New rectifier controller from Zetex optimises flyback converter design
"Simpler and more robust than competing synchronous controller ICs, the driver needs the support of just three external passive components and produces source and sink currents of up to 2.5A,"
(EMAILWIRE.COM, May 28, 2008 ) Hong Kong - Zetex Semiconductors has introduced a dedicated rectifier controller for driving MOSFETs so that they perform as 'ideal diodes' in synchronous flyback converters ranging from 50 to 150W. The ZXGD3101 enables designers to replace lossy Schottky diodes with surface mount MOSFETs to achieve higher efficiency, less heat generation, a reduction in power supply size and weight and a simplification of overall circuit design.
Called a 'zero point detector driver' (ZPDD) since it accurately senses the point at which secondary current reaches zero, the ZXGD3101 ensures that a MOSFET performs the same function as the diode it replaces while significantly improving power supply efficiency. In a 60W notebook adapter for example, the losses are typically reduced by 20 per cent.
"Simpler and more robust than competing synchronous controller ICs, the driver needs the support of just three external passive components and produces source and sink currents of up to 2.5A," said Echo Li, vice president of sales at Zetex Asia Pacific. "Since no timing information needs to be transferred from the primary side and no timing components are needed on the secondary side, the ZXGD3101 is very simple to implement."
The ZPDD incorporates a high voltage differential amplifier stage and a high current driver in the compact SM8 package. It monitors MOSFET drain-source reverse voltage and when body diode conduction occurs, produces a positive gate voltage to turn the MOSFET on. Being proportional to the MOSFET drain-source reverse voltage, the drive voltage to the gate is progressively backed off, thereby ensuring rapid MOSFET turn-off at the zero voltage switching point. This ensures that reverse conduction does not occur.
The ZXGD3101 zero point detector driver from Zetex Semiconductors is supported by a 'plug-and-play' evaluation board enabling fast evaluation in existing power adaptor designs.
About Zetex
Zetex Semiconductors designs and manufactures high-performance analogue semiconductors for a broad spectrum of applications, with a particular focus on LED lighting, audio and DBS applications. Its integrated and discrete semiconductor products offer compact, high efficiency power management and signal processing solutions which meet the demand for greater power efficiency, precision and speed in analog and digital circuit design.
The company is headquartered near Manchester in the UK and has design support, manufacturing and sales operations located throughout Asia, Europe and North America. Zetex employs more than 650 people worldwide and is the only UK quoted, vertically integrated silicon semiconductor manufacturer. For more information visit www.zetex.com.
Issued on behalf of Zetex (Asia) Ltd
by EBA Communications
For further information please contact:
Stanley Leung (Zetex): (852) 2610 7932
(email: sleung@zetex.com)
Andy Wong (EBA): (852) 2537 8022
(email: andy.wong@ebacomms.com)
###
This press release was issued through GroupWeb EmailWire.Com. For more information on press release distribution, go to http://www.emailwire.com .
Called a 'zero point detector driver' (ZPDD) since it accurately senses the point at which secondary current reaches zero, the ZXGD3101 ensures that a MOSFET performs the same function as the diode it replaces while significantly improving power supply efficiency. In a 60W notebook adapter for example, the losses are typically reduced by 20 per cent.
"Simpler and more robust than competing synchronous controller ICs, the driver needs the support of just three external passive components and produces source and sink currents of up to 2.5A," said Echo Li, vice president of sales at Zetex Asia Pacific. "Since no timing information needs to be transferred from the primary side and no timing components are needed on the secondary side, the ZXGD3101 is very simple to implement."
The ZPDD incorporates a high voltage differential amplifier stage and a high current driver in the compact SM8 package. It monitors MOSFET drain-source reverse voltage and when body diode conduction occurs, produces a positive gate voltage to turn the MOSFET on. Being proportional to the MOSFET drain-source reverse voltage, the drive voltage to the gate is progressively backed off, thereby ensuring rapid MOSFET turn-off at the zero voltage switching point. This ensures that reverse conduction does not occur.
The ZXGD3101 zero point detector driver from Zetex Semiconductors is supported by a 'plug-and-play' evaluation board enabling fast evaluation in existing power adaptor designs.
About Zetex
Zetex Semiconductors designs and manufactures high-performance analogue semiconductors for a broad spectrum of applications, with a particular focus on LED lighting, audio and DBS applications. Its integrated and discrete semiconductor products offer compact, high efficiency power management and signal processing solutions which meet the demand for greater power efficiency, precision and speed in analog and digital circuit design.
The company is headquartered near Manchester in the UK and has design support, manufacturing and sales operations located throughout Asia, Europe and North America. Zetex employs more than 650 people worldwide and is the only UK quoted, vertically integrated silicon semiconductor manufacturer. For more information visit www.zetex.com.
Issued on behalf of Zetex (Asia) Ltd
by EBA Communications
For further information please contact:
Stanley Leung (Zetex): (852) 2610 7932
(email: sleung@zetex.com)
Andy Wong (EBA): (852) 2537 8022
(email: andy.wong@ebacomms.com)
###
This press release was issued through GroupWeb EmailWire.Com. For more information on press release distribution, go to http://www.emailwire.com .
Contact Information:
Zetex Semiconductors
Stanley Leung
Tel: 852 2610 7932
Email us
This is a press release. Press release distribution and press release services by EmailWire.Com: http://www.emailwire.com/us-press-release-distribution.php.
Zetex Semiconductors
Stanley Leung
Tel: 852 2610 7932
Email us
This is a press release. Press release distribution and press release services by EmailWire.Com: http://www.emailwire.com/us-press-release-distribution.php.
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