ZHCSC61B March 2014 – September 2020 TPS2556-Q1 , TPS2557-Q1
PRODUCTION DATA
- 1 特性
- 2 應用
- 3 說明
- 4 Revision History
- 5 Device Comparison Table
- 6 Terminal Configuration and Functions
- 7 Specifications
- 8 Parameter Measurement Information
- 9 Detailed Description
- 10Applications and Implementation
- 11Power Supply Recommendations
- 12Layout
- 13Device and Documentation Support
- 14Mechanical, Packaging, and Orderable Information
9.4.4 Two-Level Current-Limit Circuit
Some applications require different current-limit thresholds depending on external system conditions. Figure 9-3 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 Programming the Current-Limit Threshold). A logic-level input enables and disables MOSFET Q1 and changes the current-limit threshold by modifying the total resistance from ILIM to GND. One can use additional MOSFET and resistor combinations in parallel with Q1 and R2 to increase the number of additional current-limit levels.
Never drive ILIM directly with an external signal.
Figure 9-3 Two-Level Current-Limit Circuit