltage of 200 mV, (RMS value) is applied to the positive supply rail. 4. The noise output voltage (RMS-value) is measured with R, = 5 kQ unweighted. August 1991 173Philips Semiconductors RF Communications Products 1-Watt low voltage audio power amp with DC volume contro! Objective specification TDA7OS2A/AT Fig.3 Gain control as a function of DC volume control. Vnvise (nV) 800 600 400 200 MCD389 1000 Vy) Fig.4 Noise output voltage as a function of DC volume control. MCD390 Fig.5 Control current as a function of DC volume control. August 1991 174Philips Semiconductors RF Communications Products Objective specification 1-Watt low voltage audio power amp with DC TDA7O52A/AT volume control APPLICATION INFORMATION 0 Vv, 6Vv = t 100 nF Be HF 1 n.c. _ TDA7052A TDA7052AT eaieil | s| 4 positive 0.47 pF : 4 : input 1 : Z Rj -80 4 PN (TDA7052A) or I R,=162 (TDA7052A/AT) ag [su g + !) STABILIZER | TEMPERATURE Fig.6 Test and application diagram. ret | PROTECTION Dc - oOo volume 3 6 controi > MCD386 ground (1) This capacitor can be omitted if the 220 pF electrolytic capacitor is connected close to pin 1. August 1991 175Philips Semiconductors RF Communications Products 1-Watt low voltage audio power amp with DC volume control August 1991 100 kQ MCD387 volume control Fig.7 Application with potentiometer as volume control; maximum gain = 30 dB. 176 Objective specification TDA7OS52A/AT