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TPS2480PW Datasheet(PDF) 23 Page - Texas Instruments

Part # TPS2480PW
Description  Positive Voltage Intelligent Protection Device Hotswap Controller and I2C Current Monitor
PDF  60 Pages
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Manufacturer  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

TPS2480PW Datasheet(HTML) 23 Page - Texas Instruments

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2
LIM(ACT)
VCC(MAX)
LIM(ACT)
VCC(MAX)
LIMIT(NOM)
2
LIMIT(NOM)
LIM(ACT)
P
V
For P
V
I
2
I
2
P
´
´
<
´
=
+
´
´
O
O
ON
C
C
: t
VCC(MAX)
LIM(ACT)
VCC(MAX)
LIMIT(NOM)
LIMIT(NOM)
V
For P
V
I
I
O
ON
C
: t
´
³
´
=
2
2
LIM(ACT)
VCC(MAX)
2
2
LIMIT(NOM)
LIM(ACT)
P
V
1000
13 5
1000
249W
416
2
I
2
P
2
50
2
249W
´
´
´
´
=
+
=
+
=
´
´
´
´
O
O
ON
C
C
F
. V
F
t
s
A
m
m
m
SOURCE(MAX)
T
O-TOL
T-TOL
TMR-TH(MAX)
I
C
1
C
C
V
ON
t
(
)
=
´
´
+
+
T
34
C
416
1
0 2
0 1
4 48
4.1V
=
´
´
+
+
=
A
s (
.
. )
.
nF
m
m
1
2
EN_H(MAX)
1
55 22
V
ON
EN
EN
V
R
R
(
)
.
k
=
´
-
=
W
1
2
1
2
EN_H(MAX)
EN_L(MIN)
2
2
V
V
EN
EN
EN
EN
ON
OFF
EN
EN
R
R
R
R
V
,V
R
R
+
+
=
´
=
´
54 9
10
1 38
8 96
10
ON
. k
k
V
.
V
.
V
k
W +
W
=
´
=
W
54 9
10
1 22
7 92
10
OFF
. k
k
V
.
V
.
V
k
W +
W
=
´
=
W
TPS2480
TPS2481
www.ti.com
SLUS939B – APRIL 2010 – REVISED DECEMBER 2010
4. Choose the Timer Capacitor, CT and Turn On Time
The turn on time tON, represents the time it takes the circuit to charge up the output capacitance CO and load. CT
programs the fault time and should be chosen so that the fault timer does not terminate prior to completion of
start up. The turn on time is a function of the type of control; current limit, power limit, or dV/dt control. The next
equation calculates tON for both the power limit and current limit cases and assumes that only CO draws current
during startup.
(17)
(18)
(19)
The next equation allows CT to be selected assuming that only CO draws current during startup. TPS2480/81
timer current source and capacitor tolerances are accounted for.
(20)
(21)
•
Choose CT = 0.01 µF
5. Choose the Turn On Voltage, VON and the EN Resistors, REN1 and REN2
When the EN pin is used as an analog control, the desired turn on voltage, VON can be used to select the EN
resistors. Select REN1 and REN2 taking into account device leakage currents. Choose REN2 =10 kΩ.
(22)
•
Choose REN2 = 54.9 kΩ
The actual turn on and turn off voltages, VON(ACT) and VOFF(ACT) can be calculated as follows:
(23)
(24)
(25)
Copyright © 2010, Texas Instruments Incorporated
Submit Documentation Feedback
23
Product Folder Link(s): TPS2480 TPS2481



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