TI UCC28722DBVR

The UCC28722 flyback power supply controller provides constant voltage (CV) and constant current (CC) output regulation for individual outputs without the use of an optocoupler. This device processes information from the primary-side power switch and the auxiliary flyback winding to precisely control the output voltage and current. It can dynamically control the operating state and customize the modulation profile, enabling efficient operation under all load conditions without compromising the output transient response. The control algorithm employed by the UCC28722 allows the operating efficiency to meet or exceed current standards. The output driver interface is connected to a bipolar transistor power switch, enabling a low-cost converter design. The discontinuous conduction mode (DCM) with valley switching reduces switching losses. Modulating the switching frequency and the primary-side peak current amplitude (FM and AM) maintains high conversion efficiency across the entire load and line range. The maximum switching frequency of this controller is 80kHz, and it always maintains control over the peak primary-side current in the transformer. Output overvoltage and overcurrent as well as input undervoltage protection features help suppress stress components on both the primary and secondary sides. Additionally, the UCC28722 can compensate for the voltage drop in the cable by setting an external resistor.

• No-load power consumption below 50mW
• Primary-Side Regulation (PSR) eliminates the need for an optocoupler
• Dynamic BJT drive
• ±5% voltage and current regulation for line and load
• 80kHz maximum switching frequency for high power density charger design
• Quasi-resonant valley switching for maximum overall efficiency
• Wide VDD range allows use of small bias capacitors
• Output overvoltage, low-line, and overcurrent protection
• Programmable cable compensation
• SOT23-6 package

• USB-compatible adapters and chargers for consumer electronics
• Smartphones
• Tablet PCs
• Camcorders
• Standby power supplies for TVs and desktop computers
• White goods