MAX16823 Maxim Integrated Products, MAX16823 Datasheet - Page 7

• Manufacturer Part Number: MAX16823
• Description: 3-Channel Linear High-Brightness LED Driver
• Manufacturer: Maxim Integrated Products

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The MAX16823 features pulsed or chopped-current
dimming inputs (DIM_) to chop the LED current and to
adjust the brightness. DIM_ also serves as an active-
high enable input. A logic-low at DIM_ turns off OUT_
and a logic-high turns on OUT_. If the signal at DIM
stays low more than the programmed LEDGOOD delay
time, LEDGOOD goes low (Figure 1).
High-Voltage, 3-Channel Linear High-Brightness
LEDGGOOD
DIM1
DIM2
DIM3
_______________________________________________________________________________________
Pulse-Dimming Inputs (DIM_)
GND
LGC
IN
IN
IN
LED Driver with Open LED Detection
MAX16823
DETECTOR
LEDGOOD
BANDGAP
SHUTDOWN
THERMAL
Figure 2 shows the PWM dimming operation for the
MAX16823 with an ICM7555 timer. The ICM7555 pro-
vides an adjustable duty cycle using two external resis-
tors and a capacitor. In TAIL operation, the output of
the ICM7555 feeds into DIM and lights up the LEDs.
The LED’s brightness depends on the duty cycle of the
REG
I_REG
I_REG
I_REG
UVLO
Two Brightness Levels for
IN
IN
IN
Block Diagram
TAIL/STOP Lights
OUT1
CS1
OUT2
CS2
OUT3
CS3
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