I am looking for a driver that would both be suitable for both TRIAC and PWM/linear dimming (from a microcontroller). The output needed is 10W at 70V (or below). Additionaly only off-the-shelf inductors should be used.
The challange i am facing is that anything but LYTSwitch-0 has complex internal blocks, so the only predictable way i can think of controlling the output current is using a transistor in series with the current sense resistor.
With LYTSwitch-0 i could make the microcontroller part of the control loop, measuring phase angle, LED current, and producing the binary skip/no-skip feedback signal to the LYT0006D. PFC and an active bleeder would also be simple additions. The active bleeder might not even be required, since a buck-boost LYT0006D with Vout=70 should be able to work down to 30 Vin, or to put it another way: able to draw current for 94% of a 230 VAC cycle (89% for 120 VAC).
Last thing would be adding the input dampening, maybe even active.
Is this a good idea?
If so could you point me to some resources on the LYTSwitch-0 in buck-boost mode. I haven't been able to find any reference designs / PI expert online support.