Also, to deal with EMI issues, a common mode filter will be used for blanking out the generated EMI. For this SMPS, input surge protection will be used with a maximum operating input voltage of 275VAC. Depending on the type, the protection circuit can be connected across input or output. The protection circuit protects the SMPS as well as the associated load. Protection circuits: There are various protection circuits that can be used to design an SMPS circuit, to make the operation safe and reliable. Also, the output voltage will be fixed at 12V rated.
This SMPS will provide constant voltage irrespective of the load current, it will work in CV (Constant Voltage) mode. Output specification: We will set the output voltage to 12V with a 2.2A of the current rating. It is also the standard voltage rating of India. So, the input AC voltage of this SMPS will be 220-240VAC. It is as per the European standard voltage rating. In this project, the input voltage is fixed. Input specification: Our SMPS will work on AC to DC conversion domain. As we will see, it makes it suitable for many different applications. These integrated circuits feature a trimmed oscillator for precise duty cycle control, a temperature compensated reference, a high gain error amplifier, a current sensing comparator, and a high current totem pole output for driving a Power MOSFET. The UC3843 is a fixed frequency-mode PWM controller, it is specially designed for Off-Line and DC to DC converter applications with minimum external components.
UC3843 Based Power Supply Design Specification This tutorial will take you through the complete circuit and will also explain how to build your transformer for the UC3843 circuit. In this project, we will build another 12V 2.2A SMPS circuit using the UC3843 Current Mode PWM Controller IC, which is a popular low-cost SMPS driver IC. We even did a project on how to build our own SMPS transformer that could be used in our SMPS designs along with the driver IC. We have already built a few SMPS circuits earlier like 5V 2A SMPS circuit and 12V 1A TNY268 SMPS circuit. This type of AC-DC converter takes in the 230V/110V AC mains voltage as input and converts it to low-level DC voltage with the help of the switching process, hence the name switch mode power supply. Switched-mode power supply circuits (SMPS) are most often required in many electronic designs to convert the AC mains voltage to a suitable level of DC voltage for the device to operate. Switching Mode Power Supply or simply SMPS is a type of Power Supply Unit (PSU) that uses a switching device (such as transistor or MOSFET) to convert the source that can be AC or DC to a constant DC voltage.
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