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參數(shù)資料
型號(hào)： TPS2541RTET
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 電源管理
英文描述： 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC16
封裝： GREEN, PLASTIC, WQFN-16
文件頁(yè)數(shù)： 20/37頁(yè)
文件大?。?/td> 999K
代理商： TPS2541RTET
SHORT _ min
1.037
ILIMx
48000
I
R
=
SHORT _ max
0.962
ILIMx
48000
I
R
=
0
750
3000
3250
I S
H
O
R
T
-
C
u
rr
e
n
t
L
im
it
-
m
A
1250
2000
0
20
40
120 140
180 200
R
ILIM - Current Limit Resistance - kW
100
80
220
2750
2500
2250
1750
1500
1000
500
250
160
60
I
SHORT_min
I
SHORT_max
500
1250
I S
H
O
R
T
-
C
u
rr
e
n
t
L
im
it
-
m
A
1750
2500
10
15
20
35
40
50
55
R
ILIM - Current Limit Resistance - kW
30
60
3250
3000
2750
2250
2000
1500
1000
750
45
25
I
SHORT_min
I
SHORT_max
SLVSAG2A
– OCTOBER 2010 – REVISED APRIL 2011
APPLICATION INFORMATION
Programming the Current Limit Threshold
There are two overcurrent thresholds, which are user programmable via RILIM0 and RILIM1. The TPS2540/40A/41
uses an internal regulation loop to provide a regulated voltage on the ILIM0 and ILIM1 pins. The current-limit
thresholds are proportional to the current sourced out of ILIM0 and ILIM1. The recommended 1% resistor range
for RILIM0 and RILIM1 are 16.9 kΩ ≤ RILIM ≤ 750 kΩ to ensure stability of the internal regulation loop, although not
exceeding 210 k
Ω results in a better accuracy. Many applications require that the minimum current limit is above
a certain current level or that the maximum current limit is below a certain current level, so it is important to
consider the tolerance of the overcurrent threshold when selecting a value for RILIMx. The following equations
calculates the resulting overcurrent threshold for a given external resistor value (RILIMx). The traces routing the
RILIMx resistors to the TPS2540/40A/41 should be as short as possible to reduce parasitic effects on the
current-limit accuracy.
The equations and the graph below can be used to estimate the minimum and maximum variation of the current
limit threshold for a predefined resistor value. This variation is an approximation only and does not take into
account the resistor tolerance or the variation of ILIM. For exact variation of ILIM, refer to the current limit section
of the electrical specification table.
(4)
(5)
Current Limit Threshold
vs
Current Limit Resistance
Figure 41.
Figure 42.
Copyright
2010–2011, Texas Instruments Incorporated
27
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