Diodes ZXGD3104N8 - Manual (Page 9)

ZXGD3104N8
Document Number DS35546 Rev. 1 – 2
9 of 13
www.diodes.com
November 2011
© Diodes Incorporated
A Product Line of
Diodes Incorporated
ZXGD3104N8
Application Information
The purpose of the ZXGD3104 is to drive a MOSFET as a low-V
F
Schottky diode replacement in offline power
converters. When combined with a low R
DS(ON)
MOSFET, it can yield significant power efficiency improvement, whilst
maintaining design simplicity and incurring minimal component count. Figure 2 shows typical configuration of
ZXGD3104 for synchronous rectification in a 19V output Flyback Adaptor.
Figure 2. Example connections in Flyback power supply
Figure 3 shows operating waveforms for ZXGD3104 driving a MOSFET with Q
g(TOT)
= 124nC in a 19V output Flyback
converter operating in critical conduction mode.