LT3976EMSE#TRPBF

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Analog Devices’ LT3976EMSE#TRPBF is one of their switch mode DC/DC current regulators, integrated into a single easy-to-use package. This device is versatile, as it can be used for a range of applications. In this article, we will look at the application field and working principle of the LT3976EMSE#TRPBF

Application Field

The LT3976EMSE#TRPBF is able to provide wide input and output voltage range. This makes it suitable for a variety of systems and applications which require step-down and step-up switching converters. It is especially suitable for driving LED strings, as it is current-mode controlled, and can deliver up to 1.5A of continuous output current. Additionally, its adjustable switching frequency allows the optimization of performance, size, and noise for the system.

Other applications of the LT3976EMSE#TRPBF include battery-powered systems, such as portable and handheld devices, where the wide input voltage range allows all types of battery to be used. Furthermore, this IC is capable of ripple regulation, constant frequency and fixed off-time switching, which makes it suitable for point of load applications, such as FPGA and DSPs, with high current and wide input and output voltage ranges.

Working Principle

The LT3976EMSE#TRPBF is designed to act as a current regulator, with an output current that is dependent on the input voltage, the output voltage, and the current sense voltage. In short, the LT3976EMSE#TRPBF works by monitoring the input voltage, and comparing this to the regulated output voltage. When the output voltage is lower than the regulated output voltage, the IC increases the power switch conduction time, thereby increasing the output current. Conversely, when the output voltage is higher than the regulated output voltage, the IC decreases the power switch conduction time to reduce the output current.

To ensure that the output current is accurately regulated, the LT3976EMSE#TRPBF utilizes its integrated current sense amplifier to sense the voltage drop that is created due to the output current across the current sense resistor. This voltage is then fed into the IC\'s current sense inputs, in order to allow the IC to monitor the output current. If the current sense voltage exceeds the threshold set by the reset level pin, then the IC will shut off the power switch conduction, thus decreasing the output current.

Overall, the LT3976EMSE#TRPBF is a versatile IC, offering a wide input voltage range and adjustable switching frequency, making it suitable for a wide range of applications. It accurately regulates the output current by monitoring the input voltage and the current sense voltage, and then controlling the power switch conduction time accordingly.

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