MT6704 is a high performance 40V synchronous rectifier series product for Flyback converters. It is compatible with various Flyback converters types.MT6704 It supports DCM, CCM and Quasi-Resonant. It integrates a 40V power MOSFET that can replace Schottky diode for high efficiency. It turns on the internal MOSFET if the V SW <V TH-ON and turns it off the internal
MOSFET if the V SW >V TH-OFF . It don’t need external power suppoy,and it supports High-side and Low-side Rectification. It Integrated with intelligent turning on detection function, MT6704 it can effectively prevent the misjudge of MOSFET caused by V DS oscillation in DCM and improve system efficiency and reliability
MT6704A: 5V2.1A ; MT6704B: 5V2.4A; MT6704C: 5V3.1A;
MT6704 PCB Layout
The following rules should be followed in MT6704 PCB layout:
VCC capacitor: The VCC pin must be locally bypassed with a capacitor.Capacitance as close as possible to VCC-pin.
The Area of Power Loop: The area of the main current loop should be as small as possible to reduce EMI radiation, such as the snubber circuit and the secondary rectifying loop.
MT6704 SW and GND Pin:SW pin increases the copper area of the drain terminal for heat dissipation . And the PCB trace of SW and GND must be wide and short for thermal consideration.However too large copper area may compromise EMI performance.