ZHCSBY9G July 2013 – June 2021 TPS54561
PRODUCTION DATA
- 1 特性
- 2 應(yīng)用
- 3 說(shuō)明
- 4 Revision History
- 5 Pin Configuration and Functions
- 6 Specifications
-
7 Detailed Description
- 7.1 Overview
- 7.2 Functional Block Diagram
- 7.3
Feature Description
- 7.3.1 Fixed Frequency PWM Control
- 7.3.2 Slope Compensation Output Current
- 7.3.3 Pulse Skip Eco-mode
- 7.3.4 Low Dropout Operation and Bootstrap Voltage (BOOT)
- 7.3.5 Error Amplifier
- 7.3.6 Adjusting the Output Voltage
- 7.3.7 Enable and Adjusting Undervoltage Lockout
- 7.3.8 Soft Start/Tracking Pin (SS/TR)
- 7.3.9 Sequencing
- 7.3.10 Constant Switching Frequency and Timing Resistor (RT/CLK) Pin)
- 7.3.11 Maximum Switching Frequency
- 7.3.12 Synchronization to RT/CLK Pin
- 7.3.13 Accurate Current Limit Operation
- 7.3.14 Power Good (PWRGD Pin)
- 7.3.15 Overvoltage Protection
- 7.3.16 Thermal Shutdown
- 7.3.17 Small Signal Model for Loop Response
- 7.3.18 Simple Small Signal Model for Peak Current Mode Control
- 7.3.19 Small Signal Model for Frequency Compensation
- 7.4 Device Functional Modes
-
8 Application and Implementation
- 8.1 Application Information
- 8.2
Typical Applications
- 8.2.1
Buck Converter for 7-V to 60-V Input to 5-V at 5-A Output
- 8.2.1.1 Design Requirements
- 8.2.1.2
Detailed Design Procedure
- 8.2.1.2.1 Custom Design with WEBENCH? Tools
- 8.2.1.2.2 Selecting the Switching Frequency
- 8.2.1.2.3 Output Inductor Selection (LO)
- 8.2.1.2.4 Output Capacitor
- 8.2.1.2.5 Catch Diode
- 8.2.1.2.6 Input Capacitor
- 8.2.1.2.7 Slow Start Capacitor
- 8.2.1.2.8 Bootstrap Capacitor Selection
- 8.2.1.2.9 Undervoltage Lockout Set Point
- 8.2.1.2.10 Output Voltage and Feedback Resistors Selection
- 8.2.1.2.11 Compensation
- 8.2.1.2.12 Power Dissipation Estimate
- 8.2.1.2.13 Safe Operating Area
- 8.2.1.2.14 Discontinuous Conduction Mode and Eco-mode Boundary
- 8.2.1.3 Application Curves
- 8.2.2 Inverting Buck-Boost Topology for Positive Input to Negative Output
- 8.2.3 Split-Rail Topology for Positive Input to Negative and Positive Output
- 8.2.1
Buck Converter for 7-V to 60-V Input to 5-V at 5-A Output
- 9 Power Supply Recommendations
- 10Layout
- 11Device and Documentation Support
- 12Mechanical, Packaging, and Orderable Information
封裝選項(xiàng)
機(jī)械數(shù)據(jù) (封裝 | 引腳)
- DPR|10
散熱焊盤(pán)機(jī)械數(shù)據(jù) (封裝 | 引腳)
- DPR|10
訂購(gòu)信息
3 說(shuō)明
TPS54561 是一款具有集成式高側(cè) MOSFET 的 60V、5A、降壓穩(wěn)壓器。按照 ISO 7637 標(biāo)準(zhǔn)，此器件能夠耐受的負(fù)載突降脈沖高達(dá) 65V。它采用電流模式控制，可實(shí)現(xiàn)簡(jiǎn)單的外部補(bǔ)償和靈活的組件選擇。一個(gè)低紋波脈沖跳躍模式將無(wú)負(fù)載時(shí)的電源電流減小至 152μA。當(dāng)使能引腳被拉至低電平時(shí)，關(guān)斷電源電流被減少至 2μA。
欠壓閉鎖在內(nèi)部設(shè)定為 4.3V，但可用使能引腳上的一個(gè)外部電阻分壓器將之提高。輸出電壓?jiǎn)?dòng)斜坡由軟啟動(dòng)引腳控制，該引腳還可被配置用來(lái)控制時(shí)序/跟蹤。開(kāi)漏電源正常信號(hào)表示輸出處于其標(biāo)稱電壓的 93% 至 106% 之間。
寬可調(diào)開(kāi)關(guān)頻率范圍可針對(duì)效率或者外部組件尺寸進(jìn)行優(yōu)化。逐周期電流限制、頻率折返和熱關(guān)斷在過(guò)載條件下保護(hù)內(nèi)部和外部組件。
TPS54561 采用 10 引腳 4mm × 4mm WSON 封裝。
器件信息
| 器件型號(hào) | 封裝(1) | 封裝尺寸（標(biāo)稱值） |
|---|---|---|
| TPS54561 | WSON (10) | 4.00mm × 4.00mm |
(1) 如需了解所有可用封裝，請(qǐng)參閱數(shù)據(jù)表末尾的可訂購(gòu)產(chǎn)品附錄。
簡(jiǎn)化原理圖
效率和負(fù)載電流間的關(guān)系