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MAX16814
Integrated, 4-Channel, High-Brightness LED
Driver with High-Voltage DC-DC Controller
1500 ( 1.23 ? V C )
I OUT = + × 1220
with C COMP and R COMP . Figure 5 shows the SEPIC
configuration and Figure 6 shows the coupled-inductor
boost-buck configuration.
Analog Dimming Using External
Control Voltage
Connect a resistor R SETI2 to the SETI input as shown in
Figure 7 for controlling the LED string current using an
external control voltage. The MAX16814 applies a fixed
1.23V bandgap reference voltage at SETI and measures
the current through SETI. This measured current mul-
tiplied by a factor of 1220 is the current through each
one of the four constant current-sink channels. Adjust
V IN
4.75V TO 40V
the current through SETI to get analog dimming func-
tionality by connecting the external control voltage to
SETI through the resistor R SETI2 . The resulting change
in the LED current with the control voltage is linear and
inversely proportional. The LED current control range
remains between 20mA to 150mA.
Use the following equation to calculate the LED current
set by the control voltage applied:
R SETI R SETI2
L1
C S
D1
UP TO 40V
C1
IN
NDRV
R SCOMP
CS
N
R CS
L2
OVP
R1
R2
C2
EN
V CC
OUT1
OUT2
C3
R5
MAX16814
OUT3
C4
DRV
OUT4
SETI
R SETI
V CC
DIM
COMP
FLT
RSDT
R3
R COMP
C COMP
SGND
PGND
LEDGND
RT
R T
R4
Figure 5. SEPIC Configuration
20
Maxim Integrated
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