SLUSCU0I March   2018  – September 2020

PRODUCTION DATA

1. Features
2. Applications
3. Description
4. Revision History
5. Description (continued)
6. Device Comparison Table
7. Pin Configuration and Functions
8. Specifications
9. Detailed Description
1. 9.1 Overview
2. 9.2 Functional Block Diagram
3. 9.3 Feature Description
4. 9.4 Device Functional Modes
1. 9.4.1 Power Modes
10. 10Application and Implementation
1. 10.1 Application Information
1. 10.1.1 Recommended System Implementation
2. 10.2 Typical Application
11. 11Power Supply Recommendations
12. 12Layout
13. 13Device and Documentation Support
14. 14Mechanical, Packaging, and Orderable Information

• PW|24

#### 10.1.1.5 Temperature Protection

The device detects temperature by checking the voltage divided by RTS_PU and RTS, with the assumption of using 10 KΩ RTS_PU and 103AT NTC for RTS. System designers should always check the thermistor resistance characteristic and refer to the temperature protection threshold specification in the Electrical Characteristics table to determine if a different pull up resistor should be used. If a different temperature trip pint is required, it is possible to scale the threshold using this equation: Temperature Protection Threshold = RTS/(RTS + RTS_PU).

Example: Scale OTC trip points from 50°C to 55°C

The OTC protection can be set to 45°C or 50°C. When the device's OTC threshold is set to 50°C, it is referred to configure the VOTC parameter to 29.38% of VTB (typical), with the assumption of RTS_PU = 10 KΩ and RTS = 103AT or similar NTC (which the NTC resistance at 50°C = 4.16KΩ). The VOTC specification is the resistor divider ratio of RTS_PU and RTS.

The VOTC, VOTD, VUTC, and VUTD configuration options are fixed in the device. Hence, the actual temperature trip point can only adjust by using a different B-value NTC and/or using a different RTS_PU.

In this example, the 103AT NTC resistance at 55°C is 3.536 KΩ. By changing the RTS_PU from 10 KΩ to 8.5 KΩ, we can scale the actual OTC temperature trip point from 50°C to 55°C. Because the RTS_PU value is smaller, this change affects all the other temperature trip points and scales OTD, UTC, and UTD with the largest impact to OTD.