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Questions tagged [dc-dc-converter]

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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41 views

Increase Boost Converter Current

I'm building a portable charger for my phone using a large 2.7v supercapacitor, which uses a very simple boost converter to create 5v. I am not concerned about input current, however, when a load (my ...
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29 views

DCDC converter load step and phase margin

When applying load step to a DCDC converter we can approximate the phase margin from the presence/absence of oscillation and the crossover frequency as well from the response time. The question is: ...
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64 views

Why doesn't my bench PSU read current on a breadboard?

I've recently purchased a cheap eBay DPS3012 DC-DC converter supply. I intend to use it on breadboard projects. The "problem" is that the meter reads a 5V output, with no current being drawn and ...
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48 views

Printed Circuit Board design of a converter [on hold]

I need to use the internal circuitry for the following in my own PCB for the following: Input : 9-35V ; Output: 5V 10A, DC to DC converter It has a reference sold by same seller : DC to DC converter ...
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2answers
37 views

Feed-forward capacitor in SMPS feedback

I was looking at the TPS63700 DC-DC inverter datasheet and stumbled across the schematic below. It is a more or less usual buck-boost inverter topology schematic, except for the weird R4 and C3 ...
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47 views

Can a coil gun be made with a boost converter instead of caps?

So I’ve been starting to build a coilgun, and I find most designs either have capacitors or are just really bad. But could a high-voltage boost converter (40000v) and a momentary switch not be used to ...
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33 views

H-bridge using HCPL3180

I need help with my project which consists of designing an H-bridge with PWM. So far, I have designed half of an H-bridge, however I am not sure if this is correct. Can somebody guide me into the ...
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23 views

Isolated DC transformer circuit validity

I am having trouble understanding this circuit. The transformer is center tapped on both the primary and secondary windings. I am unsure of the validity of the circuit. A clear explanation of what is ...
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3answers
110 views

Can I convert 72V to 12V using potential divider?

In our automation project, we'll be using a buck converter to convert the DC voltage from 72V to 12V. This method of conversion is quite expensive!! We are converting the voltage to power the ...
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1answer
39 views

Zeta topology DC-DC converter unstable

So I've tried to build a Zeta topology DC-DC converter based on a simple buck converter IC XL4016, which works perfectly in a regular buck topology. However, when hooked up in a Zeta topology as shown ...
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1answer
30 views

add different current loads to test noise on DC-DC converter

I want to test the LTM8021 DC-DC converter (using an eval board I bought - schematic for it is below) for noise output at varying current loads (10mA, 100mA, 200mA, 450mA) and still fairly new to this....
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22 views

connecting 2 dc-dc converters output [on hold]

For a school project i need to connect the output of a boost converter (100V) to the output of a buck-boost converter. The buck-boost converter has an output of 100V and is feed by an solar panel. ...
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12 views

Problem opening a PLECS blockset in MATLAB

A friend of mine sent his simulation of a converter for which he had used PLECS. It is in the format "example.slx". I have MATLAB R2017b. I downloaded the PLECS block set for MATLAB and activated it ...
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2answers
855 views

Cuk topology patent

While searching for a good inverting SMPS topology, I stumbled across the Cuk topology which suits me perfectly by all means. The only thing that worries me is that unlike more common SMPS topologies, ...
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209 views

Convert 3v to 5v very high amperage using boost converter

I am trying to build a power bank that has 3 output USB ports that can provide 2.1 amp each; it has 8 LiPo cells. So total of 2.1×3=6.3amps so basically 7 amps at 5.1v out. I have built the ...
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68 views

What is the purpose of galvanic isolation?

