ZHCSMS3 December 2020 TPS54622-EP
PRODUCTION DATA
- 1 特性
- 2 應(yīng)用
- 3 說明
- 4 Revision History
- 5 Pin Configurations 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 Continuous Current Mode Operation (CCM)
- 7.3.3 VIN and Power VIN Pins (VIN and PVIN)
- 7.3.4 Voltage Reference
- 7.3.5 Adjusting the Output Voltage
- 7.3.6 Safe Start-Up Into Prebiased Outputs
- 7.3.7 Error Amplifier
- 7.3.8 Slope Compensation
- 7.3.9 Enable and Adjusting Undervoltage Lockout
- 7.3.10 Adjustable Switching Frequency and Synchronization (RT/CLK)
- 7.3.11 Slow Start (SS/TR)
- 7.3.12 Power Good (PWRGD)
- 7.3.13 Output Overvoltage Protection (OVP)
- 7.3.14 Overcurrent Protection
- 7.3.15 Thermal Shutdown
- 7.3.16 Small Signal Model for Loop Response
- 7.3.17 Simple Small Signal Model for Peak Current Mode Control
- 7.3.18 Small Signal Model for Frequency Compensation
- 7.4 Device Functional Modes
-
8 Application and Implementation
- 8.1 Application Information
- 8.2
Typical Application
- 8.2.1 Design Requirements
- 8.2.2
Detailed Design Procedures
- 8.2.2.1 Custom Design With WEBENCH? Tools
- 8.2.2.2 Operating Frequency
- 8.2.2.3 Output Inductor Selection
- 8.2.2.4 Output Capacitor Selection
- 8.2.2.5 Input Capacitor Selection
- 8.2.2.6 Slow-Start Capacitor Selection
- 8.2.2.7 Bootstrap Capacitor Selection
- 8.2.2.8 Undervoltage Lockout Setpoint
- 8.2.2.9 Output Voltage Feedback Resistor Selection
- 8.2.2.10 Compensation Component Selection
- 8.2.2.11 Fast Transient Considerations
- 8.2.3 Application Curves
- 9 Power Supply Recommendations
- 10Layout
- 11Device and Documentation Support
- 12Mechanical, Packaging, and Orderable Information
封裝選項
機(jī)械數(shù)據(jù) (封裝 | 引腳)
- RHL|14
散熱焊盤機(jī)械數(shù)據(jù) (封裝 | 引腳)
訂購信息
3 說明
TPS54622-EP 器件采用熱增強(qiáng)型 3.5mm × 3.5mm VQFN 封裝，是一款功能齊全的 17V、6A 同步降壓轉(zhuǎn)換器；該器件具有高效率且集成了高側(cè)和低側(cè) MOSFET，經(jīng)過優(yōu)化可實現(xiàn)小型設(shè)計。通過采用電流模式控制來減少元件數(shù)量，同時選擇高開關(guān)頻率來縮小電感器尺寸，從而進(jìn)一步節(jié)省空間。
輸出電壓啟動斜坡由 SS/TR 引腳控制，該引腳既支持獨立電源運行，又支持跟蹤模式。此外，正確配置使能與開漏電源良好引腳也可實現(xiàn)電源定序。
高側(cè) FET 的逐周期電流限制可在過載情況下保護(hù)器件，并通過低側(cè)拉電流限制防止電流失控，增強(qiáng)限制效果。此外，還提供可關(guān)閉低側(cè) MOSFET 的低側(cè)灌電流限制，防止反向電流過大。當(dāng)過流持續(xù)時間超出預(yù)設(shè)時間時，將觸發(fā)間斷保護(hù)。當(dāng)裸片溫度超過熱關(guān)斷溫度時，熱斷續(xù)保護(hù)功能將禁用該器件，并在內(nèi)置熱關(guān)斷斷續(xù)時間后重新啟用該部件。
器件信息
| 器件型號 | 封裝(1) | 封裝尺寸（標(biāo)稱值） |
|---|---|---|
| TPS54622-EP | VQFN (14) | 3.50mm × 3.50mm |
(1) 如需了解所有可用封裝，請參閱數(shù)據(jù)表末尾的可訂購產(chǎn)品附錄。
簡化版原理圖
效率與負(fù)載電流間的關(guān)系