ZHCSCZ1B june 2014 – may 2023 TPS65262-1
PRODUCTION DATA
- 1
- 1 特性
- 2 应用
- 3 说明
- 4 Revision History
- 5 Device Comparison Table
- 6 Pin Configuration and Functions
- 7 Specifications
-
8 Detailed Description
- 8.1 Overview
- 8.2 Functional Block Diagram
- 8.3
Feature Description
- 8.3.1 Adjusting the Output Voltage
- 8.3.2 Enable and Adjusting UVLO
- 8.3.3 Soft-Start Time
- 8.3.4 Power-Up Sequencing
- 8.3.5 V7V Low Dropout Regulator and Bootstrap
- 8.3.6 Out-of-Phase Operation
- 8.3.7 Output Overvoltage Protection (OVP)
- 8.3.8 PSM
- 8.3.9 Slope Compensation
- 8.3.10 Overcurrent Protection (OCP)
- 8.3.11 Power Good
- 8.3.12 Thermal Shutdown
- 8.4 Device Functional Modes
- 9 Application and Implementation
- 10Device and Documentation Support
- 11Mechanical, Packaging, and Orderable Information
8.3.4.2 Automatic Power Sequencing
The TPS65262-1 starts with a predefined power-up and power-down sequence when the MODE pin is driven to high. As shown in Table 8-2, the sequence is dictated by different combinations of the EN1 and EN2 status. EN3 is used to start or stop the converters. Buck2 and buck3 are identical converters and can be swapped in the system operation to allow for additional sequencing stages. Figure 8-4 shows the power sequencing when EN1 and EN2 are pulled up high.
Table 8-2 Power Sequencing
| MODE | EN1 | EN2 | EN3 | Start Sequencing | Shutdown Sequencing | |
|---|---|---|---|---|---|---|
| Automatic power sequencing | High | High | High | Used to start or stop bucks in sequence | Buck1→buck2→buck3 | Buck3→buck2→buck1 |
| High | Low | High | Buck2→buck1→buck3 | Buck3→buck1→buck2 | ||
| High | High | Low | Buck2→buck3→buck1 | Buck1→buck3→buck2 | ||
| High | Low | Low | Reserved | Reserved | Reserved | |
| Externally controlled sequencing | Low | Used to start or stop buck1 | Used to start or stop buck2 | Used to start or stop buck3 | x | x |
Figure 8-4 Automatic Power Sequencing