Is it correct to say that the primary reason to have galvanic isolation (ensuring minimum clearance and creepage distance for required voltage of power circuit between HV and LV) between the HV power ...
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90 views

Capacitor in DC DC converter

As part of my circuit, I need to step down voltage from +15V to +-12V. For this purpose, I am using Traco TEN 20-2422WIN. I was going through its application note when I saw that they because of EMI, ...
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33 views

DC-DC bidirectional converter buck configuration

I am looking to solve the low frequency mismatch between the input power and output power of a single phase inverter. This is usually done with a very large electrolytic capacitor. I am looking to ...
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2answers
142 views

Vector network analyzer for SMPS feedback loop measurements

Does there exist a ready-made design for implementing the measurement hardware? You can buy the analyzer package from e.g. Omicron Lab but it's a hideously expensive piece of kit (4490€) considering ...
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1answer
99 views

Best way to convert 48VDC to 220VAC Pure Sine

I'm trying to convert 48VDC(input could be battery or not), to 220VAC(Sine) I've searched a lot and found different topologies so I'm not sure about which one to use. I'm expecting to have a 1600W ...
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1answer
92 views

High Side MOSFET Driver

I am familiar with the bootstrap circuit and its design procedure. The steps involve: a) Figure out the Qg of the MOSFET at the Vgs you plan to operate (for instance Vgs=15V, Qg=150nC). Next, figure ...
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3answers
92 views

Add constant DC voltage to a variable DC input

I'm designing a PCB and I need a voltage rail, roughly 3 volts above the main input (of 3 - 30V). This rail is to power some CMOS devices, so it won't need to supply much current. Currently I plan on ...
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1answer
36 views

Gate Driver topology for Buck boost Converter

I am implementing inverting Buck-Boost Converter in hardware as shown in the picture attached. The output of this converter is negative. so I will have an issue with its gate driver. The gate driver ...
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1answer
97 views

How can I boost 1 Volts 30 Ampere input to 5V with maximum Current limit of 5A?

How can I boost 1 Volt 30 Ampere DC input to 5V DC with a maximum Current limit of 5A?
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31 views

How to generate and/or improve this power distribution for these 4 subsystems?

I am trying to design a system that is powered through a 28V wall adapter and a 6S cells LiPo battery. The system has a subsystem that takes care of the balanced charge, coulomb counter, charge ...
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1answer
36 views

Non-isolated DC power distribution for an appliance

I am building an appliance where we have a device where we need to have a +48 V/300 W DC power rail and a +24 V/300 W DC power rail. The AC (mains) should be world-compatible (both low- and high- ...
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2answers
55 views

Buck-converter dynamic output-voltage using digital-potentiometer

I am driving a load at 40 V, 4.8 A, and would like to dynamically change the voltage being supplied to it, ideally creating a 2-40 V range with increments of <0.1 V. To achieve this, I am thinking ...
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43 views

Why is the negative rail oscillating in this TPS65130 based design?

I designed a board with +-10V dual rail supply that are generated by a TPS65130. The design is loosely based on the reference schematic and layout. I had to move some components around due to board ...
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1answer
55 views

Step Down Switching Regulator irregularity with ripple on output

Using the L5973D- I have followed the Schematic as the datasheet instructs, but I have tried two different inductors. I have found problems with other systems on the board with the one inductor (744 ...
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1answer
58 views

Buck converters

I have seen many high watt like 1200 or 1500 watt boost converters and not a buck converter with that high wattage or power rating . I'm planning to make one buck converter (input- 35 volts output-3 ...
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44 views

How to set output voltage on this dual output buck converter board? [closed]

I guess this board's dual output voltage is configured by the EN terminal? Resistance to ground? (Link to the eBay listing: 20W DC-DC Step UP & Down 5V-35V 12V 24V to ±5V ±9V ±12V ±15V Dual Power ...
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2answers
80 views

Switching Regulator Voltage Dropping Unexpectedly

I am trying to determine what exactly is causing the below switching regulator/ DC-DC converter module to not maintain its rated output voltage. http://www.meanwellusa.com/productPdf.aspx?i=794 I am ...
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1answer
33 views

LTC1775 Buck converter component question

I am trying to design a 12v,10A buck converter using a with LTC1775 and have gone through the calculations assuming a 40% inductor ripple current and a switching frequency of 150kHz. This gave an ...
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1k views

How does this overcurrent indication circuit work?

Can anyone explain how the overcurrent (OVC pin) circuit below works? I am lost in all these transistors. I only get that it will output +5V on the OVC pin in the event of an overcurrent condition on ...
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43 views

Why does my battery boost converter have such a large overshoot and take so long to reach steady state?

