MAX4990EVKIT+ Datasheet MAX4990EVKIT+ | P1-P3

General Description

The MAX4990 evaluation kit (EV kit) provides a proven

design to evaluate the MAX4990 high-voltage, ±15kV

ESD-protected electroluminescent lamp driver. Alligator

clip leads contact a wide variety of standard electrolu-

minescent lamps.

The MAX4990 EV kit printed-circuit board (PCB) comes

with a MAX4990ETD+ installed.

Features

 Lead-Free and RoHS-Compliant

 Proven PCB Layout

 Fully Assembled and Tested

 Alligator Clips Contact Wide Range of EL Displays

 Single 5V Supply or Split Battery/Digital Supplies

 Fixed or Adjustable Output Slew Rate, Brightness,

Soft On/Soft Off

 Fixed or Adjustable f

and f

Evaluates: MAX4990

MAX4990 Evaluation Kit

________________________________________________________________

Maxim Integrated Products

19-2472; Rev 0; 12/07

Component List

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.

Ordering Information

PART TYPE

MAX4990EVKIT+ EV Kit

Denotes lead-free and RoHS-compliant.

DESIGNATION QTY DESCRIPTION

C1, C5 2

1µF ±20%, 25V X5R ceramic

capacitors (0603)

Murata GRM188R61E105K

C2 1

1000pF ±10%, 25V C0G ceramic

capacitor (0603)

Murata GRM1885C1E102J

C3 1

68pF ±5%, 50V C0G ceramic

capacitor (0603)

Murata GRM1885C1H680J

C4 1

0.1µF ±20%, 16V X7R ceramic

capacitor (0603)

Murata GRM188R71C104K

C6 1

3300pF ±20%, 250V X5R ceramic

capacitor (0805)

TDK C2012X7R2E332M

C7 1

15000pF ±20%, 50V X7R ceramic

capacitor (0603)

Murata GRM188R71H153K

C8 1

10µF ±20%, 25V X5R ceramic

capacitor (1206)

Murata GRM31CR61E106K

D1 1

S i l i con d i od e ( S OT23) ( Top M ar k: A82)

Central Semiconductor CMPD2003

LEAD FREE

JU1, JU3 2 3-pin headers

JU2, JU4–JU8 6 2-pin headers

L1 1

220µH inductor (3.8mm x 3.8mm)

TOKO D312C1001BS-221M

DESIGNATION QTY DESCRIPTION

R1 1 100kΩ ±5% resistor (0603)

R2, R4 2 374kΩ ±1% resistors (0603)

R3 1 1MΩ ±5% resistor (0603)

R5 1 13.3kΩ ±1% resistor (0603)

R6 1 40.2kΩ ±1% resistor (0603)

R7 1 324kΩ ±1% resistor (0603)

U1 1

High-voltage EL panel driver (14-pin,

3mm x 3mm TDFN)

Maxim MAX4990ETD+

(Top Mark: ADL)

U2 1

M axi m d ual C M OS ti m er

ICM7556ISD+ ( 14- p i n S O )

VA, VB 2

Alligator clip/banana connectors, red

boot

VC1 1

7pF to 50pF variable capacitor (4mm

x 4.5mm)

Murata TZB4R500BA10R00

VR1, VR2 2

2M Ω top - ad j ust, 12- tur n tr i m m er s ( 2m m )

Murata PV37W205C01B00

VR3 1

500kΩ top - adj ust, 12- tur n tr i m m er ( 2m m )

Murata PV37W504C01B00

— 8 Shunts

— 2 Wires (VA, VB)

— 1 PCB: MAX4990 Evaluation Kit+

Evaluates: MAX4990

MAX4990 Evaluation Kit

2 _______________________________________________________________________________________

Quick Start

Recommended Equipment

Before beginning, the following equipment is needed:

• MAX4990 EV kit

• A user-supplied electroluminescent (EL) lamp

• 5V DC power supply

• Oscilloscope to monitor VA and VB

Procedure

The MAX4990 EV kit is fully assembled and tested.

