TI公司的LM604x0系列是3.8V-36V 3A和4A超小型同步降壓DC/DC轉(zhuǎn)換器.該器件容易使用,為工業(yè)應(yīng)用提供業(yè)界最好的效率.LM60430提供多達3A負載電流,而LM60440則是業(yè)界最小的4A降壓轉(zhuǎn)換器.器件具有低EMI和開關(guān)噪音,滿足CISPR22 class 5標準,開關(guān)頻率400kHz和1MHz,輸出電壓從1V到24V,所有負載下的功率轉(zhuǎn)換高效率,峰值效率大于95%,10-mA, 12 VIN, 5 VOUT時的PFM效率為90%.工作結(jié)溫–40C 到 +150C.工作靜態(tài)電流25 μA.主要用在工業(yè)PC和CPU(PLC控制器),伺服驅(qū)動和AC驅(qū)動控制模塊和醫(yī)療與儀表應(yīng)用.本文介紹了LM604x0系列主要特性,功能框圖,應(yīng)用電路以及評估模塊LM60440AQEVM主要特性,電路圖,材料清單和PCB設(shè)計圖.
The LM604x0 regulator is an easy-to-use,synchronous, step-down DC/DC converter that
delivers best-in-class efficiency for rugged industrialapplications. The LM60430 drives up to 3-A of loadcurrent, and the LM60440 is industrys smallest 4Astep-down converter.
The LM604x0 is available in an ultra-miniature WQFNpackage with wettable flanks and a standard QFNpin-out with a thermal pad to enhance thermalperformance. This enhanced QFN package featuresextremely small parasitic inductance and resistance,
enabling very high efficiency while minimizing switchnode ringing and dramatically reducing EMI.
The LM604x0 uses peak-current-mode control toautomatically fold back frequency at light load toensure exceptional efficiency across the entire loadrange. The low power dissipation paired with athermally optimized QFN package enables a powerdense solution size. In addition the device requiresfew external components and has a pinout designedfor simple PCB layout. The small solution size andfeature set of the LM604x0 are designed to simplifyimplementation for a wide range of end equipment.
This device is also available in an AEC-Q100-qualified version.
LM604x0系列主要特性:
1• Functional Safety-Capable
– Documentation available to aid functionalsafety system design
• Low EMI and switching noise
– Meets CISPR22 class 5 standard
– Enhanced QFN package minimizes parasiticinductance and switch node ringing
• Configured for rugged industrial applications
– Standard QFN footprint: single large thermalpad and all pins accessible from perimeter
– Pin compatible variants:
– LM60440 (36 V, 4 A)
– LM60430 (36 V, 3 A)
– Junction temperature range –40C to +150C
– Frequency: 400 kHz, 1 MHz
– Output voltage range: 1 V to 24 V
• High efficiency power conversion at all loads
– Peak efficiency > 95%
– 90% PFM efficiency at 10-mA, 12 VIN, 5 VOUT
– Low operating quiescent current of 25 μA
• Create a custom design using the LM60440 withthe WEBENCH® Power Designer
LM604x0系列應(yīng)用:
• Industrial PC and CPU (PLC controller)
• Servo drive and AC drive control module
• Medical and instrumentation applications
圖1.LM604x0系列功能框圖
圖2. LM604x0系列應(yīng)用案例圖(400kHz)
評估模塊LM60440AQEVM
The Texas Instruments LM60440AQEVM evaluation module helps designers evaluate the operation andperformance of the LM60440-Q1 wide-input buck converters. The LM60440-Q1 is an easy-to-usesynchronous step-down DC/DC converter capable of driving up to 4.0 A of load current from an inputvoltage of up to 36 V. The LM60440AQEVM features an adjustable output voltage of 5 V and a switchingfrequency of 400 kHz. See the LMR60440-Q1 3.8-V to 36-V, 4-A Synchronous Step-down Voltage
Converter Data Sheet data sheets for additional features, detailed descriptions, and available options.
圖3.評估模塊LM60440AQEVM外形圖
圖4.評估模塊LM60440AQEVM電路圖
評估模塊LM60440AQEVM材料清單:
圖5.評估模塊LM60440AQEVM PCB設(shè)計圖:頂層
圖6.評估模塊LM60440AQEVM PCB設(shè)計圖:底層
圖7.評估模塊LM60440AQEVM PCB設(shè)計圖:頂層銅
圖8.評估模塊LM60440AQEVM PCB設(shè)計圖:中間層1
圖9.評估模塊LM60440AQEVM PCB設(shè)計圖:中間層2
圖10.評估模塊LM60440AQEVM PCB設(shè)計圖:底層銅 |
