EV1529DR-00A – FIXED FREQUENCY CONVERTER LCD BACKLIGHT EV BOARD

NOTICE:

The information in this document is subject to change without notice. Please contact MPS for current specifications.

Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating MPS

products into any application. MPS will not assume any legal responsibility for any said applications.

EV1529DR-00A Rev. 1.0

www.MonolithicPower.com

4

11/2/2005

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2005 MPS. All Rights Reserved.

TM

QUICK START GUIDE

The LED currents at backlight mode, backlight plus review mode and flash mode are set to 20mA, 40mA, and

100mA, respectively on this board. The board layout accommodates mostly common used inductors and

output capacitors.

1. Preset Power Supply to 2.7V

2. Turn Power Supply off.

3. Connect Power Supply terminals to:

a. Positive (+): VIN

b. Negative (–): GND

4. Solder the first backlight LED string to LED1 - LED4.

Solder the second backlight LED string to LED5 – LED8.

Solder the flash LED string to LED9 – LED12.

Set EN1 and EN2 based on the Enable Operation Table below. Connect EN1, EN2 to VIN to set

them “H” and to GND to set them “L”.

Mode

EN1

EN2

Strings 1+2: LCD

Backlight LEDs

String 3: Flash

LEDs

Off

L

L

Off

Off

Backlight

H (PWM)

L

On (PWM)

Off

Backlight plus Preview

H (PWM)

H

On (PWM)

Preview current

Flash

L

H

Off

Flash current

5. Turn Power Supply on after making connections.

BL

_

LED

SET

I

V

950

1

RS

×

=

PV

_

LED

SET

I

V

1100

2

RS

×

=

FL

_

LED

SET

I

V

1000

3

RS

×

=

Ω

=

×

=

k

52

.

115

10

216

.

1

950

1

RS

(Use a 115kΩ 1% resistor)

Ω

=

×

=

k

88

.

66

20

216

.

1

1100

2

RS

(Use a 66.5kΩ 1% resistor)

Ω

=

×

=

k

11

.

8

150

216

.

1

1000

3

RS

(Use a 8.06kΩ 1% resistor)