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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20 views

Bidirectional DC-DC converter, 12V - 300V, 1 kW?

What DC-DC converter topology would you recommend for a device that supports bidirectional power flow of up to 1kW with 300VDC on the high-side and 10-15VDC on the low-side? I want to use it to ...
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2answers
52 views

Help understanding switching voltage regulator (OKR-T/1.5-W12-C)

Looks like I need help understanding how to use the OKR-T/1.5-W12-C DC/DC voltage converter, b/c I just burned two of them. I am obviously doing something wrong, but I don't understand what. Here's ...
1
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1answer
29 views

Current Controlled Output Using PWM

I am looking to control a proportional valve with a PWM signal that will correlate into exact current amounts (for example a 25% duty cycle will output 200mA, and a 90% duty cycle will produce let's ...
1
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3answers
75 views

Motor Discharges Boost Converter Too Quickly

I am trying to step 3V up to 9V via a boost converter, the idea being I have the current but not the voltage to drive a DC motor. I used this this website to calculate the parts values I would need, ...
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1answer
41 views

Step-up converter generating too much voltage

I have the issue that I want to convert 5v DC to 12V DC. I have several 5v to 12v step-up converter at my hands which all output around 15v without any load connected. Now I heared these need a ...
2
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1answer
155 views

How to select a DC-DC converter topology?

I've been simulating a switched mode 12V to 170V boost converter, and it has been quite the learning experience. If my observations are correct, power losses in the circuit not only increase as the ...
3
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1answer
73 views

Why input/output ground is different and connect them by 0.1 ohm resistor?

This is a sample schematic at On Semiconductor TL494 datasheet. It's a buck converter using pnp BJT (Tip 32A) as a switch. What I'm interested in is the 0.1 ohm resistor (in yellow circle). I ...
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2answers
92 views

3.7v > 3.3v voltage stepdown with logic-driven on/off control [paused]

(PAUSED): This topic is currently on hold as I source necessary hardware. I need to connect a Wi-Fi/RS232 module to a low-powered monitoring device, and for maximum portability, I'd like to power the ...
1
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1answer
56 views

Buck boost converter for lipo 6s charge info request

I need to dimension a Buck boost converter to charge two LiPo battery packs 6s 20ah starting from a variable input voltage. Both packs have their own PCB BMS board. This one: ...
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2answers
68 views

Cheap high-voltage low-current source

I'm looking to make a high voltage supply for some geiger-mueller tubes (the ubiquitous sbm-20 russian surplus tubes that everyone uses). these don't require much current at all, so creating high ...
1
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2answers
139 views

How to adjust output current on a buck converter?

I 'm planing to use a zinc–carbon 9 V battery to power up: the circuit that battery belongs to BeagleBoard-xM I 'm thinking of using a breadboard, in order to power up both circuits. ...
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3answers
82 views

2xAAA battery => 3.3v/250mA step-up converter with logic-driven power control [superseded]

EDIT: The requirements in the question below appear to be practically unsolvable, but happily after a bit of digging I actually found an alternative equivalent RS232 device which runs off a 3.7V Li-Po ...
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0answers
62 views

Solar cell powered supercapacitor charger with strange output voltage regulator problem

I have a strange problem in a low power circuit design. I designed a buck-boost converter as a maximum power point tracking circuit (control the output of solar cell within a small voltage range ...
4
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2answers
79 views

SMPS, output ringing?

I built an SMPS (see here for details), and so far it's been working good. But I noticed a strange oscillation (or ringing?) at the output. Here's what it looks like, with a 4 amps load: Now, ...
2
votes
3answers
81 views

Murata OKR-T/10 pulldown value

On the Murata OKR-T/10, the data sheet specifies a 49kohm pulldown resistor but I've seen people using a 1k. Is there a more correct value or does anything 1k or above work just as well?
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2answers
195 views

Is this a good layout for a 5A buck converter?

I have updated this question with the suggestions in comments and answers. Make sure you read everything. I want to make a PCB for a switching regulator (buck converter). It's a TL5001-based ...
1
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1answer
89 views

How to use “Voltage controlled switch” in OrCAD?

In this OrCAD project, I tried to build really basic DC-DC Converter with use of "S" or "SBreak" parts in OrCAD's Analog Library. But, According to analysis (picture below), the blue DC line should ...
3
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1answer
112 views

Why some LM25xx DC-DC adjustable step-up converters have two negative connections (IN- & OUT-) instead of only one ground?

