A stereo audio power amplifier is an electronic device that improves the sound quality of an audio system or instrument by amplifying the signal from a low level to a high level. So these amplifiers include two output channels that receive stereo o/p signal from some audio device & send it to the connected speakers to the amplifiers. These amplifiers are very popular in different conditions and situations, used at the office or home to amplify the signal from TVs, DVDs, or CD players. Thus, there are various types of stereo audio power amplifier ICs available in the market like; TEA2025 IC, CD4440 IC, TDA2002V, TDA2030A, etc. This article explores about CD4440 IC, pinout, specifications, working, and its applications.
What is CD4440 IC?
The CD4440 stereo audio power amplifier IC and housed in a 14-pin Single In-line Package. It includes two channels where the maximum o/p power of every channel is about 6 watts so, it can provide 6W of output power to the speakers under the correct voltage supply & load impedance conditions.
This IC has an in-built audio muting function and protection circuits that protect from surge voltage, over-voltage, pin-to-pin, and thermal voltage. The max operating voltage of this IC is 18V, the voltage supply is 13.2V & the surge voltage supply is 50V. Thus, this IC has 6Watts of output power in dual mode & 19Wats power in bridge mode. The CD4440 IC is used in a wide range of audio-based applications for bridge and stereo amplification.
Working
The CD4440 IC works in two amplification modes; stereo mode and bridge-push-pull mode. So in stereo mode, this IC provides amplification mainly for the right and left channels separately. Similarly in Bridge-Push-Pull or BTL mode, it connects two channels mainly into amplified single output to provide maximum output power. So this mode is very useful for various applications that need high-volume in-car audio systems.
CD4440 IC Pin Configuration:
The pin configuration of CD4440 IC is shown below. This IC includes 14 pins and each pin and its functionality is discussed below.
CD4440 IC Pin Configuration
- Pin-1, 2, 4 & 9 (NC): These are not connected pins.
- Pin-3 (VCC): It is a power supply pin.
- Pin-8 (IN2+): It is a positive input of channel 2.
- Pin-10 (BTL/SE): It is a BTL/SE mode select pin.
- Pin-11 (GND): It is a ground pin.
- Pin-5 (IN1-): It is a negative input pin of channel-l.
- Pin-12 (MUTE): It is a mute control pin.
- Pin-6 (IN1+): It is a positive input of channel-1.
- Pin-13 (STBY): It is a standby control pin.
- Pin-7 (IN2-): It is a negative input pin of channel-2.
- Pin-14 (OUT): It is an output pin.
Features & Specifications:
The features and specifications of CD4440 IC include the following.
- The CD4440 IC is a dual-channel power amplifier.
- It includes 14 pins and is available in the FSIP14 package.
- The typical o/p power of this IC is 6 watts for each channel within stereo mode.
- This IC provides 19 watts higher output power for every channel in BTL mode.
- The CD4440 IC is designed mainly to reduce the number of required external components by simplifying the design & assembly of the circuit.
- When the power is turned on & off, the noise produced is extremely small, thus it will not affect the quality of the audio significantly.
- This IC has an excellent Ripple Rejection Ratio which assists in maintaining the clarity & exactness of the output audio.
- It has good channel isolation thus; it helps to ensure exact stereo sound separation.
- This IC has less input noise with correct circuit settings, thus it helps to provide very clear audio output.
- It exhibits less distortion, so it maintains good-quality audio sound.
- This IC design can be combined easily with the cooling plate to ensure sure correct temperature throughout operation.
- This IC has an internal mute function, so it can mute the audio output when required.
- CD4440 IC integrates various protection functions like overvoltage protection, thermal protection, short circuit protection, and impact voltage protection between circuit pins.
- Its supply voltage is 13.2V
- Its surge voltage supply is 50V.
- The ripple rejection ratio is 46dB.
- Allowable power dissipation is 15W
- Its quiescent current ranges from 100 to 200mA.
- Its maximum operating voltage is 18V.
- Operating temperature ranges from -20°C to 75°C.
Equivalent & Other ICs
The equivalent CD4440 IC is LA4440 IC and other audio amplifier ICs are; LM386, TDA2003, LM3886, CD4504, TDA7388, PAM8610, TDS7294, TDA1554, TDA7294, TDA2030, TDA7265, TDA2005, TDA7279, TDA2002, etc.
