19-3932; Rev 0; 1/06
MAX8751 Evaluation Kit
General Description
The MAX8751 evaluation kit (EV kit) is an assembled
and tested PC board that demonstrates the MAX8751
low-cost multiple CCFL backlight controller. Lamp
brightness is adjustable by an on-board potentiometer.
o
+8V to +24V Input Range
o
Brightness Adjustable by an On-Board
Potentiometer
o
10:1 Dimming Range
o
Lamp-Out Detection with Timeout
o
Secondary Current Limit with Timeout
o
Strike Voltage Up to 1.6kV
o
High Power to Light Efficiency
o
Fully Assembled and Tested
Features
Evaluates: MAX8751
Component Suppliers
SUPPLIER
Central
Semiconductor
Diodes
Incorporated
Fairchild
Semiconductor
JST
Kemet
Murata
Sumida
TDK
Vishay
Semiconductor
PHONE
WEBSITE
631-435-1110 www.centralsemi.com
805-446-4800 www.diodes.com
888-522-5372 www.fairchildsemi.com
847-473-1957 www.jst.com
864-963-6300 www.kemet.com
770-436-1300 www.murata.com
847-545-6700 www.sumida.com
847-803-6100 www.component.tdk.com
402-564-3131 www.vishay.com
Ordering Information
PART
MAX8751EVKIT
TEMP RANGE
0°C to +70°C
IC PACKAGE
32 TQFN-EP*
*EP
= Exposed paddle.
Note:
Indicate you are using the MAX8751 when contacting
these manufacturers.
Component List
DESIGNATION QTY
C1
1
DESCRIPTION
22µF
±20%,
25V X5R ceramic
capacitor (1812)
TDK C4532X5R1E226M
0.1µF
±10%,
25V X7R ceramic
capacitors (0603)
Kemet C0603C104K3RAC
Murata GRM188R71E104K
TDK C1608X7R1E104K
1µF
±10%,
10V X5R ceramic
capacitor (0603)
Kemet C0603C105K8RAC
Murata GRM188R61A105K
TDK C1608X5R1A105K
0.22µF
±10%,
16V X7R ceramic
capacitor (0603)
Kemet C0603C224K4RAC
Murata GRM188R71C224K
TDK C1608X7R1C224K
DESIGNATION QTY
DESCRIPTION
0.01µF
±10%,
50V X7R ceramic
capacitors (0603)
Kemet C0603C103K5RAC
Murata GRM188R71H103K
TDK C1608X7R1H103K
1000pF
±10%,
50V ceramic
capacitors (0603)
Kemet C0603C102K5RAC
Murata GRM188R71H102K
TDK C1608X7R1H102K
12pF
±10%,
3kV HV ceramic
capacitors (1808)
Kemet C1808C120KHGAC
TDK C4520C0G3F120K
Not installed (0603)
100pF
±10%,
3kV HV ceramic
capacitors (1808)
Kemet C1808C101KHGAC
TDK C4520C0G3F101K
C8, C19
2
C2, C4, C6,
C7, C18
5
C9, C10
2
C3
1
C11, C12
2
C13
0
C5
1
C14–C17
4
________________________________________________________________
Maxim Integrated Products
1
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.
MAX8751 Evaluation Kit
Evaluates: MAX8751
Component List (continued)
DESIGNATION QTY
C20
1
DESCRIPTION
4.7µF
±10%,
25V X7R ceramic
capacitor (1206)
TDK C3216X7R1E475K
2.2µF
±10%,
25V X7R ceramic
capacitors (1206)
TDK C3216X7R1E225K
Shrouded headers for CCFL lamp
connection, 3.5mm pin spacing,
PC board mount
JST SM02B-BHSS-1-TB
Dual diode, common cathode,
1N4148-type, SOT23
Central Semiconductor CMPD2838
Fairchild Semiconductor MMBD4148CC
Diodes, 1N4148-type, SOD123
Central Semiconductor CMHD4448
Diodes Inc. 1N4148W
Fairchild Semiconductor MMSD4148
Vishay Semiconductors 1N4148W
Fuse, 3A, 32V (1206)
Littelfuse 0466003 NR
2 x 5 right-angle female receptacle
2 x 5 right-angle header
—
4
3
0
3-pin headers
2-pin headers
Not installed
2N7002 MOSFET, SOT23
Central Semiconductor 2N7002
Diodes Inc. 2N7002
Fairchild Semiconductor 2N7002
n-channel MOSFETs, 8-pin SO
Fairchild Semiconductor FDS9412
2N3906-type pnp transistor, SOT23
Central Semiconductor CMPT3906
Diodes Inc. MMBT3906
Vishay Semiconductors MMBT3906
10Ω
±5%
resistor (0603)
100kΩ
±1%
resistor (0603)
—
1
6
DESIGNATION QTY
R3
R4–R7
R8
