MAX16823(2007) 查看數據表（PDF） - Maxim Integrated

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MAX16823
(Rev.:2007)

High-Voltage, 3-Channel Linear High-Brightness LED Driver with Open LED Detection

Maxim Integrated 

High-Voltage, 3-Channel Linear High-Brightness

LED Driver with Open LED Detection

Block Diagram

REG

IN

IN

IN

BANDGAP

I_REG

UVLO

IN

OUT1

CS1

GND

DIM1

MAX16823

DIM2

THERMAL

SHUTDOWN

DIM3

LEDGGOOD

LGC

LEDGOOD

DETECTOR

I_REG

I_REG

IN

OUT2

CS2

IN

OUT3

CS3

Pulse-Dimming Inputs (DIM_)

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).

Two Brightness Levels for

TAIL/STOP Lights

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

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