IL2575-XX Datasheet, PDF (7/17 Pages) IK Semicon Co., Ltd – 1.0 A, 15 V, Step-Down Switching Regulator

IL2575-xx
5.0 Output Voltage Versions
Adjustable Output Voltage Versions
Figure 14. Typical Test Circuits
PCB LAYOUT GUIDELINES
As in any switching regulator, the layout of the printed circuit board is very important. Rapidly switching
currents associated with wiring inductance, stray capacitance and parasitic inductance of the printed circuit
board traces can generate voltage transients which can generate electromagnetic interferences (EMI) and
affect the desired operation. As indicated in the Figure 14, to minimize inductance and ground loops, the
length of the leads indicated by heavy lines should be kept as short as possible. For best results, single–
point grounding (as indicated) or ground plane construction should be used.
On the other hand, the PCB area connected to the Pin 2 (emitter of the internal switch) of the IL2575
should be kept to a minimum in order to minimize coupling to sensitive circuitry. Another sensitive part of the
circuit is the feedback. It is important to keep the sensitive feedback wiring short. To assure this, physically
locate the programming resistors near to the regulator, when using the adjustable version of the IL2575
regulator.
Rev. 00