Rainbow-electronics MAX5940B Bedienungsanleitung PDF herunterladen (Seite 4)

MAX5940A/MAX5940B

IEEE 802.3af PD Interface Controller

For Power-Over-Ethernet

4 _______________________________________________________________________________________

INi + 1

INi

OFFSET

1VV

INi

INi + 1

OFFSET

≅ I

INi

≅

INi + 1

- V

INi

)

INi + 1

- I

INi

)

INi + 1

- I

INi

)

Figure1 . Effective Differential Input Resistance/Offset Current

DETECTION CURRENT vs. INPUT VOLTAGE

MAX5940A/B toc01

INPUT VOLTAGE (V)

DETECTION CURRENT (mA)

8642

0.1

0.2

0.3

0.4

0.5

010

DISC

= 25.5kΩ

+ I

RDISC

CLASSIFICATION CURRENT vs. INPUT VOLTAGE

MAX5940A/B toc02

INPUT VOLTAGE (V)

CLASSIFICATION CURRENT (mA)

252015105

030

CLASS 0

CLASS 1

CLASS 2

CLASS 3

CLASS 4

EFFECTIVE DIFFERENTIAL INPUT

RESISTANCE vs. INPUT VOLTAGE

MAX5940A/B toc03

INPUT VOLTAGE (V)

EFFECTIVE DIFFERENTIAL INPUT RESISTANCE (MΩ)

108642

0.5

1.0

1.5

2.0

2.5

3.0

3.5

012

INPUT OFFSET CURRENT

vs. INPUT VOLTAGE

MAX5940A/B toc04

INPUT VOLTAGE (V)

INPUT OFFSET CURRENT (µA)

9753

-3.0

-2.5

-2.0

-1.5

-1.0

-0.5

-3.5

111

NORMALIZED UVLO

vs. TEMPERATURE

MAX5940A/B toc05

TEMPERATURE (°C)

NORMALIZED UVLO

603510-15

0.992

0.994

0.996

0.998

1.000

1.002

1.004

1.006

1.008

1.010

0.990

-40 85

UVLO = V

PGOOD OUTPUT LOW VOLTAGE

vs. CURRENT

MAX5940A/B toc06

SINK

(mA)

PGOOD

(mV)

15105

100

150

200

250

020

Typical Operating Characteristics

= (GND - V

) = 48V, GATE = PGOOD = PGOOD = OUT = OPEN, UVLO = V

(MAX5940B), T

= -40°C to +85°C. Typical values

are at T

= +25°C. All voltages are referenced to V

, unless otherwise noted.)

1 2 3 4 5 6 7 8 9 ... 14 15

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