EV3308DL-00A – 1.3A FIXED FREQUENCY WHITE LED DRIVER EVALUATION BOARD

NOTICE:

The information in this document is subject to change without notice. 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.

EV3308DL-00A Rev. 1.0

www.MonolithicPower.com

4

3/20/2012

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

© 2012 MPS. All Rights Reserved.

QUICK START GUIDE

1. Connect the positive and negative terminals of the load panel (3 white LEDs in series, 9 stings

paralleled) to the LED+ and LED- pins on the EV board, respectively.

2. Connect the positive and negative terminals of the power supply to the VIN and GND pins on

the EV board, respectively. Turn the power supply on.

3. If the power supply is less than 3.5V, additional bias circuit (R12, D2) is used. Put a 900Ω

resistor on R12 and 5V Zener diode on D2.

5. Provide two PWM dimming signal on PWMIA and PWMIB pin respectively. Dual PWM dimming

can adjust LED brightness. A capacitor on the FSET pin sets the PWM dimming frequency with

a duty cycle of:

PWMIA

PWMIB

DD



pin.