UCC2580N-3

Introduction

UCC2580N-3 is a high efficiency, low-cost, highly integrated DC/DC switching controller from Texas Instruments. The device contains a high-side MOSFET drive output, as well as frequency control logic, soft-start, and over temperature protection circuits.

Application Field

UCC2580N-3 is designed for use in high performance DC-DC converter topologies such as flyback, boost, and buck. Since the internal FET switch is capable of switching frequencies up to 10MHz, the device is well suited for charging applications where a high frequency is desirable. The device is also suitable for use when a low noise switching frequency is required, as the low output noise of the device helps to minimize EMI/RFI emissions.

Working Principle

The UCC2580N-3 operates in an open loop configuration, with an external MOSFET being used to switch the voltage source. The device controls the on/off time of the MOSFET based on a feedback signal given to its comparator. The feedback signal is compared to an internal reference voltage, which is essentially set by the voltage divider from the output voltage. The reference voltage can also be adjusted by an external voltage on the ADJ pin.

When the output voltage is lower than the reference voltage, the comparator will output a high logic level, which will turn on the MOSFET switch. The MOSFET switch will then be held on as long as the output voltage is lower than the reference voltage. Once the output voltage reaches the reference voltage, the comparator will output a low logic level, which will turn off the MOSFET switch.

Control Circuit

The device also contains a control circuit that is responsible for internal operations such as frequency control, soft-start, and over temperature protection. The frequency control feature allows the UCC2580N-3 to adjust the switching frequency based on an external voltage on the ADJ pin. The soft-start feature reduces the inrush current when the device is first turned on, and helps to improve system stability. The over temperature protection helps to prevent damage to the system in case of excessive temperature. In addition, the device is also capable of self-protection in case of an overvoltage, undervoltage, or overtemperature condition.

Conclusion

UCC2580N-3 is a high efficiency, low cost, and highly integrated DC/DC switching controller from Texas Instruments. It is designed for use in high performance DC-DC converter topologies and can operate at frequencies up to 10MHz. The device contains an internal FET switch, control circuit, and over temperature protection, which helps to improve system stability and reliability. UCC2580N-3 is ideal for applications where a low noise, efficient, and cost effective switching controller is required.