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19-3314; Rev 0; 6/04
MAX8722 Evaluation Kit
General Description
The MAX8722 evaluation kit (EV kit) is an assembled and tested PC board that demonstrates the MAX8722 low-cost, cold-cathode fluorescent lamp (CCFL), backlight controller. Lamp brightness is adjustable by an onboard potentiometer. +7V to +24V Input Range Open-Lamp Protection with 1s Timeout Secondary Short-Circuit Protection with 10ms Timeout Brightness Adjustable by an On-Board Potentiometer 10:1 Digital Pulse-Width Modulation (DPWM) Dimming Range Strike Voltage Up to 1.6kV High Power to Light Efficiency Assembled and Tested
Features
Evaluates: MAX8722
Ordering Information
PART MAX8722EVKIT TEMP RANGE 0C to +70C IC PACKAGE 24 QSOP
Component List
DESIGNATION QTY DESCRIPTION 4.7F 20%, 25V X5R ceramic capacitor (1210) Murata GRM32RR61E475K Taiyo Yuden TMK325BJ475MN TDK C3225X7R1E475M 1F 10%, 25V X7R ceramic capacitor (1206) Murata GRM31MR71E105K Taiyo Yuden TMK316BJ105KL TDK C3216X7R1E105K 18pF 10%, 3kV HV ceramic capacitor (1808) TDK C4520C0G3F180K 0.015F 10%, 16V X7R ceramic capacitor (0402) Murata GRP155R71C153K Taiyo Yuden EMK105BJ153KV TDK C1005X7R1C153K 0.1F 10%, 10V X5R ceramic capacitors (0402) Murata GRP155R61A104K Taiyo Yuden LMK105BJ104KV TDK C1005X5R1A104K DESIGNATION QTY DESCRIPTION 0.47F 10%, 10V X5R ceramic capacitors (0402) Murata GRM155R60J474K TDK C1005X5R0J474K 0.1F 10%, 25V X7R ceramic capacitor (0603) Murata GRM188R71E104K Taiyo Yuden TMK107BJ104KA TDK C1608X7R1E104K Not installed (0603) 0.01F 10%, 25V X7R ceramic capacitor (0402) Murata GRP155R71E103K Taiyo Yuden TMK105BJ103KV TDK C1005X7R1E103K 0.22F 10%, 6.3V X5R ceramic capacitor (0402) Taiyo Yuden JMK105BJ224KV TDK C1005X5R0J224K Shrouded header for CCFL lamp connection, 3.5mm pin spacing, PC board mount JST SM02B-BHSS-1-TB
C1
1
C7, C9
2
C2
1
C8
1
C10
0
C3
1
C11
1
C4
1
C12
1
C5, C6, C13
3
CN1
1
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For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
MAX8722 Evaluation Kit Evaluates: MAX8722
Component List (continued)
DESIGNATION QTY DESCRIPTION Dual Schottky diode, Common Anode, SOT-323 Central Semiconductor CMSSH-3A Diodes Incorporated BAT54AW Fuse, 2A, 32V (1206) AVX F1206A2R00FWTR 2-pin header Not installed (0603) 3-pin header Dual n-channel MOSFETs, 30V, 0.095, SOT23-6 Fairchild FDC6561AN 150 1% resistor (0402) U1 1 R9 R10 1 1 DESIGNATION QTY DESCRIPTION R2, R11 0 Not installed (0402) R3 R4 R5 R6 R7, R8 1 1 1 1 2 40.2 1% resistor (0603) 200k 1% resistor (0402) 100k 1% resistor (0402) 169k 1% resistor (0603) 100k 5% resistors (0402) 100k potentiometer (multiturn), 3/8" square 1k 5% resistor (0402) CCFL transformer, 93:1 Sumida 5371-400-W1423 (CIUH8D42 style) TOKO T912MG-1018 (BLC103B style) MAX8722EEG (24 QSOP)
D1
1
F1 JU1 JU2 JU3 N1A/B, N2A/B R1
1 1 0 1 2 1
T1
1
Component Suppliers
SUPPLIER AVX Central Semiconductor Diodes Incorporated Fairchild Semiconductor JST Murata Sumida Taiyo Yuden TDK TOKO PHONE 843-946-0238 631-435-1110 805-446-4800 888-522-5372 847-473-1957 770-436-1300 847-545-6700 800-348-2496 847-803-6100 847-297-0070 FAX 843-626-3123 631-435-1824 805-446-4850 972-910-8036 847-473-0144 770-436-3030 847-545-6720 847-925-0899 847-390-4405 847-699-1194 WEBSITE www.avxcorp.com www.centralsemi.com www.diodes.com www.fairchildsemi.com www.jst.com www.murata.com www.sumida.com www.t-yuden.com www.component.tdk.com www.tokoam.com
Note: Indicate you are using the MAX8722 when contacting these manufacturers.
