SLVS850A June 2008 – September 2023 TPS2551-Q1
PRODUCTION DATA
Some applications require different current-limit thresholds depending on external system conditions. Figure 9-1 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 MOSFETs/resistor combinations can be used in parallel to Q1/R2 to increase the number of additional current-limit levels.
Do not drive the ILIM directly with an external signal.