Datasheet

0
900
1000
I
SHORT
- Current Limit - mA
400
600
60 80 100 160 180 220
R
ILIM
- Current Limit Resistance - kW
140
800
700
500
300
200
100
200120
I
SHORT_min
I
SHORT_max
MIN
1.037
ILIMx
48000
IOS 2500mA
R
= =
1
1
1.037
1.037
ILIMx
MIN
48000 48000
R 17.28kΩ
IOS 2500mA
é ù
é ù
= = =
ê ú
ê ú
ë û
ë û
ILIMx
17.28kΩ
R 17.11kΩ
1.01
= =
ILIMx
R 16.9kΩ=
TPS2540, TPS2540A
TPS2541, TPS2541A
www.ti.com SLVSAG2C –OCTOBER 2010– REVISED OCTOBER 2011
Current Limit Threshold
vs
Current Limit Resistance
Figure 42.
Current Limit Setpoint Example
In the following example, choose the ILIM resistor to ensure that the TPS2540/40A/41/41A does not trip off under
worst case conditions of ILIM and resistor tolerance (assume 1% resistor tolerance). For this example, IOS
MIN
=
2500 mA.
(6)
(7)
Including resistor tolerance, target maximum:
(8)
Choose:
(9)
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Product Folder Link(s): TPS2540, TPS2540A TPS2541, TPS2541A