MAX16803 Datasheet, PDF (9/12 Pages) Maxim Integrated Products – High-Voltage, 350mA, High-Brightness LED Driver with PWM Dimming and 5V Regulator

High-Voltage, 350mA, High-Brightness LED
Driver with PWM Dimming and 5V Regulator
Other Applications
The application circuit in Figure 6 implements a two-
level brightness current for TAIL/STOP lights. In TAIL
operation, Q1 is off and the R1 sets the output current.
In STOP operation, Q1 turns on and the output current
is set by a parallel combination of R1 and R2.
Figure 7 shows an application circuit with the
MAX16803 using a single BJT to provide high output
current. For proper operation:
V_IN(MIN) > V_CESAT(MAX) + V_FT(MAX) + V_RSENSE
where V_CESAT(MAX) is the maximum saturation voltage
of the external BJT.
STOP
TAIL
C1
IN
OUT
EN
V5
V5
MAX16803
DIM
CS+
GND
CS-
LEDs
C2
R2
R1
Q1
Figure 6. Two Brightness Level with Current Level Switch for Tail/Stop Lights
LEDs
VIN
IN
OUT
EN
V5
C2
MAX16803
PWM DIMMING
C1
DIM
CS+
GND
CS-
Q1
R_SENSE
Figure 7. Increased LED Current (Amper Range) with a Single BJT
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