40 V rectification MOSFET optimised for telecom and datacom applications

6 October 2004 Power Electronics / Power Management

International Rectifier has introduced the IRF7842, a 40 V N-channel HEXFET power MOSFET optimised for isolated DC-to-DC converters for telecom systems.

The 40 V rating enhances reliability when used in secondary-side synchronous rectification circuits for telecom and datacom systems where a wide range input voltage of 36 to 75 V is typically used. This can develop a voltage swing on the secondary side in the range of 5 to 12 V, therefore requiring a 40 V MOSFET, since a 30 V rated device does not provide the required voltage rating headroom. The new 40 V device expands the IR offering of secondary-side power management switch devices for telecommunication systems.

The IRF7842 achieves 95,2% efficiency at 150 W full load when used for secondary-side synchronous rectification in an isolated DC-DC bus converter featuring IR's IR2085S primary-side PWM IC.

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