Myalarm V-LED1 Instrukcja Użytkownika Pobierz pdf (Strona 3)

MAX1916

Low-Dropout, Constant-Current

Triple White LED Bias Supply

_______________________________________________________________________________________ 3

LED CURRENT vs.

V+ BIAS VOLTAGE

MAX1916 toc01

V+ BIAS VOLTAGE (V)

LED CURRENT (mA)

24356

LED3

LED2

LED1

UNMATCHED LEDS

2.0 2.5 4.0 4.53.0 3.5 5.0 5.5 6.0

OUTPUT CURRENT

vs. V

SUPPLY VOLTAGE

MAX1916 toc02

SUPPLY VOLTAGE (V)

OUTPUT CURRENT (mA)

19.5

19.6

19.8

19.7

19.9

20.0

-40 10-15 35 60 85

LED CURRENT vs.

TEMPERATURE

MAX1916 toc03

TEMPERATURE (°C)

LED CURRENT (mA)

100

10 100

LED CURRENT

vs. R

SET

MAX1916 toc04

SET

(kΩ)

LED CURRENT (mA)

CTRL

= 5.0V

CTRL

= 3.3V

CTRL

= 2.5V

CTRL

= 1.8V

1.5 2.52.0 3.0 3.5 4.0 4.5 5.0 5.5

LED CURRENT (I

LED

)

vs. V

CTRL

MAX1916 toc05

CTRL

(V)

LED CURRENT (mA)

A: R

SET

= 10kΩ

B: R

SET

= 15kΩ

C: R

SET

= 22kΩ

D: R

SET

= 33kΩ

E: R

SET

= 47kΩ

F: R

SET

= 68kΩ

G: R

SET

= 100kΩ

100

150

200

250

300

0105 152025303540

LED DROPOUT VOLTAGE

vs. CURRENT

MAX1916 toc06

LED CURRENT (mA)

LED DROPOUT VOLTAGE (mV)

Typical Operating Characteristics

= 3.3V, V

CTRL

= 3.3V, R

SET

= 24.9kΩ, V+ = 5V, T

= +25°C, unless otherwise noted.) (Circuit of Figure 1)

1 2 3 4 5 6 7

Triple White LED Bias Supply 1

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