UCC28C40DGK

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The UCC28C40DGK chip is a power management integrated circuit (PMIC) controller specifically optimized for highly efficient, high-density Off-Line switched-mode power supplies up to 300 W. It can be used to replace multiple dedicated components, lowering system cost and reducing development time. This makes it a great choice for a number of applications that demand well-managed power systems, such as consumer electronics, LED lighting, gaming systems, industrial and medical systems, telecom and datacom equipment. This article will discuss the application field and working principle of the UCC28C40DGK in detail.

Applications

The UCC28C40DGK comes in an SOP-8 package and is designed with a current-mode control architecture, meaning it can maintain a maximum core efficiency of up to 95%. It offers a wide input voltage range of 85 VAC to 265 VAC as well as current-mode control operation with a frequency range of 10 kHz to 300 kHz. This makes it suitable for a range of applications, including desktop power supplies, laptops, workstations, industrial offline EMI-compliant applications, white goods, and communications systems.

In consumer electronics, the UCC28C40DGK can be used to control power supplies for items such as HDTVs and audio systems. The current-mode control and minimum component design allow for a more compact and lightweight product design. Meanwhile, the high-efficiency operation ensures cooler running and longer power supply life. It can also be used for LED lighting applications, where the wide input voltage range and high precision output enable superior brightness control and excellent light quality.

The chip is also suitable for gaming systems, industrial, and medical applications. The rugged design and wide temperature range mean the UCC28C40DGK can handle harsh conditions, while the integrated protection features provide fail-safe operation. Finally, the chip can be used in telecom and datacom equipment, providing reliable and cost-efficient conversion over a wide range of frequencies.

Working Principle

The working principle of the UCC28C40DGK is based on its current-mode control architecture. The controller regulates current and voltage flows by sensing the currents flowing out of it and maintaining the output voltage according to the set threshold. It accomplishes this through a simple but effective loop consisting of a Sense Resistor, Current Sense Amplifier, Comparator, and Flip-Flop.

The Sense Resistor is placed in series with the load, allowing the current flowing through it to be monitored. The Current Sense Amplifier amplifies the current sense signal from the Sense Resistor and passes it on to the Comparator. Based on the set threshold, the Comparator compares the amplified signal to the proportional voltage divider, and the result is then either held in the Flip-Flop or inverted. The Flip-Flop acts as a latch, providing power to the switching MOSFETs according to the current flow and the set threshold.

The UCC28C40DGK also has integrated protection features to protect against a variety of conditions, such as overvoltage protection, overcurrent protection and thermal shutdown. The controller also features an oscillator circuit that can be used to generate a wide range of switching frequencies, allowing for variability in the output voltage. This flexibility makes the UCC28C40DGK an ideal choice for applications that require high-efficiency, high-density off-line switched-mode power supplies.

Conclusion

In summary, the UCC28C40DGK is a power management integrated circuit (PMIC) controller designed for highly efficient and high-density off-line switched-mode power supplies. Its current-mode control and integrated protection features make it suitable for a wide range of applications in desktop power supplies, LED lighting, gaming systems, industrial and medical systems, and telecom/datacom equipment. This makes it a great choice for designers who need a reliable yet cost-effective regulator for their power supply designs.

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