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MAX16838
Integrated, 2-Channel, High-Brightness LED Driver
with High-Voltage Boost and SEPIC Controller
3)
There are two loops in the power circuit that carry
high-frequency switching currents. One loop is
when the MOSFET is on—from the input filter
capacitor positive terminal, through the inductor, the
internal MOSFET, and the current-sense resistor, to
the input capacitor negative terminal. The other loop
is when the MOSFET is off—from the input capacitor
possible, have a return path on the power ground
plane for the switching currents on the top layer
copper traces, or through power components. This
reduces the loop area considerably and provides
a low-inductance path for the switching currents.
Reducing the loop area also reduces radiation dur-
ing switching.
positive terminal, through the inductor, the rectifier
diode, output filter capacitor, to the input capaci-
tor negative terminal. Analyze these two loops and
make the loop areas as small as possible. Wherever
D 1
4)
Connect the power ground plane for the constant-
current LED driver part of the circuit to LEDGND as
close as possible to the device. Connect SGND to
PGND at the same point.
V IN
C 1
V DD
BST
C BST
MAX15054
HDRV
Q1
GND
HI
LX
D 2
L
D3
R1 OV
C OUT
R1 EN
R2 EN
C IN
C VCC
R DRV
EN
CFB
V CC
IN
GATE
MAX16838
NDRV
DRAIN
OV
OUT1
OUT2
R ISET
R2 OV
LED
STRINGS
DRV
ISET
C DRV
FLT
DIM
COMP
CS
RT
R COMP
SGND
PGND
LEDGND
R RT
R CS
C COMP
Figure 5. Boost-Buck Configuration
18
Maxim Integrated
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