The MAX16805/MAX16806 LED drivers eliminate the
need for microcontrollers or switch-mode converters for
automotive interior dome, map, and courtesy light
applications. An EEPROM-programmable LED current-sense
reference simplifies production by using one
sense resistor to set the LED current for all LED bins. A
dual-mode DIM pin and an on-board 200Hz ramp generator
allow for PWM dimming with an analog or PWM
control signal. The analog control signal at dimming
input DIM allows for the "theater dimming" effect to be
implemented. Fast turn-on/-off times ensure a wide-range
PWM operation, while waveshaping circuitry minimizes
EMI. EEPROM-programmable LED current foldback makes it possible to operate at a high input voltage, while saving the cost and space associated
with having a large heatsink. The MAX16806 works with
an external thermal sensor to maintain maximum LED
junction temperature by folding back the LED current.
The thermal foldback temperature knee and slope are
EEPROM programmable. The MAX16806 SW pin supplies
necessary wetting current to a momentary switch.
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