Myalarm V-LED1 Instrukcja Użytkownika Pobierz pdf (Strona 11)

Jul31-07 RevT SP7611A/7612A/7614A Low Dropout Linear LED driver  2007 Sipex Corporation

Page 11

LED Brightness Control

The SP761X LED Drivers feature analog and

PWM controls to give designers flexible

brightness control. To determine the value of

SET

, use the "I

SET

vs. V

CRTL

" graph under

the Typical Performance Characteristics.

1. SP761X/A

- Analog using V

CONTROL

Set V

CONTROL

and R

SET

for LED current

SETTING THE LED CURRENT – page 8

- PWM - Vcontrol

-Amplitude of PWM signal sets maximum LED

current

-Pulse width controls current between 0 and

maximum LED Set current

- PWM using Enable

- Set V

CONTROL

and R

SET

for LED current

SETTING THE LED CURRENT – page 6

ENABLE = PWM

-Amplitude has no effect on current

-Pulse width controls current between 0 and

maximum LED set current

APPLICATION INFORMATION

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Myalarm V-LED1 Instrukcja Użytkownika Strona 11