Rainbow-electronics MAX16823 Manual do Utilizador descarregar pdf (Página 10)

MAX16823

High-Voltage, 3-Channel Linear High-Brightness

LED Driver with Open LED Detection

10 ______________________________________________________________________________________

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

determined with the following formula:

This circuit is used with older body controllers that

monitor minimum RCL current to detect failures.

PRESET

REG

PRELOAD

− 07.

DIM_

GND

CS_

LEDs

OUT_

CS_

MAX16823

REG

PWM DIMMING

Figure 5. Increased LED Current (Amper Range) with a Single

BJT

CS1

CS2

CS3

OUT3

CS1

CS2

CS3

GND

DIM2

DIM1

STOP

TAIL

PRELOAD

LGC

REG

LGC

DIM3

REG

OUT2

OUT1

MAX16823

TAIL

STOP

100kΩ

Figure 6. Preload Current Setting

1 2 ... 5 6 7 8 9 10 11 12 13

MAX16823 1

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