Recently I came across several 4-pin LM25xx DC-DC adjustable power converter modules such as the ones below. LM2577 Adjustable Step-up Converter Module from Amazon.com DC-DC adjustable step up power ...
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1answer
70 views

Discrete MOSFET driver, limiting voltage

I would like to use the example circuit, from TL5001's guide, for a wider voltage range. I need it to work with almost 50V input. Here's the circuit: Now, the problem with this is that Q3 pulls ...
0
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1answer
136 views

Have I damaged this DC-DC converter? [closed]

I bought this DC-DC Adjustable Power Converter Module, to convert 12V DC to 5V DC. Initially it was working fine, but I connected IN- and OUT- pins to the each other and used it as a common ground ...
1
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1answer
48 views

AP1509 DC-DC Power Supply calculating Inductance?

I'm working on an embedded system which I want to enable USB Host on for a few devices. As I'm supplying USB Devices with current and am not sure of my own on board current requirements I decided I'd ...
0
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2answers
83 views

LM2577 based boost converter board gives random shut-downs with a 3.7v Li-Po

I recently bought a LM2577 based boost converter board from dfrobots.com such as the one below. I'm trying to use it to generate a stable 5v from a 3.7v 2100mAh Li-Po battery. The Li-Po voltage was ...
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2answers
79 views

Advantages of Isolated DC-DC Converter over non-isolated?

I am trying to understand in what type of situation I will need an isolated DC-DC converter instead of a non-isolated one. What are the design criteria that can lead one to one way or another? In my ...
0
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1answer
184 views

How can I power Beagle Bone Black with 3.7V LiPo?

I want to power this board with a 3.7V LiPo battery (due to small form factor) such as this. Would I need a step-up DC converter or something? And where on the BBB would I connect it?
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2answers
81 views

Linear voltage reducer

My question is in reference to the circuit above. (An EE non-graded assignment.) What is the purpose of R1 in this circuit? My feeling is it's providing bias and/or feedback to act as a current ...
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0answers
55 views

Multiple stacked DC-DC converters

I am trying to minimze the output voltage ripple of a 4-layer pcb power supply and am curious as to what approach would be better. So I have 6 low voltage high amp buck converters feeding 6 chips. ...
2
votes
2answers
107 views

What is the correct way to handle inrush currents from a DC/DC converter with short-circuit protection?

I have been using CUI VESD2-S24-D12 to generate 24V to run a circuit board. That regulator has been EOL'd with the recommended replacement being PEM2-S24-D12. The two are effectively identical except ...
0
votes
1answer
246 views

Problem with PWM generator SG1525(SG3525)

I am designing a Full Bridge DC to DC convertor using SG1525(SG3525). I'm doing the simulations in OrCAD Capture(PSpice). Actually, I've successfully simulated the Power section of the converter using ...
0
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1answer
372 views

How to use Boost Step-Up Converter MC34063

I am trying to use a MC34063 switching regulator to step-up 5v to 12v. I have wired it up as shown below, I think its the same as the datasheet. But I only get ~4 volts out. I know the capacitors ...
3
votes
2answers
133 views

Stabilizing the UVLO feature on a DC/DC converter

Very many DC/DC controller IC's utilize an under voltage lockout feature by way of an external pin monitoring the applied voltage and comparing it with some internal reference, putting the IC into ...
1
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1answer
86 views

How to determine the need for a blocking diode

I am powering an Arduino using a DC/DC converter to the Vin pin. The supply voltage is 32V and the output is 12V with a 500mA limit. The manufacturer recommends using a blocking diode "if current can ...
4
votes
1answer
90 views

How to use an ADC with a non zero lower reference voltage input

I need to convert, linearly, a voltage in the range of about 1v to 2v into the range 0 to 1v for input to an ADC. This is the background: I fiddle with electronics and programming as a hobby to give ...
1
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1answer
88 views

Charging 24V battery from 12V-24V converter

I have a wind turbine, which generates 12V/400W and two 12V batteries connected in series to have one 24V. I have two questions, is it possible to charge them from the turbine just through the 12/24V ...
3
votes
1answer
123 views

What dc-dc topology to use for a 300W step-up converter?

