DC-DC conversion. Implies conversion of a DC voltage level up or down. DC-DC converter can be isolated or non-isolated. Electronically it can be done by many kinds of circuits, depending upon the application (charge pumps, voltage multipliers, linear voltage regulators, boost/buck switched ...

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3answers
42 views

The role of reference voltage in buck converters?

I asked a question here which made it quite clear that it's probably not a good start to make something that I plug directly into the mains. Instead, I've decided to build a low-voltage buck ...
1
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3answers
98 views

Buck converter based switching power supply?

simulate this circuit – Schematic created using CircuitLab I have designed this circuit based on a buck converter. I'm just having trouble finding out which values to plug in. I.E. C1, ...
0
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2answers
43 views

Solar Cell to DC-DC converter to Li-Ion charing module, is the DC-DC converter necessary?

I have the following components: 1W Solar Cell (5V at 200mA): http://www.ebay.ca/itm/291435192356 DC-DC Converter (2.5V Vin_min, set to 5V Vout): http://www.ebay.ca/itm/200983543561 5V Lithium Ion ...
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2answers
49 views

DC-DC & Solar Question

I normally am pretty good with electrics and they taught us about them in a few of my classes, specifically my into to engineering courses. I however don't know a ton about solar panels so this ...
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0answers
18 views

How does Mean Well LDD range DC-DC constant current drivers handle dimming?

Mean Well LDD range DC-DC, constant current buck drivers have dimming function. 5v PWM signal allows you to dim the LEDs. Without PWM, you get the full rated current output. Now knowing anything ...
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2answers
101 views

Is it OK to use switching regulators to charge mobile phones (and such)?

I had several issues with car usb adapters (dc-dc step-down regulators), and I'd like to make one myself. Issues: Nokia cell phone refusing to charge Motorola phone power supply circuitry fried ...
2
votes
1answer
61 views

Switching supply burning mosfets, what is happening?

I have been working on a SEPIC converter for an electronic cigarette power supply. This application involves using two 3.7v INR batteries in parallel, rated for an appropriately high current ...
0
votes
1answer
26 views

Does DC DC switching converter needs pot readjusting on input voltage change?

I have adjusted my LM2596 regulator to 5V output with 16V input. I'm about to change the input to 25V. Will my 5v output stay the same or do I need to adjust the pot again ? I can't easily test ...
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2answers
36 views

Working 12V ups circuit?

I've looked at similar threads on stackechange but none seem to provide an answer. I have 2 devices running on 12v DC. One at 1A and the other at 2A. I had an existing 12V 7Ah lead acid battery ...
0
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0answers
64 views

Does anyone know why DC-DC converter have noise

I am running an issue that my custom board has noise come from DC-DC converter after running a while. I used V78W-500 as the DC-DC converter and already replaced a new one. Except noise, the voltage ...
0
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1answer
22 views

Periodic Steady State voltage Buck Converter

What does Periodic Steady state mean with regard to a Buck Converter ? Does it mean the normal operation ? Also, From what I read, the net change in the capacitor voltage in the buck converter is ...
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votes
1answer
54 views

MC33063 heating problem

I'm using a MC33063 to generate a -9V supply to power 7 TL084's. I'm using a 7805 regulator to power the 33063 circuit. However, the IC and the regulator heats up a lot -- I burned one IC due to that. ...
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1answer
30 views

Power switchers copper fill / region

When is it considered that too much is too much when it comes to copper fills on DC-DC switchers. I am currently laying out a Buck, 3 Amp max output. Every literature that I have scanned before ...
0
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2answers
61 views

LM2623 Regulator

I'm implementing a DC/DC regulator and you can find the datasheet in this link. What I'm trying to do it's basically reproduce the application note in order to have Vin = 12V and Vout = 5V 1Amp but ...
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1answer
40 views

Design and analysis of Two inductor boost converter [closed]

how to decide inductance values in case of two inductor boost converter?
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1answer
24 views

Linear Technology PMIC (LTC3566) - powering circuit entirely from VOUT1

I'm looking into Linear Technology's LTC3566 PMIC for an upcoming portable design. Its a really nice PMIC with a buck-boost regulator on-board. Here is the typical application: The reason I want to ...
0
votes
1answer
32 views

boost converter load problem

I am designing a boost converter for wind turbin, with load 12Vdc, 2A. Before I install my boost converter on my windturbin, I putt a test to make sure it work properly. So I use this circuit to ...
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votes
1answer
69 views

