IK2312

7

2015. June. Ver. 02

LAYOUT CONSIDERATIONS

Single Point Grounding

Use a single point ground connection from the input filter capacitor to the area of copper connected

to the GND pin.

Switching Loop Areas

together should be kept as small as possible. The switching loop area connecting the output filter

Thermal Considerations vs. Radiated EMI

The copper area where GND pin is connected acts not only as a single point ground, but also as a

heat sink. This area should be maximized for good heat sinking. The same applies to the cathode

of the freewheeling diode D. Both nodes are quiet and therefore, will not cause radiated RF

emission. The switching node copper area connected to the DRAIN pin of the IK2312, the anode of

D and the inductor L needs to be minimized. A large switching node area can increase high

frequency radiated EMI.

Input Filter Layout Considerations

The input circuits of the EMI filter must not be placed in the direct proximity to the inductor L in

order to avoid magnetic coupling of its leakage fields. This consideration is especially important

when unshielded construction of L is used. When an axial input EMI filter inductor LIN is selected,

be minimized. The input lead wires must be twisted together.