The KA3525A is a versatile pulse-width modulation (PWM) controller IC designed for use in switch-mode power supplies (SMPS), DC-DC converters, and motor control systems. Originally manufactured by Fairchild (now part of ON Semiconductor), and available from other suppliers as well, the KA3525A is known for its flexibility, precision control features, and suitability for both forward and push-pull converter topologies.
The KA3525A integrates a precision 5V voltage reference, an error amplifier, an oscillator, pulse-width modulation comparator, and dual totem-pole output drivers, all housed in a standard 16-pin DIP or SOIC package. It supports adjustable oscillator frequency up to several hundred kilohertz, making it suitable for high-frequency power supply designs. The IC includes features such as soft start, dead-time control, current limiting, and shutdown capability, providing comprehensive protection and control for reliable power conversion.
Each output driver can directly drive power MOSFETs or BJTs, simplifying the design of efficient switching stages. The device operates over a typical supply voltage range of 8V to 35V, offering broad application flexibility.
Overall, the KA3525A is a powerful and widely used PWM controller IC that offers precision, reliability, and ease of implementation, making it a staple choice in modern power electronics for both professional and hobbyist designers.
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