Solar boost converter unstability

My design of a boost converter is the following Input: 40V/1.5A Output: 100v/0.62A Inductance used: 3.15mH Capacitance used: 220uF (rated 200V) diode switch used: IRF830 (rated Vds=500v) ...
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1answer
51 views

An current source with UC3842

I find an adjustable current source circuit with UC3842, but without description. The main difference with a voltage regulator is the error amplifier's negative input comes from the current sensing ...
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1answer
40 views

Inductor Core Loss: Volt-uS vs. Irms vs. Switcher Frequency

For DC to DC application, I see these charts often for inductors, but I don't understand what they actually mean. What does this chart mean, and how does it relate Volt-uS, Irms, & Freq? Edit: ...
0
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1answer
30 views

Supply microcontroller and solenoid with the same battery at different voltage levels

I'm working with a microcontroller which its supply voltage range is 1.8V to 3.6V I want to connect a solenoid to this mcu (this solenoid will be activated occasionally). Current–voltage ...
0
votes
1answer
152 views

RPI with power supply alternating between Li-ion battery pack and DC 5V

I have a Raspberry Pi model B+ and I've been trying to design a solution so that I can switch power supply without having to shutdown. The idea is this: I have 2 li-ion 18650 batteries with ...
0
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0answers
62 views

MC34063 issue. Switches off every cycle

I am using MC34063 in step down configuration but the converter switches off every cycle. Following are the calculations and specifications: Vin - 9 to 12V Vout - 5V Imax - 0.3A Rsc - 0.36 ohms L - ...
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2answers
70 views

Can I safely substitute a DC converter for the Macbook's AC adapter?

I want to go from this: to this: The converter would be this: http://smile.amazon.com/dp/B00HVCWGNE or something like it. Does this sound safe? The step up converter would be set to a specific ...
2
votes
1answer
80 views

Standard transformer for higher-voltage dual output flyback converter

Is it possible to modify this flyback converter to get the output voltage somewhere up in the range of +/- 26-60v (preferably 30v or more) without having to make my own transformer? I would also like ...
1
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1answer
87 views

Voltage step up for bidirectional current source

I will be using a circuit similar to the following to create a bidirectional current source driving a max load resistance of 10k at a max of 2.5 mA. (based on this article ...
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votes
2answers
91 views

How to design a boost converter? And how to specify the inductor and capacitor values?

I want to design a boost converter with input of 48V and need to get to a voltage of 100V. How to select the inductor and capacitor values in it?
0
votes
3answers
60 views

Which low pass frequency filter to configure to measure/calculate DC-DC converter efficiency?

I am measuring the DC-DC converter active power (P in watts) efficiency of a TI (Webench) LM3150 PCB that converts 12 to 5VDC. In the answer of question Measuring precisely the efficiency of a power ...
5
votes
2answers
206 views

What is dead time in DC-DC converters?

In a power management integrated circuit (PMIC) documentation I came across a programmable dead-time parameter for a DC-DC converter. What does ...
7
votes
3answers
769 views

How does DCDC save power over an LDO?

I am using a camera module of our custom application. The camera module started consuming more current when compared to a previous board which has all the same settings, chipsets and modules. In our ...
0
votes
0answers
14 views

Averaging of state space equations for a multi input dc-dc converter

If I have a converter with one switch, then I can find the average state space matrices as A= kA1 + (1-k)A2 where A1 is matrix when switch is off and A2 when switch is off, k is duty cycle of the ...
0
votes
0answers
29 views

Averaging of state space equations for a multi input dc-dc converter

If I have a converter with one switch, then I can find the average state space matrices as A= kA1 + (1-k)A2 where A1 is matrix when switch is off and A2 when switch is off, k is duty cycle of the ...
0
votes
0answers
47 views

LTSpice parameter sweep of multiple values

I have designed a boost converter for my power electronics class in LTSpice. The thing works just fine, now all I have to do it fiddle with the component values and frequency to describe the trends I ...
0
votes
1answer
71 views

Power regulation and isolation for low current device

I'm looking for a solution to regulate power and provide isolation for a 3.3VDC system. I am using a 5VDC 500mA power supply that needs to be regulated to 3.3VDC with isolation to protect analog ...
0
votes
0answers
92 views

Single or dual ground plane for SMPS DC-DC converter?

