MAX4990EVKIT+ Maxim Integrated Products, MAX4990EVKIT+ Datasheet - Page 3

• Manufacturer Part Number: MAX4990EVKIT+
• Description: KIT EVAL FOR MAX4990
• Manufacturer: Maxim Integrated Products

Specifications of MAX4990EVKIT+

• Main Purpose: Lighting, Electroluminescent
• Utilized Ic / Part: MAX4990
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Secondary Attributes: -
• Embedded: -
• Primary Attributes: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

The MAX4990 EV kit provides a proven layout for the
MAX4990. Component selection, adjustment range,
and typical operation values for a typical EL panel
(1.5in x 2.5in area, nominal 15nF load capacitance) are
described in the sections that follow.
Slew rate is set by the resistance on the SLEW pin (see
Table 2). Many other adjustments depend upon the
slew rate setting as a reference. The equation is:
The VR1 + R1 resistance can be adjusted to a specific
value before applying power, by connecting an ohm-
meter between JU1 pin 3 and GND. After adjusting VR1
to the desired value, disconnect the ohmmeter, install
the JU1 shunt, and finally, apply power to the EV kit.
Table 3. Output Voltage Configuration
CW = Clockwise. Approximate trimmer values provided for initial guidance only.
Detailed Description of Hardware
JU1 SHUNT
POSITION
1-2
2-3
Slew Rate
VR1 TRIMMER
_______________________________________________________________________________________
⎛
⎜
⎝
25% CW
50% CW
100
—
V
µ
s
⎞
⎟ =
⎠
Slew Rate (R
R
11 25
SLEW
.
VR1 + R1 =
VR1 + R1 =
R2 = 0.374
R
0.560
0.997
(MΩ)
(
SLEW
M
Ω
)
SLEW
JU3 SHUNT
POSITION
)
2-3
1-2
2-3
1-2
2-3
1-2
MAX4990 Evaluation Kit
The output voltage control interacts with the slew rate
control (see Table 3). Peak-to-peak output voltage is set
by the ratio of the resistances on the DIM and SLEW pins:
The VR2 resistance can be adjusted to a specific value
before applying power, by connecting an ohmmeter
between JU3 pin 1 and GND. After adjusting VR2 to the
desired value, disconnect the ohmmeter, install the JU3
shunt, and finally, apply power to the EV kit.
Table 2. Slew Rate Configuration
CW = Clockwise. Approximate trimmer values provided for ini-
tial guidance only.
V
JU1 SHUNT
P P
POSITION
−
1-2
2-3
=
200
VR2 TRIMMER
×
13% CW
19% CW
10% CW
25% CW
36% CW
19% CW
35% CW
70% CW
7% CW
R
R
SLEW
—
—
—
DIM
TRIMMER
25% CW
50% CW
VR1
Output Voltage (R
,
—
subject to the constra
VR2 = 0.152
VR2 = 0.272
VR2 = 0.386
VR2 = 0.211
VR2 = 0.496
VR2 = 0.729
VR2 = 0.383
VR2 = 0.700
VR2 = 1.398
R4 = 0.374
R4 = 0.374
R4 = 0.374
VR1 + R1 =
VR1 + R1 =
R2 = 0.374
R
(MΩ)
R
DIM
0.560
0.997
(MΩ)
SLEW
int
70
DIM
V V
≤
SLEW RATE
V
(V/100µs)
, R
P P
P-P
−
200
150
200
144
182
242
150
260
90
80
86
86
30
20
12
SLEW
≤
(V)
250
V
3
)