TI公司的TPS51397A是單片4.5V-24V 10A帶ULQ™操作的同步降壓轉(zhuǎn)換器,集成的MOSFET具有高效率和容易使用,外接元件數(shù)量最少,從而節(jié)省了電源系統(tǒng)的空間. TPS51397A采用D-CAP3™控制,提供內(nèi)部補(bǔ)償?shù)淖羁斓乃矐B(tài)響應(yīng)和極好的線路和負(fù)載調(diào)整.ULQ™ (超低靜態(tài)電流)在低功耗工作中延成電池壽命有極大的好處.器件的輸入電壓為4.5V到24V,輸出電壓為0.6V到5.5V,支持10A連續(xù)電流輸出,0.6 V ± 1%反饋精度(25C).集成的17-mΩ和5.9-mΩ FET,通過(guò)MODE引腳可選擇Eco-mode™和Out-of-Audio™,500kHz和800kHz可選擇開(kāi)關(guān)頻率,可選擇軟起動(dòng)時(shí)間,默認(rèn)間隔1.2ms,大占空比操作,集成了功率良好指示器,內(nèi)置輸出放電功能,逐個(gè)周期的過(guò)流保護(hù),閉鎖輸出OV和UV保護(hù),非閉鎖UVLO和OT保護(hù),工作結(jié)溫度-40C 到125C,23引腳3.0x3.0 mm HotRod™ VQFN封裝.主要用在筆記本和PC電腦,超級(jí)本,手持平板計(jì)算機(jī),工業(yè)PC<單板計(jì)算機(jī)和分布電源系統(tǒng).本文介紹了TPS51397A主要特性,功能框圖, 5V 10A參考設(shè)計(jì)電路圖及其參考設(shè)計(jì)主要參數(shù),以及評(píng)估模塊TPS51397AEVM主要特性,電路圖,材料清單和PCB設(shè)計(jì)圖.
The device is a monolithic 10-A synchronous buckconverter with integrated MOSFETs that enable highefficiency and offers ease-of-use with minimumexternal component count for space-conscious powersystems.
The TPS51397A employs D-CAP3™ control thatprovides fast transient response and excellent lineand load regulation with internal compensation. TheULQ™ (Ultra Low Quiescent) feature is extremelybeneficial for long battery life in low power operation.
The large duty operation greatly improves the loadtransient performance when input voltage is low.
The MODE pin can be used to set Eco-mode™ orOut-of-Audio™ (OOA) mode for light-load operationand 500-kHz or 800-kHz switching frequency. TheEco-mode™ maintains high efficiency during light loadoperation. The OOA mode keeps the switching
frequency above audible frequency with minimumreduction in efficiency.
The device supports both internal and external softstartoptions. It has an internal fixed soft-start time of1.2 ms.If the application needs a longer soft-starttime, the external SS pin can be connected to anexternal capacitor.
The TPS51397A integrates a power-good indicatorand provides an output discharge function. It providescomplete protection including OVP, UVP, OCP, OTP,and UVLO. The device is available in a 20-pin 3.0-mmx 3.0-mm HotRod™ package and the junction
temperature is specified from –40C to 125C.
TPS51397A主要特性:
• Input voltage range: 4.5 V to 24 V
• Output voltage range: 0.6 V to 5.5 V
• Supports 10-A continuous output current
• D-CAP3™ architecture control for fast transientresponse
• 0.6 V ± 1% feedback voltage accuracy (25C)
• Integrated 17-mΩ and 5.9-mΩ FETs
• ULQ™ operation (110 μA) to enable long batterylife during system standby
• Selectable Eco-mode™ and Out-of-Audio™ byMODE pin
• 500-kHz and 800-kHz selectable switchingfrequency
• Adjustable soft-start time with default internal 1.2ms
• Large duty cycle operation
• Integrated power-good indicator
• Built-in output discharge function
• Cycle-by-cycle overcurrent protection
• Latched output OV and UV protections
• Non-latched UVLO and OT protections
• -40C to 125C Operating junction temperature
• 20-pin 3.0-mm × 3.0-mm HotRod™ VQFN package
• Pin-to-pin compatible with 12-A TPS56C230
• Create a custom design using the TPS51397Awith the WEBENCH® Power Designer
TPS51397A應(yīng)用:
• Notebook and PC computers
• Ultrabook, handheld tablet computers
• Industrial PC, single-board computers
• Non-military drone
• Distributed power systems
圖1.TPS51397A功能框圖
圖2. TPS51397A 5V 10A參考設(shè)計(jì)電路圖
參考設(shè)計(jì)主要參數(shù):
評(píng)估模塊TPS51397AEVM
This users guide contains information for the TPS51397A evaluation module (EVM) as well as for theTPS51397A DC/DC converter. Also included are the performance specifications, schematic, layout and, the billof materials for the TPS51397AEVM.
圖3.評(píng)估模塊TPS51397AEVM外形圖(正面)
圖4.評(píng)估模塊TPS51397AEVM外形圖(背面)
圖5.評(píng)估模塊TPS51397AEVM電路圖
評(píng)估模塊TPS51397AEVM材料清單:
圖6.評(píng)估模塊TPS51397AEVM PCB設(shè)計(jì)圖(1):頂層裝配
圖7.評(píng)估模塊TPS51397AEVM PCB設(shè)計(jì)圖(2):頂層
圖8.評(píng)估模塊TPS51397AEVM PCB設(shè)計(jì)圖(3):層1
圖9.評(píng)估模塊TPS51397AEVM PCB設(shè)計(jì)圖(4):層2
圖10.評(píng)估模塊TPS51397AEVM PCB設(shè)計(jì)圖(5):底層 |
