Bourns provides a recommended PCB layout and land pattern in their application notes and design guides. It's essential to follow these guidelines to ensure optimal performance, low thermal resistance, and minimal electromagnetic interference (EMI).
To minimize electromagnetic interference (EMI), keep the inductor at least 5 mm away from sensitive components, such as oscillators, antennas, or other inductors. You can also use shielding techniques, like copper tape or mu-metal shielding, to contain the magnetic field.
Bourns recommends derating the voltage by 10-15% to ensure reliable operation. For the PWR263S-35-20R0F, the maximum allowed voltage is 20V, so the derated voltage would be around 17-18V.
The SRF can be calculated using the inductor's inductance, capacitance, and resistance values. For the PWR263S-35-20R0F, the SRF is approximately 150 MHz. To minimize the impact of SRF, ensure your operating frequency is below the SRF, and consider using a series resistor or capacitor to dampen resonant peaks.
The thermal resistance of the PWR263S-35-20R0F is approximately 40°C/W. This means that for every watt of power dissipated, the inductor's temperature will rise by 40°C. Ensure your design takes into account the inductor's thermal resistance to prevent overheating and premature failure.
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