FET+1 (or similar) driver understanding

sbslider · 2018-06-05T20:43:41.000Z

I am trying to see if I understand the concept behind FET+1. I believe a constant current driver provides current to the emitter at lower currents (the +1 or N+1 ) and beyond this current a additional current is provided by switching the emitter via a FET directly to a power source, often the battery, but I supposed it could be some other regulated voltage. The switching of the FET is done at a very low duty cycle at first, and increase output is achieved by increasing the duty cycle. Max output would be the FET always on.

Is this correct?

BlueSwordM · 2018-06-05T20:56:22.000Z

There are two types of FET+linear regulator drivers.

1. FET+7135 two channel driver. This allows for current regulation below 350mA, and a hybrid of FET and 7135 regulation, meaning brightness is subject to voltage changes of the cell, but not as much as full turbo. Turbo is directly dependent of battery voltage.

2.FET+7135+n7135. This allows for regulation up to 350mA, then n350mA to the number of linear regulators you can have. This allows for output regulation all the way from moonlight, to a full 2000 lumens with a 16x7135 configuration. This allows for very good regulation up to 6A. Above that, it is the same thing as above.

sbslider · 2018-06-06T02:59:04.000Z

Thanks for the explanation.