tda2002 lowest supply voltage - Electronic Circuits Projects Diagrams Free

Thunderchild · 7th August 2006, 06:50 AM

I want to make a little portable amplifier and have a tda2002 and was woundering if say at 6 volts I would still get anything out of it.

audioguru · 7th August 2006, 01:30 PM

The TDA2002 is made for a supply voltage of 14.4V. Philips and ST Micro have more than 100 class-AB audio amplifier ICs and some work perfectly at 6V. A 6V battery drops to only 4V during its life.
The datasheet for the TDA2002 shows that its quiescent current drops with less supply voltage so it probably makes crossover distortion. It has a graph of power output vs supply voltage and its output power is very distorted (10% distortion) and only 1.4W into 4 ohms with an 8V supply. It might be only 1/2W at clipping into 4 ohms with a 6V supply.

Years ago I made a portable stereo amp with National Semi's LM2896 as a bridged amp. It was bootstrapped for low voltage loss and produced 5.5W per channel into 4 ohms with a 7.5V set of 6 Ni-Cads. The LM2896 isn't made anymore but newer ICs are similar.

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7th August 2006, 06:50 AM	(permalink)
Thunderchild	tda2002 lowest supply voltage I want to make a little portable amplifier and have a tda2002 and was woundering if say at 6 volts I would still get anything out of it. __________________ I AM the exeption that disproves the rule in many ways but the rules still apply (unfortunately) my site:www.simons-photography.com http://rushdenrotaract.org.uk

7th August 2006, 01:30 PM	(permalink)
audioguru	The TDA2002 is made for a supply voltage of 14.4V. Philips and ST Micro have more than 100 class-AB audio amplifier ICs and some work perfectly at 6V. A 6V battery drops to only 4V during its life. The datasheet for the TDA2002 shows that its quiescent current drops with less supply voltage so it probably makes crossover distortion. It has a graph of power output vs supply voltage and its output power is very distorted (10% distortion) and only 1.4W into 4 ohms with an 8V supply. It might be only 1/2W at clipping into 4 ohms with a 6V supply. Years ago I made a portable stereo amp with National Semi's LM2896 as a bridged amp. It was bootstrapped for low voltage loss and produced 5.5W per channel into 4 ohms with a 7.5V set of 6 Ni-Cads. The LM2896 isn't made anymore but newer ICs are similar. __________________ Uncle $crooge