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LM5576: recommended operating frequency limitation

Part Number: LM5576

Hi,

Could you let me know what LM5576's operating frequency is specified 50k~ 500kHz even though the integrated oscillator is upto 1MHz? And TINA simulation actually shows me a well-regulation when I set fsw>500kHz. Can I design LM5576 with fsw>500kHz if TINA  works well? Otherwise, is there specific reason why the frequency below 500kHz is recommended?