IR1167, IR11662, IR11672 – DirectFET Daughter Card (top) (bottom) The schematic for the daughter board is shown below. IR1167(A,B)S, IR11662S, IR11672S ID U1 R1 R2 R3 C1 C2 M1 SMD Size SOIC8 1206 1206 2010 1210 1206 D-FET MN can Description IR1167(A,B)S, IR11662S, IR11672S VCC Series Resistor MOT Resistor Gate Resistor Decoupling Capacitor Enable Capacitor Synchronous FETs SW1 needs to be set according to the following table (See AN1087 for details) System Mode of Operation DCM or CrCM Boundary CCM CCM OVT connected to (typical values) Ground, VTH1 = -3.5mV Floating, VTH1 = -10.5mV VCC, VTH1 = -19mV The daughter card shown above is designed to allow easy retrofitting in existing systems with minimal changes. 1