UC3715N

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The UC3715N integrated circuit is an advanced monolithic pulse-width modulation (PWM) controller specifically designed and optimized for high-efficiency switched-mode power supply (SMPS) applications. It is a member of Texas Instruments\' family of general purpose power-supply circuits, and is designed to handle the duties of driving gate ON/OFF signals of power MOSFETs and other switching devices. The IC provides an integrated solution in demanding applications including switch-mode AC-to-DC and DC-to-DC converters, battery chargers, and self-powered applications. With its bidirectional peak-current-mode architecture and many integrated safety features, the UC3715N can be used in a wide range of on/off control applications, such as low-power lighting control, adjustable switching regulators, and motor control systems.

The UC3715N has a wide operating range of 5.5V to 24V, with a 400mV to 560mV sensing voltage range. It is also capable of accepting a wide range of operating frequencies and is available in a variety of package options, from 8-pin DIP to 8-pin SOIC. The device integrates overvoltage, undervoltage, overtemperature, and fast-clamp circuitry, providing robust protection in all applications.

The UC3715N has a built-in charge pump which is used to drive the internal high-side switch near unity when operating in high-side current-regulating mode. This charge pump also biases the internal balanced low-side driver in the low-side regulation mode. The low-side FET driver provides a rail-to-rail logic-level output with a maximum swing of up to 7V and a minimum swing of 5V, making it suitable for the most demanding switching applications.

The UC3715N operates in a peak-current-mode architecture, providing high accuracy and resolution of PWM current loads. It also provides fast transient response and cycle-by-cycle overcurrent protection. When using this mode of operation, the output current is monitored by an internal high-speed comparator which triggers pulses with adjustable duty cycles when the output current exceeds the set levels. Therefore, the current regulation accuracy of the device is independent of ambient temperature, input supply voltage and load voltage.

The UC3715N is designed to operate in one of two modes -- low-side or high-side current regulation. In low-side current regulation mode, the controller regulates the current flowing through the low-side switch. In high-side current regulation mode, the controller regulates the current flowing through the high-side switch. Additionally, the device can operate in retry mode, which is useful for driving asynchronous motors by providing periodic on/off switching of the high-side switch.

The UC3715N is a versatile, high-efficiency, driver-integrated device providing an excellent solution for a wide range of power-supply applications. It has a wide range of features such as a built-in charge pump, over-voltage, under-voltage, overtemperature and fast-clamp circuitry that offer robust protection and reliable performance. Its peak-current-mode architecture and adjustable operating frequency result in high accuracy, fast response time and cycle-by-cycle overcurrent protection.

In conclusion, the UC3715N integrated circuit is a robust and reliable integrated driver, designed to provide the highest efficiency and reliability in demanding applications such as low-power lighting control, adjustable switching regulators, and motor control systems. It has a wide operating range, high-speed current regulation, fast transient response, and many integrated safety features, making it an ideal choice for a wide range of on/off control applications.

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