Rainbow-electronics MAX16820 Bedienungsanleitung PDF herunterladen (Seite 5)

MAX16819/MAX16820

PWM DIMMING AT 20kHz

(10% DUTY CYCLE)

MAX16819 toc12

10µs/div

DIM

2V/div

LED

200mA/div

= 24V, L = 47µH,

4 LEDS MAX16820

PWM DIMMING AT 20kHz

(90% DUTY CYCLE)

MAX16819 toc13

10µs/div

DIM

2V/div

LED

200mA/div

= 24V, L = 33µH,

4 LEDS MAX16820

2MHz High-Brightness LED Drivers with

High-Side Current Sense and 5000:1 Dimming

_______________________________________________________________________________________

PWM DIMMING AT 200Hz

(1% DUTY CYCLE)

MAX16819 toc09

10µs/div

DIM

2V/div

LED

200mA/div

= 12V, L = 47µH,

1 LED MAX16819

PWM DIMMING EXPANDED

(50% DUTY CYCLE)

MAX16819 toc10

1µs/div

DIM

2V/div

LED

200mA/div

= 24V, L = 33µH,

4 LEDS MAX16820

PWM DIMMING EXPANDED

(50% DUTY CYCLE)

MAX16819 toc11

4µs/div

DIM

2V/div

LED

200mA/div

= 12V, L = 47µH,

1 LED MAX16819

LED

VARIATION vs. TEMPERATURE

MAX16819 toc14

TEMPERATURE (°C)

LED CURRENT VARIATION FROM SET CURRENT (%)

11095-25 -10 5 35 50 6520 80

-1.5

-1.0

-0.5

0.5

1.0

1.5

2.0

-2.0

-40 125

= 24V

= 12V

DIM

= 0V

LED(NOMINAL)

= 400mA

L = 47µH

Typical Operating Characteristics (continued)

= V

DIM

= 12V, C

VCC

= 1µF, R

SENSE

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

= +25°C, unless otherwise

noted.)

1 2 3 4 5 6 7 8 9 10

MAX16819/MAX16820 1

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