中国电子技术网

设为首页 网站地图 加入收藏

 

[原创] Linear LT8315高压微功耗无光耦隔离反激转换器解决方案

关键词:电源管理 反激转换器 DC/DC转换器

时间:2017-03-07 11:19:04       作者:Linear       来源:中电网

Linear公司的LT8315是集成了630V/300mA开关的高压反激转换器,不需要光隔离器,输入电压18V-560V,准谐振边界模式工作,恒流和恒压稳压,低静态电流70μA,可编程限流和软起动,主要用在隔离的通信,汽车和工业与医疗设备,隔离的离线家用电源,以及电动汽车和电池组.本文介绍了LT8315主要特性,框图,几种应用电路,以及演示板DC2337A主要特性,电路图,材料清单和PCB设计图.

The LTR8315 is a high voltage flyback converter with integrated630V/300mA switch. No opto-isolator is needed forregulation. The device samples the output voltage from the isolatedflyback waveform appearing across a third windingon the transformer. Quasi-resonant boundary modeoperation improves load regulation, reduces transformer size, and maintains high efficiency.

At start-up, the LT8315 charges its INTVCC capacitor via acurrent source attached to the DRAIN pin. During normaloperation, the current source turns off and the devicedraws its power from a third winding on the transformer.

The LT8315 operates from a wide range of input supplyvoltages and can deliver up to 15W of power. It is availablein a thermally enhanced 20-pin TSSOP package with fourpins removed for high-voltage spacing.

LT8315主要特性:

Wide Input Voltage Range: 18V to 560V
630V/300mA Integrated Power Switch
No Opto-Isolator Required for Regulation
Quasi-Resonant Boundary Mode Operation
Constant-Current and Constant-Voltage Regulation
Low-Ripple Light Load Burst ModeR Operation
Low Quiescent Current: 70μA
Programmable Current Limit and Soft-Start
TSSOP Package with High-Voltage Spacing

LT8315应用:

Isolated Telecom, Automotive, Industrial, MedicalPower Supplies
Isolated Off-Line Housekeeping Power Supplies
Electric Vehicles and Battery Stacks

图1.LT8315框图

图2.LT8315 12V高输入电压隔离反激转换器

图3.LT8315宽输入范围非隔离12V降压转换器

图4.LT8315效率83% 5V/1.5A隔离反激转换器

演示板DC2337A

Demonstration circuit 2337A is an offline isolated flybackconverter featuring LT®8315. The demo board outputs 12V,and maintains tight regulation with a load current from4mA to 0.55A. It is optimized to operate over a wide ACinput voltage range (90VAC to 265VAC, 47Hz to 63Hz).Output voltage accuracy stays within ±5% over the wholeinput voltage and load range.

The LT8315 is a high voltage flyback converter with integrated630V/300mA switch. No opto-isolator is needed forregulation. The part samples the output voltage from theisolated flyback waveform appearing across a third windingon the transformer. Quasi-resonant boundary modeoperation improves load regulation, reduces transformer

size, and maintains high efficiency. The LT8315 is availablein a thermally enhanced 20-pin TSSOP package with fourpins removed for high voltage spacing.

The LT8315 data sheet gives a complete description ofthe part, operation and application information. The datasheet must be read in conjunction with this quick startguide for demo circuit 2337A.

演示板DC2337A电性能指标:



图5.演示板DC2337A测试建立图

图6.演示板DC2337A电路图
演示板DC2337A材料清单:


图7.演示板DC2337A PCB设计图(1)

图8.演示板DC2337A PCB设计图(2)

图9.演示板DC2337A PCB设计图(3)
演示板DC2337A详细设计文件见:
演示板DC2337A设计文件.zip
详情请见:
http://cds.linear.com/docs/en/datasheet/8315f.pdf
http://cds.linear.com/docs/en/demo-board-manual/DC2337AF.PDF
以及http://cds.linear.com/docs/en/demo-board-schematic/DC2337A-3-SCH.PDF
8315f.pdf
DC2337A-3-SCH.PDF
DC2337AF.PDF

 

猜你喜欢