![]() ![]() The protection circuit protects the SMPS as well as the associated load. Protection circuits: There are various protection circuits that can be employed in a SMPS for a safe and reliable operation. We used low ESR capacitor of 105-degree rating from Wurth Electronics and the expected output ripple seems to below. However, SMPS output ripple is highly dependent on the SMPS construction, the PCB and the type of capacitor are used. The targeted ripple voltage is the same for this SMPS, less than 30mV pk-pk ripple. Output ripple voltage: It is highly desired that a good power supply has a ripple voltage of less than 30mV pk-pk. Also, the output voltage will be constant and steady at the lowest input voltage with maximum load (2A) across the output. Since this SMPS will provide constant voltage irrespective of the load current, it will work on CV (Constant Voltage) mode. Output specification: The output voltage is selected as 12V with 1A of 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: This will be an SMPS in AC to DC conversion domain. Therefore, proper specification analysis needs to be done before proceeding with the actual design. This SMPS is also having a specification. Same as like previous SMPS based project, different kinds of power supply works in different environments and works in a specific input-output boundary. VIPer22A Power Supply Design Specifications This tutorial will take you through the complete circuit and will also explain how to build your own transformer for VIPER circuit. In this project we will build another 12V 1A SMPS circuit using the VIPer22A, which is a popular low cost SMPS driver IC from STMicroelectronics. We even did build our own SMPS transformer that could be used in our SMPS designs along with the driver IC. We have already built few SMPS circuits earlier like this 5V 2A SMPS circuit and 12V 1A TNY268 SMPS circuit. ![]() This type of AC-DC converters takes in the 230V/110V AC mains voltage as input and converts it to low level DC voltage by switching it, hence the name switch mode power supply. Switched mode power supply circuits (SMPS) are most often in required in many electronic designs to convert the AC mains voltage to suitable level of DC voltage for the device to operate. ![]()
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