Rainbow Electronics MAX5971А - Manual (Page 3)

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MAX5971A
Single-Port, 40W, IEEE 802.3af/802.3at PSE
Controller with Integrated MOSFET
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
OVERCURRENT
Overcurrent Threshold I CUT
Overcurrent
threshold
allowed for
t P t
FAULT ,
V
OUT
= 0V
(Note 3)
Class 0, 1, 2, 3 351 370 389
mA
Class 4 602 634 666
Class 5 if ILIM1 = V EE ,
ILIM2 = unconnected
710 748 785
Class 5 if ILIM1 =
unconnected, ILIM2 = V
EE
752 792 832
Class 5 if ILIM1 = V EE ,
ILIM2 = V EE
794 836 878
INTERNAL POWER
DMOS On-Resistance R DS(ON)
Measured
from OUT to
V
EE , I OUT =
100mA
T A = +25NC 0.5 0.9
I
T A = +85NC 0.6 1.3
Power-Off OUT Leakage Current I OUT_LEAK V EN = V EE , V OUT = V AGND 10 F A
SUPPLY MONITORS
V
EE Undervoltage Lockout V EE_UVLO V AGND - V EE , V AGND increasing 28.5 V
V EE Undervoltage Lockout
Hysteresis
V EE_UVLOH
Port is shutdown if: V AGND - V EE < V EE_
UVLO - V EE_UVLOH
3 V
V
EE
Overvoltage Lockout V
EE_OV
V
AGND
- V
EE
> V
EE_OV
, V
AGND
increasing 62.5 V
V EE Overvoltage Lockout
Hysteresis
V EE_OVH 1 V
Thermal Shutdown Threshold T SHD
Port is shutdown and device resets if the
junction temperature exceeds this limit,
temperature increasing
150
N
C
Thermal Shutdown Hysteresis T SHDH Temperature decreasing 20 N C
OUTPUT MONITOR
OUT Input Current
I BOUT V OUT = V AGND , probing phases 6 F A
Idle Pullup Current at OUT I
DIS
OUTP discharge current, detection and
classification off, port shutdown,
V
OUTP = V AGND - 2.8V
200 265
F A
Short to V EE Detection
Threshold
DCN TH
V OUT - V EE, V OUT decreasing, enabled
during detection
1.5 2.0 2.5 V
Short to V EE Detection
Threshold Hysteresis
DCN HY 220 mV
LOAD DISCONNECT
DC Load-Disconnect Threshold I DCTH
Minimum load current allowed before dis-
connect (DC disconnect active),
V
OUT = 0V
5 7.5 10 mA
AC Load-Disconnect Threshold I ACTH
Current into DET, for I DET < I ACTH the
port powers off (AC disconnect active)
115 130 145 F A