MAX17061AEVKIT+

19-4654; Rev 0; 5/09
MAX17061A Evaluation Kit/Evaluation System
Features
The MAX17061A evaluation system (EV system) consists
of the MAX17061A evaluation kit (EV kit) and the Maxim
CMAXQUSB+ command module. Windows ® 2000-,
Windows XP®-, and Windows Vista®-compatible software
are also available for use with the EV system
(MAX17061AEVCMAXQU+) and can be downloaded from
the Maxim website (www.maxim-ic.com/evkitsoftware).
o 7V to 21V Input Range
o WLED Drives Up to 30mA/String
o Drives Four Strings of 10 WLEDs (Capable of
Driving Up to Eight Strings)
o Full-Scale LED Current Adjustable from 15mA to
30mA, or Preset 25mA
The MAX17061A EV kit (MAX17061AEVKIT+) is a fully
assembled and tested surface-mount PCB that evaluates
the high-efficiency MAX17061A white LED (WLED) driver.
The MAX17061A EV kit utilizes a step-up DC-DC converter to generate the voltage required to drive up to eight
strings of 10 surface-mount WLEDs. The EV kit is powered from dual supplies (VIN = 5.5V to 24V and VCC =
4.5V to 5.5V) and can be configured to provide a fixed
25mA or adjustable 15mA to 30mA full-scale LED current. As shipped, the MAX17061A EV kit is configured for
evaluation with four strings of 10 WLEDs and includes an
I2C/SMBus™-compatible interface that allows for software control of the brightness in 256 steps, backlightcontroller operating mode, manufacturer and silicon
revision detection, and fault detection.
o 1MHz PWM Switching Frequency (Selectable:
500kHz or 750kHz, Component Change Required)
o All Components < 1.2mm Height
o Lead(Pb)-Free and RoHS Compliant
The Maxim CMAXQUSB+ command module provides the
I2C/SMBus interface and is connected to the computer
through the universal serial bus (USB) port. The
MAX17061A EV kit software provides a graphical user
interface (GUI) for exercising the MAX17061A features.
o Fully Assembled and Tested
Ordering Information
PART
TYPE
EV Kit
MAX17061AEVKIT+
MAX17061AEVCMAXQU+
EV System
+Denotes lead(Pb)-free and RoHS compliant.
Note: The Maxim CMAXQUSB+ command module is required
when using the MAX17061A EV kit software.
Component Lists
MAX17061A EV System
PART
QTY
MAX17061AEVKIT
1
CMAXQUSB+
1
DESIGNATION
QTY
MAX17061A EV kit
C3
1
C4
0
Not installed, ceramic capacitor
(1206)
2
1.0µF ±10%, 10V X7R ceramic
capacitors (0603)
Taiyo Yuden LMK107BJ105KA
Murata GRM188R71A105K
C7–C12
6
0.33µF ±10%, 50V X7R ceramic
capacitors (1206)
Murata GRM319R71H334K
TDK C3216JB1H334K
C13–C20,
C22–C30
0
Not installed, ceramic capacitors
(0603)
I2C/SMBus interface command
module
MAX17061A EV Kit
DESIGNATION
C1
C2
QTY
1
1
DESCRIPTION
0.1µF ±10%, 50V X7R ceramic
capacitor (0603)
Murata GRM188R71H104K
TDK C1608X7R1H104K
0.022µF ±10%, 50V X7R ceramic
capacitor (0603)
Murata GRM188R71H223K
TDK C1608X7R1H223K
DESCRIPTION
4.7µF ±10%, 25V X5R ceramic
capacitor (1206)
Murata GRM319R61E475K
DESCRIPTION
C5, C6
Windows, Windows XP, and Windows Vista are registered
trademarks of Microsoft Corp.
SMBus is a trademark of Intel Corp.
________________________________________________________________ Maxim Integrated Products
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.