Follow the steps below to verify board operation:

1) Verify that all jumpers (JU1–JU8) are in their default

positions, as shown in Table 1.

2) Connect the VA and VB alligator clip leads to the EL

lamp. Note: Under some conditions, the VA/VB

output may be as high as 250V

P-P

3) Connect the oscilloscope to VA and VB. With math

function, monitor VA-VB waveform.

4) Connect the 5V DC power supply between the VDD

and GND pins.

5) Switch on the 5V power supply. Verify that the EL

lamp illuminates.

Table 1. MAX4990 EV Kit Jumper Descriptions (JU1–JU8)

Component Suppliers

SUPPLIER

PHONE

WEBSITE

Central Semiconductor Corp.

631-435-1110

www.centralsemi.com

Murata Mfg. Co., Ltd.

770-436-1300

www.murata.com

TDK Corp.

847-803-6100

www.component.tdk.com

TOKO America, Inc.

847-297-0070

www.tokoam.com

Note: Indicate that you are using the MAX4990 when contacting these component suppliers.

JUMPER SIGNAL SHUNT POSITION FUNCTION

1-2* Set by R2

JU1 SLEW

2-3 Adjustable by VR1

1-2* EN = logic-high: normal operation

JU2 EN

Open EN = logic-low: shutdown

1-2 Adjustable by VR2

JU3 DIM

2-3* Set by R4

1-2 Adjustable by VR3

JU4 EL

Open* Set by C2

1-2 Adjustable by VC1

JU5 SW

Open* Set by C3

1-2*

Power supplied to U2 by VDD

Note: VDD must be ≤ 5V

JU6 VDD2

Open U1 must be powered independently

1-2*

Power supplied to U1 by VDD

Note: VDD must be ≤ 5V

JU7 VDD1

Open U2 must be powered independently

1-2*

VDD and VBATT connected together

Note: VBATT must be ≤ 5V

JU8 VBATT

Open VBATT supplies L1 independent of VDD

Default position.

Detailed Description of Hardware

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 (R

SLEW

)

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.

Output Voltage (R

DIM

, R

SLEW

)

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.

subject to the constra V V V

DIM

SLEW

PP−−

=× ≤≤200 70 250, int

Slew Rate

SLEW

100

11 25

⎛

⎝

⎜

⎞

⎠

⎟

= Ω

()

Evaluates: MAX4990

MAX4990 Evaluation Kit

_______________________________________________________________________________________ 3

JU1 SHUNT

POSITION

VR1

TRIMMER

SLEW

(MΩ)

SLEW RATE

(V/100µs)

1-2 — R2 = 0.374 30

25% CW

VR1 + R1 =

0.560

2-3

50% CW

VR1 + R1 =

0.997

Table 2. Slew Rate Configuration

CW = Clockwise. Approximate trimmer values provided for ini-

tial guidance only.

JU1 SHUNT

POSITION

VR1 TRIMMER

SLEW

(MΩ)

JU3 SHUNT

POSITION

VR2 TRIMMER

DIM

(MΩ)

P-P

(V)

2-3 — R4 = 0.374 200

7% CW VR2 = 0.152 90

13% CW VR2 = 0.272 150

1-2 — R2 = 0.374

1-2

19% CW VR2 = 0.386 200

2-3 — R4 = 0.374 144

10% CW VR2 = 0.211 80

25% CW VR2 = 0.496 182

25% CW

VR1 + R1 =

0.560

1-2

36% CW VR2 = 0.729 242

2-3 — R4 = 0.374 86

19% CW VR2 = 0.383 86

35% CW VR2 = 0.700 150

2-3

50% CW

VR1 + R1 =

0.997

1-2

70% CW VR2 = 1.398 260

Table 3. Output Voltage Configuration

CW = Clockwise. Approximate trimmer values provided for initial guidance only.

P1-P3 P4-P6 P7-P8

MAX4990EVKIT+

Mfr. #:

Buy MAX4990EVKIT+

Manufacturer:

Maxim Integrated

Description:

Power Management IC Development Tools MAX4990 Eval Kit

Lifecycle:

New from this manufacturer.

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MAX4990EVKIT+