TNY276 frequency problem

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When I use the TNY276, the output is 5V, but the frequency of the transform's secondary side is only about 30-40kHz, while in the datasheet,it says that the typical oscillator frenquency is internally set to an average of 132kHz, my question is, does TNY276 work at the frequency of 132kHz all the time, or it will change as the load changes? thank you!