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Evaluate: MAX17061A
General Description
Evaluate: MAX17061A
MAX17061A Evaluation Kit/Evaluation System
Component Lists (continued)
MAX17061A EV Kit (continued)
DESIGNATION
C21
QTY
1
DESIGNATION
QTY
L1
1
10µH, 1.2A power inductor
Sumida CR6D09HPNP-100MC
TDK VLP6810T-100M1R2
R1
0
Not installed, resistor—short (PC
trace) (0603)
DESCRIPTION
220pF ±10%, 50V X7R ceramic
capacitor (0603)
Murata GRM188R71H221K
TDK C1608X7R1H221K
DESCRIPTION
Not installed, test point
R2
1
2.21MΩ ±1% resistor (0603)
1
61.9kΩ ±1% resistor (0603)
2
0.7A, 60V Schottky diodes (US-flat)
Toshiba CUS04
R3
R4
1
130kΩ ±5% resistor (0603)
R5
1
200kΩ multiturn potentiometer
D2–D41
40
White LEDs
Nichia NSSW008CT-P1
OPTEK OVSRWACR6
R6
1
41.2kΩ ±1% resistor (0603)
500kΩ multiturn potentiometer
D42–D81
0
Not installed, white LEDs
J1
1
JU1–JU4,
JU11, JU13
CCV
D1, D82
0
R7
1
R8, R9
0
Not installed, resistors (0603)
2 x 10 right-angle receptacle
R10
1
5.1kΩ ±5% resistor (0603)
6
3-pin headers
R11
1
1MΩ resistor (0603)
U1
1
JU5–JU8
0
Not installed, 3-pin headers—short
(PC trace)
WLED driver (28 thin QFN)
Maxim MAX17061AETI+
JU9
1
2-pin header
—
7
Shunts
—
1
PCB: MAX17061A EVALUATION KIT+
Component Suppliers
SUPPLIER
PHONE
WEBSITE
Murata Electronics North America, Inc.
770-436-1300
www.murata-northamerica.com
Nichia Corp.
248-352-6575
www.nichia.com
OPTEK Technologies
972-323-2200
www.optekinc.com
Sumida Corp.
847-545-6700
www.sumida.com
Taiyo Yuden
800-348-2496
www.t-yuden.com
TDK Corp.
847-803-6100
www.component.tdk.com
Toshiba America Electronic Components, Inc.
949-623-2900
www.toshiba.com/taec
Note: Indicate that you are using the MAX17061A when contacting these component suppliers.
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MAX17061A Evaluation Kit/Evaluation System
PART
DESCRIPTION
Installs the EV kit files on your
computer
INSTALL.EXE
MAX17061A.EXE
Application program
FTD2XX.INF
USB device driver file
UNINST.INI
Uninstalls the EV kit software
USB_Driver_Help.PDF
USB driver installation help file
Quick Start
Recommended Equipment
3) Carefully connect the boards by aligning the 20-pin
connector of the MAX17061A EV kit with the 20-pin
header on the CMAXQUSB+ interface board.
Gently press them together.
4) 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.
5) Connect the positive terminal of the VCC power
supply to the VCC pad. Connect the ground terminal of the VCC power supply to the GND pad.
6) Connect the USB cable from the computer’s typeA USB port to the CMAXQUSB+ board’s type-B
USB port.
7) Visit www.maxim-ic.com/evkitsoftware to obtain the
latest version of the EV kit software, 17061ARxx.ZIP.
Download and install it on your computer by running the INSTALL.EXE program. The program files
are copied and icons are created in the Windows
Start menu.
•
MAX17061A EV system
MAX17061A EV kit
Maxim CMAXQUSB+ command module
(USB cable included)
•
7V to 21V, 1A power supply (VIN)
•
User-supplied Windows 2000, Windows XP, or
Windows Vista PC
8) Set the VIN power supply to 12V and enable its output.
•
Available USB port
9) Set the VCC power supply to 5V and enable its output.
Note: In the following sections, software-related items
are identified by bolding. Text in bold refers to items
directly from the EV kit software. Text in bold and
underlined refers to items from the Windows operating
system.
Procedure
The MAX17061A 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 CMAXQUSB+ command module, ensure
that the shunt on jumper JU1 is in the 5V (default)
position.
2) On the MAX17061A EV kit, verify that the shunts are
installed as follows:
JU1–JU4, JU13
1-2
JU9
Installed
JU11
2-3
10) Start the MAX17061A program by opening its icon
in the Start menu.
11) Normal device operation is verified when CMAXQUSB
HW: Connected. MAX17061A device connected.
is displayed at the bottom left of the MAX17061A EV
kit window (Figure 1).
