International Rectifier Corp. (IR, El Segundo, CA) introduced the IRF7842, a 40 V n-channel, HEXFET™ power MOSFET optimized for isolated dc-dc converters for telecommunications systems. The 40 V device expands the IR offering of secondary-side power management switch devices for telecommunications 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 V to 75 V is typically used. This can develop a voltage swing on the secondary side in the range of 5 V to 12 V, therefore requiring a 40 V MOSFET since a 30 V rated device does not provide the required voltage rating headroom.
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. The IRF7842 also delivers as much as 0.5% higher efficiency when compared to industry-standard 40 V devices in the same dc-dc bus converter.