www.diodes.com with the drive to save power gaining momentum, synchronous rectification is being adopted into more and more power supply designs. replacing the secondary side rectifier diodes with low on- resistance mosfets can cut the rectifier losses by 60~70% giving an overall efficiency saving of up to 3.5%. the ZXGD3103N8 has been designed to control and switch the mosfet to provide optimum performance, thereby minimising the switching and on state losses to improve the overall power supply efficiency. proportional gate drive is the main differentiator when compared to competing solutions. by backing off the voltage applied to the mosfet gate as the drain current falls ensures that the detector does not turn off the mosfet too early in the cycle resulting in lost efficiency. competing solutions use direct drive which means the mosfet is kept fully enhanced often resulting in the detector threshold being reached before the on cycle is complete. the other advantage of the proportional gate drive is that at the point when the mosfet is required to turn-off the current, there is less gate charge to overcome than if the mosfet was still fully enhanced ensuring faster turn-off to minimize shoot through and body diode conduction. for samples and quotations please contact your nearest diodes sales office or representative. new product announcement new synchronous rectifier controller further improves power supply efficiency proportional gate drive prevents premature turn-off of the synchronous mosfet giving optimum performance turn-off propagation delay and fall times of 15 and 21ns respectively prevents reverse conduction and minimises shoot through current ensuring high efficiency operation turn-on propagation delay of 150ns reduces body diode conduction in the synchronous mosfet, reducing losses. suitable for power supplies switching up to 300khz operating voltage range 5 to 15v adaptable in various supply configuration 180v sensing input permits direct connection to the mosfet drain without the need for external protection components the diodes advantage ZXGD3103N8 issue number | 002 july 2010 gatel 3 gateh 4 ref 2 n/c 1 8 drain 7 bias 6 gnd 5 v cc so-8
www.diodes.com new product announcement new synchronous rectifier controller further improves power supply efficiency ZXGD3103N8 applications circuit topologies ? low power adapters ? set top box ? lcd tv ? auxiliary supplies ? high power adapters ? street lighting ? servers ? atx ? set top box flyback converter llc converter multiple output flyback converter issue number | 002 july 2010 p1 s2 +12v s1 s3 r bias r ref l n x2-c l3 br vcc hv gnd fb d gnd t1 ntc u1 u4 zxgd3103 ref bias gatel gateh gnd drain vcc +5v rtn rtn +3.3v synchronous mosfet synchronous mosfet
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