MP3378

– 4-CHANNEL WLED CONTROLLER PLUS BUCK CONVERTER

MP3378 Rev. 1.01

www.MonolithicPower.com

19

5/26/2017

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Table 1

—The range of PWM dimming duty

100 < f

 200

0.30%

100%

200 < f

 500

0.75%

100%

500 < f

 1 k

1.50%

100%

1 k < f

 2 k

3.00%

100%

2 k < f

 5 k

7.50%

100%

5 k < f

 10 k

15.00%

100%

10 k < f

 20 k

30.00%

100%

2. Analog Dimming

For analog dimming, apply a PWM signal or a

DC voltage signal to ADIM. An internal RC filter

(10 M

Ω resistor and 100 pF capacitor) is

integrated into ADMIN. If a PWM signal is applied

to ADMIN, a >20 kHz frequency is recommended

to

achieve

improved

PWM

signal

filtering

performance and ensure the amplitude voltage is

higher than 1.5 V, and the low-level voltage is

less than 0.4 V. For DC signal input, please apply

a DC input signal range from 0.41 V to 1.49 V to

set linearly the LED current from minimum to full

scale.