Hello everyone I hope you all will be absolutely fine and having fun. Today, I am going to share my knowledge on Introduction to TL494. It supports all of the functions that are necessary for the Pulse Width Modulation (PWM) control circuits. Power supply control is the basic purpose of the TL494 device. It has an output control circuit, a flipflop, dead time comparator, two different error amplifiers, 5V reference voltage, oscillator and a PWM comparator. TL 494 operates properly between the frequency of 1kHz to 300kHz.
The Dead Time Comparator (DTC) provides around 5% of dead time. Both of the error amplifiers display a common-mode voltage from -0.3V to (Vcc-2)V. If we provide a sawtooth wave at the CT terminal and terminate RT to the reference output (Vref), the oscillator will be bypassed. The internal circuit of TL 494 resists the double pulse at the output. TL494 has a wide range of applications e.g. microwave ovens, PCs, washing machines, Solar power inverters, solar microinverters, smoke detectors etc. Further detail about this device will be given later in this tutorial.
Introduction to TL494
TL 494 is a chip that deals with all of the functions required for Pulse Width Modulation (PWM) control circuits. It consists of two error amplifiers, oscillator, flipflop, 5V reference voltage, dead time comparator, PWM comparator etc. The range of the operating frequency for this device is from 1kHz to 300kHz. TL 494 can be used in washing machines, microwave ovens, solar power inverters, solar microinverters, smoke detectors etc.
1. TL494 Pinout
TL494 has 16 pins in total, all of the pins are provided along with their names in the table shown below:
Pin # 1: Non-Inverting Input.
Pin # 2: Inverting Input.
Pin # 3: Feedback.
Pin # 4: Dead Time Control.
Pin # 5: CT.
Pin # 6: RT.
Pin # 7: Ground (GND).
Pin # 8: C1.
Pin # 9: E1.
Pin # 10: E2.
Pin # 11: C2.
Pin # 12: Voltage (Vcc).
Pin # 13: Output Control.
Pin # 14: Reference Voltage.
Pin # 15: Inverting Input.
Pin # 16: Non Inverting Input.
2. TL494 Pin Configuration
The properly labeled diagram for the TL 494 pins is shown in the figure below.
Modified Sine Wave using TL494
Here's a circuit where TL494 is used as a standalone IC to generate modified Sine Wave:
There are several different packages of TL 494, a few of which are given below.
The current and power ratings of TL494 are provided in the table shown below.
The features associated with the device TL494 are provided in the table shown below.
TL494 Internal Block Diagram
The internal block diagram of TL 494 is shown in the figure given below.
TL494 Functional Block Diagram
The functional block diagram of TL 494 is shown in the figure below.
TL 494 has a wide range of applications, a few of which are given below.
AC/DC Power supply.
Solar power inverter.
I will upload its Proteus Simulation soon in this tutorial.
So that is all from the tutorial, Introduction to TL494, I hope you all have enjoyed this exciting tutorial. If you face any sort of problems you can ask me in the comments anytime you want without even feeling any kind of hesitation. I will try my level best to solve your issues in a better way, if possible. Our team is also 24/7 here to entertain you. I will explore different hardware and software sections in my upcoming tutorials and will surely share all of them with all of you as well. So, till then, Take Care :)
I am Syed Zain Nasir, the founder of The Engineering Projects (TEP). I am a
programmer since 2009 before that I just search things, make small projects and now I am sharing my
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