IR3637ASPBF

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The IR3637 is a highly integrated, feature-rich DC-DC switching controller that provides over-current / over-voltage capabilities to provide system protection, as well as a wide range of protections and accuracy to maximize system reliability and safety. This integrated solution is specifically designed to provide a high-performance, cost-effective solution for a broad range of switching polarity and requirements in dc-to-dc converter applications.

Application Field

The IR3637 can be used in a variety of applications, ranging from consumer and industrial applications to tele-communications and aerospace applications. Every application requires different features and different types of control loops, and the IR3637 is designed to meet these requirements. Its superior over-current and over-voltage ratings allow the IR3637 to be used in applications that experience large variations in external conditions or wide operating ranges.

The IR3637 is suitable for flyback, forward and buck/boost converters in applications such as LED lighting, switched mode power supplies (SMPS), distributed power architectures, portable and laptop power sources, automotive power systems, and power management for industrial and communication systems.

Working Principle

The IR3637 operates in fixed frequency, voltage mode architectures. It has integrated primary control loops, such as voltage regulation and current limit protection, as well as secondary control loops like frequency control loop, dead time control loop and switching frequency slew rate control. It also provides various protections to maximize the system reliability and safety.

The regulation of output voltage is achieved through a voltage feedback loop and an error amplifier. The output voltage is set by comparing the internal reference voltage with the feedback voltage at the error amplifier. If the output voltage is too low, the duty cycle is increased until the output voltage reaches the regulation point. If the output voltage is too high, the duty cycle decreases until the output voltage reaches the reference voltage.

The purposes of over-current and over-voltage protection are to ensure system stability and ensure it complies with the required specifications. In order to meet the requirements of over- current protection, a sense resistor can be used to sense the current entering the switching FET and a comparator is used to monitor the voltage across the sense resistor. If the current is over the limit, the comparator will send a signal to the shutdown pin, disabling the MOSFET and preventing the system from overload. For over-voltage protection, a fractional resistor divider can be used to sense the output voltage and if the voltage exceeds the specified limit, the protection circuit will be activated to reduce the duty cycle and thus preventing the system from over-voltage.

In addition to over-current and over-voltage protections, the IR3637 also provides over temperature protection and failsafe protection to maximize system safety. The over temperature protection will be activated when the junction temperature exceeds the specified limit and the failsafe protection will be triggered by the loss of feedback control or voltage overload.

Conclusion

The IR3637 is a high-performance, cost-effective, integrated DC-DC switching controller designed to meet the high energy requirements for applications in a variety of industries. It has built-in primary and secondary control loops, as well as extensive protection features to ensure system reliability and safety. It is suitable for a range of converters, from flyback and forward to buck/boost, and is suitable for LED lighting, switched mode power supplies, distributed power architectures, automotive and industrial power systems, and power management for portable and laptop computers.

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