MAX16826ATJ+ Maxim Integrated Products, MAX16826ATJ+ Datasheet - Page 22

• Manufacturer Part Number: MAX16826ATJ+
• Description: LED Drivers Programmable Four-St ring HB LED Driver w
• Manufacturer: Maxim Integrated Products

Specifications of MAX16826ATJ+

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The SEPIC power topology is very useful when the
input voltage is expected to be higher or lower than the
output voltage of the switching regulator stage as
required by the number of LEDs used in a single string.
Programmable, Four-String HB LED Driver with
Output-Voltage Optimization and Fault Detection
22
Figure 9. SEPIC-Based LED Driver
SYSTEM
GND
______________________________________________________________________________________
µC
ENABLE
DIM
SDA
SCL
GND
GND
V
IN
C26
C30
DIM1
DIM2
DIM3
DIM4
SDA
SCL
SYNC/EN
GND
GND
CSS
IN
I
2
DIMMING INPUTS
C INTERFACE
C27
R11
C33
GND
RTCT
GND
DL
MAX16826
R17
L1
R19
RSC
C32
SEPIC Topology
GND
V
CS
CC
R12
GND
GND
Q1
GND
COMP
PGND
C25
GND
OVP
DR4
DR3
DR2
DR1
CS1
CS2
CS3
CS4
DL1
DL2
DL3
DL4
C29
GND
FB
D1
L2
R18
GND
R27
C28
R25
GND
The SEPIC topology is more complex than the simple
boost topology and it requires the use of two additional
energy storage components, L2 and C25, in Figure 9.
R13
R14
R23
GND
R21
R15
R16
R32
R20
C44
R31
Q5
R33
R22
C43
R30
Q4
R34
R24
C42
R29
Q3
R26
R35
C41
V
R28
OUT
Q2
GND