NCP1090, NCP1091, NCP1092

http://onsemi.com

10

NCP1092

Data

Pairs

Spare

Pairs

Rclass

Rinrush

RJ−45

DB1

DB2

RTN

VPORTN

CLASS

INRUSH

AUX

VPORTP

DET

To DC−DC

Converter

PGOOD

Rdet

VAUX (+)

VAUX (−)

D1

Figure 10. PoE Supply Dominant PD Interface

Thermal Shutdown

The NCP1090/91/92 include a thermal shutdown which

protect the device in case of high junction temperature. Once

the thermal shutdown (TSD) threshold is exceeded, the

classification block, the pass switch and the PGOOD

indicator are disabled. The NCP109X returns automatically

to normal operation once the die temperature has fallen

below the TSD low limit.

Company or Product Inquiries

For more information about ON Semiconductor’s Power

over Ethernet products visit our Web site at

http://www.onsemi.com.