Hi, I have an LED driver with MT7201, I configured it for using 2x3watt Philips rebel (3vF/700mA). The brightness is quite good, but in the late night I want the brightness to be decreased at around 10%. As the datasheet mention, to adjust the brightness I need to drive the ADJ pin (free/not use) with PWM signal from open-collector or open-drain transistor. And f<500Hz.
And it also telling that we drive the ADJ pin with DC voltage 0.25v to 2.5v to adjust output current.

Please help me making a brightness controller for this driver.

 

Hello,

Reading the datasheet, the output current will follow this curve:

Bertus