19-5449; Rev 0; 7/10
MAX17127 Evaluation Kit
General Description
The MAX17127 evaluation kit (EV kit) is a fully assembled
and tested surface-mount PCB that evaluates the high-
efficiency MAX17127 white LED (WLED) driver. The EV
kit utilizes a step-up DC-DC converter to generate the
voltage required to drive up to six strings of 10 surface-
mount WLEDs. The EV kit uses a 5V to 26V input power
supply and can be configured to provide an adjustable
10mA to 30mA full-scale LED current.
S
5V to 26V Input Range
S
WLED Drives Up to 30mA/String
S
Drives Six Strings of 10 WLEDs
S
Full-Scale LED Current Adjustable from 10mA to
Features
Evaluates: MAX17127
30mA
S
1MHz PWM Switching Frequency Adjustable from
250kHz to 1MHz (Component Change Required)
S
All Components < 1mm Height
S
Fully Assembled and Tested
Ordering Information
PART
TYPE
MAX17127EVKIT+
EV Kit
+Denotes
lead(Pb)-free and RoHS compliant.
Component List
DESIGNATION
QTY
DESCRIPTION
0.1FF
Q10%,
50V X7R ceramic
capacitor (0603)
Murata GRM188R71H104K
TDK C1608X7R1H104K
Not installed, ceramic capacitors
(0603)
510pF
Q5%,
50V C0G ceramic
capacitor (0603)
Murata GRM1885C1H511J
AVX 06035A511JA12A
1FF
Q10%,
10V X7R ceramic
capacitor (0603)
Taiyo Yuden LMK107BJ105KA
Murata GRM188R71A105K
Not installed, ceramic capacitors
(1206)
2.2FF
Q20%,
50V X7R ceramic
capacitors (1206)
Murata GRM31CR71H225K
4.7FF
Q10%,
25V X5R ceramic
capacitor (1206)
Murata GRM319R61E475K
DESIGNATION
D1
QTY
1
DESCRIPTION
0.7A, 60V Schottky diode
(US Flat)
Toshiba CUS04
White LEDs
Nichia NSSW008CT-P1
OPTEK OVSRWACR6
3-pin headers
Not installed, 2-pin header—
short PC trace
Not installed, 3-pin header
(pins 2-3—short PC trace)
2-pin headers
10FH, 1.2A power inductor
Sumida CR6D09HPNP-100MC
TDK VLP6810T-100M1R2
100kI
Q5%
resistors (0603)
1MI
Q5%
resistor (0603)
0I
Q5%
resistor (0603)
10kI
Q5%
resistor (0603)
C1
1
C2–C8,
C10–C16, C24
0
D2–D61
JU1, JU6,
JU8–JU12
JU2
JU7
JU4,
JU13–JU19,
JU20, JU21
L1
R1, R8, R10
R2
R3
R4
60
7
0
0
C9
1
C17
1
10
C18, C22, C23
0
1
3
1
1
1
C19, C21
2
C20
1
_______________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
MAX17127 Evaluation Kit
Evaluates: MAX17127
Component List (continued)
DESIGNATION
R5
R6
R7
R11
R12
R14
QTY
1
1
1
0
0
2
DESCRIPTION
82.5kI
Q1%
resistor (0603)
2.21MI
Q1%
resistor (0603)
71.5kI
Q1%
resistor (0603)
Not installed, resistor (0603)
Not installed, multiturn
potentiometer
500kI multiturn potentiometer
—
—
*EP
= Exposed pad.
17
1
U1
1
DESIGNATION
QTY
DESCRIPTION
Six-string WLED driver
(20 TQFN-EP*)
Maxim MAX17127ETP+
Shunts
PCB: MAX17127 EVALUATION
KIT+
Component Suppliers
SUPPLIER
AVX Corporation
Murata Electronics North America, Inc.
Nichia Corp.
OPTEK Technologies
Sumida Corp.
Taiyo Yuden
TDK Corp.
PHONE
843-946-0238
770-436-1300
248-352-6575
972-323-2200
847-545-6700
800-348-2496
847-803-6100
www.avxcorp.com
www.murata-northamerica.com
www.nichia.com
www.optekinc.com
www.sumida.com
www.t-yuden.com
www.component.tdk.com
WEBSITE
Toshiba America Electronic Components, Inc.
949-623-2900
www.toshiba.com/taec
Note:
Indicate that you are using the MAX17127 when contacting these component suppliers.
Quick Start
• MAX17127 EV kit
• 5V to 26V power supply (VIN)
Table 1. Default Shunt Positions
JUMPER
JU1, JU6, JU8–JU12
JU4, JU14, JU15,
JU17–JU20, JU21
JU13, JU16
SHUNT POSITION
1-2
Not installed
Installed
Recommended Equipment
Procedure
The EV kit is fully assembled and tested. Follow the
steps below to verify board operation.
Caution: Do not
turn on the power supply until all connections are
completed.
1) On the EV kit, verify that the shunts are installed, as
shown in Table 1.
2) Connect the positive terminal of the VIN power
supply to the VIN pad. Connect the ground terminal
of the VIN power supply to the PGND pad.
3) Set the VIN power supply to 12V and enable its output.
4) Verify that the six strings of WLEDs are on.
Detailed Description of Hardware
The MAX17127 evaluation kit (EV kit) operates on a 5V
to 26V wide-input voltage range and provides adjust-
able 10mA to 30mA full-scale LED current. The EV kit
utilizes a step-up DC-DC converter to generate the
voltage required to drive up to six strings of 10 surface-
mount WLEDs.
2
______________________________________________________________________________________
MAX17127 Evaluation Kit
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.
Off-Board WLED String Configuration
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.
White LED String Configuration
Brightness Control by PWM
Signal Input (PWM)
The EV kit features 2-pin jumper JU20 to implement
brightness control through the PWM signal input. See
Table 5 for shunt positions.
Evaluates: MAX17127
LED String Capacitance
In some LCD panel applications, a 0.1FF (typ) capaci-
tor (C
LED
) is placed in parallel with each LED string to
improve ESD immunity. As such, the EV kit provides a
footprint across each LED string for optional C
LED
.
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:
180k
Ω
I
LED(MAX)
=
20
×
mA
R8
+
R14
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:
100k
Ω
f
SW
=
1 MHz
×
R10
Full-Scale LED Current Adjustment (ISET)
Switching-Frequency Selection (FSLCT)
Enable (EN)
Table 2. Jumper Function (JU1, JU8–JU12)
SHUNT
POSITION
1-2*
2-3
Not installed
*Default
position.
FB_ PIN
Connected to cathode
of WLED string
Connected to AGND
Connect to an external
WLED string
STRING_
Enabled
Disabled
On-board WLED
string not used
Changing the switching frequency might require differ-
ent converter components (refer to the MAX17127 IC
data sheet for proper component selections).
Table 4. Jumper Function (JU16)
SHUNT
POSITION
Installed*
Not installed
*Default
position.
EN PIN
Connected to VDDIO
Internally connected to AGND
MAX17127
Enabled
Disabled
Table 3. Jumper Function (JU13)
SHUNT POSITION
Installed*
Not installed
*Default
position.
_______________________________________________________________________________________
3
VOUT
Connected to anodes of on-board
WLED strings
Connect to anodes of off-board
WLED strings
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