LT1575CN8-3.5#PBF

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The LT1575CN8-3.5#PBF is a linear regulator controller from a family of voltage regulators/linear regulator controllers manufactured by Linear Technology. It is a powerful and efficinet regulator controller, designed for use in a wide range of applications.

Features

The LT1575CN8-3.5#PBF has the following features:

• Current-mode operation
• Operates with supplies from 10V to 32V
• Adjustable voltage output as low as 1.25V
• Adjustable frequency (250kHz to 2.5MHz)
• Programmable Soft-start and Stop Options
• Undervoltage Protection
• Overcurrent Limit Protection

Application Fields

Given its features, the LT1575CN8-3.5#PBF can be used in a variety of applications and different industrial applications. The most common applications of the controller include:

• Battery chargers
• Power converters
• Power inverters
• DC/DC voltage converters
• DC/AC voltage converters
• Power supplies

Working Principle

The LT1575CN8-3.5#PBF is a current mode regulator controller. This means up to stable operating point, the output current is limited by a resistor and the inductor. The X1 loop of the regulator accounts for voltage regulation, while the X2 loop is used for current regulation. The X1 loop can be used to set the output voltage of the regulator, wihle the X2 loop is used to set the inductor current and the inductor current is limited by the current sense resistor.

Once the inductor current reaches the current sense threshold, the X2 loop is triggered, activating the internal MOSFETS. This increases the voltage of the output and creates a stable operating point. The X1 loop then takes over, regulating the output voltage by sensing the feedback voltage, which is compared against the reference voltage supplied by the LT1575CN8-3.5#PBF.

Once the output voltage is regulated, the LT1575CN8-3.5#PBF uses the X2 loop to control the inductor current. The controller will shut down if the inductor current exceeds the current sense threshold. The LT1575CN8-3.5#PBF also includes various protection circuits and measures, such as undervoltage protection and overcurrent limit protection, which help ensure the controller is operating within defined safety limits.

Conclusion

The Linear Technology LT1575CN8-3.5#PBF is a versatile and powerful regulator controller, suitable for use in a variety of applications. It utilises current mode regulation and includes various protection circuits, as well as adjustable output voltages and frequency. This makes the controller an excellent choice for a broad range of components and applications.

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