外文翻译

河北科技师范学院

本科毕业论文（设计）外文翻译 LTC3105-DC/DC转换器

院（系、部）名称：机电科学与工程系

专业名称：电气工程及其自动化

学生姓名：陈莹

学生学号：9310080219

指导教师：杜殿会

2012年4月7日

河北科技师范学院教务处制

LTC3105 - 400mA Step-Up DC/DC Converter with Maximum Power Point Control and 250mV Start-Up

1.Overview

1.1 Features

●Low Start-Up V oltage: 250mV

●Maximum Power Point Control

●Wide VIN Range: 225mV to 5V

●Auxiliary 6mA LDO Regulator

●Burst Mode® Operation: IQ = 24μA

●Output Disconnect and Inrush Current Limiting

●VIN > VOUT Operation

●Antringing Control

●Soft Start

●Automatic Power Adjust

●Power Good Indicator

●10-Lead 3mm × 3mm × 0.75mm DFN and 12-Lead MSOP Packages

1.2 Typical Application

1.3 Description

The LTC3105 is a high efficiency step-up DC/DC converter that can operate

from input voltages as low as 225mV. A 250mV start-up capability and integrated maximum power point controller (MPPC) enable operation directly from low voltage, high impedance alternative power sources such as photovoltaic cells, TEGs (thermoelectric generators) and fuel cells. A user programmable MPPC set point maximizes the energy that can be extracted from any power source. Burst Mode operation, with a proprietary self adjusting peak current, optimizes converter efficiency and output voltage ripple over all operating conditions.

The AUX powered 6mA LDO provides a regulated rail for external microcontrollers and sensors while the main output is charging. In shutdown, IQ is reduced to 10μA and integrated thermal shutdown offers protection from overtemperature faults. The LTC3105 is offered in 10-lead 3mm ×3mm ×0.75mm DFN and 12-lead MSOP packages.

1.4Applications

Solar Powered Battery/Supercapacitor Chargers

Energy Harvesting

Remote Industrial Sensors

Low Power Wireless Transmitters

Cell Phone, MP3, PMP and GPS Accessory Chargers

2. Packaging

For complete and up to date package information and drawings, please refer to our packaging page

DFN-10, MS-12

3. Simulate

LTspice IV is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. To download LTspice IV and other FREE simulation tools, please visit our Design Simulation page.

To launch a ready to run LTspice demonstration circuit for this part:

Step 1:If you have not installed LTspice on this computer, download and install LTspice IV

Step 2:Once LTspice is installed, click on the link(s) below to launch the simulation

LTC3105 Demo Circuit - 400mA Step-Up Converter with PV Source Temp Tracking (0.6-1V to 3.3V @ 10mA & 2.2V @ 6mA)

Step 3:If LTspice IV does not automatically open after clicking the link above, you can instead run the simulation by right clicking on the link and selecting "Save Target As". After saving the file to your computer, start LTspice and open the demonstration circuit by selecting 'Open' from the 'File' menu

To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.

4. Circuits

4.1 2-Cell Solar Panel Li-Ion Battery Charger

This circuit shows a compact solar-powered battery charger using a LTC3105 as a boost converter and a LTC4071 as Li-Ion shunt charger. A 2-cell 400mW solar panel provides the input power to the LTC3105 to produce over 60mA of charge current in full sunlight. Maximum power point control prevents the solar panel voltage from