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Integrated 16-Channel LED Driver with
Switch-Mode Boost and SEPIC Controller
f OSC =
R CS =
The oscillator frequency is then:
1
( t C + t D )
Reference Output
REF is a 5V reference output that can source 20mA.
Bypass REF to AGND with a 0.1μF capacitor.
Current Limit
The MAX16809 includes a fast current-limit comparator
to terminate the ON cycle during an overload or a fault
condition. The current-sense resistor, R CS , connected
between the source of the external MOSFET and
AGND, sets the current limit. The CS input has a volt-
age trip level (V CS ) of 0.3V. Use the following equation
to calculate R CS :
V CS
I P ? P
I P-P is the peak current that flows through the MOSFET.
When the voltage produced by this current (through the
current-sense resistor) exceeds the current-limit com-
parator threshold, the MOSFET driver (OUT) turns the
switch off within 60ns. In most cases, a small RC filter is
required to filter out the leading-edge spike on the
sense waveform. Set the time constant of the RC filter at
50ns.
Buck-Boost (SEPIC) Operation
Figure 2 shows a buck-boost application circuit using
the MAX16809 in a stand-alone mode of operation.
SEPIC topology is necessary when the total forward
voltage of the LEDs in a string is such that V OUT can be
below or above V IN .
V IN
L1
C 1
D
V OUT
C OUT
Q1
L2
R1
R CS
C C1
C C2
R C1
R2
3V TO 5.5V
C IN
C BYP
OUT CS AGND
V CC
V+
PGND
COMP
FB
OUT0
OUT1
OUT2
OUT3
DIN
LE
MAX16809
OUT4
OUT5
OUT6
EXTERNAL
CLOCK INPUT
EXTERNAL
DIM INPUT
CLK
DOUT
OE
OUT7
OUT8
OUT9
OUT10
OUT11
OUT12
OUT13
OUT14
SET
REF
RTCT
OUT15
R SET
C REF
R T
C T
Figure 2. Buck-Boost (SEPIC) Operation
14
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