EV3378-S-00A – 4-CHANNEL WLED CONTROLLER PLUS BUCK CONVERTER

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.

EV3378-S-00A Rev. 1.0

www.MonolithicPower.com

8

2/2/2015

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

© 2015 MPS. All Rights Reserved.

QUICK START GUIDE

1. For Boost LED Controller, connect the positive and negative terminals of the load panel (10

white LEDs in series, 4 stings) to the LED and LED1~4 pins on the EV board, respectively.

For Buck Converter, connect the load between Vout to GND.

2. Connect the positive and negative terminals of the power supply (8V ~ 24V) to the VIN and

GND pins on the EV board, respectively. Then the Buck Converter will work.

3. Pull both PWM and A-DIM pin to high level (1.5-5V).

4. Pull EN/BL pin high (1.5-5V) to enable the Boost LED Controller.

5. For PWM dimming, apply a PWM rectangular waveform with a minimum voltage less than 0.4V

and a maximum greater than 1.5V on PWM pin. The LED current is chopped by PWM signal.

The frequency of the PWM signal is recommended between 200Hz to 2kHz.

6. For analog dimming, apply a DC waveform with a voltage between 0.4 and 1.5V on A-DIM pin;

or a PWM rectangular waveform with a minimum voltage less than 0.4V and a maximum greater

than 1.5V on A-DIM pin, the frequency of the PWM signal is recommended >=20kHz. The

amplitude of LED current linearly follows the voltage of A-DIM or the duty of the PWM signal.