Texas Instruments UCC2809-2 Economy Primary Side Controller UCC2809D-2G4

The UCC2809D-2G4 is part of the UCC2809 family of low-power integrated circuits designed for off-line and isolated DC-to-DC fixed frequency current mode switching power supplies. It features a user-programmable soft start with active low shutdown, a maximum duty cycle that can be set by external components, and an accessible 5V reference output. The device operates at frequencies up to 1MHz and includes undervoltage lockout (UVLO) functionality. This part can source up to 0.4A and sink up to 0.8A, making it suitable for driving N-channel MOSFETs. The startup current is low, at 100µA, which is beneficial for energy-efficient designs. The UCC2809D-2G4 is available in multiple package options, including SOIC-8, PDIP, TSSOP, and MSOP, allowing for flexibility in board design, especially in space-constrained applications. Engineers looking for a compact and efficient solution for power supply designs may find the UCC2809D-2G4 a suitable choice due to its integrated features and low external component requirements.