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Rectifier chip boosts power conversion efficiency

Posted: 28 Feb 2006 ?? ?Print Version ?Bookmark and Share

Keywords:SG6203? rectifier control chip? flyback power converters? System General?

System General released the SG6203 power IC product, a secondary synchronous rectifier control chip suitable for general low-voltage high-current flyback power converters. This device is targeted at notebook PCs, industrial computers and LCD TVs.

The SG6203 is a secondary synchronous rectifier controller for flyback converters. It substitutes a pulse-width modulation (PWM) controller for the conventional secondary Schottky diode, and helps reduce conduction loss and raise conversion efficiency. To reduce power dissipation to a minimum, the SG6203 uses the patented synchronized regulation technology. Under the continuous current operation mode, it can generate the best dead time with the help of its automatic primary PWM signal detection and reduce power dissipation, says System General in a press release. The product is also said to improve power conversion efficiency by using an equivalent serial resistor and an output capacitor as the secondary current detector.

The SG6203 provides power supply protection, has working voltage ranges from 6V to 20V, and can operate under continuous or discontinuous current modes. The product's power protection mechanism will be activated under the small load and discontinuous current mode to avoid reverse current. The company added that the SG6203 can reduce the heatsink size and further the power converter size.

Additional features of the SG6203 include an activation current of 1.7mA; available time setting; no reverse current under the small load and discontinuous current mode; and reverse current detection protection.

The SG6203 has two current detection mechanisms available: current shunt and RC network. It is available in SOP-8 and DIP-8 Pb-free packages.

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