Detailed Description of Software
User-Interface Panel
The program’s main window (Figure 1) is navigated by
using a mouse or a combination of the keyboard’s tab
and arrow keys. The MAX17061A EV kit software provides controls for software-configurable features, such
as Brightness Control, Device Control, Faults/Status
detection, and Manufacturer ID and Silicon Revision
detection. Changes to the controls result in a write
operation that updates the appropriate registers of the
MAX17061A. A status box is provided at the bottom of
the program’s main window and is used to verify command module and device connectivity. A Device
Search option is located under the Action menu bar
should the user want to switch from demo mode to normal operation.
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MAX17061A EV Kit Files
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MAX17061A Evaluation Kit/Evaluation System
Figure 1. MAX17061A EV Kit Software Main Window
Brightness Control and Level
Fault/Status Detection
The MAX17061A can be configured to one of any 256
steps of brightness control. To set the brightness, slide
the Brightness Control track bar to the desired position, from 0 to 255. The track-bar position is then displayed in the Brightness Level group box.
The MAX17061A’s fault/status read-only register monitors the backlight controller’s operating state. This register detects the backlight on/off state, whether one or two
LED output channels are shut down, overcurrent conditions, and thermal faults. When a fault is detected, the
corresponding bit is changed from logic 0 to logic 1 and
the font color is changed to red. Refer to the
MAX17061A IC data sheet for more information regarding the fault/status register.
Device Control
The MAX17061A’s device control register controls the
operating mode of the backlight controller and backlight
on/off states. The MAX17061A operating mode can be
configured according to the bit settings shown in Table 1.
Table 1. Operating Modes Selected by
Device Control Register
PWM_MD
PWM_SEL
OPERATING MODE
X
1
PWM mode
1
0
SMBus mode
0
X = Don’t care.
0
SMBus mode with DPST
4
Manufacturer/Silicon Revision Detection
The ID Register group box provides the manufacturer
and silicon revision information for the MAX17061A IC.
This information is read upon initial startup.
Simple I2C/SMBus Commands
There are two methods for communicating with the
MAX17061A, through the normal user interface (Figure
1), or through the SMBus commands available by
selecting the Interface Diagnostic Window menu item
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MAX17061A Evaluation Kit/Evaluation System
Evaluate: MAX17061A
Figure 2. Interface Diagnostic Window
from the Action menu bar. The Maxim Command
Module Interface window pops up (Figure 2) and
includes a 2-wire interface tab that allows for execution of simple I2C/SMBus commands.
The SMBus edit boxes in the Command (SMBus
Protocols, Raw Block Read/Write, EEPROM
Read/Write) group box accept numeric data in binary,
decimal, or hexadecimal. Hexadecimal numbers should
be prefixed by $ or 0x. Binary numbers must be exactly
eight digits. See Figure 2 for an illustration of this tool.
kit evaluates the MAX17061A WLED driver and the
CMAXQUSB+ provides the I2C/SMBus-compatible interface for software control of the LED brightness in 256
steps, backlight-controller operating mode, manufacturer
and silicon revision detection, and fault detection.
The MAX17061A EV kit is powered from a 5.5V to 24V
DC supply at VIN and a 4.5V to 5.5V DC supply at VCC.
LED current can be configured to provide a fixed 25mA
or adjustable 15mA to 30mA full-scale LED current
through jumper JU11 and/or resistor R5.
Detailed Description of Hardware
The MAX17061A EV kit utilizes a step-up DC-DC converter to generate the voltage required to drive up to
eight strings of 10 surface-mount WLEDs. As shipped,
the MAX17061A EV kit is configured for evaluation with
four strings of 10 WLEDs.
The MAX17061A EV system (MAX17061AEVCMAXQU+)
consists of the MAX17061A EV kit (MAX17061AEVKIT+)
and the Maxim CMAXQUSB+ command module. The EV
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MAX17061A Evaluation Kit/Evaluation System
White LED String Configuration
As configured, the MAX17061A EV kit is assembled
with four strings of 10 WLEDs (string 1–string 4), but
can be reconfigured to drive up to eight strings of 10
WLEDs. Each string has an associated 3-pin header
(JU1–JU8) and feedback pin (FB1–FB8). To evaluate
additional strings (string 5–string 8), the EV kit must be
reconfigured as follows:
1) Populate String_ with either the WLED listed in the
Component List, or its equivalent.
2) Cut the trace (solder side) between pins 2-3 of the
string’s associated header-footprint (JU5–JU8).
3) Install a 3-pin header (JU5–JU8) and configure its
shunt according to Table 2.
To evaluate the EV kit with off-board WLED strings, see
the Off-Board White LED String Configuration section.
