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You are here: Home / Audio and Amplifier Projects / 3.7 V Class-D Speaker Amplifier Circuit for Differential Analog Input

3.7 V Class-D Speaker Amplifier Circuit for Differential Analog Input

Last Updated on May 5, 2022 by Swagatam 6 Comments

caution electricity can be dangerous

A class D amplifier is basically a category of amplifier in which the power devices (mosfets and BJTs) are operated like switches.

The associated output devices in such amplifier circuits either turn fully ON or fully OFF, but never switch between other undefined levels ensuring minimal heat dissipation and maximum efficiency from the devices.

The working of these amplifier circuits may be understood as follows:

How it Works

An opamp based comparator comes into play whose inputs are fed with two signals, one is the music signal which needs to be amplified while the other is a sample high frequency triangle wave signal.

The opamp is forced to compare and assess the music signal with the sample triangle waves and produce an output which may be assumed to be exactly proportionate and in tandem to the original music signal but in a PWM or a pulse width modulated form.

This music equivalent PWM is further amplified by the adjoining power mosfet or BJT stages in order to reproduce a crystal clear music which may be an exact replica of the fed music and achieved without much heating up of the mosfets.

This allows comparatively lower amps to be consumed than the conventional form of amplifiers coming in other categories such as class A/B/C etc.

One such IC which is designed to perform a class D type of amplification is the IC BD5460 which does not even require an external choke LC filter for the operations. Usually an inductor filter becomes essential with most class D amplifier topologies for minimizing the accompanied harmonics and similar disturbances.

Technical Specifications

The chip becomes ideally suitable for mini handheld audio devices such as in cellphones, IPods, Ipads, FM radios etc.

The IC is specified with an output power of about 2 watts at 3.7V. The range of the input power could be from 2.5 V to 6.5 V DC.

The IC also enjoys other built in features like a standby function, short circuit protection, thermal shutdown and under voltage lockout feature.

A couple of class D amplifier circuits using the IC BD5460 can be witnessed in the following diagrams. The left hand side design is differential input based amplifier, while the right hand side depicts a single ended topology. All the 0.1uF capacitors are configured as input decoupling filters.

Circuit Diagram

More info about the IC BD BD5460 may be acquired from the following datasheet of the IC.

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About Swagatam

I am an electronic engineer (dipIETE ), hobbyist, inventor, schematic/PCB designer, manufacturer. I am also the founder of the website: https://www.homemade-circuits.com/, where I love sharing my innovative circuit ideas and tutorials.
If you have any circuit related query, you may interact through comments, I'll be most happy to help!

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Comments

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  1. brod says

    August 24, 2014

    I want to buy power amp ic's ,with o/t power between 4 to 7 watt and cost within 200Rs.so which one can i try?

    Reply
    • Swagatam says

      August 24, 2014

      i have no idea about it, you'll have to check it online…

      Reply
  2. Ram says

    August 22, 2014

    Is IC BD5460 coming on smd package only ?

    Reply
    • Swagatam says

      August 22, 2014

      not sure, please check the info in its datasheet by googling the device number

      Reply
    • Irshad Qalandary says

      December 28, 2015

      Sir Give me a audio circuit diagram (with 4 inch speaker and headphone jack with usb cable as power option). what components are required to build this circuit.

      Reply
    • Swagatam says

      December 28, 2015

      Irshad, you can a try an LM386 IC circuit for your requirement, as shown below:

      https://www.homemade-circuits.com/2012/08/ic-lm-386-datasheet-explained-in-simple.html

      Reply

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