ZHCSF29E May 2016 – January 2021 TPS25940-Q1
PRODMIX
- 1 特性
- 2 應用
- 3 說明
- 4 Revision History
- 5 Device Comparison Table
- 6 Pin Configuration and Functions
- 7 Specifications
- 8 Parametric Measurement Information
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9 Detailed Description
- 9.1 Overview
- 9.2 Functional Block Diagram
- 9.3 Feature Description
- 9.4 Device Functional Modes
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10Application and Implementation
- 10.1 Application Information
- 10.2
Typical Application
- 10.2.1 Design Requirements
- 10.2.2
Detailed Design Procedure
- 10.2.2.1 Step by Step Design Procedure
- 10.2.2.2 Programming the Current-Limit Threshold: R(ILIM) Selection
- 10.2.2.3 Undervoltage Lockout and Overvoltage Set Point
- 10.2.2.4 Programming Current Monitoring Resistor—RIMON
- 10.2.2.5 Setting Output Voltage Ramp Time (tdVdT)
- 10.2.2.6 Programing the Power Good Set Point
- 10.2.2.7 Support Component Selections—R6, R7 and CIN
- 10.2.3 Application Curves
- 10.2.4 System Examples
- 11Power Supply Recommendations
- 12Layout
- 13Device and Documentation Support
- 14Mechanical, Packaging, and Orderable Information
9.3.4 Overload and Short Circuit Protection
At all times load current is monitored by sensing voltage across an internal sense resistor. During overload events, current is limited to the current limit (I(LIM)) programmed by R(ILIM) resistor as shown in Equation 4.
Equation 4. 
where
- I(LIM) is overload current limit in Ampere
- R(ILIM) is the current limit resistor in kΩ
The device incorporates two distinct levels: a current limit (I(LIM)) and a fast-trip threshold (I(FASTRIP)). Fast trip and current limit operation are shown in Figure 9-3.
Bias current on ILIM pin directly controls current-limiting behavior of the device, and PCB routing of this node must be kept away from any noisy (switching) signals.