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[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 integrated 630V/300mA switch. No opto-isolator is needed for regulation. The device samples the output voltage from the
isolated flyback waveform appearing across a third winding on the transformer. Quasi-resonant boundary mode operation improves load regulation, reduces transformer
size, and maintains high efficiency.

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

The LT8315 operates from a wide range of input supply voltages and can deliver up to 15W of power. It is available in a thermally enhanced 20-pin TSSOP package with four pins removed for high-voltage spacing.

LT8315主要特性:

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

LT8315应用:

nn Isolated Telecom, Automotive, Industrial, Medical Power Supplies
nn Isolated Off-Line Housekeeping Power Supplies
nn 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 flyback converter featuring LT®8315. The demo board outputs 12V, and maintains tight regulation with a load current from 4mA to 0.55A. It is optimized to operate over a wide AC input voltage range (90VAC to 265VAC, 47Hz to 63Hz).

Output voltage accuracy stays within ±5% over the whole input voltage and load range.
The LT8315 is a high voltage flyback converter with integrated 630V/300mA switch. No opto-isolator is needed for regulation. The part samples the output voltage from the isolated flyback waveform appearing across a third winding on the transformer. Quasi-resonant boundary mode operation improves load regulation, reduces transformer
size, and maintains high efficiency. The LT8315 is available in a thermally enhanced 20-pin TSSOP package with four pins removed for high voltage spacing.

The LT8315 data sheet gives a complete description of the part, operation and application information. The data sheet must be read in conjunction with this quick start guide 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:

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

演示板DC2337A设计文件.zip

 

 

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