ZHCSBP7C October 2013 – December 2018 TPS24750 , TPS24751
UNLESS OTHERWISE NOTED, this document contains PRODUCTION DATA.
- 1 特性
- 2 應(yīng)用
- 3 說明
- 4 修訂歷史記錄
- 5 Device Comparison Table
- 6 Pin Configuration and Functions
- 7 Specifications
- 8 Parameter Measurement Information
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9 Detailed Descriptions
- 9.1 Overview
- 9.2 Functional Block Diagram
- 9.3 Feature Description
- 9.4 Device Functional Modes
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10Application and Implementation
- 10.1 Application Information
- 10.2
Typical Application
- 10.2.1 Design Requirements
- 10.2.2
Detailed Design Procedure
- 10.2.2.1
Power-Limited Start-Up
- 10.2.2.1.1 STEP 1. Choose RSENSE, RSET, and RIMON
- 10.2.2.1.2 STEP 2. Choose Power-Limit Value, PLIM, and RPROG
- 10.2.2.1.3 STEP 3. Choose Output Voltage Rising Time, tON, and Timing Capacitor CT
- 10.2.2.1.4 STEP 4. Calculate the Retry-Mode Duty Ratio
- 10.2.2.1.5 STEP 5. Select R1, R2, and R3 for UV and OV
- 10.2.2.1.6 STEP 6. Choose R4, R5, and C1
- 10.2.2.2 Alternative Design Example: Gate Capacitor (dv/dt) Control in Inrush Mode
- 10.2.2.3 Additional Design Considerations
- 10.2.2.1
Power-Limited Start-Up
- 10.2.3 Application Curves
- 10.3 System Examples
- 11Power Supply Recommendations
- 12Layout
- 13器件和文檔支持
- 14機(jī)械、封裝和可訂購(gòu)信息
封裝選項(xiàng)
機(jī)械數(shù)據(jù) (封裝 | 引腳)
- RUV|36
散熱焊盤機(jī)械數(shù)據(jù) (封裝 | 引腳)
- RUV|36
訂購(gòu)信息
10.2.2.1.5 STEP 5. Select R1, R2, and R3 for UV and OV
Next, select the values of the OV and UV resistors, R1, R2, and R3, as shown in the typical system application diagram Figure 41 . From the TPS2475x electrical specifications, VOVTHRESH = 1.35 V and VENTHRESH = 1.35 V. VOV is the overvoltage trip voltage, which in this case is 14 V. VUV is the undervoltage trip voltage, which for this example equals 8.4 V.
Assume R3 is 1.5 kΩ and use Equation 12 to solve for (R1 + R2). Use Equation 13 and the (R1 + R2) from Equation 12 to solve for R2 and finally for R1. From Equation 12, (R1 + R2) = 14.05 kΩ. From Equation 13, R2 = 1 kΩ and R1 = 13.05 kΩ. Scaling all three resistors by a factor of ten to use less supply current for these voltage references and using standard 1% resistor values gives R1 = 130 kΩ, R2 = 10 kΩ, and R3 = 15 kΩ.