Rainbow-electronics MAX5969B Manual do Utilizador descarregar pdf (Página 12)

IEEE 802.3af/at-Compliant, Powered Device Interface

Controllers with Integrated Power MOSFET

MAX5969A/MAX5969B

12 _____________________________________________________________________________________

Applications Information

Operation with 12V Adapter

Layout Procedure

Careful PCB layout is critical to achieve high efficiency

and low EMI. Follow these layout guidelines for optimum

performance:

1) Place the input capacitor, classification resistor, and

transient voltage suppressor as close as possible to

the MAX5969A/MAX5969B.

2) Use large SMT component pads for power dissipat-

ing devices such as the MAX5969A/MAX5969B and

the external diodes.

3) Use short and wide traces for high-power paths.

4) Use the MAX5969 Evaluation Kit layout as a refer-

ence.

Figure 2. Typical Configuration When Using a 12V Wall Power Adapter

68nF

2-EVENT

CLASSIFICATION

(ASSERTED ON)

ENABLE

DC-DC

CONVERTER

IN+

IN-

RJ-45

AND

BRIDGE

RECTIFIER

GND

-54V

SMAJ58A

MAX5969A

MAX5969B

DET

24.9kI

CLS

RTN

WAD

DET

CLS

2EC

12V

BATTERY

THIS CIRCUIT ACHIEVES

PROPER 2EC LOGIC WHEN

BATTERY IS < 12.5V

1 2 ... 7 8 9 10 11 12 13 14

MAX5969A/MAX5969B 1

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