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High-Voltage, 350mA, High-Brightness LED
Driver with PWM Dimming and 5V Regulator
Two Brightness Levels for
TAIL/STOP Lights
Figure 4 shows PWM dimming operation for the
MAX16803 with an ICM7555 timer. The ICM7555 pro-
vides adjustable duty cycle using two external resistors
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
ICM7555. When V STOP is present, DIM is pulled up to
V STOP . 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.
D1
STOP
D2
LED Current Thermal Foldback
With a minimum number of external components, the
MAX16803 provides LED current thermal foldback
using a negative temperature coefficient (NTC) thermis-
tor. Figure 5 shows a thermistor connected to V5 and
the CS+ of the MAX16803. As the temperature increas-
es, the voltage drop across R2 increases causing the
LED current to decrease.
I LED = [V SENSE - [R2 / (R2 + RT)] x V5] / R1
TAIL
R1
IN
OUT
R2
D3
C1
EN
MAX16803
V5
+5V REG
C2
LEDs
IN
D4
DIS
OUT
DIM
CS+
R3
TH
TRG
ICM7555
GND
GND
CS-
R SENSE
C3
Figure 4. PWM Dimming Operation with ICM7555 Timer
V IN
IN
OUT
PWM DIMMING
EN
MAX16803
V5
C2
RT
LEDs
C1
DIM
GND
Figure 5. LED Current Thermal Foldback with an NTC Thermistor
CS+
CS-
R2
R1
8
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