International Rectifier has introduced the IRF7842, a 40V N-channel HEXFET® power MOSFET optimised for isolated DC-to-DC converters for telecommunications systems.
The 40V rating enhances reliability when used in secondary-side synchronous rectification circuits for telecom and datacom systems where a wide range input voltage of 36V to 75V is typically used. This can develop a voltage swing on the secondary side in the range of 5V to 12V, therefore requiring a 40V MOSFET since a 30V rated device does not provide the required voltage rating headroom.
The new 40V device expands the IR offering of secondary-side power management switch devices for telecommunication systems. The IRF7842 achieves 95.2% efficiency at 150W full load when used for secondary-side synchronous rectification in an isolated DC-DC bus converter featuring IR's IR2085S primary-side PWM IC. The IRF7842 also delivers as much as 0.5% higher efficiency when compared to industry standard 40V devices in the same DC-DC bus converter.
International Rectifier Co Ltd, Whyteleafe, Surrey CR3 0BL, UK.