Rainbow-electronics MAX5971А Uživatelský manuál stáhnout pdf (Strana 10)

10 _____________________________________________________________________________________

MAX5971A

Single-Port, 40W, IEEE 802.3af/802.3at PSE

Controller with Integrated MOSFET

Typical Operating Characteristics (continued)

= +25°C, unless otherwise noted.)

LED PWM TIMING AND DUTY CYCLE

MAX5971A toc24

10µs/div

0mA

AGND

- V

OUT

50V/div

AGND

- V

LED

20V/div

OUT

500mA/div

LED OVERCURRENT FAULT WITH PWM DISABLED

MAX5971A toc23b

200ms/div

0mA

AGND

- V

OUT

50V/div

AGND

- V

LED

20V/div

OUT

500mA/div

LED OVERCURRENT FAULT WITH PWM ENABLED

MAX5971A toc23a

200ms/div

0mA

AGND

- V

OUT

50V/div

AGND

- V

LED

20V/div

OUT

500mA/div

LED DETECTION FAULT WITH PWM DISABLED

MAX5971A toc22b

200ms/div

0mA

AGND

- V

OUT

10V/div

AGND

- V

LED

20V/div

OUT

500mA/div

LED DETECTION FAULT WITH PWM ENABLED

MAX5971A toc22a

200ms/div

0mA

AGND

- V

OUT

10V/div

AGND

- V

LED

20V/div

OUT

500mA/div

STARTUP USING 2-EVENT CLASSIFICATION

WITH A VALID PD

MAX5971A toc21

100ms/div

0mA

AGND

- V

OUT

20V/div

OUT

100mA/div

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 20 21

MAX5971A 1

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