Monday, September 8, 2014

Car Audio Using TDA1516

Good evening everyone. Hope everyone is doing great. 

Now I'm going to write something about a circuit that can be used in car and also can be used in anywhere. The very positive thing about this amplifier circuit is, it runs from 12V DC that means you can use it in car, directly powering it from the lead acid battery or you can use it in any outdoor situation using sealed lead acid or lead acid battery or you can use it in your home powering it up from an computer power supply. Most amplifiers require high voltage to run so they can't be powered by the computer power supply but with this diagram you can do that. I have a plan to make this type of amplifier directly in a computer case, one day.

Enough chit-chat let's dive into the project, the integrated circuit that I'm going to use is the TDA1516, cool thing about this chip is you can use it as Bridge Tied Load amplifier or just stereo amplifier and this chip requires very few external components which makes it very simple to work with.

In this particular diagram I will be using the bridge tied load configuration so it will be mono. Obviously you will be needing stereo so just make two of these identical copies. With 12V supply this will deliver around 20W which is enough for most applications.

The IC

A 13 pin SIL(single in line) package IC.



How it works:

A very simple diagram. TDA1516 is an integrated class B amplifier that comes in a 13 lead single in line package. As I mentioned above this is diagram will employ a bridge tied load configuration so it is mono and has only one input. Now to wire it as a BTL(Bridge tied load) we need to give the input to inverting input of one amplifier and non inverting input of other amplifier, main goal of BTL is to increase the voltage swing, this configuration will allow us to do so.

Pin #2 and #13 are two of those input pins. A 1uF or .22uF capacitor can be used as decoupling capacitor.

Pin #1 is actually a non inverting input, as its a BTL amplifier this pin is connected to a reference voltage which is the Pin # 4.

Pin # 3 and #7 are used as signal ground and power ground. Which will be simply tied to the ground reference point or the 0V point or simply the negative terminal of the supply.

Pin #5 and #9 are two outputs from two internal amplifiers and this is where we will connect the loud speaker.

Pin #11 is a stand by switch. 

Pin #10 is for the positive voltage input pin. It will be hooked up to the positive terminal of the power supply.

Pin #6 and #8 are used for bootstrapping. I'm not going to get in depth of what it is, you can learn more about it here. These two pins will be directly connected to the positive supply.

Stereo Application:

Like I said before this IC is great for stereo too, although in stereo mode it will give only 5W per channel on 4ohm speaker and 12V supply voltage. Still That application may come in handy.

To use it as a stereo amplifier all you have to do is to connect the Pin #2 and Pin #4 and stereo input will be given to Pin #1 and Pin #13. These two pins won't be connected anything other than the input. Input capacitors are needed. And stereo output will be given to Pin #5 and Pin #9 respectively. Use output capacitor of about 1000uF. And then it will act as a stereo amplifier.

A few positive things about this diagram:

1. Flexibility in use - either BTL mono or stereo. Wider voltage range of about 6V-18V.

2. High output power even from low voltage.

3. Fixed gain.

4. Short circuit, thermal and reverse polarity protection.

5. Requires very few external components.


Must use a good quality heat sink with the IC and make this on a good quality printed circuit board. 

That's all. Good luck building this. Keep experimenting.

TDA1516 Datasheet.

Read my other posts here.

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