If you are wondering what that is, you can think of it as a comparator that controls the increase or decrease of the duty cycle for the “feedback” that you associate with Pulse Width Modulation (PWM). Pins 1 (Inverting Input) and 2 (Non Inverting Input) are the inputs to the on-board error amplifier. This is for instance a site with explanations: Įverything is clear except for what pins 1 and 2 exactly do. My goal is to post purely conceptual and practical knowledge.I want to build a PWM circuit and it seems the SG3525 is a good candidate for the job, however I don't completely understand all pins and I can't find any comprehensible info (for my skill level) on the internet. Pin11 Pin14: These both pins are output pin of IC with totem pole output means if we apply these output to MOSFET there is no need of MOSFET driver. Pin 10(shut down ) IF shut down pin low it will work and if shut down pin is logic high It means that it is connected with 5 volts it will remain in shut down mode. Pin 9(comp) It is a compensation pin that is used with feedback to avoid the rapid change in output voltage due to load change. The capacitor that is connected with this pin and ground determines the level of the soft start process. Pin 8 (soft starter) It is used for starting the operation of IC softly. Pin 4 is the output of the oscillator Pin5 Pin6 Pin 5 (ct) and Pin 6 (rt) are together used for setting the frequency of PWM.įrequency formula is f 1 CT (.7 RT 3 discharge) Pin 7 We can use this pin for setting the dead time of IC it means the dead time between pulses. Pin 3 Pin 4 Pin 3 is sync that is used for synchronizing IC with an external oscillator. While when the voltage on the inverting pin decreases then the non inverting pin duty cycle increases. When the voltage on inverting pin that is pin 1 increases the voltage than pin 2 that is non inverting pin duty cycle decreases. This onboard amplifier is a comparator that controls the duty cycle of PWM.
This PWM IC is used in DC to AC inverter, DC to AC converter, Power supplies, solar inverter, and many other applications. To learn more, see our tips on writing great answers.įeatures The main feature of sg3525 is adjustable frequency and adjustable duty cycle. Making statements based on opinion back them up with references or personal experience. Provide details and share your research But avoid Asking for help, clarification, or responding to other answers.
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