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[原创] Linear LTC3897PolyPhase同步升压转换器解决方案

关键词:电源管理 DC/DC转换器 LTC3897

时间:2017-02-10 09:38:31       作者:Linear       来源:中电网

Linear公司的LTC3897是带输入/输出保护的PolyPhase™同步升压转换器,能驱动两个N沟功率MOSFET级,输入电压4.5V-65V(高达75V浪涌),输出高达65V,主要用在工业,汽车和军事/航空航天.本文介绍了LTC3897主要特性,框图和十多种应用电路,以及演示板DC2108主要特性,电路图和材料清单.

The LTC.3897 is a synchronous boost DC/DC controller with surge stopper and ideal diode controller. The boost controller drives two N-channel power MOSFET stages out-of-phase to reduce input and output capacitor requirements, allowing the use of smaller inductors than the single-phase equivalent. Synchronous rectification reduces power loss and eases thermal requirements.

The surge stopper controls the gate of an external N-channel MOSFET to protect against high voltage input transients and provides in-rush current control, overcurrent protection and output disconnect for the boost converter. The integrated ideal diode controller drives another N-channel MOSFET to replace a Schottky diode for reverse input protection and
voltage holdup or peak detection. It controls the forward voltage drop across the MOSFET and minimizes reverse current flow.

The LTC3897 is available in thermally-enhanced 38-pin leadless QFN or 38-lead TSSOP packages.

LTC3897主要特性:

nn Input Supply Range: 4.5V to 65V (Up to 75V Surge)
nn Reverse Input Protection to –40V
nn In-Rush Current Control, Overcurrent Protection and Output Disconnect for Boost Converter
nn Input Voltage Surge Protection with Adjustable Clamp Voltage
nn Onboard Ideal Diode Controller
nn Low Quiescent Current: 55μA
nn 2-Phase Operation Reduces Required Input and Output Capacitance and Noise
nn Output Voltage Up to 60V
nn Adjustable Gate Drive Level 5V to 10V (OPTI-DRIVE) for Logic-Level or Standard Threshold FETs
nn No External Bootstrap Diodes Required

LTC3897应用:

nn Industrial
nn Automotive
nn Military/Avionics

图1. LTC3897框图

图2. LTC3897应用电路图(1):24V/10A 2相同步升压转换器

图3. LTC3897应用电路图(2):3相工作

图4. LTC3897应用电路图(3):4相工作

图5. LTC3897应用电路图(4):6相工作

图6. LTC3897应用电路图(5):12相工作

图7. LTC3897应用电路图(6):高效2相48V升压转换器(1)

图8. LTC3897应用电路图(7):高效2相48V升压转换器(2)

图9. LTC3897应用电路图(8):高效2相24V升压转换器

图10. LTC3897应用电路图(9):高效2相48V升压转换器(3)

图11. LTC3897应用电路图(10):高效2相48V升压转换器(4)

图12. LTC3897应用电路图(11):高效2相48V升压转换器(5)

图13. LTC3897应用电路图(12):非同步107V/1.5A 2相48V升压转换器
演示板DC2108
Demonstration circuit DC2108 is DC/DC boost converter featuring the LTCR3897 constant frequency current mode boost controller. The DC2108A operates over a 16V to
55V input and provides 4A to 12A of output current. The 160kHz (2 •160kHz at the output) constant frequency operation results in a small and efficient circuit. The converter provides high output voltage accuracy (typically ±3%) over a wide load range with no minimum load requirement. The demonstration circuit can be easily modified to generate different output voltages.
The DC2108 has small circuit footprint. It is a high performance and cost effective solution for Telecom, Automotive and Power Over Ethernet applications.

图14. 演示板DC2108测量建立图

图15. 演示板DC2108电路图

演示板DC2108材料清单:


详情请见:
http://cds.linear.com/docs/en/datasheet/3897f.pdf

http://cds.linear.com/docs/en/demo-board-manual/DC2108AF.PDF
以及
http://cds.linear.com/docs/en/demo-board-schematic/DC2108A-2-SCH.PDF

3897f.pdf

DC2108A-2-SCH.PDF

DC2108AF.PDF

 

 

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