MAX17127EVKIT+ Maxim Integrated Products, MAX17127EVKIT+ Datasheet - Page 3

• Manufacturer Part Number: MAX17127EVKIT+
• Description: Power Management Modules & Development Tools MAX17127 EVAL KIT MAX17127 EVAL KIT
• Manufacturer: Maxim Integrated Products

Specifications of MAX17127EVKIT+

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

Table 3. Jumper Function (JU13)
As configured, the EV kit is assembled with six strings of
10 WLEDs. Each string has an associated 3-pin header
(JU1, JU8–JU12) and feedback pin (FB1–FB6). The
function of the 3-pin jumpers is summarized in Table 2.
To evaluate the EV kit with off-board WLED strings, see
the Off-Board WLED String Configuration section.
The EV kit can also be used to drive off-board WLED
strings. To evaluate external WLED strings, reconfigure
shunts from jumpers JU1 and JU8–JU12. See Table 2
for jumpers JU1 and JU8–JU12 configuration and Table
3 for jumper JU13 configuration. Removing these jump-
ers effectively disconnects the on-board WLED strings
between the output and feedback pins, allowing the
connection of external WLED strings. For each external
WLED string, connect the cathode terminal of the string to
the corresponding feedback pad (FB1–FB6) and connect
the anode terminal of the string to the VOUT pad. Once the
external WLED strings are connected between the VOUT
pad and the FB1–FB6 pins, the EV kit can be evaluated in
the same manner as the on-board WLED strings. Evaluating
more than 10 WLEDs per string may require compo-
nent changes. Refer to the MAX17127 IC data sheet for
component selections.
The EV kit features 2-pin jumper JU16 to control the active-
low shutdown input. Drive EN high to place the device in
normal operation. If the JU16 shunt is removed, an internal
200kI (typ) pulldown resistor places the device in disabled
mode. See Table 4 for shunt positions.
*Default position.
*Default position.
Table 2. Jumper Function (JU1, JU8–JU12)
Not installed
POSITION
SHUNT POSITION
SHUNT
1-2*
2-3
Not installed
Installed*
Connected to cathode
Connect to an external
Off-Board WLED String Configuration
White LED String Configuration
Connected to AGND
_______________________________________________________________________________________
of WLED string
WLED string
FB_ PIN
Connected to anodes of on-board
Connect to anodes of off-board
WLED strings
WLED strings
VOUT
On-board WLED
string not used
Enable (EN)
STRING_
Disabled
Enabled
MAX17127 Evaluation Kit
The EV kit features 2-pin jumper JU20 to implement
brightness control through the PWM signal input. See
Table 5 for shunt positions.
In some LCD panel applications, a 0.1FF (typ) capaci-
tor (C
improve ESD immunity. As such, the EV kit provides a
footprint across each LED string for optional C
The EV kit features 3-pin jumper JU6, along with R8 and
R14, to set the full-scale LED current. The resistance
from ISET to AGND controls the full-scale current in each
LED string according to the following equation:
where R8 is a 100kI resistor and R14 is a 500kI poten-
tiometer. See Table 6 for jumper JU6 settings.
The EV kit is configured to operate at 1MHz, but provides
the option to set the switching frequency of the step-up
DC-DC converter from 250kHz to 1MHz. The switching
frequency is set by adjusting the resistance from FSLCT
to AGND according to the following equation:
Changing the switching frequency might require differ-
ent converter components (refer to the MAX17127 IC
data sheet for proper component selections).
*Default position.
Table 4. Jumper Function (JU16)
Not installed
POSITION
Installed*
Full-Scale LED Current Adjustment (ISET)
SHUNT
Switching-Frequency Selection (FSLCT)
LED
) is placed in parallel with each LED string to
I
LED(MAX)
Internally connected to AGND
f
SW
LED String Capacitance
Connected to VDDIO
Brightness Control by PWM
=
1 MHz
=



EN PIN
20
×
× 
R8 R14


180k
100k
Signal Input (PWM)
R10
+
Ω
Ω 





mA
MAX17127
Disabled
Enabled
LED
.
3