Involvement:Expert (understands the inner workings) - Ownership:1 week to 1 month
PT4115 is a very versatile chip that can be supplied up to 30V. So considering you change the capacitor to something like 35V-50V, you can drive 7-8 3W leds with this beast. isnt it amazing?
also the price you can get it is so cheap, it sometimes doesnt worth to make it yourself. In small quantities sourcing the PT4115 and the extra components can be more expensive
not really a con but if you plan not to use AC, its better to tear the 4 schottky diodes that act as a bridge rectifier.
I have made my own board with this driver, in order to control the sense resistor and also add dimming with a 5V source. Its a gem, but it will cost me much more time and effort for the same result.
And if I had not got most of the electronics around, it would also cost me more money
Its so versatile a chip that you definitely dont have to look further when you want to drive 2-7 3W leds :)
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