SI8250DK

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The SI8250DK is an integrated circuit (IC) package for DC/DC and AC/DC (off-line) switching mode power supplies (SMPS). This device from Silicon Labs integrates all the necessary regulation and control functions onto a single chip, making it an ideal solution for creating cost-effective and efficient power systems. In this article, we will explore the application fields and working principle of the SI8250DK.

The SI8250DK is mainly used in off-line SMPS applications, such as adapters, chargers, LED drivers, and power supplies, where high efficiency at a low system cost is required. It is also very suitable for applications with high noise tolerance requirements and strict EMI requirements. The device is specifically designed for applications with low power density, small footprints, and high efficiency designs.

The device is a 100 V buck converter with integrated features such as line feed forward, valley switching, and cycle-by-cycle current limit. It also includes an active current sharing feature that provides a high dynamic current limit at light loads. The device provides a wide operating range, 735 V to 330 V continuous VOUT adjustment range, and up to 98.5 % efficiency. It is also capable of delivering up to 1.7 A of output current across a wide input voltage range from 5.5 V to 12 V.

The SI8250DK features a high-density logic-based solution. The advanced digital system architecture enables accurate digital control of power line voltages, output current, and device protection. It also enables the use of advanced control and protection features such as system monitoring, over-temperature protection, and voltage monitoring. The device also comes with a system status register and additional safety features.

The SI8250DK features an on-board single-cycle precision voltage regulator (SVR) which provides protection against surges and voltage transients. The SVR actively monitors each cycle for peak voltage anomalies, and responds immediately to limit the voltage rise. The device also provides under-voltage protection (UVP) and overvoltage protection (OVP) for system protection.

The device also includes a variety of integrated features, such as a power scaling architecture, adjustable start/stop frequency, output voltage control, and over-temperature protection. It also has an enhanced overload protection feature (EOP) which monitors the peak current for each switching cycle. The SI8250DK has low shutdown current consumption, allowing the device to remain in a standby mode with minimal power consumption. Additionally, the device has an adjustable fault condition detection time, allowing maximum design flexibility in selecting the correct values.

The SI8250DK features a compact 5.9 mm × 9.8 mm QFN package and requires minimal external components. This makes it very suitable for applications requiring a small form factor and a low component count. The device is also RoHS compliant, making it suitable for use in both commercial and automotive applications. Overall, the SI8250DK is an efficient, cost-effective, and fully integrated IC package for DC/DC and AC/DC (off-line) SMPS applications. It provides numerous integrated features, a high-density logic-based solution, and a compact form factor with minimal external components required. The device is highly suitable for applications with low power density, small footprints, and high efficiency designs, making it an excellent choice for a wide range of off-line applications.

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