ADI iSopower products such as ADuM5201 have 180MHz switching frequency for DC-DC converter.
I wonder why iSopower has 180MHz switching frequency.
Mack: The datasheet gives some information about the high switching frequency:
The dc-to-dc converter section of the ADuM520x components must operate at a very high frequency to allow efficient power transfer through the small transformers. This creates high frequency currents that can propagate in circuit board ground and power planes, causing edge emissions and dipole radiation between the primary and secondary ground planes. Grounded enclosures are recommended for applications that use these devices. If grounded enclosures are not possible, follow good RF design practices in layout of the PCB.
The app note AN-0971 shows PC Board techniques to help reduce the radiated emissions from the 180MHz primary switching frequency, and the 360MHz secondary side full wave rectifying frequency. What is the application and do you know the desired output voltage and current and emission requirements?
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