SBAS933B November   2019  – March 2021

PRODUCTION DATA

1. Features
2. Applications
3. Description
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 Applications
1. 9.2.1 Incremental Rotary Encoding Application
10. 10Power Supply Recommendations
11. 11Layout
12. 12Device and Documentation Support
13. 13Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

• DBV|5

8.3.6 Power Derating

The device is specified from –40 °C to 125 °C for a voltage rating of 2.5 V to 38 V. Because the part is draining at its maximum a current of 17 mA the maximum voltage that can be applied will depend on what is the maximum ambient temperature acceptable for the application. The curve in Figure 8-23 shows the maximum acceptable power supply voltage versus the maximum acceptable ambient temperature.

The Figure 8-23 can also be calculated using the following formulas:

Equation 1.

where

• TJ is the junction temperature
• TA is the ambient temperature
• ΔT is the difference between the junction temperature and the ambient temperature
Equation 2.

where

• PD is the power dissipated by the part
• RθJA is the junction to ambiant thermal resistance
Equation 3.

where

• VCC is the voltage supply of the device
• ICC is the current consumption of the device

Combining the three equations above gives Equation 4 below:

Equation 4.

This equation gives the maximum voltage the part can handle in regards of the ambient temperature.

For example, in the application required to work within a ambient temperature of maximum 85 °C, with TJmax, RθJA and ICCmax are defined in the data sheet, the maximum voltage allowed for this application is determined in Equation 5:

Equation 5.
Figure 8-23 Power Derating Curve