R9, R12, R13, R14
R10
R11
R15
R16, R17, R34
R18, R19,
R26–R29
R20, R21
R22–R25,
R35–R38
R30–R33, R40
R39
T1, T2
T3, T4, T5
U1
1
0
1
4
1
1
1
3
6
2
8
5
1
2
3
1
DESCRIPTION
150kΩ
±1%
resistor (0603)
Not installed (0603)
15Ω
±5%
resistor (0603)
100kΩ
±5%
resistors (0603)
100kΩ potentiometer (multiturn),
3/8in square
1kΩ
±5%
resistor (0603)
20kΩ
±5%
resistor (0603)
1MΩ
±5%
resistors (0603)
10kΩ
±5%
resistors (0603)
470kΩ
±5%
resistors (0603)
510kΩ
±5%
resistors (1206)
3.0kΩ
±5%
resistors (0603)
27kΩ
±5%
resistor (0603)
CCFL transformers, 1980:18
Sumida 1348-T009 (CEPH249 style)
Current balancing transformers, 1:1
Sumida P05NZ-054
MAX8751ETJ
(32-pin thin QFN, 5mm x 5mm)
PC board MAX8751 evaluation kit
Shunts
C23, C24
2
CN1–CN4
4
D1
1
D2–D11
10
F1
J1
J2
JU1, JU3,
JU4, JU5
JU2, JU6, JU7
JU8–JU12
1
1
1
Quick Start
Recommended Equipment
Before you begin, you need the following equipment:
• A DC power supply capable of supplying a voltage
between +8V to +24V at 5A to power the MAX8751
board
• Four CCFL lamps with the following specifications:
a) Maximum RMS strike voltage
≤
1.6kV
b) RMS lamp current
≤
6mA
c) Input power
≤
4W
WARNING! High voltages are present on this evalu-
ation kit. Use caution when making connections and
applying power.
Do not turn on the power until all connections are
complete.
M1
1
N1–N4
4
Q1
1
R1
R2
1
1
2
______________________________________________________________________________________
MAX8751 Evaluation Kit
Procedure
1) Connect the lamps to connectors CN1–CN4.
2) Connect the +8V to +24V supply to the pads
labeled VIN and GND on the MAX8751 EV kit.
3) Turn on the power supply.
Slave Mode Operation
Place a shunt on JU2 to enable slave mode operation
when using a daisy-chain configuration. See the
Daisy-
Chain Configuration
section for more details. See Table
2 for jumper settings.
Evaluates: MAX8751
Detailed Description
Brightness
The brightness of the lamp is adjustable using poten-
tiometer R10.
Shutdown
A shunt installed on JU3 2-3 places the MAX8751 in
shutdown mode. See Table 2 for jumper settings.
Phase Shift (PS1 and PS2)
Jumpers JU4 and JU5 set the phase shift for daisy
chaining up to five MAX8751s. See Table 1 for the
phase shift settings.
Brightness Control Select Input
Jumper JU1 connects the brightness control select
input (the SEL pin) to either VCC or GND. Connecting
SEL to VCC (JU1 = 1-2) enables brightness control
using an external sync signal. Connecting SEL to GND
(JU1 = 2-3) enables analog control where the bright-
ness is adjusted with an analog voltage on the CNTL
pin. See Table 2 for jumper settings.
HSYNC
Main switching frequency sync input. The switching fre-
quency synchronizes to an external signal applied to
HSYNC. Refer to the MAX8751 IC data sheet for more
information. Place a shunt on JU6 to disable the
HSYNC feature. See Table 2 for jumper settings.
Table 1. Phase Shift
PIN SETTINGS
JU4 (PS1)
2-3 (GND)*
1-2 (VCC)
2-3 (GND)
1-2 (VCC)
JU5 (PS2)
2-3 (GND)*
2-3 (GND)
1-2 (VCC)
1-2 (VCC)
MASTER
0
0
0
0
SLAVE 1
180
120
90
72
PHASE SHIFT IN DEGREES
SLAVE 2
—
240
180
144
SLAVE 3
—
—
270
216
SLAVE 4
—
—
—
288
*Default
position.
Table 2. Jumper Selection
JUMPER
JU1
JU2
SHUNT
LOCATION
1-2
2-3*
Not installed*
Installed
1-2*
JU3
JU4
JU5
JU6
JU7
2-3
Not installed
—
—
Not installed
Installed*
Not installed
Installed*
FUNCTION
An external sync signal controls the brightness.
