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How to apply additional PWM intensity control to LED drivers

Posted: 07 Jul 2010 ?? ?Print Version ?Bookmark and Share

Keywords:LED drivers? PWM intensity control? power supply?

Maxim Integrated Products provides many LED drivers with PWM intensity control for a wide range of applications. The intensity is normally controlled by using the serial interface to send the LED driver a command to change the register bits for the corresponding LED. The number of bits for intensity control ranges from 4 to 8bits, which corresponds to 16 to 256 intensity levels. Intensity control for other Maxim LED drivers is carried out by adjusting the amount of the constant current sinking through an open-drain LED port.

This application note discusses how additional PWM intensity control can be applied to constant-current LED drivers by using a switched-LED power supply. External PWM intensity control can also be emulated by refreshing data bits. LED drivers with built-in PWM can also benefit from additional, external PWM intensity control if clocks regulating these PWM signals can be synchronized.

View the PDF document for more information.

Click here to view related datasheets.

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