I need some help understanding the following from the SN6501 datasheet:
18.104.22.168 SN6501 Drive Capability
The SN6501 transformer driver is designed for low-power push-pull converters with input and output voltages in the range of 3 V to 5.5 V. While converter designs with higher output voltages are possible, care must be taken that higher turns ratios don’t lead to primary currents that exceed the SN6501 specified current limits.
Is there something hidden in that note or is it simply a warning that when you step up the voltage, the max current on the secondary should be proportionately less in order to keep the power the same?
In the Recommended Isolation Transformers table in the datasheet, what is the reason that none of the higher turns ratio transformers are specified for 5V on the primary? For example, Wurth part number 760390015 is used to step up from 3.3V to 5V. Why wouldn't it also be specified for stepping 5V up to 9V or so? Is that note in the datasheet the reason?