4 ______________________________________________________________________________________
MAX5971B
Single-Port, 40W, IEEE 802.3af/at,
PSE Controller with I
2
C
ELECTRICAL CHARACTERISTICS (continued)
(V
AGND
- V
EE
= 32V to 60V, T
A
= -40NC to +85NC, all voltages are referenced to V
EE
, unless otherwise noted. Typical values are at
V
AGND
- V
EE
= +54V, T
A
= +25NC. Currents are positive when entering the pin and negative otherwise.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
LOAD DISCONNECT
DC Load-Disconnect Threshold I
DCTH
Minimum load current allowed before
disconnect (DC disconnect active),
V
OUT
= 0V
5 7.5 10 mA
AC Load-Disconnect Threshold
(Note 4)
I
ACTH
Current into DET, for I
DET
< I
ACTH
the port
powers off (AC disconnect active)
115 130 145
FA
Triangular Wave Peak-to-Peak
Voltage Amplitude
AMP
TRW
Measured at DET, referred to AGND 3.85 4 4.2 V
OSC Pullup/Pulldown Currents I
OSC
Measured at OSC 26 32 39
FA
ACD_EN Threshold V
ACD_EN
V
OSC
- V
EE
> V
ACD_EN
to activate AC
disconnect
270 330 380 mV
Load-Disconnect Timer t
DISC
Time from I
RSENSE
< I
DCTH
(DC
disconnect active) or I
DET
< I
ACTH
(AC
disconnect active) to gate shutdown
(Note 5)
300 400 ms
DETECTION
Detection Probe Voltage
(First Phase)
V
DPH1
V
AGND
- V
DET
during the first detection
phase
3.8 4 4.2 V
Detection Probe Voltage
(Second Phase)
V
DPH2
V
AGND
- V
DET
during the second detection
phase
9 9.3 9.6 V
Current-Limit Protection I
DLIM
V
DET
= V
AGND
during detection, measure
current through DET
1.50 1.75 2.00 mA
Short-Circuit Threshold V
DCP
If V
AGND
- V
OUT
< V
DCP
after the first
detection phase a short circuit to AGND is
detected.
1 V
Open-Circuit Threshold I
D_OPEN
First point measurement current threshold
for open condition
20
FA
Resistor Detection Window R
DOK
(Note 6) 19 26.5
kI
Resistor Rejection Window R
DBAD
Detection rejects lower values 15.5
kI
Detection rejects higher values 32
CLASSIFICATION
Classification Probe Voltage V
CL
V
AGND
- V
DET
during classification 16 20 V
Current-Limit Protection I
ClLIM
V
DET
= V
AGND
, during classification
measure current through DET
65 80 mA
(15 Seiten)
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