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...
The LYTSwitch™-6 series family of ICs dramatically simplifies the development and manufacturing of off-line LED drivers, particularly those in compact enclosures or with high efficiency requirements. The LYTSwitch-6 architecture is revolutionary in that the devices incorporate both...