JAJSGA2F September   2018  – June 2021

PRODUCTION DATA

1. 特長
2. アプリケーション
3. 概要
4. Revision History
5. Device Comparison Table
6. Pin Configuration and Functions
7. Specifications
8. Parameter Measurement Information
9. Detailed Description
1. 9.1 Overview
2. 9.2 Functional Block Diagram
3. 9.3 Feature Description
4. 9.4 Device Functional Modes
10. 10Application and Implementation
1. 10.1 Application Information
2. 10.2 Typical Application: Power Path Protection in a PLC System
1. 10.2.1 Design Requirements
2. 10.2.2 Detailed Design Procedure
3. 10.2.3 Application Curves
3. 10.3 System Examples
4. 10.4 Do's and Don'ts
11. 11Power Supply Recommendations
12. 12Layout
13. 13Device and Documentation Support
14. 14Mechanical, Packaging, and Orderable Information

デバイスごとのパッケージ図は、PDF版データシートをご参照ください。

• RGE|24
• PWP|20
• PWP|20
• RGE|24

### 10.3.2 Priority Power MUX Operation

Applications having two energy sources such as Portable battery powered equipment require preference of one source to another. For example, mains power (wall-adapter) has the priority over the internal back-up power or auxiliary power. These applications demand for switch over from mains power to backup power only when main input voltage falls below a user defined threshold. The TPS2663x devices provide a simple solution for priority power multiplexing needs.

Figure 10-12 shows a typical priority power multiplexing implementation using devices. When the MAIN power is present, the device in VIN_MAIN path powers the OUT bus irrespective of whether auxiliary power VIN_AUX is greater than or less than VIN_MAIN. Once the voltage on the VIN_MAIN rail falls below the user-defined threshold, the device VIN_MAIN issues a signal to switch over to auxiliary power VIN_AUX. The transition happens seamlessly in tOVP(dly_fast), with minimal voltage droop on the output. The voltage droop during transition is a function of load current and output capacitance. See Equation 13.

Equation 13.

where

• V(DROOP) is in volts, I(LOAD) is load current in Ampere, C(OUT) is output capacitance in µF, tOVP(fast_dly) = 140 µs (typical)

Figure 9-13, Figure 9-14, Figure 9-15 and figure 9-16 show typical switch-over waveforms of Priority Muxing implementation using the TPS26630 or TPS26631 for 20-V Primary and 24-V Auxiliary Bus.

Figure 10-12 Priority Power Mux Implementation
Figure 10-13 VIN_MAIN Power Recovery: Change Over from Auxiliary VIN_AUX to Primary Power VIN_MAIN
Figure 10-15 VIN_AUX Brownout Condition
Figure 10-14 VIN_MAIN Brownout Condition: Change Over from Main VIN_MAIN to Auxiliary Power VIN_AUX
Figure 10-16 VIN_AUX Power Recovery