![]() In return to control the output voltage of SMPS. The voltage control method used a feedback voltage by comparing it with a reference value to set a duty cycle of PWM. There are two types of PWM controller integrated circuits: I will discuss these things in detail later in this article. ![]() These PWM controllers ICs you can use very easily in your SMPS projects by connecting some external circuitry with them according to the selection of frequency. ![]() There are many PWM ( Pulse width modulation ) controller integrated circuits available in the market just like SG3525. Therefore, Pulse width modulation is a preferred technique for control circuits of switch-mode power supplies. Pulse width modulation also resolves the issues which occur in Pulse frequency modulation. The width of the pulse or on time increase with the increase in load. On the other hand in Pulse width modulation technique frequency remains constant but the width of pulse changes with the change in load. But the Pulse frequency modulation technique causes some issues in switch-mode power supplies. In Pulse frequency modulation technique on time of pulse remains constant but the frequency increases with the increase in load. Control-Integrated circuit for SMPS SG3525: Pulse frequency modulation and pulse width modulation are two types of techniques used in control integrated circuits for switch-mode power supplies.
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