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MAX16823AUE+ Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX16823AUE+ Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 12 page High-Voltage, 3-Channel Linear High-Brightness LED Driver with Open LED Detection 8 _______________________________________________________________________________________ ICM7555. When VSTOP is present, DIM is pulled up to VSTOP. The PWM dimming operation is disabled and the LEDs light up to full brightness. See the ICM7555 data sheet for formulas to calculate the dimming fre- quency and the duty cycle. Outputs Latch-Off Figure 3 shows a circuit with DIM1, DIM2, DIM3, and LEDGOOD connected through a resistor to VREG. This circuit is useful for applications that require all outputs to latch off when one of the LEDs opens. The MAX16823 resumes current regulation again through power cycling, once the fault condition is removed. Other Applications The application circuit in Figure 4 implements a two- level brightness current for TAIL/STOP lights. In TAIL operation, Q1 is off and RCS1 sets the output current. In STOP operation, Q1 turns on and the output current is set by a parallel combination of RCS1 and R2. Figure 5 shows an application circuit with the MAX16823 using a single BJT to provide high output current. For proper operation: For minimized dropout, the LEDs can be placed in the collector. VV V V V IN MIN BE MAX FT MAX CS DO MAX ( ) () () _ ( ) >+ + + DIM tON LEDGOOD LEDGOOD GOES LOW WHEN tOFF > tDELAY tOFF Figure 1. LEDGOOD Timing Delay IN DIM2 CS1 REG OUT1 GND RCS1 RCS2 RCS3 LEDs 0.1 µF TH TRG GND OUT IN DIS ICM7555 R3 C2 R2 R1 D1 D4 C1 D2 D3 TAIL STOP DIM1 DIM3 OUT2 OUT3 CS2 CS3 MAX16823 100k Ω Figure 2. PWM Dimming Operation with ICM7555 |
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