Quick Start
Recommended Equipment
Before you begin, you need the following equipment: * A DC power supply capable of supplying a voltage between +7V to +24V at 2A to power the MAX8722 board
*
A CCFL lamp with the following specifications:
Maximum RMS strike voltage 1.6kV RMS lamp current 6mA Input power 4W Warning: High voltages are present on this evaluation kit. Use caution when making connections and applying power! Do not turn on the power until all connections are made!
2
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MAX8722 Evaluation Kit
Procedure
1) Connect the lamp to the connector CN1. 2) Connect the +7V to +24V supply to the pads labeled VIN and GND on the MAX8722 EV kit. 3) Turn on the power supply. 4) Enable the MAX8722 by removing the shunt on JU1.
Shutdown
A shunt installed on JU1 places the MAX8722 in shutdown mode.
Evaluates: MAX8722
DPWM Chopping Frequency (Jumpers JU2 and JU3 and Resistor R6)
Resistor R6 sets the DPWM chopping frequency (fDPWM) according to the following equation: fDPWM (Hz) = 209Hz x 169k R6
Detailed Description
Brightness
The brightness of the lamp is adjustable by turning potentiometer R9.
The MAX8722 EV kit is shipped with R6 equal to 169k, which sets fDPWM to 209Hz.
Table 1. Jumper and Resistor Settings
JU2 Open Short JU3 2-3 Open. Connect SYNC to an external high frequency (between 13kHz and 45kHz). 1-2 R6 169k Open DPWM PIN DPWM is used as an output. DPWM is used as an output. Connect DPWM to an external low-frequency signal (between 100Hz and 350Hz). FREQUENCY fDPWM = 209Hz fDPWM = fEXT / 128
Open
169k
fDPWM = fEXT
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3
MAX8722 Evaluation Kit Evaluates: MAX8722
VIN
F1 2A R11 SHORT 1 C8 0.1F 24 23 R7 100k C9 0.47F 2 R4 200k 1% JU1 3 R8 100k R5 100k 1% 5 R9 100k 2 3 JU2 1 R10 1k R6 169k 1% 7 SYNC C13 0.1F 8 FREQ PGND GL2 GH2 VFB 6 DPWM ISEC IFB CNTL GL1 19 3 2 21 20 13 11 12 10 SHDN BATT GND VCC BST2 15 2 R L 1 22 D1 3 C7 0.47F C1 4.7F 25V
GND VDD
VCC
VCC
ON/OFF
BST1 GH1
16 18 C6 0.1F 3
4 N2-B 2 LX1 C5 0.1F N2-A
6 1 5
ILIM
U1 MAX8722
LX1 LX2 17 14
LX2
BRIGHTNESS
4 N1-B N1-A
6 1 5
SYNC
JU3 1 3 2
DPWM
VFB ISEC IFB
9 C11 0.01F 4 C12 0.22F
COMP TFLT
Figure 1. MAX8722 EV Kit Schematic
4
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MAX8722 Evaluation Kit Evaluates: MAX8722
C2 1F LX1 4 T1 6 1 HL CN1
LX2
2
10
C3 18pF
2
LV
ISEC R3 40.2 1%
VFB C10 OPEN R2 OPEN
IFB C4 0.015F R1 150 1%
Figure 2. MAX8722 EV Kit Schematic--High-Voltage Section
Figure 3. MAX8722 EV Kit Component Placement Guide--Component Side
Figure 4. MAX8722 EV Kit PC Board Layout--Component Side
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5
MAX8722 Evaluation Kit Evaluates: MAX8722
Figure 5. MAX8722 EV Kit PC Board Layout--Layer 2
Figure 6. MAX8722 EV Kit PC Board Layout--Layer 3
Figure 7. MAX8722 EV Kit PC Board 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.
6 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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