I'm working on DC-DC converter prototype using dual layer PCB. Layout it finished using bottom layer as ground plane. Question is does make any sense to put on top layer also ground. How that can ...
2
votes
1answer
73 views

Reduce voltage by a constant 100mV

For a project I have a digital thermometer which outputs a DC voltage of 100mV at 20 degrees C and 250mV at 50 degrees C, which is the range we're interested in. We're putting that into an Arduino via ...
0
votes
1answer
32 views

5v or 6v operating dc-dc for mobile battery?

For mobile battery, what voltage is suitable btwn 5v or 6v? What factor does influence on choosing different voltage for mobile battery?
1
vote
1answer
66 views

Excessive Boost Converter Output

I'm implementing a boost switching regulator based on a Texas LM5002 chip (datasheet), to get about 65V from a 12V supply. The design I've arrived at is shown below, inspired both from the data on the ...
0
votes
2answers
36 views

Stepping-down DC voltage (at low current) in the presence of an audio circuit

I'm trying to add a bluetooth audio receiver to an old 12V battery-powered boombox. The receiver board takes 5V and shouldn't draw much current, but I'm trying to understand which type of DC-DC ...
0
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0answers
24 views

Find duty cycle ratios and ripples frequency in DC-DC converter

I am asked to find the duty cycle ratios (D1 & D2) and ripple frequency of the two control principles of the following circuit: The bridge is controlled to provide an average output voltage, Vo ...
1
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0answers
141 views

Step Up DC DC [12 to 300] using MAX1771 Chip

I am trying to build my first circuit following the information posted here 12v to 300v Boost Converter - Ideal Inductor for 9kOhm load I tried to answer there before opening this new topic,but I need ...
0
votes
2answers
79 views

How to convert 12v dc to smooth, as if coming from a battery, 6v dc (EMI – RFI free)

I’m an electronics newbie. I did a very simple project. In order to convert 12v dc to 6v dc I used one of those step down converters. Unfortunately what I’m trying to power is an AM radio. It power on ...
2
votes
1answer
57 views

AP5002 step-down switching regulator loop stability

Problem, parameters I have an 5V output power supply, with 2S LiPo input (6-8.4V), implemented with AP5002 (PWM control 2A step-down switching regulator, docsheet), and for the life of me, I can't ...
0
votes
2answers
64 views

Create a Time-Variable Dc Power Source

For some reason, I need a Time-Variable DC power source that changes it's value according to time. I need this changing of value to be controllable. I'll put it this way : Say I have a 12 volt DC ...
0
votes
1answer
92 views

using an “isolated DC/DC converter”, what is the schematic?

I'm trying to use a "isolated DC/DC converter" (5v --> 12v converter) (MEE3S0512SC, ...
0
votes
1answer
79 views

Output Capacitor value calculation based on Transient response in Buck converter

In Buck design, The output capacitor's initial value is calculated based on how much current transient buck will support. Few equations took from appnotes. from these equations, for A given ...
1
vote
2answers
90 views

Trying to build a circuit to boost 5 V DC to 250 V DC with fairly low current output

I am fairly inexperienced with electronics, but I am trying to build a 250 V DC supply from a 5V source. From research, I have run across charge pumps and boost converters. I tried using charge pumps, ...
0
votes
2answers
43 views

Which Power Management implementation to use and the differences therein

Upon using an 'RF to DC converter', DC power management is needed. There is a dilemma in the approach as there are a number available. From the storage capacitor, there is the 'Switched-mode power ...
15
votes
1answer
628 views

Isolated DC/DC Converter - Purpose of Capactor connecting two GNDs?

I've been looking at board mount isolated DC/DC converters to use in an application. I found this rather reasonably priced for my needs. Here is what I'm confused about, what is C103 doing here? Isn't ...
4
votes
3answers
318 views

DC-DC Converter Unusally Low Load Capability

I've been working on trying to get this SMPS to work for a while. I'm using an LTC1872, a step up DC controller with current limiting. The circuit used is the typical application provided in the ...