I am trying to simulate a lead-acid battery with a boost converter to a 150 ohm load in simulink but the load voltage has a massive overshoot and takes about 0.5 seconds to reach steady state, as you ...
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2answers
42 views

Car battery(12v) to 7v 2a (to power fan controller)

I recently installed an amplifier and sub woofer in my car and it is gets up to 40C where I live so my amp gets VERY hot. I want to build a box/amp rack for the amp which will have fans on each side ...
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1answer
94 views

Cause for failure after short circuit Step-Down Converter Input

I'm currently evaluating the Semtech TS30042 step-down converter. My input voltage is 24V, output voltage is 5V. I followed datasheet recommendation in my layout in most aspects. The problem is, as ...
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1answer
32 views

Can R-783.3-0.5 DC-DC converter be used with 5V input?

I need to use a DC-DC converter to obtain 3.3V/100mA from a 5V supply. I have a R-783.3-0.5 available, but I am not sure if it can work with 5V input. The datasheet says that the minimum input ...
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1answer
39 views

Connecting battery cells in series VS using boost converter

I need a dc output of 12V 60AH through 18650 li-ion battery cells to use with a 1000W AC inverter to power a 650 Watts computer ( each cell 3,7 Volts 3500 mAh ) One way would be make 17 packs in ...
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62 views

Laser Diode Driver and Cooling

I am a newbie at analog design, and trying to design a laser diode driving circuit and TEC cooling circuit for a 14 pin laser diode, such as P1550-ADF-B: 1550NM ADF LASER DIODE which has forward ...
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48 views

How to do switching noise analysis of dcdc on LTSpice

Background : In one of my board i have used LT8471 as DCDC , as my cards being analog cards, i tried maximum to seperate the power network and analog chain from noise, my initial problems with dc-dc ...
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2answers
88 views

Non-isolated DC-DC buck converter layout - which one is better

I'm doing a DC-DC buck converter routing, using TPS62130. As known, the key point to route a DC-DC converter is to reduce the current loop area. In my design, I have a dedicated ground plane, so I ...
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1answer
39 views

What load can i connect if data sheet is missing output voltage

I am looking at a DC to DC converter data sheet that has an input voltage of 0V-100V. The datasheet only mentions a max output current of 4 amps. Is it safe to assume I can place a load of any voltage ...
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2answers
150 views

DC-DC switching converter PCB design

Recently I had a problem with noises in my led driver. I realized that my PCB design was terrible, so I redesigned whole PCB following common rules. Could you take a look and check if my new design ...
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1answer
32 views

LM2596 Cin requirements

I'm going to use an LM2596. My maximum input will be 40V to a fixed output 5V 3A. I've read in the datasheet that for Cin you need 1.5x for an electrolytic capacitor. So 40V x 1.5 will be some 60V. ...
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3answers
129 views

How does using a DC-DC step down converter save power?

I understand how DC-DC buck converters save power when compared with a linear regulator, but do they save power when compared to not using power conversion all together? In my specific case, I have a ...
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40 views

How would you regulate/use 60V/1A or 12V/100mA to get ESP's 3.3V/~300mA?

I have a device with two possible output pins with max. rating 60V/1A and 12V/100mA that I would like to connect to an ESP8266 (that sends notifications when ON). To keep it simple, I would connect it ...
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2answers
70 views

Powering inverter gate needed for enabling a DC-DC converter

I'm designing a plugin card that's powered at 12V from the main board. Now, I need a 3V3 and a 2V5 voltages on the card, so I'm using two buck converters MUN12AD03-SH (I'm supposed to use this ...
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1answer
81 views

How much input voltage is required to get 12v from LM2596?

I am trying to run WiFi router from a 12v lead acid ups battery. To get a stable 12v output from the battery I used LM2596. Problem is output is always 8.28v-8.50v. No matter how many times I spin ...
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0answers
39 views

How can I size the current ripple of a DC-DC converter for lithium batteries

I am designing a bidirectional DC-DC converter to charge and discharge batteries on a DC bus. The power of this converter is 50 kW and the average current in the inductor (the same as that on the ...