ZHCSCR7A June 2014 – November 2020 TPS2559
PRODUCTION DATA
- 1 特性
- 2 應用
- 3 說明
- 4 Revision History
- 5 Device Comparison Table
- 6 Pin Configuration and Functions
- 7 Specifications
- 8 Detailed Description
-
9 Application and Implementation
- 9.1 Application Information
- 9.2
Typical Application
- 9.2.1 Design Requirements
- 9.2.2
Detailed Design Procedure
- 9.2.2.1 Step-by-Step Design Procedure
- 9.2.2.2 Input and Output Capacitance
- 9.2.2.3 Programming the Current-Limit Threshold
- 9.2.2.4 Design Above a Minimum Current Limit
- 9.2.2.5 Design Below a Maximum Current Limit
- 9.2.2.6 Accounting for Resistor Tolerance
- 9.2.2.7 Power Dissipation and Junction Temperature
- 9.2.2.8 Auto-Retry
- 9.2.2.9 Two-Level Current-Limit
- 9.2.3 Application Curves
- 10Power Supply Recommendations
- 11Layout
- 12Device and Documentation Support
- 13Mechanical, Packaging, and Orderable Information
9.2.2.4 Design Above a Minimum Current Limit
Some applications require that current limiting cannot 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 3000 mA. Use the IOS equations and Figure 9-2 to select R(ILIM).
Select the closest 1% resistor less than the calculated value: R(ILIM) = 36.5 kΩ. This sets the minimum current-limit threshold at 3016 A.
Use the IOS equations, Figure 9-2, and the previously calculated value for R(ILIM) to calculate the maximum resulting current-limit threshold.
The resulting maximum current-limit threshold minimum is 3016 mA and maximum is 3387 mA with a 36.5 k? ± 1%.