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MOSFET handles pre-bias supply circuitry

Posted: 20 Feb 2006 ?? ?Print Version ?Bookmark and Share

Keywords:ZXMN0545G4? Zetex? MOSFET?

Zetex Semiconductors, a supplier of analog signal processing and power management solution, has introduced a new high voltage MOSFET to handle the requirements of pre-bias supply circuitry.

A 450V enhancement mode N-channel device, the ZXMN0545G4 is used in a simple linear regulator to supply PWM ICs at start-up, and is disabled once the converter is fully on. Compared to alternative resistor dependent solutions, this MOSFET-based approach improves system efficiency and reduces start-up time, the company said.

According to Stephen Lin, VP of Zetex Asia, the ZXMN0545G4 is provided in a 4-pinned SOT223-package to maximize resistance to high voltage creepage. By disconnecting one of the two conventional drain pin positions, this device's new leadframe design significantly extends inter-pin spacing, which helps designers comply with UL and CE creepage distance specifications.

Characterized by low on-resistance (50 ohms max), and supporting continuous drain currents up to 140mA and pulsed currents of 600mA, Zetex's new transistor promises an efficient power handling capability. Additionally, switching speed has turn-on and rise times specified at 7ns.

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