Datasheet

Quick Start
Recommended Equipment
Before beginning, the following equipment is needed:
• 25V, 1A power supply (VIN)
Procedure
The MAX8790A 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) Verify that the shunts are installed as follows:
2) Connect the positive terminal of the VIN power sup-
ply to the VIN pad on the EV kit and connect the
ground terminal of the VIN power supply to the
PGND pad on the EV kit.
3) Set the VIN power supply to 12V and enable its
output.
4) Verify that both WLED strings are lit.
Detailed Description
The MAX8790A EV kit is a high-efficiency WLED driver
that utilizes a step-up DC-DC converter optimized to gen-
erate the necessary output voltage for driving six strings
of WLEDs. The EV kit is powered by a 7V to 21V input
power supply and can be configured to provide a fixed
20mA or adjustable 15mA to 25mA full-scale LED current.
Evaluates: MAX8790A
MAX8790A Evaluation Kit
2 _______________________________________________________________________________________
Component Suppliers
Note: Indicate that you are using the MAX8790A when contacting these component suppliers.
Component List (continued)
DESIGNATION QTY DESCRIPTION
R1 1 51kΩ ±5% resistor (0603)
R2 1 100kΩ potentiometer, multiturn
R3 1 511kΩ ±1% resistor (0603)
R4 1 37.4kΩ ±1% resistor (0603)
R5 1 1MΩ ±1% resistor (0603)
R6 1
56mΩ ±1%, 0.5W resistor (1206)
IRC LRC-LRF-1206LF-01-R056-F
Vishay WSL1206R0560FEA18
R7 0
Not installed, resistor—short
(PC trace) (0603)
SUPPLIER PHONE WEBSITE
Fairchild Semiconductor 888-522-5372 www.fairchildsemi.com
IRC, Inc. 361-992-7900 www.irctt.com
KEMET Corp. 864-936-6300 www.kemet.com
Murata Electronics North America, Inc. 770-436-1300 www.murata-northamerica.com
Nichia Corp. 248-352-6575 www.nichia.com
Nihon Inter Electronics Corp. 847-843-7500 www.niec.co.jp
OPTEK Technologies 972-323-2200 www.optekinc.com
SANYO Electric Co., Ltd. 619-661-6835 www.sanyodevice.com
Sumida Corp. 847-545-6700 www.sumida.com
TDK Corp. 847-803-6100 www.component.tdk.com
Toshi b a Am eri ca E l ectr oni c C om p onents, Inc. 949-623-2900 www.toshiba.com/taec
Vishay 402-564-3131 www.vishay.com
DESIGNATION QTY DESCRIPTION
R8 1 1.2kΩ ±5% resistor (0603)
R9, R10 2 100kΩ ±5% resistors (0603)
R11–R16 0 Not installed, resistors (0603)
U1 1
Six-string white LED driver
(20 TQFN)
Maxim MAX8790AETP+
— 8 Shunts
— 1 PCB: MAX8790A Evaluation Kit+
JUMPER DEFAULT SHUNT POSITION
JU1, JU6, JU7 1-2
JU2, JU4 Not installed
JU3 2-3
JU5, JU12 Installed