Off-Board White LED String Configuration
The MAX17061A EV kit can also be used to drive offboard WLED strings. To evaluate external WLED
strings, remove the shunts from jumpers JU1–JU8. See
Table 2 for jumpers JU1–JU8 configuration and Table 3
for jumper JU9 configuration. Removing these jumpers
Table 2. Jumper JU1–JU8 Function
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–FB8) 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 FB_ 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 component changes. Refer to the
MAX17061A IC data sheet for component selections.
LED String Capacitance
In some LCD panel applications, a 0.1µF (typ) capacitor
(C LED ) is placed in parallel with each LED string
to improve ESD immunity. As such, the MAX17061A EV
kit provides a footprint across each LED string in addition to footprints for pullup resistors on each FB_ pin.
Refer to the LCD Panel Capacitance section in the
MAX17061A IC data sheet for more detailed information.
Setting Full-Scale LED Current (ILED(FS))
The full-scale current through each WLED string is configured by connecting the ISET pin (pin 24) to VCC or
connecting it to GND through resistors R4 and R5.
When ISET is connected to VCC, the full-scale current
per string is set to 25mA; when pulled to GND, the fullscale current per string is adjustable from 15mA to
30mA:
SHUNT
POSITION
FB_ PIN
STRING_
1-2
Connected to cathode of
WLED string
Enabled
2-3
Connected to VCC
Disabled
200kΩ ⎞
⎛
ILED(FS) = ⎜ 20 ×
⎟ mA
⎝
R4 + R5 ⎠
Not
installed
Connect to an external
WLED string
On-board WLED
string not used
where R4 is a 130kΩ resistor and R5 is a 200kΩ potentiometer. The ISET pin is configured through jumper
Table 3. Jumper JU9 Function
Table 4. Jumper JU11 Function
SHUNT
POSITION
VOUT
SHUNT
POSITION
ISET PIN
ILED(FS)
Installed*
Connected to anodes of on-board WLED strings
1-2
Connected to VCC
25mA
Not
installed
Connect to anodes of off-board WLED strings
2-3*
Connected to GND
through R4 and R5
Adjustable from
15mA to 30mA
*Default position.
6
*Default position.
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MAX17061A Evaluation Kit/Evaluation System
SHUNT
POSITION
OSC PIN
OPERATING
FREQUENCY
1-2*
Connected to VCC
1MHz
2-3
Connected to GND
500kHz
Not
installed
Unconnected
750kHz
*Default position.
JU11. See Table 4 for jumper JU11 settings.
Switching-Frequency Selection (OSC)
The MAX17061A EV kit is configured to operate at
1MHz, but provides the option to set the switching frequency of the step-up DC-DC converter to 500kHz or
750kHz. The switching frequency is set by configuring
JU13 to the shunt position, as shown in Table 5.
Changing the switching frequency could require differ-
ent converter components (refer to the MAX17061A IC
data sheet for proper component selections).
Setting DPWM Frequency (fDPWM)
The MAX17061A uses an internal DPWM signal to perform
dimming control. The DPWM frequency is specified by an
external resistor, connected from the FSET pin to GND:
fDPWM[Hz] =
109
109
=
α × RFSET + α × β × 1000 α × RFSET + γ
where α = 10.638, β = 5.5, γ = 58509.
The adjustable range for the FSET resistor (RFSET) is
from 64kΩ to 465kΩ, corresponding to the DPWM frequency of 1350Hz to 200Hz. RFSET consists of resistors R6 and R7 on the EV kit, where R6 is a 41.2kΩ
resistor and R7 is a 500kΩ potentiometer. If making
adjustments, note that the minimum usable frequency
results from a maximum resistance of 465kΩ.
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Evaluate: MAX17061A
Table 5. Jumper JU13 Function
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MAX17061A Evaluation Kit/Evaluation System
Figure 3. MAX17061A EV Kit Schematic
8
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MAX17061A Evaluation Kit/Evaluation System
Evaluate: MAX17061A
Figure 4. MAX17061A EV Kit Component Placement Guide—Component Side
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MAX17061A Evaluation Kit/Evaluation System
Figure 5. MAX17061A EV Kit PCB Layout—Component Side
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MAX17061 Evaluation Kit/Evaluation System
Evaluate: MAX17061A
Figure 6. MAX17061A EV Kit PCB Layout—Solder Side
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
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Maxim is a registered trademark of Maxim Integrated Products, Inc.