Power

Fixed frequency PWM controller delivers circuit protection

5th April 2018
Lanna Deamer
0

Today’s power supplies demand components which provide suitable performance, efficiency, robustness, and ease of design. To meet this need, Infineon Technologies has announced the fixed frequency 700/800V CoolSET 5th generation. This solution combines a PWM controller IC with the latest 700 and 800V CoolMOS P7 MOSFETs in a single package. The single platform supports isolated and non-isolated flyback topologies.

The new fixed frequency 700/800V CoolSET uses a high voltage Superjunction MOSFET in combination with an internal current regulator in a cascode configuration.

This combination provides rapid startup, and easy implementation of brown in protection. The integrated 800V MOSFET and optimised blanking time support high AC line inputs up to 350V AC. Switching losses are reduced through an eco-mode which features a reduced switching frequency at mid and light load conditions.

In addition to the standard output short, overload and over voltage protection, the CoolSET can detect abnormal line input conditions.

In-system protection includes V CC and CS pin short-to-ground to prevent controller damage during abnormal startup conditions. Over temperature protection uses hysteresis to improve operational fault handling. All protection modes are implemented with auto-resume to minimise interruptions to system operation.

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