Quasi Resonant offline Flyback LED drivers not for dimming?

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cupoftea

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Hi
Regarding offline Quasi Resonant Flyback LED driver IC’s.
Its very noticeable that there are none available which provide facility to dim the LEDs down to <1W, when max power is 25W+.

This I am sure you would agree, is because the switching frequency of QR Flybacks gets far too high when they are only providing low output power….and conducted EMC regulations get tougher at >150kHz.

For example, the power integrations LYTswitch range does not have wide dimming facility...

..neither does any other QR LED driver
 

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