MAX5965A/MAX5965B
High-Power, Quad, Monolithic, PSE Controllers
for Power over Ethernet
_______________________________________________________________________________________ 5
ELECTRICAL CHARACTERISTICS (continued)
(V
AGND
= 32V to 60V, V
EE
= 0V, V
DD
to V
DGND
= +3.3V, all voltages are referenced to V
EE
, unless otherwise noted. Typical values are at
V
AGND
= +48V, V
DGND
= +48V, V
DD
= (V
DGND
+ 3.3V), T
A
= +25°C. Currents are positive when entering the pin and negative other-
wise.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
LOAD DISCONNECT
DC Load Disconnect
Threshold
V
DCTH
Minimum V
SENSE
allowed before disconnect
(DC disconnect active), V
OUT_
= 0V
2.5 3.75 5.0 mV
AC Load Disconnect
Threshold
I
ACTH
Current into DET_, for I < I
ACTH
the port
powers off, ACD_EN_ bit = H; V
OSC_IN
=
2.2V, MAX5965B (Note 6)
285 320 360 µA
Oscillator Buffer Gain A
OSC
V
DET_
/V
OSC
, ACD_EN_ bit = H, MAX5965B 2.9 3.0 3.1 V/V
OSC Fail Threshold V
OSC_FAIL
Port does not power on if V
OSC
< V
OSC_FAIL
and ACD_EN_ bit is high, MAX5965B (Note 7)
1.8 2.2 V
OSC Input Impedance Z
OSC
OSC input impedance when all the ACD_EN_
are active, MAX5965B
100 kΩ
Load Disconnect Timer t
DISC
Time from V
SENSE
< V
DCTH
to gate shutdown
(Note 8)
300 400 ms
DETECTION
Detection Probe Voltage
(First Phase)
V
DPH1
AGND - V
DET_
during the first detection
phase
3.8 4 4.2 V
Detection Probe Voltage
(Second Phase)
V
DPH2
AGND - V
DET_
during the second detection
phase
9.0 9.3 9.6 V
Current-Limit Protection I
DLIM
V
DET_
= AGND, during detection, measure
current through DET_
1.5 1.8 2.2 mA
Short-Circuit Threshold V
DCP
If AGND - V
OUT
< V
DCP
after the first
detection phase a short circuit to AGND is
detected
1V
Open-Circuit Threshold I
D_OPEN
First point measurement current threshold for
open condition
12.5 µA
Resistor Detection Window R
DOK
(Note 9) 19.0 26.5 kΩ
Detection rejects lower values 15.2
Resistor Rejection Window R
DBAD
Detection rejects higher values 32
kΩ
CLASSIFICATION
Classification Probe Voltage V
CL
V
AGND
- V
DET_
during classification 16 20 V
Current-Limit Protection I
CILIM
DET_ = AGND, during classification 68 80 mA
Class 0, Class 1 5.5 6.5 7.5
Class 1, Class 2 13 14.5 16
Class 2, Class 3 21 23 25
Class 3, Class 4 31 33 35
Classification Current
Thresholds
I
CL
Classification current
thresholds between
classes
Class 4, Class 5 45 48 51
mA
(20 stránky)
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