ZHCSNO6B February 2023 – March 2024 TPS628301 , TPS628302 , TPS628303 , TPS628304
PRODUCTION DATA
- 1
- 1 特性
- 2 應用
- 3 說明
- 4 Device Options
- 5 Pin Configuration and Functions
- 6 Specifications
- 7 Detailed Description
- 8 Application and Implementation
- 9 Device and Documentation Support
- 10Revision History
- 11Mechanical, Packaging, and Orderable Information
7.3.3 Start-Up and Soft Start
When the EN voltage goes High, the device starts loading the default values into the device registers. This action typically is done within 120 μs. After that, the internal soft-start circuitry controls the output voltage during start-up. This control avoids excessive inrush current and makes sure of a controlled output voltage ramp. This control also prevents unwanted voltage drops from high-impedance power sources or batteries. Finally, the PG signal has a delay up to 180 μs at start-up. Figure 7-5 shows a start-up sequence, where the EN pin is pulled up to VIN.
Figure 7-3 Start-Up Timing When EN is
Pulled Up to VINFigure 7-4 shows a start-up sequence, where an external signal is connected to the EN pin.
Figure 7-4 Start-Up Timing When an
External Signal is Connected to the EN PinThe TPS62830x can start into a prebiased output if enabled for the first time. For a new prebiased operation, a power cycle is needed to disable the active output discharge. Figure 7-5 shows a start-up into a prebiased output voltage.
Figure 7-5 Start-Up into a Prebiased
Output