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SMPS Transformer Calculator

This calculator will help you to design an SMPS circuit by calculating the primary turns, secondary turns, and core selection based on the input voltage, the output voltage, the switching frequency and the power requirements. Flyback Transformer Calculator Flyback Transformer Calculator Input Voltage (V): Output Voltage (V): Switching Frequency (kHz): Core Cross-Section Area (mm²): Max […]

Make this 220V to 12V SMPS Using UC2842 IC

Last Updated on March 29, 2025 by Swagatam Leave a Comment

This UC2842 IC based SMPS design is simple, cheap and efficient kind of isolated power supply. We can use it in off-line stuff like AC-DC adapters, battery chargers and all those small power supplies. What is cool? It takes that high voltage AC then steps it down and then keeps input and output fully isolated […]

Filed Under: Power Supply Circuits Tagged With: 12V, 220V, SMPS, UC2842

The Role of Inductor Coil in SMPS

Last Updated on January 8, 2024 by Swagatam 21 Comments

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The most crucial element of a switched mode converter or an SMPS is the inductor. Energy is stored in the form of a magnetic field in the core material of the inductor during the brief ON period (ton) switched through the connected switching element such as MOSFET or a BJT. How the Inductor Works in […]

Filed Under: Electronics Theory Tagged With: Coil, Inductor, Role, SMPS

How to Repair a Switch-Mode-Power-Supply (SMPS)

Last Updated on January 8, 2024 by Swagatam 113 Comments

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In this post we try to diagnose a burnt SMPS circuit and try to troubleshoot and repair the circuit. The shown unit is a cheap readymade Chinese make SMPS circuit. This article is written as per the request made by Mr. Kesava. My SMPS got Burnt The below attachment is 12v 1.3 amps  SMPS for […]

Filed Under: Power Supply Circuits Tagged With: Mode, Power, Repair, SMPS, Supply, Switch

110V, 14V, 5V SMPS Circuit – Detailed Diagrams with Illustrations

Last Updated on January 18, 2025 by Swagatam 29 Comments

smps

In this post I have explained how to apply the IC L6565 for making a compact multi purpose 110V, 14V, 5V SMPS circuit using minimum number of external components. Implementing quasi-resonant ZVS flyback The IC L6565 from ST Microelectronics is designed as a current-mode primary controller chip, to specifically suit quasi-resonant ZVS flyback converter applications. The […]

Filed Under: Power Supply Circuits Tagged With: 110V, 14V, Detailed, Diagrams, Illustrations, SMPS

2 Compact 12V 2 Amp SMPS Circuit for LED Driver

Last Updated on January 19, 2025 by Swagatam 49 Comments

smps

In this post I will comprehensively discuss a 2  simple 12V 2 amp SMPS circuit using the IC UC2842. We study a 2 amp flyback design by evaluating various formulas, which provides the exact selection details for the transformer winding and the parts specifications. Design#1: Introduction The first design is based on the versatile IC VIPer53-E. […]

Filed Under: Power Supply Circuits Tagged With: 12V, Compact, Driver, LED, SMPS

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