Datasheet

OUT1
OUT2
IN
IN
GND
FAULT1
ILIM
EN2
2x R
FAULT
100 kΩ
Control Signal
2.5V – 6.5V
VOUT1
TPS2560/61
0.1 Fμ
FaultSignal
Power Pad
VOUT2
EN1
Control Signal
FAULT2
Fault Signal
2x C
LOAD
R2
22.1 kΩ
Current Limit
Control Signal
Q1
R1
187 kΩ
TPS2560
TPS2561
www.ti.com SLVS930A –DECEMBER 2009– REVISED FEBRUARY 2012
TWO-LEVEL CURRENT-LIMIT CIRCUIT
Some applications require different current-limit thresholds depending on external system conditions. Figure 21
shows an implementation for an externally controlled, two-level current-limit circuit. The current-limit threshold is
set by the total resistance from ILIM to GND (see previously discussed Programming the Current-Limit Threshold
section). A logic-level input enables/disables MOSFET Q1 and changes the current-limit threshold by modifying
the total resistance from ILIM to GND. Additional MOSFET/resistor combinations can be used in parallel to
Q1/R2 to increase the number of additional current-limit levels.
NOTE
ILIM should never be driven directly with an external signal.
Figure 21. Two-Level Current-Limit Circuit
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