Rainbow-electronics MAX16820 Manual do Utilizador descarregar pdf (Página 4)

MAX16819/MAX16820

2MHz High-Brightness LED Drivers with

High-Side Current Sense and 5000:1 Dimming

4 _______________________________________________________________________________________

Typical Operating Characteristics

= V

DIM

= 12V, C

VCC

= 1µF, R

SENSE

= 0.5Ω connected between IN and CSN. Typical values at T

= +25°C, unless otherwise

noted.)

EFFICIENCY vs. V

MAX16819 toc01

(V)

EFFICIENCY (%)

252010 15

100

530

LED 5

LED 4

L = 47

DRV SWITCHING FREQUENCY

vs. V

MAX16819 toc02

(V)

DRV SWITCHING FREQUENCY (kHz)

242016128

100

200

300

400

600

500

700

800

900

1000

1100

1200

1300

1400

1500

428

L = 47

LED 5

LED 4

LED 3

LED 1

LED 2

LED CURRENT VARIATION vs. V

MAX16819 toc03

(V)

LED CURRENT VARIATION FROM SET CURRENT (%)

252010 15

-1.5

-1.0

-0.5

1.0

0.5

1.5

2.0

-2.0

530

LED 5

LED 4

LED 3

LED 2

LED 1

LED(NOMINAL)

= 400mA

L = 47

vs. V

MAX16819 toc04

(V)

25.022.517.5 20.0

10.0

12.5 15.07.5

4.6

4.7

4.8

4.9

5.0

5.1

5.2

5.3

5.4

5.5

4.5

5.0 27.5

LED

= 0

vs. TEMPERATURE

MAX16819 toc05

TEMPERATURE (

(V)

1109565 80-10 5 20 35 50-25

5.31

5.32

5.33

5.34

5.35

5.36

5.37

5.38

5.39

5.40

5.30

-40 125

= 24V

= 12V

DIM

= 0V

SUPPLY CURRENT vs. V

MAX16819 toc06

(V)

SUPPLY CURRENT (µA)

24.5

12.5

20.516.58.5

100

150

200

250

300

4.5 28.5

DIM

= 0V

PWM DIMMING AT 200Hz

(10% DUTY CYCLE)

MAX16819 toc07

1ms/div

DIM

2V/div

LED

200mA/div

= 12V, L = 47µH,

1 LED MAX16819

PWM DIMMING AT 200Hz

(90% DUTY CYCLE)

MAX16819 toc08

1ms/div

DIM

2V/div

LED

200mA/div

= 12V, L = 47µH,

1 LED MAX16819

1 2 3 4 5 6 7 8 9 10

MAX16819/MAX16820 1

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