Datasheet

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TPS23841
SLUS745A – NOVEMBER 2006 – REVISED MAY 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 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
I
CUT
Over current threshold R
BIAS
= 124 k Ω , C
T
= 220 pF, 570 615 665
I
LIM
Output current limit 600 650 700
mA
I
LIM
- Threshold delta 2 70
I
CUT
Disconnect timer current threshold R
BIAS
= 124 k Ω , C
T
= 220 pF 7.5 10
T
MPDO
Disconnect detection time I
LOAD
< current threshold, R
BIAS
= 124 k Ω , C
T
= 300 400
ms
220 pF
Port output UV 42.0 42.7 44.0
V
Port output OV 54 55 56
T
OVLD
Over current time out R
BIAS
= 124 k Ω , C
T
= 220 pF 50 75
T
LIM
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 20 mA < I
PORT
< 56 V 31 36.41 40 Count/m
factor A
Port current A/D conversion time I
PORT
< 300 mA 18 22 ms
Port voltage A/D conversion scale 335 353 370 Count/V
factor
45 V < V
PORT
< 56 V
Port voltage A/D conversion time 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 – low output voltage 0 0.5
AC_LO – high output voltage 3.0 5.0 V
AC_HI – high output voltage 5.0 7.0
5
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