Tag Archives: DC-DC

LM2596 DC-DC Converter Module Testing


by Kerry D. Wong:

LM2596 based step-down DC-DC converter modules can be bought on eBay quite cheaply for around a dollar each. But how do they perform? Is it safe to use it to power your design? Let’s find out.

According to TI’s website, these LM2596 step-down (buck) regulators are sold for $1.8 each for a quantity of a thousand. So how a finished converter could be sold for just above a dollar each is quite a mystery to me. Anyway, the picture below is the board I received. It appears that there are a few variations to this design (slightly different inductor size or capacitor size/voltage rating, etc.) but they all are largely based on the reference design.

LM2596 DC-DC Converter Module Testing – [Link]

Buck converter is pin-programmable


by Susan Nordyk @ edn.com:

Housed in a tiny 3×3-mm QFN package, the MIC24046-H synchronous step-down regulator from Micrel offers efficiency of greater than 90% peak and pin-selectable output voltage, switching frequency, and current limit. A wide input voltage range of 4.5 V to 19 V makes the part useful for distributed 12-V point-of-load applications.

The switching frequency of the MIC24046-H can be programmed to one of three options: 400 kHz, 565 kHz, or 790 kHz. Programmable output-voltage choices include 0.7 V, 0.8 V, 0.9 V, 1.0 V, 1.2 V, 1.5 V, 1.8 V, 2.5 V, and 3.3 V, while an internal divider is used to achieve ±1% voltage-output accuracy. The current limit of the regulator can be programmed to 3 A, 4 A, or 5 A.

Buck converter is pin-programmable – [Link]

2A, 70V SEPIC/Boost DC/DC converter with 7µA Iq


by Graham Prophet @ edn-europe.com:

LT8494 is a current mode, fixed frequency SEPIC/boost DC/DC converter with an internal 2A, 70V switch. Quiescent current of 7µA suits the device for always-on automotive or other industrial battery powered systems.

The LT8494 starts up from an input voltage range of 2.5V to 32V and once running it operates from inputs from 1V to 60V, making it suitable for applications with input sources ranging from a single-cell Li-Ion to automotive inputs. The LT8494 can be configured as a boost, SEPIC or flyback converter. Its switching frequency can be programmed via a single resistor to between 250 kHz and 1.5 MHz, enabling designers to minimise external component sizes. The combination of a thermally enhanced TSSOP-20E or 4 x 4 mm QFN package and small externals ensures a very compact footprint.

2A, 70V SEPIC/Boost DC/DC converter with 7µA Iq – [Link]

A low-cost 0.5A 33V LED driver module with 90+% efficiency

LG-LED-150702-DF-Futuro Low-cost LED driver Design FigA

by Valentin Kulikov @ edn.com

This article describes simple constant current driver module with fast PWM input that can be used for driving medium and high power LEDs. The module uses an integrated constant-current output, DC-DC buck converter with output current configurable from 0.1 to 0.5A. This article outlines the schematic, design guidelines, operation, and performance of the low cost LED driver.

A low-cost 0.5A 33V LED driver module with 90+% efficiency – [Link]

Simplify DC-DC Converter Characterization




by Mary Anne Tupta @ edn.com:

DC-DC converters are widely used components that convert DC power from one voltage to another, producing a regulated output voltage. These devices are used in many electronic products, including laptops, mobile phones, and instrumentation. Like any device, DC-DC converters need to be characterized by manufacturers and by engineers evaluating them for a design.

Given the increased pressure to develop products that consume less power, design engineers are looking for ways to increase power conversion efficiencies. Thus, numerous measurements are required to characterize the electrical parameters of DC-DC converters.

Simplify DC-DC Converter Characterization – [Link]

LM5160A Wide Input 65V, 1.5A Synchronous Buck / Fly-Buck™ Converter


TI introduces industry's first 65-V synchronous step-down converter with Fly-Buck(TM) capability (PRNewsFoto/Texas Instruments)
TI introduces industry’s first 65-V synchronous step-down converter with Fly-Buck(TM) capability (PRNewsFoto/Texas Instruments)

LM5160A 65V, 1.5A synchronous buck converter with integrated high-side and low-side MOSFETs is the industry’s highest power synchronous buck regulator and supports TI’s innovative Fly-Buck™ topology to deliver isolated bias supplies up to 15W with no opto-isolator.

LM5160A offers great flexibility which enables direct point-of-load regulation from a wide input voltage range of 4.5V to 65V and also simplifies isolated DC/DC designs by enabling very good output regulation with no opto-coupler required.

