Datasheet

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TPS2384
SLUS634D – NOVEMBER 2004 – REVISED MARCH 2007
ELECTRICAL CHARACTERISTICS (continued)
V48 = 48 V, R
T
= 124 k Ω , C
T
= 220 pF, C
INT
= 0.027 µ F (low leakage), –40 ° C to 125 ° C and T
A
= T
J
(unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
Port Discovery
Port off #P to #N input resistance 400 600 k Ω
Discovery open circuit voltage 22 30
Discovery 1 voltage loop control 70 µ A < I
PORT
< 3 mA 2.8 4.4 V
Discovery 2 voltage loop control 70 µ A < I
PORT
< 3 mA 8.8 10
Discovery current limit P = N = 48 V 3 4 5 mA
Auto-mode discovery resistance
19 26.5
acceptance Band
Auto-mode discovery resistance low end
0 15 k Ω
rejection
Auto-mode discovery resistance high end
33
rejection
Discovery1,2 A/D conversion scale factor 100 µ A < I
PORT
< 3 mA 5.30 6.10 6.75 count/ µ A
Discovery1,2 A/D conversion time I
PORT
= 120 µ A ms
Port Classification
Classification voltage loop controll 100 µ A < I
PORT
< 50 mA 15 17.5 20 V
Classification current limit P = N = 48 V 50 60 100
Class 0 to 1 detection threshold 5.5 6.5 7.5
Class 1 to 2 detection threshold 13 14.5 16
mA
Class 2 to 3 detection threshold 21 23 25
Class 3 to 4 detection threshold 31 33 35
Class 4 to 0 detection threshold 45 48 51
Count/m
Classification A/D conversion scale factor 375 424 475
A
Classification A/D conversion time I
PORT
= 50 mA 18 22 ms
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 < V
PORT
< 17.5 V 1365 1400 1445 Count/V
factor
Legacy A/D conversion time 0 V < V
PORT
< 15 V 18 22 ms
Port Powered Mode
Port on resistance 20 mA < I
PORT
< 300 mA 1.3 1.8 Ω
Over current threshold (I
CUT
) 350 375 400
R
BIAS
= 124 k Ω , C
T
= 220 pF, –25 ≤ T
J
≤ 105
Output current limit (I
LIM
) 425 450 mA
Disconnect timer current threshold R
BIAS
= 124 k Ω , C
T
= 220 pF 7.5 10
T
MPDO
, disconnect detection time R
BIAS
= 124 k Ω , C
T
= 220 pF, I
LOAD
< current threshold 300 400 ms
Port output UV 42.0 42.7 44.0
V
Port output OV 54 55 56
Over current time out (T
OVLD
) R
BIAS
= 124 k Ω , C
T
= 220 pF 50 75
Short circuit time out (T
LIM
) R
BIAS
= 124 k Ω , C
T
= 220 pF 50 75
ms
R
BIAS
= 124 k Ω , C
T
= 220 pF, After port enabled and
Turn--off delay from UV/OV faults 3
ramped up
Count/m
Port current A/D conversion scale factor 20 mA < I
PORT
< 56 V 31 36.41 40
A
Port curent A/D conversion time I
PORT
< 300 mA 18 22 ms
Port voltage A/D conversion scale factor 335 353 370 Count/V
45 V < V
PORT
< 56 V
Port voltage A/D conversion time 18 22 ms
Port temperature A/D conversion (17500 - counts)/16 ° C
4
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