An analog voltage on the CNTL pin controls the brightness.
Configures the MAX8751 for master operation.
Configures the MAX8751 for slave operation.
Enables the MAX8751.
Disables the MAX8751.
Drive pad
SHDN
with an external logic signal.
Phase-shift select input 1 (PS1). See the phase shift table (Table 1).
Phase-shift select input 2 (PS2). See the phase shift table (Table 1).
The switching frequency synchronizes to an external signal applied to HSYNC.
Disables the HSYNC feature.
The DPWM frequency synchronizes to an external signal applied to LSYNC.
Disables the LSYNC feature.
*Default
position.
_______________________________________________________________________________________
3
MAX8751 Evaluation Kit
Evaluates: MAX8751
LSYNC
DPWM sync input. The DPWM frequency synchronizes
to an external signal applied to LSYNC. Refer to the
MAX8751 IC data sheet for more information. Place a
shunt on JU7 to disable the LSYNC feature. See Table
2 for jumper settings.
Daisy-Chain Configuration
Up to five MAX8751 EV kits can be daisy-chained
together. Connect J1 of slave 1 to J2 of the master. See
Tables 3 and 4 for daisy-chain connection and jumper
configuration.
Table 3. Daisy-Chain Connection
LOCATION IN
DAISY CHAIN
Master
Slave 1
Slave 2
Slave 3
Slave 4
CONNECTOR
J1
J2
J1
J2
J1
J2
J1
J2
J1
J2
CONNECTION
Not connected.
Connect to J1 of slave 1.
Connect to J2 of master.
Connect to J1 of slave 2.
Connect to J2 of slave 1.
Connect to J1 of slave 3.
Connect to J2 of slave 2.
Connect to J1 of slave 4.
Connect to J2 of slave 3.
Not connected.
Table 4. Master/Slave Jumper
Configuration
MASTER
JUMPER
JU1
JU2
JU3
JU4
JU5
JU6
JU7
SHUNT
LOCATION
User defined
Not installed
2-3
See Table 1
See Table 1
User defined
User defined
JUMPER
JU1
JU2
JU3
JU4
JU5
JU6
JU7
2-3
Installed
Not installed
Same setting as
master
Same setting as
master
Installed
Installed
SLAVE
SHUNT
LOCATION
4
_______________________________________________________________________________________
MAX8751 Evaluation Kit
Evaluates: MAX8751
VIN
VIN
8V TO 24V
GND
20
C2
0.1µF
VCC
VCC
VCC
VCC
VCC
R9
100kΩ
1
R10
100kΩ
3
R11
1kΩ
2
DPWM
TP2
LFCK
6
R17
1MΩ
TP3
HFCK
R16
1MΩ
TP4
PSCK
VCC
1
2
VCC
1
2
R2
100kΩ
1%
R3
150kΩ
1%
3
JU5
HF
13
HF
VFB
12
28
C4
0.1µF
TFLT
C5
0.22µF
HSYNC
AGND
JU6
10
HSYNC
2
LF
PCOMP
TFLT
ISEC 32
JU12
IFB
R34
1MΩ
SHDN
C8
0.01µF
C18
0.1µF
R8
15Ω
C13
OPEN
1
R15
20kΩ
D1
VFB
R14
100kΩ
3
R
L
1
31
PS2
GH2
3
JU4
18
14
PS1
LX2
19
C7
0.1µF
R7
SHORT
(PC TRACE)
8
PSCK
9
HFCK
U1
PGND2
15
R6
SHORT
(PC TRACE)
BST2
LFCK
LX1
22
TP1
C19
0.01µF
7
DPWM
C6
0.1µF
R5
SHORT
(PC TRACE)
7
8
4
2
6
5
N2
1
3
LX1
7
8
N4
1
3
5
6
4
2
LX2
SHDN
JU2
3
CNTL
GH1
23
BST
BST1
R4
SHORT
(PC TRACE)
C3
1µF
SHDN
1
3
2
JU3
4
27
21
IN
SEL
11
R1
10Ω
VCC
1
2
JU1
3
GND
V
CC
17
BST2
BST2
C1
22µF
F1
3A
SHDN
BST1
24
CNTL
7
8
4
2
6
5
N1
1
3
7
8
N3
1
3
2
5
6
4
GL1
PGND1
25
26
MAX8751
GL2
16
C11
12pF
3kV
HV1
2
R12
100kΩ
C9
1000pF
LF
R13
100kΩ
C10
1000pF
C12
12pF
3kV
HV2
ISEC
30
IFB
LSYNC
AGND
JU7
5
LSYNC
COMP
29
D2
Figure 1. MAX8751 EV Kit Schematic
_______________________________________________________________________________________
5
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