Synchronous MOSFET Controller raises AC/DC converter efficacy.August 27, 2010 -
Comprised of differential amplifier detector and high current driver in SO8 package, ZXGD3103N8 drives MOSFET in place of Schottky diode in secondary side of flyback and resonant converters. It monitors MOSFET reverse voltage and applies positive turn-on voltage to gate if body diode conduction is detected. Characteristics include 10 mV typ detector threshold voltage, respective turn-off propagation and fall times of 15 and 20 ns, and 5 mA typ standby current.
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Original Press release
Diodes, Inc.
3050 E. Hillcrest Dr.
Westlake Village, CA, 91362
USA
Diodes Incorporated Announces MOSFET Controller that Raises AC-DC Converter Efficiency
Diodes Incorporated (Nasdaq: DIOD), a leading global manufacturer and supplier of high-quality application specific standard products within the broad discrete, logic and analog semiconductor markets, today has introduced a synchronous MOSFET controller for driving a MOSFET in place of a Schottky diode in the secondary side of flyback and resonant converters. Designed to maximize circuit efficiency and help achieve Energy Star product ratings, ZXGD3103N8 enables designers to reduce rectifier losses by up to 70% and increase power supply efficiency by up to 3.5%.
Comprising a differential amplifier detector and high current driver, the ZXGD3103N8 monitors MOSFET reverse voltage and applies a positive turn-on voltage to the gate if body diode conduction is detected. Being proportional to the MOSFET drain-source reverse voltage, the gate-drive voltage can guard against premature turn-off of the MOSFET; thereby, maximizing circuit efficiency.
To further improve efficiency, the MOSFET controller's low detector threshold voltage, typically 10mV, means that body diode conduction is kept to an absolute minimum. In addition, very fast turn-off propagation and fall times, respectively 15ns and 20ns, ensure shoot-through or reverse current conduction is minimized, helping to maximize power supply circuit efficiency.
With its wide operating voltage range, the SO8 packaged ZXGD3103N8 can be powered directly from supply rails between 5V and 15V or higher via external regulator. Its ability to block drain voltages up to 180V means no external clamping circuit is required, and its low standby current, typically 5mA, enables compliance with the Energy Star standby rating. Further information can be found at the Company's website at http://www.diodes.com.
About Diodes Incorporated
Diodes Incorporated (Nasdaq: DIOD), a Standard and Poor's SmallCap 600 and Russell 3000 Index company, is a leading global manufacturer and supplier of high-quality application specific standard products within the broad discrete, logic, and analog semiconductor markets. Diodes serves the consumer electronics, computing, communications, industrial, and automotive markets. Diodes' products include diodes, rectifiers, transistors, MOSFETs, protection devices, functional specific arrays, single gate logic, amplifiers and comparators, Hall-effect and temperature sensors; power management devices, including LED drivers, DC-DC switching and linear voltage regulators, and voltage references along with special function devices, such as USB power switches, load switches, voltage supervisors, and motor controllers. The Company's corporate headquarters, logistics center, and Americas' sales office are located in Dallas, Texas. Design, marketing, and engineering centers are located in Dallas; San Jose, California; Taipei, Taiwan; Manchester, England; and Neuhaus, Germany. The Company's wafer fabrication facilities are located in Kansas City, Missouri and Manchester, with two manufacturing facilities located in Shanghai, China, another in Neuhaus, and a joint venture facility located in Chengdu, China. Additional engineering, sales, warehouse, and logistics offices are located in Taipei; Hong Kong; Manchester; and Munich, Germany; with support offices located throughout the world. For further information, including SEC filings, visit the Company's website at http://www.diodes.com.
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