MAX16807EVKIT+ Maxim Integrated Products, MAX16807EVKIT+ Datasheet - Page 14

• Manufacturer Part Number: MAX16807EVKIT+
• Description: EVAL KIT FOR MAX16807
• Manufacturer: Maxim Integrated Products

Specifications of MAX16807EVKIT+

• Current - Output / Channel: 50mA
• Outputs And Type: 8, Non-Isolated
• Voltage - Output: 32V
• Features: Dimmable
• Voltage - Input: 9 ~ 16V
• Utilized Ic / Part: MAX16807
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The oscillator frequency is then:
REF is a 5V reference output that can source 20mA.
Bypass REF to AGND with a 0.1µF capacitor.
The MAX16807 includes a fast current-limit comparator
to terminate the on cycle during an overload or a fault
condition. The current-sense resistor, R
between the source of the external MOSFET and
AGND, sets the current limit. The CS input has a volt-
age trip level (V
to calculate R
Integrated 8-Channel LED Driver with
Switch-Mode Boost and SEPIC Controller
Figure 2. Buck-Boost (SEPIC) Configuration
14
______________________________________________________________________________________
3V TO 5.5V
CS
CS
:
CLOCK INPUT
f
) of 0.3V. Use the following equation
OSC
EXTERNAL
DIM INPUT
R
EXTERNAL
V
SET
IN
C
BYP
C
IN
=
(
t
C
V
V+
PGND
DIN
LE
CLK
DOUT
OE
SET
OUT CS AGND
CC
+
1
L1
C
REF
Reference Output
t
D
REF
)
Current Limit
MAX16807
CS
Q
R
R
CS
T
COMP
, connected
C1
C
L2
T
C
RTCT
C1
C
C2
D
OUT0
OUT1
OUT2
OUT3
OUT4
OUT5
OUT6
OUT7
R
C
C1
FB
OUT
I
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.
Figure 2 shows a buck-boost application circuit using
the MAX16807 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
below or above V
R1
R2
P-P
V
OUT
is the peak current that flows through the MOSFET.
Buck-Boost (SEPIC) Operation
IN
R
.
CS
=
I
V
P P
CS
−
LEDs
OUT
can be