Product category:
Discrete Power Devices
News Release from: Fairchild Semiconductor | Subject: FDS3572
Edited by the Electronicstalk Editorial
Team on 15 December 2004
MOSFET lowers its figure of merit
A new 80V N-channel MOSFET provides excellent overall system efficiencies in both primary-side DC/DC convertor and secondary-side synchronous rectifier switching power supply designs.
The FDS3572 is an 80V N-channel MOSFET in SO-8 packaging with combined performance benefits that provide excellent overall system efficiencies in both primary-side DC/DC convertor and secondary-side synchronous rectifier switching power supply designs The FDS3572 boasts a 7.5nC Miller charge that is 38% lower than products with similar on-resistance ratings
This article was originally published on Electronicstalk on 28 Feb 2001 at 8.00am (UK)
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This low Miller charge combined with the device's low on-resistance (16mohm) adds up to a figure of merit of 120 - 33% lower than the closest competitor.
This device also features best-in-class total gate charge (31nC at 10V) for low power loss, a low reverse recovery capacitance (70nC) for lower reverse recovery losses and high avalanche energy capability (515mJ) for robust performance.
These many product attributes, together in one low-profile package, make the FDS3572 ideal for today's increasingly demanding power supply designs.
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The FDS3572 switch is well suited for preregulated, high-density isolated full- or half-bridge DC/DC convertor circuit applications.
This product is ideal for primary-side applications such as low voltage telecomms power supplies, DC/DC convertors, networking and datacommunications power supplies, servers and VRMs (voltage regulator module) adopting the latest bus convertor topologies supporting intermediate bus architectures (IBA).
In these applications, where frequencies upwards of 250kHz are common, the FDS3572's very low Miller charge enables fast switching, thereby reducing dynamic losses, while its very low gate charge increases system efficiency by reducing power losses in the driver/PWM controller IC.
This advanced device can also be used as a synchronous rectifier to replace traditional higher voltage Schottky rectifiers in the secondary-side of a DC/DC convertor for output voltages from 5 to 52V.
Typical products include networking and datacommunications DC/DC convertors and external AC/DC notebook adapters.
The FDS3572's impressive on-resistance keeps conduction losses in check and increases power density in AC/DC notebook adapters.
This improved power density is especially critical since processor power requirements are becoming more demanding as more multimedia functions are integrated into portable product platforms.
Synchronous rectification applications also benefit from the FDS3572's robust avalanche capability and low-profile packaging.
"Today's DC/DC convertor designers strive to pack as much power as possible into increasingly smaller spaces without exceeding their thermal budget", said David Grey, Fairchild's Technical Marketing Manager.
"The FDS3572 meets their demands for efficiency, robust performance, low profile packaging and excellent die-to-footprint utilisation".
This lead-free (Pb-free) product meets or exceeds the requirements of the joint IPC/JEDEC standard J-STD-020B and is compliant with the European Union requirements, which will take effect in 2005.
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