Product category: Discrete Power Devices
News Release from: Ixys Semiconductor | Subject: Depletion-mode power MOSFETs
Edited by the Electronicstalk Editorial Team on 23 January 2006
Power MOSFETs are
ideal for dynamic loads
Ixys has expanded its portfolio of 500 and 1000V depletion-mode power MOSFETs with new current ratings, package options and reduced costs
This family of power MOSFETs operate in a normally-on mode, not requiring energy or gate voltage for turn on. The operating mode, with internal diode and enhanced linear operating capability make them ideal for dynamic loads applications, current control for current sources and current regulators and biasing off the high voltage DC line in power systems.
This article was originally published on Electronicstalk on 23 January 2006 at 8.00am (UK)
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Fabricated using Ixys' low-on-resistance HDMOS process, they provide for simplified control and reduced high-line voltage dissipation when used for line interface in offline applications.
Ideal applications include current regulation, solid-state relays, level shifting, load switch, active loads, startup circuits and active power filters.
These devices shine in high energy efficiency applications as a normally-on switch as they do not require energy or voltage for turn-on.
With the high degree of current regulation, these devices can act as active inductors with high dynamic impedance in power filter applications to limit voltage and current noise and spikes.
These unique MOSFETs can also be used as active circuit protection to limit current flow in the event of an overload or short-circuit.
In high voltage applications, depletion-mode power MOSFETs are ideal for reducing power dissipation.
A resistor normally used in these types of applications experiences dissipation proportional to the square of the input voltage, reducing efficiency and increasing cost due to the need for high cost power resistors.
Depletion-mode power MOSFETs can be used to replace the line interface resistor with a near constant current source, reducing power dissipation, cost and circuit board area.
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