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
9.2.2.5 Design Below a Maximum Current Limit
Some applications require that current limiting must occur below a certain threshold. For this example, assume that 5A must be delivered to the load so that the minimum desired current-limit threshold is 5000 mA. Use the IOS equations and Figure 9-2 to select R(ILIM).
Select the closest 1% resistor less than the calculated value: RILIM = 24.9 k?. This sets the maximum current-limit threshold at 4950 A.
Use the IOS equations, Figure 9-2, and the previously calculated value for R(ILIM) to calculate the minimum resulting current-limit threshold.
The resulting minimum current-limit threshold minimum is 4445 mA and maximum is 4950 mA with a 24.9 k? ± 1%.