ZHCSC61B March 2014 – September 2020 TPS2556-Q1 , TPS2557-Q1
PRODUCTION DATA
- 1 特性
- 2 应用
- 3 说明
- 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
10.2.2.3 Selecting Current-Limit Resistor 1
Some applications require that current limiting not occur below a certain threshold. For this example, assume that 3 A must be delivered to the load so that the minimum desired current-limit threshold is 3 000 mA. Use the IOS equations and Figure 10-2 to select R(ILIM).
Equation 2. 
Select the closest 1% resistor less than the calculated value: R(ILIM) = 33.6 kΩ. This sets the minimum current-limit threshold at 3 000 mA . Use the IOS equations, Figure 10-2, and the previously calculated value for R(ILIM) to calculate the maximum resulting current-limit threshold.
Equation 3. 
The resulting maximum current-limit threshold is 3 564 mA with a 33.6-kΩ resistor.