LM5160A Wide Input 65V, 1.5A Synchronous Buck / Fly-Buck™ Converter – [Link]

60V LED Driver with Internal 4A Switch & PWM Generator


The LT3952 is a current mode step-up DC/DC converter with an internal 60 V, 4 A DMOS power switch. It is specifically designed by Linear Technology to drive high power LEDs in multiple configurations. It combines input and output current regulation loops with output voltage regulation to operate as a flexible current/voltage source. The LT3952’s 3 V to 42 V input voltage range makes it ideal for a wide variety of applications, including automotive, industrial and architectural lighting.

60V LED Driver with Internal 4A Switch & PWM Generator – [Link]

Safe DC/DC Converter up to 1.5 A

The design of the circuit is a DC to DC converter. It supports up to 1.5A on VCORE. It features a DC/DC converter that provides power to MCUs. It also deals with the optimization of energy consumption by using DC/DC linear regulators and ultra-low-power saving modes. The model contains a Serial Peripheral Interface (SPI), an advanced functional safety measure that allows control and diagnostics with the MCUs.

The KIT33907AEEVB and KIT33908AEEVB evaluation boards demonstrate the functionality of the SMARTMOS MC33907 and MC33908 power system basis chips, respectively. These ICs are equipped with an intelligent power management system including safety features targeting the latest ISO26262 automotive functional safety standard. The evaluation board is a standalone board that can be used either with a compatible microcontroller or with PC. In the latter case, it is necessary to use a KITUSBSPIDGLEVME accessory interface board. The MC33907 and the MC33908 are multi-output ICs with power supply and HSCAN transceiver. These devices have been designed specifically for automotive market. All features of thse two ICs are the same except that the MC33907 is designed to support up 800 mA on VCORE, while MC33908 will support up to 1.5A on VCORE.

The DC to DC converter that supports up to 1.5A on VCORE has the following applications: electrical power steering, engine management, battery management, active suspension, gearbox, transmission, electrical vehicle (EV), hybrid electrical vehicle (HEV) and advanced driver assistance systems

Safe DC/DC Converter up to 1.5 A – [Link]

Aren’t you very satisfied with “empty” datasheets?


Top-class component should be equipped with a top class documentation. That´s also a case of many AC/DC and DC/DC modules series from Traco Power.

Demands of various application also vary. While somewhere it´s enough to know, that a given power supply will give us „some DC12V/1A“ or that a given „LED shines green and withstands 20mA“, in majority of cases we naturally need much more about a given component. Somewhere at the end of this chart are applications, where we need to know literally every parameter, including commonly non-mentioned parameters and graphs from a real measurement.

From this point of view, Swiss company Traco Power is really helpful at development and at selecting given AC/DC or DC/DC module, as all power modules are equipped with quality documentation in a form of detailed datasheets, certificates, 3D drawings and similar. Masterpiece – the application notes are available for several „high performance“ modules like for example TEN8WI module.

TEN8xxxxWI is the 8W DC/DC isolating module with a high energy density, enhanced range of operating temperatures and a wide input voltage range( 4:1). Besides a common documentation, there´s also available the TEN8WI application note, where we can find all important information for successful usage even in critical applications (EN50155-railways), including EMC characteristics, thermal consideration, recommended PCB layout and other.

For applications, where we don´t require that wide input voltage range, the standard TEN8 version (non- „WI“) is intended. In the TEN8 and TEN8WI families can be found a large amount of types with various input voltages (input 9-18VDC, 18-36, 36-75 or 9-36, 18-75 at the WI series) and 3.3 to 15Vdc output, including symmetrical ones (for example +-12V). On stock we keep a few versions, all other versions we´re able to supply you in a short leadtime.

Detailed information will provide you datasheets at particular types, as well as above-mentioned TEN8WI application note, TEN8WI certificate, TEN8WI-3D drawing and the TEN8 series filter design.

Aren’t you very satisfied with “empty” datasheets? – [Link]

Buck Converter (DC-DC)


by xKOBAYASHIMARUx @ instructables.com:

Buck Converters are great! I use them all over the place in many of my nerdy, techy, geeky hobbiest projects. They also can commonly be referred to by other names, a DC-DC converter or a switching regulator. Essentially what it does is take some higher voltage in (higher than what you want for your project), chops it up, and pieces together a lower voltage. It might help to think of it as a transformer for DC circuits… only without the giant iron block… and without the long coils of wire… and with only 3 pins.

Buck Converter (DC-DC) – [Link]