CD4440 IC Audio Amplifier Circuit
The CD4440 IC audio amplifier circuit with volume control is shown below. This amplifier circuit is designed with some external components that deliver stereo output (6 Watts + 6 Watts) through two 4Ω loudspeakers.
The power supply for this circuit is very significant, by providing suitable bias we can make sure of high gain and high efficiency. So, a 12V/1A power supply is provided to CD4440 IC so that it exhibits high fidelity & low distortion audio reproduction. This IC is suitable in a broad spectrum of audio applications because of the wide frequency response that ranges from 20 Hz to 20 KHz.
He required components to make this circuit include; capacitors like; C5, C6, C7 & C12 100μF/35V, 4.7μF/35V C3 & C4, 220μF/35V C8 & C1, 0.1μF C9 & C11,1000μF/35V C1, 100μF/35V C2, 2KΩ R1 & R2 resistors, LA4440, LEFT1 & RIGHT1 speaker, 12V/1A J1 and J2 screw terminal. Connect this circuit as per the diagram shown below.
CD4440 IC Audio Amplifier Circuit
Working
This IC needs external capacitors only for its operation and R1, and R2 resistors provide GND balance to the RIGHT and LEF audio input. The electrolytic capacitors are used in this circuit with 35-volt voltage ratings. Here, VCC pin-11 is connected to the +12V power supply whereas the Ground (-) supply is connected to Pins 3, 8 & 14. So the C1 capacitor is used for bias filtering purposes by connecting across the +12V & GND line.
In the above circuit, audio input LEFT is simply connected to the Pin-6 (IN2) through C3 4.7µF capacitor whereas the RIGHT input is connected to the Pin-2 (IN1) through C4 4.7µF capacitor. Similarly, the pin-10 (OUT2) is connected simply to the LEFT speaker whereas the pin-12 (OUT1) is connected to the RIGHT speaker with a 220µF capacitor. So here a 0.1µF capacitor is used for noise filtering by connecting across the loudspeaker terminals.
Finally, by applying bias & input audio voice, we can listen to the 6W+6W amplified audio o/p through two loudspeakers. Thus, this circuit volume can be controlled by introducing two variable resistors within the audio input.
Advantages & Disadvantages
The advantages of CD4440 IC include the following.
- CD4440 IC has in-built power protection, good ripple rejection, small residual noise & special pin-to-pin protection feature.
- It is a dual-channel and monolithic audio amplifier IC.
- This IC has 46dB of good ripple rejection, less residual noise, and inbuilt protection from surge voltage and over-voltage.
- It has less distortion, good channel separation, less residual noise, and an in-built audio mixing function.
- It has a little pop noise whenever the power supply is switched on/off.
- It has a good starting balance
- It needs less number of external components.
The disadvantages of CD4440 IC include the following.
- These ICs are delicate and, thus cannot withstand high-voltage operation.
- These have a limited rating of power.
Applications
The applications of CD4440 IC include the following.
- The CD4440 stereo audio amplifier IC is used in different applications like home audio systems, car audio systems, portable audio devices, TV sound systems, DIY audio projects, etc.
- This IC excels in handy audio devices like; MP3 players, radios, and Bluetooth speakers to enhance volume and its quality significantly.
- CD4440 IC is used in stereo & bridge amplification applications.
- It is frequently used in different audio amplifier applications because of its stereo power amplification abilities & features.
- This IC can be utilized to drive speakers within portable audio devices like; MP3 players, Bluetooth speakers, and portable radios by providing superior volume output and sound quality.
- It is used in small desktop speaker systems, educational projects, public address systems, musical instruments, gaming consoles, industrial audio, etc.
Please refer to this link for the CD4440 or LA4440 IC Datasheet.
Thus, this is all about an overview of CD4440 IC, pinout, features, specifications, circuit, working, advantages, disadvantages, and applications. So this is a stereo audio power amplifier chip developed by TI (Texas Instruments) and is mainly designed to provide amplification for audio signals. Here is a question for you, what is TEA2025 IC?