Datasheet
1.056
ILIM
OSmin
61200V
OSmin
R k
1
1.056
ILIM
OSmin
ILIM
I (mA) = 2000mA
I (mA) =
61200V
R (k ) =
I mA
R (k ) = 25.52k
W
W
W W
æ ö
÷
ç
÷
ç
÷
ç
÷
ç
è ø
ILIM
OSmax
0.957
ILIM
OSmax
0.957
OSmax
R (k ) = 25.5k
52850V
I (mA) =
R k
52850V
I (mA) =
25.5 k
I (mA) = 2382mA
W W
W
W
0.957
ILIM
OSmax
52850V
OSmax
R k
1
0.957
ILIM
OSmax
ILIM
I (mA) = 1000mA
I (mA) =
52850V
R (k ) =
I mA
R (k ) = 63.16k
W
W
W W
æ ö
÷
ç
÷
ç
÷
ç
÷
ç
è ø
63.4
ILIM
OSmin
1.056
ILIM
OSmin
1.056
OSmin
R (k ) = 63.4k
61200V
I (mA) =
R k
61200V
I (mA) =
k
I (mA) = 765mA
W W
W
W
TPS2560
TPS2561
www.ti.com
SLVS930A –DECEMBER 2009– REVISED FEBRUARY 2012
APPLICATION 1: DESIGNING ABOVE A MINIMUM CURRENT LIMIT
Some applications require that current limiting cannot occur below a certain threshold. For this example, assume
that 2 A must be delivered to the load so that the minimum desired current-limit threshold is 2000 mA. Use the
I
OS
equations and Figure 18 to select R
ILIM
.
(2)
Select the closest 1% resistor less than the calculated value: R
ILIM
= 25.5 kΩ. This sets the minimum current-limit
threshold at 2 A . Use the I
OS
equations, Figure 18, and the previously calculated value for R
ILIM
to calculate the
maximum resulting current-limit threshold.
(3)
The resulting maximum current-limit threshold is 2382 mA with a 25.5 kΩ resistor.
APPLICATION 2: DESIGNING BELOW A MAXIMUM CURRENT LIMIT
Some applications require that current limiting must occur below a certain threshold. For this example, assume
that the desired upper current-limit threshold must be below 1000 mA to protect an up-stream power supply. Use
the I
OS
equations and Figure 18 to select R
ILIM
.
(4)
Select the closest 1% resistor greater than the calculated value: R
ILIM
= 63.4 kΩ. This sets the maximum
current-limit threshold at 1000 mA . Use the I
OS
equations, Figure 18, and the previously calculated value for
R
ILIM
to calculate the minimum resulting current-limit threshold.
(5)
The resulting minimum current-limit threshold is 765 mA with a 63.4 kΩ resistor.
Copyright © 2009–2012, Texas Instruments Incorporated Submit Documentation Feedback 13
Product Folder Link(s): TPS2560 TPS2561