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21 Jul 2014

TPS43061

TI’s TPS43061 is a low IQ current-mode synchronous boost controller with wide input voltage range from 4.5V to 38V, boosted output range up to 58V, operates over an extended junction temperature range of -40 to 150°C and includes an integrated boot diode and a 5.5V gate-drive optimized to reduce switching loss with lower Qg NexFET™ technology.

TPS43061 – Small-Size, High-Efficiency, Low-lQ Synchronous Boost Controller - [Link]

8 Jun 2014

article-2014may-dcdc-converter-topologies-fig4

by Ashok Bindra:

Whether it is used for biasing avalanche photodiodes (APDs) found in optical receivers, driving photoflash tubes in flash cameras, or charging high-voltage capacitors, the need for high-voltage sources continues to grow. Consequently, in battery-powered units where the input supply voltage is low, step-up or boost DC/DC converters are required to generate voltages that can be several times the input. To address these requirements, suppliers such as Analog Devices, Linear Technology, Maxim Integrated, and Micrel Inc., among others, have produced boost converters with output voltages at 70 V and above.

This article examines such solutions and discusses the topologies and techniques used by each to boost output voltages by ratios of 10:1 or better in order to generate high-DC voltages from very-low DC inputs.

DC/DC Converter Topologies and Techniques to Obtain High Boost Ratios - [Link]

22 May 2014

article-2014may-dcdc-converter-topologies-fig1

By Ashok Bindra:

Whether it is used for biasing avalanche photodiodes (APDs) found in optical receivers, driving photoflash tubes in flash cameras, or charging high-voltage capacitors, the need for high-voltage sources continues to grow. Consequently, in battery-powered units where the input supply voltage is low, step-up or boost DC/DC converters are required to generate voltages that can be several times the input. To address these requirements, suppliers such as Analog Devices, Linear Technology, Maxim Integrated, and Micrel Inc., among others, have produced boost converters with output voltages at 70 V and above.

DC/DC Converter Topologies and Techniques to Obtain High Boost Ratios - [Link]

24 Apr 2013

article-2013april-buck-boost-converters-fig2

Publitek European Editors writes:

Many security and motion detector systems rely on small, semi-autonomous nodes that are easy and simple to install. This implies the use of a battery-based power source and low-power operation in order to minimize the number of battery changes during the lifetime of the product.

Over its lifetime, the output voltage of a battery falls, with the biggest decline when the charge is nearing full depletion. A converter type that can accommodate this change in voltage but can still provide relatively high voltages for sensors and RF transmitters is the buck-boost converter – it operates the buck part of the circuit when the battery is fresh, moving to boost operation when the voltage falls below the threshold of the electronic circuitry it powers. A number of vendors have developed integrated buck-boost converters optimized for battery systems

Buck-Boost Converters Help Extend Battery Life for Motion Detection - [Link]


16 Feb 2013

High_Efficiency_Battery_Boost_Regulator_20

Giorgos @ PCBheaven build a MCP1640 boost converter for the next LED light project. This converter can be used with almost dead batteries and will squeeze any remaining energy from them. [via]

What i want now, is something to spice up this hack. So here is what – I used the MCP1640 boost converter to drain the last electron from the batteries. This chip can work with a ridiculous low voltage and provide enough power to drive a couple LEDs. Which means the 2 AA batteries will operate even longer and the LEDs will be much brighter.

High efficiency battery boost regulator using the MCP1640 - [Link]

8 Sep 2012

Tamara Schmitz writes:

Combining the operation of a boost regulator and a negative voltage converter can generate a negative supply from a single low-voltage supply. The circuit in Figure 1 shows a standard application circuit for a +20 V supply along with two op amps, two diodes and two capacitors to generate the – 20 V supply. This article will discuss the basic operation of a boost converter to generate a larger positive supply voltage. Equations are derived to determine the minimum inductor value to maintain a safe peak inductor current, and a maximum inductor value to maintain continuous conduction mode (CCM) operation. The article will then discuss the generation of a negative supply and the restrictions of the design.

Simple Circuit to Generate Plus and Minus Supplies Using a Boost Regulator - [Link]

5 Sep 2012

Current controlled boost LED driver and black soldermasks @ Limpkin’s blog – [via]

[Here's] all you need to know to design your own LED driver based on the MAX16834 and also give you the design spreadsheets that are quite long to get.

Current controlled boost LED driver and black soldermasks - [Link]

2 Aug 2012

A Switch Mode Power Supply circuit collection from Linear Technology. It covers 12 basic SMPS circuit categories: Battery, Boost, Buck, Buck-Boost, Flyback, Forward, High Voltage, Multioutput, Off Line, Preregulator, Switched Capacitor and Telecom. [via]

Switching regulator circuit collection - [Link]

29 Jun 2012

Maxim shows how to build a 112 watt DC-DC boost driver for long strings of LEDs. The driver is current controlled,with adjustable output from 0 to 1.5Amps. [via]

This reference design is for a high-voltage boost current source for very long strings of LEDs. Applications that use long LED strings include, but are not limited to, streetlights and parking garage lights. Long LED strings can be a very cost-effective way to drive LEDs. Also, since the LEDs will have exactly the same current, brightness variations are nicely controlled. This design has a 24V input, up to a 75V LED output, and drives 1.5A through the LED string (or strings, if paralleled). The measured input power is 115.49W and the output power is 111.6W for an efficiency of about 96.6%.

112W Boost driver for long strings of LEDs - [Link]

11 Feb 2012

dangerousprototypes.com writes:

Here is a part from National Semiconductor designed for controlling high-power DC/DC boost regulators. What makes it interesting is that its PWM frequency can be pushed to 2Mhz. This allows for smaller and cheaper discrete components, like inductors and capacitors. The datasheet on this device also provides some nice PCB guidelines to maximize its efficiency and minimize noise.

App note: LM5022 DC/DC boost controller - [Link]



 
 
 

 

 

 

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