[原創] TI LMR33630SIMPLE SWITCHER高效穩壓器解決方案

TI公司的LMR33630是SIMPLE SWITCHER®穩壓器,提供最好效率容易使用的降壓DC/DC轉換器,輸入電壓高達36V,負載電流高達3A,能在解決方案非常小尺寸提供輕負載高效率(峰效率大于95%)和輸出高精度,輸入電壓3.8V-36V,輸出電壓1V-24V,集成了75 mΩ/50 mΩRDS-ON功率MOSFET,峰值電流模式控制,開關頻率400 kHz,1.4 MHz和2.1 MHz,主要用在馬達驅動系統如無人機,AC逆變器,VF驅動和伺服系統,工廠和建筑物自動化系統如PLC CPU,HVAC控制,電梯控制以及通用寬VIN電源.本文介紹了LMR33630主要特性,功能框圖和應用電路,以及評估模塊LMR33630 EVM主要特性,電路圖,材料清單和PCB設計圖.

The LMR33630 SIMPLE SWITCHER® regulator is aneasy-to-use, synchronous, step-down DC/DCconverter that delivers best-in-class efficiency forrugged industrial applications. The LMR33630 iscapable of driving up to 3 A of load current from aninput of up to 36 V. The LMR33630 provides highlight load efficiency and output accuracy in a verysmall solution size. Features such as a power-goodflag and precision enable provide both flexible andeasy-to-use solutions for a wide range of applications.

The LMR33630 automatically folds back frequency atlight load to improve efficiency. Integration eliminatesmost external components and provides a pinoutdesigned for simple PCB layout. Protection featuresinclude thermal shutdown, input undervoltage lockout,cycle-by-cycle current limit, and hiccup short-circuitprotection. The LMR33630 is available in an 8-pinHSOIC package and in a 12-pin 3 mm × 2 mm VQFNpackage with wettable flanks. This device is alsoavailable in an AEC-Q100-qualified version.Thisdevice is also availabe in an AEC-Q100 qualifiedversion.

LMR33630主要特性:

1• Configured for Rugged Industrial Applications
– Input Voltage Range: 3.8 V to 36 V
– Output Voltage Range: 1 V to 24 V
– Output Current: 3 A
– 75 mΩ/50 mΩ RDS-ON Power MOSFETs
– Peak-Current-Mode Control
– Short Minimum On-Time of 68 ns
– Frequency: 400 kHz, 1.4 MHz, 2.1 MHz
– Junction Temperature Range –40℃ to+125℃
– Low EMI and Low Switching Noise
– Integrated Compensation Network
• High Efficiency Solution
– Peak Efficiency > 95%
– Low Shutdown Quiescent Current of 5 μA
– Low Operating Quiescent Current of 25 μA
• Flexible System Interface
– Power-Good Flag and Precision Enable
• Create a Custom Design Using the LMR33630with the WEBENCH® Power Designer

LMR33630應用:

• Motor Drive Systems: Drones, AC Inverters,VF Drives, Servos
• Factory and Building Automation Systems:PLC CPU, HVAC Control, Elevator Control
• General Purpose Wide VIN Power Supplies

圖1.LMR33630功能框圖

圖2.LMR33630應用電路(400kHz)

評估模塊LMR33630 EVM

The Texas Instruments LMR33630 EVM evaluation module (EVM) helps designers evaluate the operationand performance of the LMR33630 buck regulator. The LMR336x0 is a family of easy-to-use synchronousstep-down DC/DC converters capable of driving up to 3 A of load current from an input voltage of 3.8 V to36 V. The LMR33630 EVM features a selectable output voltage of 3.3 V or 5 V and a switching frequencyof either 400 kHz or 2.1 MHz. See the LMR33630 data sheet for additional features, detailed description,and available options.

圖3.評估模塊LMR33630 EVM外形圖(頂視圖)