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21 May 2015

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]

20 May 2015

obr1704_1

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]

19 May 2015

FB5YW1RI9SMRLAI.MEDIUM

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]

18 May 2015

3892-1

The LTC®3892/LTC3892-1 is a high performance dual step-down DC/DC switching regulator controller that drives all N-channel synchronous power MOSFET stages. Power loss and noise are minimized by operating the two controller output stages out-of-phase.

The gate drive voltage can be programmed from 5V to 10V to allow the use of logic or standard-level FETs and to maximize efficiency. Internal switches in the top gate drivers eliminate the need for external bootstrap diodes.

LTC3892/LTC3892-1 – 60V Low IQ, Dual, 2-Phase Synchronous Step-Down DC/DC Controller – [Link]


28 Apr 2015

article-2015april-the-advantages-and-downloads-fig3

by Steven Keeping:

Such is the popularity of DC-to-DC voltage converters (“switching regulators”)––due to their high efficiency across wide input- and output-voltage ranges––that chip makers have focused a lot of research dollars on squeezing the essential components of the devices into modules. These modules typically include pulse-width-modulation (PWM) controllers and switching elements in a single, compact package, easing the design work for the engineer.

However, until recently, it has proven difficult to include the energy-storage device (the inductor) inside the package. This has dictated that the engineer must specify, source, and design-in the inductor as a peripheral component, adding complexity and consuming board space. Now, a new generation of high-frequency switching regulators has enabled the use of smaller inductors enabling the devices to be housed inside the component vendor’s package.

The Advantages (and Drawbacks) of DC-to-DC Voltage Converters with Integrated Inductors – [Link]

12 Mar 2015

IFD2609_F1

by Petre Petrov @ electronicdesign.com:

The bipolar NE555 timer IC is widely used in inductorless dc-dc converters, most frequently in doubling and inverting converters. However, another very popular IC, the LM386 audio amplifier, may be a better solution in this application. Note that the results also depend on the specific manufacturer of these multisourced ICs and on the quality of the related components. (We will use only Schottky diodes, to reduce the voltage losses to the minimum.)

Comparing the NE555 Timer and LM386 Amplifier as Inductorless DC-DC Converters – [Link]

4 Mar 2015

DN523f1

by DAVID BURGOON @ edn.com:

There are several ways to produce a negative voltage from a positive voltage source, including using a transformer or two inductors and/or multiple switches. However, none are as easy as using the LTC3863, which is elegant in its simplicity, has superior efficiency at light loads and reduces parts count compared to alternative solutions.

The LTC3863 can produce a –0.4V to –150V negative output voltage from a positive input range of 3.5V to 60V. It uses a single-inductor topology with one active P-channel MOSFET switch and one diode. The high level of integration yields a simple, low parts-count solution.

AppNote: Inverting DC/DC controller converts a positive input to a negative output with a single inductor – [Link]

6 Feb 2015

AppSchemx600

by Steve Taranovich @ edn.com:

Linear Technology Corporation just announced another in its series of power management ICs for automotive usage, the LT8640, a 5A, 42V input capable synchronous step-down switching regulator. A unique Silent Switcher™ architecture, combined with spread spectrum frequency modulation, reduces EMI/EMC emissions by more than 25dB even with switching frequencies in excess of 2MHz, enabling it to easily pass the automotive CISPR25, Class 5 peak limits. This feature varies the clock with a triangular frequency modulation of +20%.

Silent Switcher with high efficiency and low EMI/EMC – [Link]

3 Feb 2015

8709

by Susan Nordyk @ edn.com:

A synchronous PWM controller for negative-to-negative or negative-to-positive DC/DC conversion, the LT8709 from Linear Technology is easily configured for buck, boost, buck-boost, and inverting topologies to accommodate a wide range of power-supply designs. The device’s synchronous operation means that the output diode is replaced with a high-efficiency P-channel MOSFET, increasing efficiency and allowing for higher output currents of up to 20 A. It also eliminates the heat sink typically required in medium- to high-power applications.

The LT8709 operates over an input range of -4.5 V to -80 V and produces an output from -0.1 V to as high as 60 V or from -1.4 V to as low as -80 V. Its rail-to-rail output-current monitor and control enable the device to be configured as a current source. The controller has an EN/FBIN pin that accepts slowly varying input signals, as well as an adjustable undervoltage lockout function.

Buck/boost/inverting controller delivers up to 20 A – [Link]

2 Feb 2015

3790

Linear Technology announces the LT3790, a synchronous buck-boost DC/DC controller that delivers up to 250 W of power with a single IC. Its 4.7 V to 60 V input voltage range makes it ideal for a wide variety of automotive and industrial applications. Its output voltage can be set from 0 V to 60 V, making it well suited as a voltage regulator or battery/supercapacitor charger. The LT3790’s internal 4-switch buck-boost controller operates from input voltages above, below or equal to the output voltage, making it ideal for applications such as automotive, where the input voltage can vary dramatically during stop/start, cold crank and load dump scenarios. Transitions between buck, pass-through and boost operating modes are seamless, offering a well regulated output in spite of wide variations of supply voltage. The LT3790’s unique design utilizes three control loops to monitor input current, output current and output voltage to deliver optimal performance and reliability.

60V, Synchronous Buck-Boost Controller – [Link]



 
 
 

 

 

 

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