Philips Semiconductor Introduces the TEA1507 GreenChip II Controller IC

Philips Semiconductor (Sunnyvale, CA) recently introduced the TEA1507 GreenChip II, their second generation of green switched-mode power supply controller ICs operating directly from the rectified universal mains. The new multi-chip module consists of two ICs. While the high-voltage BCD chip works directly from the rectified mains voltage, a second low-voltage BiCMOS IC is used for protection functions and control. The TEA1507 is designed to be situated at the primary side of a flyback converter where an auxiliary winding of the transformer is used for demagnetization protection and powering the IC after start-up.

Philips Semiconductor claims that the built-in green functions of the TEA1507 allow the efficiency to be optimum at all power levels, and that this holds for quasi-resonant operation at high power levels, as well as fixed-frequency operation with valley switching at medium power levels.

Features of the GreenChip II controller include universal mains supply operation from 70Vac to 276Vac, a high level of integration, and on-chip start-up current sources. Protection features include safe restart mode for system fault conditions, continuous mode protection, adjustable over-voltage protection, short winding protection and under-voltage protection. Additionally, the TEA1507 has over-temperature protection, an adjustable over-current protection trip level and soft restart.

Applications for the new device include TV and monitor supplies, as well as all applications that demand a solution up to 250W.