UCC39421NG4

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UCC39421NG4 Application Field and Working Principle:

UCC39421NG4 is a DC-DC switching controller specially designed for applications such as ATX motherboard, high power battery charger and other consumer electronics. It integrates all the features needed to control a dc-dc switching power supply, including precision voltage regulation, power conversion, current limit protection and over temperature protection. Although the use of UCC39421NG4 is mainly limited to consumer electronics and ATX motherboard, but other applications are still possible.

This device is based on a non-isolated buck converter topology, which is an efficient and cost-effective way to convert one DC voltage level to another, and to provide a stable output voltage with its excellent regulatory accuracy. The voltage range of the input voltage is as wide as 4.5V to 32V, while the output voltage could be adjusted within a range of 0.8V to 28V. This feature enabled the UCC39421NG4 to be used in almost any environment.

UCC39421NG4 can be employed in a variety of applications, including battery charger, ATX motherboard, DC-DC converters, and in different communication technologies. UCC39421NG4 can also be used to power various components in consumer products like smartphones, tablets and other device. In addition to that, it can also be used in automotive and industrial applications.

The operating principle of the UCC39421NG4 is straightforward. It takes an input voltage from the battery, regulates it using an error amplifier and switches between the MOSFETs to deliver the desired output voltage. The internal control loop consists of a voltage reference, an error amplifier, a PWM comparator, and a logic circuit.

The voltage reference and error amplifier take the difference between the output voltage and the reference voltage and the error amplifier has a gain setting that allows the user to adjust the amount of current sent to the PWM comparator. The PWM comparator connected to MOSFETs that act as a switch to control the voltage of the output.

The logic circuit, also known as a "slope control" circuit, is used to control the switching times of the MOSFET switches, which helps to reduce the noise produced by the PWM. In addition it also has current limit protection, over-temperature protection and soft-start features.

The UCC39421NG4 is an ideal solution for applications that need high efficiency, reliable output voltage and built-in protection features. It is a great choice for DC-DC converters, ATX motherboard, high power battery charger and other consumer electronics.

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