CS5173GD8

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As an electronic component, the PMIC (Power Management Integrated Circuit) is especially important for modern electronic products. The Voltage Regulators subcategory is one of the main parts of PMIC, which is indispensable for many electronic products. DC/DC Switching Regulators are one of the important components in Voltage Regulators, and CS5173GD8 is a typical example of this kind of power management circuit. In this article, I will talk about the application field of CS5173GD8, and the working principle of this component.

Application Field of CS5173GD8

The CS5173GD8 is a one-phase synchronous step-down DC/DC switching regulator, which has high efficiency and can provide up to 5A output current. The CS5173GD8 is a high integration component, which combines a 70V MOSFET, high precision voltage reference, current sensing and thermal protection in a thermally enhanced 8-pin package. This component is ideal for various electronic products such as industrial, medical, automotive and communications equipment, because it has the features of wide voltage range, low noise, fast transient response and good load regulation.

Working Principle of CS5173GD8

The CS5173GD8 is a type of one-phase synchronous step-down DC/DC switching regulator, it works in so-called step-down or “buck” mode. In this way, it converts a higher input voltage to a lower output voltage with high efficiency. In operation, the CS5173GD8 uses two stages in order to regulate the output voltage: the pre-regulator stage and the regulating stage.

In the pre-regulation stage, the current through the MOSFET is sampled at the beginning of each switching cycle. The voltage across the sense resistor is then applied to the PWM comparator and compared to the external feedback voltage to control the duty ratio of the switching cycle. During each cycle, the MOSFET is turned ON, and then turned OFF when the voltage across the sense resistor reaches the external feedback voltage.

In the regulating stage, the current is sampled at the end of each cycle and compared to the feedback voltage. During each cycle, the voltage across the sense resistor is monitored. When the voltage across the sense resistor is lower than the feedback voltage, the duty ratio of the MOSFET is reduced to reduce the voltage across the sense resistor, while if the voltage across the sense resistor is too high, the duty ratio of the MOSFET is increased to increase the voltage across the sense resistor.

In conclusion, the CS5173GD8 is an ideal power management solution for a wide range of applications. It provides high efficiency and good load regulation, and can also be used in various industrial, medical, automotive and communications equipment. Thanks to its high integration and two-stage regulation structure, the CS5173GD8 is able to provide accurate and reliable output voltage.

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