MAX16823_09 Datasheet, PDF (10/12 Pages) Maxim Integrated Products – High-Voltage, 3-Channel Linear High-Brightness LED Driver with Open LED Detection

High-Voltage, 3-Channel Linear High-Brightness
LED Driver with Open LED Detection
V_IN
IN
C_IN
OUT_
PWM DIMMING
MAX16823
DIM_
REG
C2
CS_
Q1
LEDs
Preload Current
Figure 6 shows the MAX16823 with a preload circuit. In
the circuit, the BJT, R_PRELOAD, and REG generate a
preset load current. The preset load current I_PRESET is
determined with the following formula:
I_PRESET
=
V_REG − 0.7V
R_PRELOAD
This circuit is used with older body controllers that
monitor minimum RCL current to detect failures.
R_{CS_}
GND
Figure 5. Increased LED Current (Amper Range) with a Single
BJT
STOP
TAIL
R_PRELOAD
C_IN
100kΩ
100kΩ
C_LGC
C_REG
IN
OUT1
IN
OUT2
IN
OUT3
DIM1
DIM2 ^MAX16823
DIM3
CS1
LGC
CS2
REG
CS3
GND
TAIL
TAIL
STOP
R_CS1
R_CS2
R_CS3
Figure 6. Preload Current Setting
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