I am asked to design a dc-dc converter with the following specifications: Vin=24V(2 lead-acid batteries in series), Vout=300V and Iout=1A. My initial choice of topology was the boost converter. ...
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1answer
116 views

9V DC dual polarity supply from 12V DC source

I have a headphone amp/splitter device that runs from a 9V AC, 750mA wall wart. I would like to get the device running from a 12V DC supply. I have taken a look inside the unit and it basically ...
1
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1answer
58 views

Power rail design from Li-Polymer battery chip output

Case: I am building a battery driven device and so far it seems like I will be using the MCP73871 to provide my device with battery power and charging via USB. I need to regulate the output from the ...
1
vote
1answer
44 views

Looking for some solar panels to go with this project

I've been looking around for some solar panels for a little homemade solar phone charger project. I recently found a portable phone charger project from a student at Cal Poly which I'm hoping I can ...
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4answers
133 views

Adding up DC DC Converters in series

I am trying to step up my voltage from 5 volts to 36 volts.The only way that i am seeing this is to have a DC DC Converter.I am planning to use a DC Converter which steps up 5 volts to 12 volts each ...
1
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1answer
66 views

DC-DC converter/regulator lead-acid battery charger design question

I am trying to build a DC-DC voltage converter/regulator for a bicycle generator (dynamo). Expected unregulated input voltage range will vary with the speed of the bicycle (about 0 - 120Vdc) and want ...
4
votes
3answers
302 views

What is the most efficient way to power a solar computer (5V) from a 12V lead acid battery?

My project: Power a Beaglebone Black (BBB) entirely from solar energy. Obviously energy efficiency is crucial here. My setup so far: PV panel connected to a deep-cycle lead acid battery. Now I need to ...
0
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0answers
54 views

Regulation of DC/DC output voltage and current

I found interesting topic recently, here is it: What is causing the oscillation in the feedback loop of an SMPS? Could somebody explain to me, how does this circuit supposed to charge deeply ...
0
votes
2answers
84 views

How is this MOSFET in a LTC3862-2 datasheet example only 60V? <solved, user error> [closed]

SOLVED I was somehow looking at the wrong part (SI7370DP, not SI7430DP). This is sort of a useless question now. I'm looking at the LTC3862-2 current mode step-up DC/DC controller for a 100V 1A ...
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votes
2answers
226 views

Convert 48V battery bank to 12V for boat appliances - Inefficient?

I need a 48V bank for an electric motor on my boat. I also need 12V for my appliances. Obviously keeping both a 48V and 12V bank would be most efficient but the space required and cost of maintaining ...
1
vote
1answer
109 views

24 to 96V Boost Converter independent from the load

How can i build a boost DC/DC Converter that can boost from 24 to 96V without the output voltage depending on the load? Why? Because i need to charge a battery system that has already been designed ...
1
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1answer
53 views

Low noise High current regulator

I'm trying to convert 11-16 Vdc to 5 Vdc @ 3 A to run an array of low-impedance ratiometric sensors. The outputs are going either directly into an ADC or amplified through an instrument amplifier. ...
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votes
1answer
112 views

USB host power dc/dc converter chip [closed]

I'm looking for a (cheap, surface mount) single-chip dc/dc converter to power a USB connection. I'm thinking that with so many USB chargers available, there might be a chip available specifically ...
3
votes
1answer
98 views

Buck Converter with resistive load

I was reading a chapter on Step down Choppers(Buck Converters). I had trouble understanding the operation of the circuit as it wasn't explained properly in the book. When I looked up on the internet , ...
0
votes
1answer
152 views

0-24V 0-47A DC-DC Converter

I have built a 12/24V 47A DC Power supply following this guide. It works well for running my battery chargers, but I'd like to make it a CCCV supply from it for my projects. What would it take to ...
4
votes
2answers
117 views

Are Buck converters conceptually same in low/high power applications?

I am new to power supply circuits. I am studying datasheet of buck regulator LM22676 which generate 5V/3.3V dc for micro-controller supply in one of my system.The datasheet says it has a N-channel ...
1
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1answer
428 views

Building a low-power solar/wind buck-boost converter

Using a 18V(max) solar panel, I'd like to charge a 12V lead-acid battery. I'm working from the basic inverting buck-boost circuit. My main question is, being a relatively low-power circuit, can I ...