Linear公司的LTM4607是高效(高達98%)開關模式降-升壓模式電源,集成了開關控制器,功率FET和支持的元件,輸入電壓4.5V到36V,輸出電壓0.8V到24V由外接電阻設定.升壓模式輸出電流高達5A,降壓模式輸出電流高達10A,主要用在通信,服務器和網絡設備,工業和自動化設備,大功率以電池為能源的設備.本文介紹了LTM4607主要特性,框圖,多種應用電路以及演示板DC1601B主要特性,電路圖以及材料清單.
The LTM.4607 is a high efficiency switching mode buckboost power supply. Included in the package are the switching controller, power FETs, and support components.
Operating over an input voltage range of 4.5V to 36V, the LTM4607 supports an output voltage range of 0.8V to 24V, set by a resistor. This high efficiency design delivers up to 5A continuous current in boost mode (10A in buck mode). Only the inductor, sense resistor, bulk input and output capacitors are needed to finish the design.
The low profile package enables utilization of unused space on the bottom of PC boards for high density point of load regulation. The high switching frequency and current mode architecture enable a very fast transient response to line and load changes without sacrificing stability. The LTM4607 can be frequency synchronized with an external clock to reduce undesirable frequency harmonics.
Fault protection features include overvoltage and foldback current protection. The DC/DC μModule. regulator is offered in a small thermally enhanced 15mmx15mmx2.8mm LGA package. The LTM4607 is Pb-free and RoHS compliant.
LTM4607主要特性:
Single Inductor Architecture Allows VIN Above, Below or Equal to VOUT
Wide VIN Range: 4.5V to 36V
Wide VOUT Range: 0.8V to 24V
5A DC (10A DC in Buck Mode)
High Efficiency Up to 98%
Current Mode Control
Power Good Output Signal
Phase-Lockable Fixed Frequency: 200kHz to 400kHz
Ultrafast Transient Response
Current Foldback Protection
Output Overvoltage Protection
Small, Low Profile Surface Mount LGA Package (15mm x15mmx2.8mm)
LTM4607應用:
Telecom, Servers and Networking Equipment
Industrial and Automotive Equipment
High Power Battery-Operated Devices
圖1.LTM4607簡化框圖
圖2.LTM4607輸入12V-36V降壓模式應用電路
圖3.LTM4607輸入5V-12V升壓模式低開關噪音應用電路
圖4.LTM4607輸入5V-36V輸出12V/5A寬輸入模式應用電路
圖5.LTM4607 5V/10A設計電路
圖6.LTM4607兩相并聯12V/10A設計電路
圖7.LTM4607降壓模式正到負-12V輸出設計電路
演示板DC1601B
Demonstration circuit DC1601B is a PolyPhase. power supply featuring the LTM.4607 power module, a complete high efficiency switching mode buck-boost power supply.
The DC1601B input voltage range is from 6V to 36V and is capable of delivering high power through paralleled LTM4607 modules. The demo circuit can deliver up to 10A of output current for two paralleled modules (DC1601B-A), 15A for three paralleled modules (DC1601B-B) and up to 20A for four paralleled modules (DC1601B-C). The DC1601B demonstrates that paralleling modules is easy and reliable.
The output voltage for the board is 12V. The rated load current per module is 5A in boost mode, however current derating may be necessary under certain VIN, VOUT, frequency, and thermal conditions. An onboard external clock is provided for synchronization and interleaving of L, LT, LTC, LTM, Linear Technology, PolyPhase and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
phases to minimize input and output ripple. An internal phase-locked loop allows the LTM4607 to be synchronized to an external clock within the range of 200kHz to 400kHz. The LTM4607 default switching frequency on the DC1601B is set to 300kHz through the onboard LTC6902 clock generator which interleaves the paralleled phases.
The frequency and phase separation set by the LTC6902 are resistor programmable.
These features,including the availability of the LTM4607 in a compact thermally enhanced 15mmx15mmx2.8mm LGA package make the demonstration circuit ideal for use in high density point of load regulation applications.
圖8. 演示板DC1601B外形圖
演示板DC1601B性能指標(TA = 25℃):
圖9. 演示板DC1601B電路圖(1)
圖10. 演示板DC1601B電路圖(2)
圖11. 演示板DC1601B電路圖(3)
演示板DC1601B材料清單:
演示板1601B-A材料清單:
演示板1601B-B材料清單:
演示板1601B-C材料清單:
|
