S8519BF

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S8519BF is a power conversion IC primarily used as a boost power converter. With both a high-side and a low-side drive output solution, an internal synchronous rectifier, and an internal PWM modulator, it is used in many applications where a boost converter is required. The IC is rated for up to 8A of output current, and works across a wide input voltage range of 2.4V to 40V. It also has excellent efficiency and output performance, making it a suitable choice for many power-related applications.

Applications of S8519BF include DC-DC boost converters, AC-DC boost converters, chargers, LED lighting drivers, and other power related applications. It can also act as a voltage regulator in certain applications. Some of its features include Wide input voltage range 2.4V-40v, High-side and low-side drive output solution, Internal synchronous rectifier, Current mode PWM controller, Thermal shutdown protection, Cycle-by-cycle current limit and Safe-operating area protection.

The working principle of S8519BF is based on the internal high-voltage PWM controller which is controlled by an internal oscillator and an external reference voltage. The PWM controller modulates the output voltage to regulate the output voltage to the set value. The high-voltage PWM controller drives the high side and the low side drivers alternately to create the boost converter voltage conversion. Meanwhile, an internal synchronous rectifier is used to reduce the switching losses and an external current sense resistors is used for current-mode control loop. The output voltage is monitored by a feedback voltage comparator which can stay in the regulation loop to control the output voltage of the boost converter.

In summary, S8519BF is an ideal choice for applications such as DC-DC boost converters and AC-DC boost converters, and has wide input voltage range, current mode PWM controller, and synchronous rectifier. It is capable of providing a stable output voltage even under varying supply conditions. Its performance, stability and reliability make it a suitable choice for many power related applications.

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