ZHCSIW7B October 2018 – January 2020 TPS25982
PRODUCTION DATA.
- 1 特性
- 2 應用
- 3 說明
- 4 修訂歷史記錄
- 5 器件比較表
- 6 Pin Configuration and Functions
- 7 Specifications
-
8 Detailed Description
- 8.1 Overview
- 8.2 Functional Block Diagram
- 8.3 Feature Description
- 8.4 Fault Response
- 8.5 Device Functional Modes
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9 Application and Implementation
- 9.1 Application Information
- 9.2
Typical Application: Standby Power Rail Protection in Datacenter Servers
- 9.2.1 Design Requirements
- 9.2.2
Detailed Design Procedure
- 9.2.2.1 Device Selection
- 9.2.2.2 Setting the Current Limit Threshold: RILIM Selection
- 9.2.2.3 Setting the Undervoltage Lockout Set Point
- 9.2.2.4 Choosing the Current Monitoring Resistor: RIMON
- 9.2.2.5 Setting the Output Voltage Ramp Time (TdVdt)
- 9.2.2.6 Setting the Load Handshake (LDSTRT) Delay
- 9.2.2.7 Setting the Transient Overcurrent Blanking Interval (tITIMER)
- 9.2.2.8 Setting the Auto-Retry Delay and Number of Retries
- 9.2.3 Application Curves
- 9.3 System Examples
- 10Power Supply Recommendations
- 11Layout
- 12器件和文檔支持
- 13機械、封裝和可訂購信息
9.2.2.8 Setting the Auto-Retry Delay and Number of Retries
The time delay between retries can be programmed by selecting capacitor CRETRY_DLY on RETRY_DLY pin. The value of CRETRY_DLY to set a 100-ms auto-retry delay can be calculated using Equation 27.
Choose closest available standard value: 2.2 nF, 10 %.
The number of auto-retry attempts can be set by a capacitor CNRETRY on the NRETRY pin using Equation 28
For this design example, the requirement is to retry 4 times after the device shuts down due to a fault. Since, the number of auto-retries can be adjusted in discrete steps as explained in Fault Response, choose CNRETRY such that NRETRY is less than 4. Use Equation 29 to calculate CNRETRY.
Choose closest available standard value: 2.2 nF, 10 %.