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DC DC Switching Controllers

S-8521F32MC-BPRT2U

The S-8521F32MC-BPRT2U (hereinafter referred to as S-8521F) is a DC-DC switching regulator controller manufactured by IXYS Corporation. It is designed to deliver optimal current efficiency, silent operation, and a wide input voltage range for various power applications. It is a highly integrated, low-power device that offers excellent power conversion efficiency, temperature monitoring and protection, and soft start.

Application Field

The S-8521F is a monolithic switching controller ideal for battery powered applications such as cell phones, cameras, and PDAs. Its wide input voltage range from 4.5V to 30V and its high-efficiency built-in power stages make it perfect for powering high power LCDs, RF transceiver modules, WLANs, and other portable systems.

The S-8521F is also suitable for LED lighting applications, as its design features a high current capacity to drive up to 5 LEDs. Its high conversion efficiency and its wide input voltage range make it ideal for PoE (Power over Ethernet) applications.

Working Principle

The S-8521F is a highly integrated DC-DC switching regulator controller which operates by controlling the duty cycles of the switching elements. The regulator is comprised of two main stages, the control circuit and the power stage. The control circuit is responsible for setting the input voltage level and loading the power stage with the desired output current.

The control circuit consists of a voltage sense block, a feedback loop, an oscillator, and a driver block. The voltage sense block measures the input voltage and compares it to the reference voltage. The comparison is used to adjust the duty cycle of the oscillator, which in turn modulates the output of the power stage. The output of the power stage is then fed into a feedback loop which adjusts the voltage sense block to maintain the output at the desired level. Thus, the S-8521F is able to provide a constant output voltage despite input variations.

The power stage of the S-8521F consists of two MOSFETs connected in a push-pull arrangement. The gate of each MOSFET is connected to the driver block, which activates and deactivates the MOSFETs depending on the duty cycle determined by the control circuit. As one MOSFET is activated, it allows current to pass through it, charging the output capacitor. When the other MOSFET is activated, it allows current to pass through it, discharging the output capacitor. This switching action produces a steady output voltage despite the input variations.

Conclusion

In conclusion, the S-8521F is a highly integrated DC-DC switching regulator controller which offers excellent power conversion efficiency, temperature monitoring, and soft start. Its wide input voltage range makes it ideal for applications such as digital cameras, PDAs, and LED lighting. Its design and performance features make it a perfect choice for providing efficient, silent and reliable operation in any power application.

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