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switching speed of LM317

Other Parts Discussed in Thread: LM317

I have question about LM317.

 We design the following circuit.

    - Constant current circuit by using LM317

    - Switching circuit  by using transistor and FET.

The switching speed is 2Mbps.

Are there problems with switching speed of 2Mbps?

And please tell me optimum switching speed if there are problems about 2Mbps.

Best regards,

Takahiro Nishizawa