UCC2580N-2

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UCC2580N-2 Application Field and Working Principle

UCC2580N-2 is a Pulse-Width-Modulation(PWM), low power offline switcher featuring primary side regulation, UVLO and integrated current Limiting. This device is designed for Universal Offline Flyback Converters used in off-line applications such as Telecom, Dect, Battery-Chargers, TV and SMPS working in both PFC/PWM applications. UCC2580N-2 belongs to the PMIC - AC/DC Converters, Offline Switchers category.

Features

• Primary-Side Regulation (PSR) allows the elimination of opto-couplers and TL431, enhancing system reliability
• Integrated 300V Begins-of-cycle switch reduces converter Standby Power
• Integrated Voltage Controlled Oscillator (VCO) with selectable switching frequency up to 400 kHz
• Integrated line detection eliminates the need of an external resistor
• Integrated Dynamic Advance Ramp Compensator (DARC) allows high input power factor operation and drastically reduces EMI
• Integrated primary-side protection includes line under-voltage protection (LVP), Brown-Out protection, load Protection and overload protection features
• Two Different Start-up current options to accommodate different converter sizes

Application

• Telecom Power Supplies
• DECT Power Supplies
• Battery Chargers
• TV Power Supplies
• SMPS for PFC and PWM applications

Working Principle

The UCC2580N-2 PWM control IC is an integrated device that combines both primary and secondary feedback controls as well as integrated line and load protection. The Universal Offline Flyback converter works in duty mode control and uses the switching duty cycle as the control parameter. The duty cycle is determined by the voltage feedback comparison between a reference voltage, Vref, and the p-side current transient detection. In auto-restart mode, the PWM is active when the line sense voltage exceeds the under-voltage lockout threshold, while in the active burst mode, the PWM is active only when the drain-source voltage of the MOSFET exceeds a fixed hysteresis voltage level. The built-in overvoltage protection circuit monitors the output voltage during high load transients preventing the output voltage exceeding limits and potentially damaging the power supply.

The UCC2580N-2 PWM controller features a VCC-controlled oscillator (VCO) with a maximum frequency of 400 kHz. The output of the VCO is used to drive the synchronous rectifier MOSFET and the input of the SR MOSFET is the VCC-controlled oscillator’s inverted output. The PWM control IC also has a 300V Begins-of-Cycle switch which enables higher power efficiency and lower standby power. The built-in line detection circuit eliminates the need for an external resistor as well as a high voltage start-up circuit that includes two different start-up current options for different load application. The combination of these features makes the UCC2580N-2 PWM control IC an ideal choice for designing low power offline switchers.

Conclusion

UCC2580N-2 is a highly integrated PWM low power offline switcher featuring primary side regulation, UVLO, integrated current limiting, line detection, and advanced regulators. This device is perfect for SWPS in both PFC/PWM applications such as Telecom, DECT, Battery Chargers, TV, and SMPS. The combination of advanced features makes the UCC2580N-2 PWM Control IC an ideal choice for designing low power offline switchers.

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