_______________________________________________________________________________________ 5
MAX5971A
Single-Port, 40W, IEEE 802.3af/802.3at PSE
Controller with Integrated MOSFET
Note 2: All devices are production tested at T
A
= +25NC. Limits at T
A
= -40NC and +85NC are guaranteed by design.
Note 3: If ILIM1 and ILIM2 are both unconnected, Class 5 detection is disabled. See the Class 5 PD Classification section and Table 3 for
details and settings.
Note 4: R
DOK
= (V
OUT2
- V
OUT1
)/(I
DET2
- I
DET1
). V
OUT1
, V
OUT2
, I
DET2
, and I
DET1
represent the voltage at OUT and the current at
DET during phase 1 and 2 of the detection, respectively.
Note 5: If Class 5 is enabled, this is the classification current thresholds from Class 4 to Class 5.
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
DIGITAL INPUTS/OUTPUTS (Voltages referenced to V
EE
)
Digital Input Low V
IL
0.8 V
Digital Input High V
IH
2.4 V
Internal Input Pullup Current I
PU
Pullup current to internal digital supply to
set default values
3 5 7
FA
LED Output Low Voltage V
LED_LOW
I
LED
= 10mA, PWM disabled, port power-on 0.8 V
LED Output Leakage I
LED_LEAK
PWM disabled, shutdown mode,
V
LED
= 60V
10
FA
PWM Frequency 25 kHz
PWM Duty Cycle 6.25 %
TIMING
Startup Time t
START
Time during which a current limit set to
420mA is allowed, starts when power is
turned on
50 60 70 ms
Fault Time t
FAULT
Maximum allowed time for an overcurrent
condition set by I
CUT
after startup
50 60 70 ms
Detection Reset Time t
ME
Time allowed for the port voltage to reset
before detection starts
80 90 ms
Detection Time t
DET
Maximum time allowed before detection is
completed
330 ms
Midspan Mode Detection Delay t
DMID
2 2.2 2.4 s
Classification Time t
CLASS
Time allowed for classification 19 23 ms
Mark Event Time Time allowed for mark event 7 9 11 ms
V
EEUVLO
Turn-On Delay t
DLY
Time V
AGND
must be above the V
EEUVLO
thresholds before the device operates
5.2 ms
Restart Timer t
RESTART
Time the device waits before turning on
after an overcurrent fault
16 x
t
FAULT
ms
(26 Seiten)
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