Tag Archives: converter

Linear applies switched-capacitor step-down topology for inductor-less DC/DC

Graham Prophet @ eedesignnewseurope.com discuss about the new Linear’s step-down inductor-less controller.
LTC7820 is, a high power fixed ratio charge pump DC/DC controller that eliminates the power inductor in a non-isolated intermediate bus converter, allowing up to a 50% reduction in circuit size and up to 4000 W/in³ power density. The 72V fixed-ratio DC/DC controller can deliver 500W. – See more at: http://www.eedesignnewseurope.com/news/linear-applies-switched-capacitor-step-down-topology-inductor-less-dcdc#sthash.pJcu7NoB.dpuf

5V to 12V @400mA Boost Converter

The circuit presented here is about a boost converter based on LM2698. It is a PWM boost converter from Texas instruments. LM2698 can also be used as a flyback converter. The current mode architecture is a special feature of LM2698, which provides superior line and load regulation. This circuit is capable of a supplying a output voltage of 12V for a input range of 4.5V to 5.5V.

Specifications

  • Input voltage: 4.5VDC to 5.5VDC
  • Output voltage: 12VDC
  • Output current: 0.4A
  • PCB:45mm X 30mm

5V to 12V @400mA Boost Converter – [Link]

CMOS-TTL QUADRATURE ENCODER USING LS7084

The quadrature LS7084 Module is a CMOS quadrature clock converter. Quadrature clocks derived from optical or magnetic encoders, when applied to the A and B inputs of the LS7084 are converted to strings of a Clock and an Up/down direction control. These outputs can be interfaced directly with standard Up/Down counters for direction and position sensing of the encoder.

Features

  • Supply 5V DC
  • +4.5V to +10V operation (VDD – VSS)
  • On Board Power LED
  • J1 Encoder pulse multiplication ( Jumper JL Close =1X, Jumper JH Close = X4)
  • Header Connector for Encoder Interface
  • X1 and X4 mode selection
  • Programmable output clock pulse width
  • On-chip filtering of inputs for optical or magnetic encoder applications.
  • TTL and CMOS compatible I/Os
  • Up to 16MHz output clock frequency

CMOS-TTL QUADRATURE ENCODER USING LS7084 – [Link]

Step Up DC-DC Converter – 12V TO 28V DC 175mA

The Step-Up DC-DC Converter project provides 28V, 175mA output with input of 12V DC. The MC34063A IC is heart of the project from On semiconductor. The MC33063A is a monolithic control circuit containing the primary functions required for DC-DC converters. This device consist of an internal temperature compensated reference, comparator, controlled duty cycle oscillator with an active current limit circuit, driver and high current output switch. This IC specially designed to be incorporated step-down, step-up, and voltage-inverting applications with minimum number of external components.

Features

  • Input 12V DC
  • Output 28V, 175mA
  • Output Voltage  Adjustable By On-board Preset
  • Header Connector for Output/Input Connections
  • Low Standby Current

Step Up DC-DC Converter – 12V TO 28V DC 175mA – [Link]

LT8335 – Converter minimizes quiescent current

lt8335col_1

Outfitted with a 2-A, 28-V power switch, the LT8335 2-MHz step-up DC/DC converter from Linear Technology operates from an input of 3 V to 25 V, suitable for applications with input sources ranging from a single-cell lithium-ion battery to automotive inputs.

The LT®8335 is a current mode DC/DC converter capable of generating either positive or negative output voltages using a single feedback pin. It can be configured as a boost, SEPIC or inverting converter consuming as low as 6μA of quiescent current. Low ripple Burst Mode operation maintains high efficiency down to very low output currents while keeping the output ripple below 15mV in a typical application. The internally compensated current mode architecture results in stable operation over a wide range of input and output voltages. Integrated soft-start and frequency foldback functions are included to control inductor current during start-up. The 2MHz operation combined with the small 8-lead DFN package, enables low cost, area efficient solutions.

LT8335 – Converter minimizes quiescent current – [Link]

Build an Arduino boost converter

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Lucas Reed has a tutorial on how to build a boost converter using an Arduino.

Have you ever needed to power a project that’s not near an outlet? Have you needed to test using different voltages? Are you curious about analog circuits and power? Using Autodesk Circuits and a lead-acid battery, you can create a circuit that will act as a variable power supply, outputting a range of voltages from 5V to 20V.

Build an Arduino boost converter – [Link]

USB to RS485 converter

pcb-assembled

Marko Pavlin has published a USB to RS485 converter. He writes:

Testing of sensors with RS485 using PC without proper interface is not possible. Since RS232 interfaces are very rare, the interface should be hooked to USB. The interface between USB and RS485 can be soldered with one of the many FTDI interfaces with added RS485 driver, or bought as assembled module. There is always the third option. I made it from scratch.

USB to RS485 converter – [Link]

ATtiny85 Boost Converter

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GreatScottLab @ instructables.com build a step up dc-dc converter with the help of ATtiny85 microcontroller.

In this project I will show you an efficient and common way how to step up DC voltages. I will also demonstrate how easy it can be to build a boost converter with the help of an ATtiny85. Let’s get started!

ATtiny85 Boost Converter – [Link]

12V to 28V Step Up DC-DC Converter

12V-to-28V-StepUp-Converter-G054

The Step-Up DC-DC Converter project provides 28V, 175mA output with input of 12V DC. The MC34063A IC is heart of the project from On semiconductor. The MC33063A is a monolithic control circuit containing the primary functions required for DC-DC converters, This device consist of an internal temperature compensated reference, comparator, controlled duty cycle oscillator with an active current limit circuit, driver and high current output switch. This IC specially designed to be incorporated step-down, step-up, and voltage-inverting applications with minimum number of external components.

Features

  • Input 12V DC
  • Output 28V, 175mA
  • Output Fine Adjustable By On-board Preset
  • Header Connector for Output/Input Connections
  • Low Standby Current
  • On Board Filter To Provide Low Ripple Output
  • PCB Dimensions 28mmX33MM

12V to 28V Step Up DC-DC Converter – [Link]

Dual USB Serial and I2C Converter

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Jesus Echavarria has posted a new project, a dual USB – Serial and I2C converter to communicate with serial and I2C devices.

Hi all! After a couple of months with a lot of work, I come here again with the last board I develop before Christmas. It’s a dual USB serial and I2C converter based on two MCP2221 Microchip 2.0 USB-Serial bridges. I develop it as a need on my work with the last project I’m involved. I need to monitor a serial communication between two devices. With only one converter, I must choose between RX and TX lines to monitoring the traffic.

Dual USB Serial and I2C Converter – [Link]