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INTEGRATED CIRCUITS
DATA SHEET
TDA7056A 3 W BTL mono audio output amplifier with DC volume control
Product specificiation File under Integrated Circuits, IC01 July 1994
Philips Semiconductors
Product specificiation
3 W BTL mono audio output amplifier with DC volume control
FEATURES • DC volume control • Few external components • Mute mode • Thermal protection • Short-circuit proof • No switch-on and off clicks • Good overall stability • Low power consumption • Low HF radiation • ESD protected on all pins. QUICK REFERENCE DATA SYMBOL VP PO Gv φ IP THD PARAMETER positive supply voltage range output power voltage gain gain control range total quiescent current total harmonic distortion VP = 12 V; RL = ∞ VP = 0.5 W RL = 16 Ω; VP = 12 V CONDITIONS 3 34.5 75 − − MIN. 4.5 − 3.5 35.5 80 8 0.3 TYP. GENERAL DESCRIPTION
TDA7056A
The TDA7056A is a mono BTL output amplifier with DC volume control. It is designed for use in TV and monitors, but also suitable for battery-fed portable recorders and radios. Missing Current Limiter (MCL) A MCL protection circuits is built-in. The MCL circuit is activated when the difference in current between the output terminal of each amplifier exceeds 100 mA (typical 300 mA). This level of 100 mA allows for headphone applications (single-ended).
MAX. 18 − 36.5 − 16 1
UNIT V W dB dB mA %
ORDERING INFORMATION EXTENDED TYPE NUMBER TDA7056A Note 1. SOT110-1; 1996 August 21. PACKAGE PINS 9 PIN POSITION SIL MATERIAL plastic CODE SOT110
July 1994
2
Philips Semiconductors
Product specificiation
3 W BTL mono audio output amplifier with DC volume control
TDA7056A
VP
handbook, full pagewidth
2 n.c. n.c. 1 9
TDA7056A
I + i 6 positive output
positive input DC volume control
3 5
I – i
8
negative output
STABILIZER Vref
TEMPERATURE PROTECTION
4
7
MGA072 - 1
signal ground
power ground
Fig.1 Block diagram.
PINNING SYMBOL n.c. VP VI GND1 VC OUT+ GND2 OUT− n.c. PIN 1 2 3 4 5 6 7 8 9 DESCRIPTION not connected positive supply voltage voltage input signal ground DC volume control positive output power ground negative output not connected
VC OUT+ GND2 OUT− n.c.
handbook, halfpage
n.c. VP VI GND1
1 2 3 4 5 6 7 8 9
MGA071
TDA7056A
Fig.2 Pin configuration.
July 1994
3
Philips Semiconductors
Product specificiation
3 W BTL mono audio output amplifier with DC volume control
FUNCTIONAL DESCRIPTION The TDA7056A is a mono BTL output amplifier with DC volume control, designed for use in TV and monitor 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 capacitor to keep the offset voltage low. In the TDA7056A the DC volume stage is integrated into the input stage so that coupling capacitors are not required and a low offset voltage is maintained. At the same time the minimum supply voltage remains low. The BTL principle offers the following advantages: • lower peak value of the supply current • the frequency of the ripple on the supply voltage is twice the signal frequency
TDA7056A
Thus, a reduced power supply and 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. The maximum gain of the amplifier is fixed at 35.5 dB. The DC volume control stage has a logarithmic control characteristic. The total gain can be controlled from 35.5 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, VP and across the load. A thermal protection circuit is also implemented. If the crystal temperature rises above +150 °C the gain will be reduced, thereby reducing the output power. Special attention is given to switch-on and off clicks, low HF radiation and a good overall stability.
LIMITING VALUES In accordance with the Absolute Maximum System (IEC 134). SYMBOL VP IORM IOSM Ptot Tamb Tstg Tvj Tsc V3 V5 PARAMETER supply voltage range repetitive peak output current non repetitive peak output current total power dissipation operating ambient temperature range storage temperature range virtual junction temperature short-circuit time input voltage pin 3 input voltage pin 5 Tcase < 60 °C CONDITIONS − − − − −40 −55 − − − − MIN. MAX. 18 1.25 1.5 9 +85 +150 +150 1 8 8 UNIT V A A W °C °C °C hr V V
THERMAL RESISTANCE SYMBOL Rth j-a Rth j-c from junction to case PARAMETER from junction to ambient in free air THERMAL RESISTANCE 55 K/W 10 K/W
Note to the thermal resistance VP = 12 V; RL = 16 Ω; The maximum sine-wave dissipation is = 1.8 W. The Rth vj-a of the package is 55 K/W; Tamb (max) = 150 − 55 x 1.8 = 51 °C
July 1994
4
Philips Semiconductors
Product specificiation
3 W BTL mono audio output amplifier with DC volume control
CHARACTERISTICS VP = 12 V; f = 1 kHz; RL = 16 Ω; Tamb = 25 °C; unle.