SLVSCL5A June 2014 – November 2020 TPS2559
PRODUCTION DATA
Some applications require different current-limit thresholds depending on external system conditions. Figure 9-5 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 the Section 9.2.2.3 section). A logic-level input enables/disables MOSFET Q1 and changes the current-limit threshold by modifying the total resistance from ILIM to GND (see Figure 9-14 and Figure 9-15). Additional MOSFET/resistor combinations can be used in parallel to Q1/R2 to increase the number of additional current-limit levels.
ILIM must never be driven directly with an external signal.