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| TPS23841_07 Datasheet, PDF (5/52 Pages) Texas Instruments – HIGH-POWER, WIDE VOLTAGE RANGE, QUAD-PORT ETHERNET POWER SOURCING EQUIPMENT MANAGER | |||
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TPS23841
SLUS745 â NOVEMBER 2006
ELECTRICAL CHARACTERISTICS (continued)
V48 = 48 V, RT = 124 kâ¦, CT = 220 pF, CINT = 0.027 µF (low leakage), â40°C to 125°C and TA = TJ (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN TYP MAX UNIT
Port Legacy Detection
Legacy current limit
P = N = 48 V
2.6
3.5 4.3 mA
Legacy voltage A/D conversion scale 100 mV < VPORT < 17.5 V
factor
1365 1400 1445 Count/V
Legacy A/D conversion time
Port Powered Mode
0 V < VPORT < 15 V
18
22 ms
Port on resistance
ICUT
ILIM
ILIM -
ICUT
Over current threshold
Output current limit
Threshold delta
Disconnect timer current threshold
TMPDO Disconnect detection time
20 mA < IPORT < 300 mA
RBIAS = 124 kâ¦, CT = 220 pF,
RBIAS = 124 kâ¦, CT = 220 pF
ILOAD < current threshold, RBIAS = 124 kâ¦, CT =
220 pF
1.3 1.8 â¦
570
615 665
600
650 700
10
70 mA
7.5
10
300
400 ms
Port output UV
Port output OV
42.0 42.7 44.0
V
54
55
56
TOVLD Over current time out
RBIAS = 124 kâ¦, CT = 220 pF
50
75
TLIM Short circuit time out
RBIAS = 124 k., CT = 220 pF
50
75 ms
Turn--off delay from UV/OV faults
RBIAS = 124 k., CT = 220 pF, After port enabled
3
and ramped up
Port current A/D conversion scale
factor
20 mA < IPORT < 56 V
31 36.41
40 Count/m
A
Port current A/D conversion time
Port voltage A/D conversion scale
factor
Port voltage A/D conversion time
IPORT < 300 mA
45 V < VPORT < 56 V
18
22 ms
335
353 370 Count/V
18
22 ms
Port temperature A/D conversion
(17500 - counts)/16
°C
Port Disable Mode
Port N voltage
P = 48 V
47
V
AC LO and AC HI Specification
AC_LO, AC_HI â low output voltage
0
0.5
AC_LO â high output voltage
3.0
5.0 V
AC_HI â high output voltage
5.0
7.0
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