SLVSB71E February   2012  – September 2016

PRODUCTION DATA.

1. Features
2. Applications
3. Description
1.     Device Images
4. Revision History
5. Device Comparison Table
6. Pin Configuration and Functions
7. Specifications
8. Detailed Description
1. 8.1 Overview
2. 8.2 Functional Block Diagram
3. 8.3 Feature Description
4. 8.4 Device Functional Modes
9. Application and Implementation
1. 9.1 Application Information
2. 9.2 Typical Application
1. 9.2.1 Design Requirements
2. 9.2.2 Detailed Design Procedure
1. 9.2.2.1 Programming the Output Voltage
2. 9.2.2.2 External Component Selection
1. 9.2.2.2.1 Inductor Selection
2. 9.2.2.2.2 Capacitor Selection
3. 9.2.2.3 Tracking Function
4. 9.2.2.4 Output Filter and Loop Stability
3. 9.2.3 Application Curves
3. 9.3 System Examples
10. 10Power Supply Recommendations
11. 11Layout
12. 12Device and Documentation Support
13. 13Mechanical, Packaging, and Orderable Information

• RGT|16
• RGT|16

8.4.4 Current Limit and Short Circuit Protection

The TLV62150 devices are protected against heavy load and short circuit events. At heavy loads, the current limit determines the maximum output current. If the current limit is reached, the high-side FET is turned off. Avoiding shoot through current, then the low-side FET switches on to allow the inductor current to decrease. The low-side current limit is typically 1.2 A. The high-side FET turns on again, only if the current in the low-side FET has decreased below the low side current limit threshold.

The output current of the device is limited by the current limit (see Electrical Characteristics). Due to internal propagation delay, the actual current can exceed the static current limit during that time. The dynamic current limit can be calculated as follows:

spacing

Equation 4.

where

• ILIMF is the static current limit, specified in the Electrical Characteristics.
• L is the inductor value.
• VL is the voltage across the inductor (VIN - VOUT).
• tPD is the internal propagation delay.

The current limit can exceed static values, especially if the input voltage is high and very small inductances are used. The dynamic high side switch the peak current can be calculated as follows:

spacing

Equation 5.