ZHCS361C September 2011 – October 2017 TPS54623
PRODUCTION DATA.
- 1 特性
- 2 應(yīng)用
- 3 說(shuō)明
- 4 修訂歷史記錄
- 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 VIN and Power VIN Pins (VIN and PVIN)
- 7.3.2 Voltage Reference
- 7.3.3 Adjusting the Output Voltage
- 7.3.4 Safe Start-up into Pre-Biased Outputs
- 7.3.5 Error Amplifier
- 7.3.6 Slope Compensation
- 7.3.7 Enable and Adjusting Undervoltage Lockout
- 7.3.8 Slow Start (SS/TR)
- 7.3.9 Power Good (PWRGD)
- 7.3.10 Bootstrap Voltage (BOOT) and Low Dropout Operation
- 7.3.11 Sequencing (SS/TR)
- 7.3.12 Output Overvoltage Protection (OVP)
- 7.3.13 Overcurrent Protection
- 7.3.14 Thermal Shutdown
- 7.3.15 Small Signal Model for Loop Response
- 7.3.16 Simple Small Signal Model for Peak Current Mode Control
- 7.3.17 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 Procedure
- 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 Under Voltage Lockout Set Point
- 8.2.2.9 Output Voltage Feedback Resistor Selection
- 8.2.2.10 Compensation Component Selection
- 8.2.3 Application Curves
- 9 Power Supply Recommendations
- 10Layout
- 11器件和文檔支持
- 12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)
- RHL|14
散熱焊盤機(jī)械數(shù)據(jù) (封裝 | 引腳)
訂購(gòu)信息
1 特性
- 集成 26mΩ 和 19mΩ 金屬氧化物半導(dǎo)體場(chǎng)效應(yīng)晶體管 (MOSFET)
- 分離電源軌：1.6V 至 17V (PVIN)
- 開關(guān)頻率：200kHz 至 1.6MHz
- 跳脈沖模式提高輕載效率
- 與外部時(shí)鐘同步
- 0.6V ±1% 電壓基準(zhǔn)過(guò)熱保護(hù)
- 關(guān)斷時(shí)的靜態(tài)電流低至 2µA
- 單啟動(dòng)至預(yù)偏置輸出
- -40°C 至 150°C 工作結(jié)溫范圍
- 可調(diào)慢啟動(dòng)和電源排序
- 針對(duì)欠壓及過(guò)壓提供電源良好輸出監(jiān)控器
- 可調(diào)節(jié)輸入欠壓鎖定
- 使用 TPS54623 并借助 WEBENCH® 電源設(shè)計(jì)器創(chuàng)建定制設(shè)計(jì)方案
2 應(yīng)用
- 高密度分布式電源系統(tǒng)
- 高性能點(diǎn)的負(fù)載調(diào)整
- 寬帶、網(wǎng)絡(luò)及光纖通信基礎(chǔ)設(shè)施
簡(jiǎn)化電路原理圖
3 說(shuō)明
TPS54623 采用熱增強(qiáng)型 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的特點(diǎn)，針對(duì)小型設(shè)計(jì)進(jìn)行了優(yōu)化。通過(guò)電流模式控制減少組件數(shù)量，并通過(guò)選擇高開關(guān)頻率縮小電感器尺寸來(lái)進(jìn)一步節(jié)省空間。
輸出電壓?jiǎn)?dòng)斜坡由 SS/TR 引腳控制，該引腳既支持獨(dú)立電源運(yùn)行，又支持跟蹤模式。此外，正確配置使能和開路電源正常引腳也可進(jìn)行電源定序。
高側(cè) FET 的逐周期電流限制可在過(guò)載情況下保護(hù)器件，并通過(guò)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(guò)大。在過(guò)流情況持續(xù)時(shí)間超過(guò)預(yù)設(shè)時(shí)間時(shí)，將觸發(fā)斷續(xù)保護(hù)功能。當(dāng)裸片溫度超過(guò)熱關(guān)斷溫度時(shí)，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(shí)間后重新啟用該部件。TPS54623 可在較高負(fù)載條件下始終以持續(xù)電流模式 (CCM) 運(yùn)行，并且能夠在跳過(guò)脈沖時(shí)提升輕載效率。
器件信息(1)
| 器件型號(hào) | 封裝 | 封裝尺寸（標(biāo)稱值） |
|---|---|---|
| TPS54623 | VQFN (14) | 3.50mm x 3.50mm |
- 如需了解所有可用封裝，請(qǐng)參閱產(chǎn)品說(shuō)明書末尾的可訂購(gòu)產(chǎn)品附錄。
效率與負(fù)載電流間的關(guān)系
4 修訂歷史記錄
Changes from B Revision (January 2017) to C Revision
- Added TI Design 頂部導(dǎo)航圖標(biāo)Go
- Added 頁(yè)面 1、應(yīng)用和實(shí)施以及器件和文檔支持部分中的 WEBENCH 鏈接Go
- 細(xì)微編輯變更Go
- Changed RθJA value from "47.2" to "40.1" Go
- Changed RθJCtop value from "64.8" to "34.4" Go
- RθJB value from "14.4" to "11.4" Go
- Changed ψJB value from "14.7" to "11.4" Go
- Changed RθJCbot value from "3.2" to "1.8" Go
- Added new paragraph to end of Sequencing (SS/TR) Go
Changes from A Revision (March 2016) to B Revision
- Changed Error amplifier dc gain test conditions, VSENSE from 0.8 V to 0.6 V Go
- Changed the voltage reference (Vref) from 0.8 V to 0.6 V in Slow Start (SS/TR) description. Go
- Changed "..internal voltage reference of 0.8 V. Above 0.8 V.." to "..internal voltage reference of 0.6 V. Above 0.6 V..." in Minimum Output Voltage description.Go
Changes from * Revision (September 2011) to A Revision