Quasi-resonant flyback controller offers faster startup

12th April 2017

Alice Matthews

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Datasheet

The 5^th gen of Infineon Technologies' stand alone quasi-resonant flyback controller and integrated power IC CoolSET family has been introduced. The latest development in this family of devices offers improved efficiency, faster startup, and better overall performance under varying load conditions. The new ICs are especially designed for AC/DC switch mode power supplies in a great variety of applications such as aux power for home appliances, server, and industrial SMPS.

The latest 700 and 800V CoolMOS P7 families are integrated together with a 5^th gen controller into a single package. The newly implemented cascode configuration for the high voltage MOSFET in combination with the internal current regulator provides fast startup. Light load performance is optimised through an Active Burst Mode (ABM) with selectable entry/exit thresholds.

The design of the device incorporates new algorithms to minimise the switching frequency spread between different line conditions and simplify EMI filter design. Device protection includes input over-voltage protection, brown in/out, pin short to ground, and over-temperature protection with hysteresis. All protection features are implemented with auto-restart to minimise any interruption to operation.