Multiple LT3965s can be individually addressed on a single communications bus to multiply the strings in a large array.The eight channels can control the individual red, green, blue and white light on two RGBW LED modules for adjustable brightness or changing color of dashboard or trim lighting.Each LT3965 can control eight dimming channels-eight LEDs or eight clusters-within a string of LEDs.The individually addressable channels of the LT3965 can be used to control LED matrices in many ways, including:
Its highly integrated design (Figure 2) minimizes component count.
LED DRIVER WITH BRIGHTNESS CONTROL SERIAL
LT3965 60V 8-switch LED matrix dimmer block diagram reveals eight power NMOSs hunt switches for brightness control, a fault flag and I 2C serial communications interface. Figure 1 shows the LT3965 in action on Linear’s demonstration circuit DC2218.įigure 2. The LT3965 I 2C 8-switch matrix LED dimmer makes it easy to control large or small LED matrices (up to 512 LEDs). It is possible to build a matrix driver with traditional driver/converter ICs that include a serial communications feature, but once more than two or three switches are needed for a matrix of LEDs, designing a discrete component solution becomes challenging, involving a matrix of components that exceeds the size of the LED matrix. Each LED (or segment of LEDs) requires either its own converter or its own shunt power switch. It is not difficult, in theory, to address the individual LEDs in a matrix via computer-controlled power switches, allowing individual LEDs to be turned on or off, or PWM dimmed, to create unique patterns and functions. Matrix headlights take advantage of the innate abilities of LEDs by enabling control of the brightness of individual LEDs within LED strings. But this leaves much of the LEDs’ potential on the table. I 2C Control of Eight Power Switches with a Single ICĪ basic LED headlight design operates with uniform LED current, and thus, uniform brightness.
The LT3965: limitless control of automotive matrix headlights and lighting systems The future has arrived: Linear Technology’s LT3965 matrix LED driver makes it easy to take the next step in automotive lighting design. Simple strings of LEDs will give way to matrices of LEDs that can be individually dimmed via computer control, enabling unlimited real-time pattern control and animation. Future models will feature more LED lights, including new shapes and colors, and more control over the individual LEDs.
LED DRIVER WITH BRIGHTNESS CONTROL FULL
There is no question that automobile LED lighting has arrived, but it has not yet reached its full potential. Automobile designers are increasingly incorporating LEDs in lighting because they can be arranged in distinctive eye-catching designs-helping distinguish new models from old, or high end from economy. LEDs combine design flexibility with practical, robust circuitry, enabling automotive designers to produce striking headlight designs matched by exceptionally long life and performance. Led controller.Control Individual LEDs in Matrix Headlights with Integrated 8-Switch Flicker-Free Driver