4-Port PoE Manager

Microsemi Proprietary and Confidential. PD69104B1/F Datasheet Revision 2.0

15

The following table lists the three states analog input pins (current set, comm_mode) for the PD69104B1

/F device.

Table 12 • Three States Analog Input Pins (Current Set, Comm_Mode)

Symbol

Parameter

Test Conditions/Comment

Min

Typ

Max

Units

High-level input voltage

80%

VAUX3P3

VDC

Open

Not connected

40%

VAUX3P3

60%

VAUX3P3

VDC

Low-level input voltage

20%

VAUX3P3

VDC

4.1.1

Typical Power Dissipation Information

The following table lists the typical power dissipation information for the PD69104B1/F device.

Table 13 • Typical Power Dissipation Information

Typical Power Dissipation Information

R

Power Dissipation: 0.36 Ω × I

sense

port2

R

Power Dissipation: 0.3 Ω × I

ds_ON

port2

P

= 15.4 W ==> Port Power Dissipation at R

= 37 mW (320 mA)

port_AF

sense

Port Power Dissipation at R

= 31 mW (320 mA)

ds_ON

P

= 30 W ==> Port Power Dissipation at R

= 130 mW (600 mA)

port_AT

sense

Port Power Dissipation at R

= 108 mW (600 mA)

ds_ON

Using Internal 3.3 V regulator

Typical PD69104B1/F self power dissipation (including internal regulations) = 0.5 W (50 V)

Typical PD69104B1/F at 4 × Port AF application power dissipation = 0.5 W + 4 x 31 mW + 4 × 37 mW = 0.77 W

Typical PD69104B1/F at 4 × Port AT application power dissipation = 0.5 W + 4 x 108 mW + 4 × 130 mW = 1.45 W

Using External 3.3 V regulator

Typical PD69104B1/F self power dissipation (external 3.3 V source) = 0.25 W (50 V)

Typical PD69104B1/F at 4 × Port AF application power dissipation = 0.25 W + 4 x 31 mW + 4 × 37 mW = 0.52 W

Typical PD69104B1/F at 4 × Port AT application power dissipation = 0.25 W + 4 x 108 mW + 4 × 130 mW = 1.2 W

4.2

Dynamic Characteristics

PD69104B1/F utilizes three current level thresholds (I , I , I ) and three timers (T , T , T ).

min

cut

lim

min

cut

lim

Loads that consume I current for more than T are labeled as 'short circuit state' and are

lim

lim

shutdown.

Loads that dissipate more than I

for longer than T

are labeled as ‘overloads’ and are shutdown.

cut

cut

If output power is below I

for more than T , the PD is labeled as ‘no-load’ and is shutdown.

min

min

Automatic recovery from overload and no-load conditions is attempted every T

period (typically 1

OVLREC

second). Output power is limited to I , which is the maximum peak current allowed at the port.

lim

The following table lists the operational mode parameters.