SC189ZULTRT Integrated Circuits (ICs)

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The SC189ZULTRT is a DC-DC switching regulator from Texas Instruments offering superior quality, performance, and reliability. It is a variable-frequency, synchronous-rectified, pulse transformer-isolated voltage regulator that provides low-voltage, high-current power conversion. The SC189ZULTRT is designed to generate output voltages as low as 0.2 V and as high as 15 V. It provides high efficiency, fast dynamic response, and low output ripple. The SC189ZULTRT is especially suitable for applications such as industrial automation, telecom, consumer electronics, and automotive.

The SC189ZULTRT is based on a power topology known as theisolated "power-factor-correction" type of converter. This topology is highly efficient over a wide range of load conditions, making it ideal for applications that require very low output voltages and high-current output levels. The SC189ZULTRT uses two power supplies, a high-voltage primary side and a low-voltage secondary side, to isolate the input and output powers. The transformer acts as the interface between these power supplies, ensuring galvanic isolation. The transformer also helps in maintaining an optimum power factor while providing ultralow output ripple.

The SC189ZULTRT employs a current mode control scheme to regulate the output voltage. A key component of the regulator is its integrated feeding crane, which helps create a robust, highly efficient power conversion process. The feeding crane\'s operation is based on the principle of synchronous rectification. To this end, the feeding crane switches the main power switch at the zero-voltage crossing point of the inductor current waveform, resulting in low power losses and minimal EMI.

Supply voltage variability rejection, open loop output voltage accuracy, and other important aspects of the SC189ZULTRT are also managed by its two regulation loops. Its inner loop is a fixed-frequency voltage-mode control loop, and its outer loop is a high-speed, current-mode control loop that offers excellent line-voltage rejection capability. The regulator offers user-programmable line-voltage and current-sense thresholds, which can be adjusted to match the application\'s specific requirements. Additionally, the SC189ZULTRT has patented short-circuit protection that automatically shuts down the main power switch if the output current exceeds a certain level.

In addition to its features, the SC189ZULTRT offers a wide-ranging operating temperature range of -40 °C to +85 °C. The regulator\'s low profile and small footprint make it suitable for space-constrained applications. It is also backwards-compatible with the previous versions of the device, making it easy to upgrade existing designs.

The SC189ZULTRT is a versatile DC-DC switching regulator suitable for a variety of applications. Its efficient power-factor-correction topology, wide operating temperature range, advanced control loops, and patented short-circuit protection make it a great choice for applications that require very low output voltages and high-current output levels.

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