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| LMZ31710 10A DC－DC電源轉換解決方案 |
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| 文章來源： 更新時間：2015/2/28 13:33:00 |
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TI公司的LMZ31710是容易使用的10A SIMPLE SWITCHER電源模塊.采用10x10x4.3 mm QFN封裝,器件集成了功率MOSFET,屏蔽電感和無源元件,組成完整的10A DC/DC轉換器,效率高達95%,熱阻13.3℃/W.輸出電壓從0.6V到5.5V可調,可調開關頻率200 kHz到1.2 MHz,主要用在寬帶和通信設備,自動測試和醫療設備,DSP和FPGA點負載應用以及PCI / PCI Express / PXI Express.本文介紹了LMZ31710主要特性,框圖,應用電路,以及10A LMZ31710評估模塊(EVM)特性,電路圖,材料清單和PCB元件布局圖.
The LMZ31710 SIMPLE SWITCHER power module is an easy-to-use integrated power solution that combines a 10-A DC/DC converter with power MOSFETs, a shielded inductor, and passives into a low profile, QFN package. This total power solution allows as few as three external components and eliminates the loop compensation and magnetics part selection process.
The 10x10x4.3 mm QFN package is easy to solder onto a printed circuit board and allows a compact point-of-load design. Achieves greater than 95% efficiency and excellent power dissipation capability with a thermal impedance of 13.3°C/W. The LMZ31710 offers the flexibility and the feature-set of a discrete point-of-load design and is ideal for powering a wide range of ICs and systems. Advanced packaging technology affords a robust and reliable power solution compatible with standard QFN mounting and testing techniques.
LMZ31710主要特性:
Complete Integrated Power Solution Allows Small Footprint, Low-Profile Design
10mm x 10mm x 4.3mm Package
Pin Compatible with LMZ31707 & LMZ31704
Efficiencies Up to 95%
Eco-Mode / Light Load Efficiency (LLE)
Wide-Output Voltage Adjust 0.6 V to 5.5 V, with 1% Reference Accuracy
Supports Parallel Operation for Higher Current
Optional Split Power Rail allows Input Voltage Down to 2.95 V
Adjustable Switching Frequency (200 kHz to 1.2 MHz)
Synchronizes to an External Clock
Provides 180° Out-of-Phase Clock Signal
Adjustable Slow-Start
Output Voltage Sequencing / Tracking
Power Good Output
Programmable Undervoltage Lockout (UVLO)
Over-Current & Over-Temperature Protection
Pre-bias Output Start-up
Operating Temperature Range: –40℃ to 85℃
Enhanced Thermal Performance: 13.3℃/W
Meets EN55022 Class B Emissions
Integrated Shielded Inductor
LMZ31710應用:
• Broadband & Communications Infrastructure
• Automated Test and Medical Equipment
• Compact PCI / PCI Express / PXI Express
• DSP and FPGA Point-of-Load Applications
圖1. LMZ31710框圖
圖2. LMZ31710應用電路:PVIN = VIN = 4.5 V -17 V, VOUT = 3.3 V
圖3. LMZ31710并行應用電路圖
10A LMZ31710評估模塊(EVM)
This EVM features the LMZ31710 (10-A), LMZ31707 (7-A), or LMZ31704 (4-A), synchronous buck power module configured for operation with typical 5-V and 12-V input bus applications. The output voltage can be set to one of seven popular values by using a configuration jumper. In similar fashion, the switching frequency can be set to one of seven values with a jumper. The full output current rating of the device can be supplied by the EVM. Input and output capacitors are included on the board to accommodate the entire range of input and output voltages. Monitoring test points are provided to allow measurement of efficiency, power dissipation, input ripple, output ripple, line and load regulation, and transient response. Control test points are provided for use of the PWRGD, Inhibit/UVLO, synchronization, and slow-start/tracking features of the LMZ317xx device. The EVM uses a recommended PCB layout that maximizes thermal performance and minimizes output ripple and noise.
圖4.10A LMZ31710評估模塊(EVM)外形圖和用戶接口
圖5.10A LMZ31710評估模塊(EVM)電路圖
10A LMZ31710評估模塊(EVM)材料清單:
圖6.10A LMZ31710評估模塊(EVM)PCB元件布局圖(頂層)
圖7.10A LMZ31710評估模塊(EVM)PCB元件布局圖(底層) |
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