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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 converters, etc)

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DC-DC converter to make variable output +/-70V from 5V input

This is a SEPIC DC-DC architecture from Texas Instruments to make a variable output from +/-5V to +/-70V. Iwould like to understand the principle of how the negative voltage is being made from the ...
Andromeda's user avatar
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Bipolar 15 V DC from 9 V DC

I’m looking to get a regulated ±15 V DC @100mA minimum from a 9 V DC source. It’s for an audio circuit, so it needs to have a switching frequency well above audio range, and it needs to have a small ...
Connor Moore's user avatar
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How to solve the problem and what is the main problem in DC to DC converter [closed]

I want to make a DC to DC converter using optocoupler BJT and MOSFET. Firstly use RC coupling circuit, then the output goes to MOSFET. in that case everything is alright. But when I add optocoupler ...
Hasibul Hassan Mobin's user avatar
3 votes
1 answer
82 views

Level shift a digital 1.8V signal to split supply rail, using BJT

I have designed a DC/DC converter (based on Zeta technology) that will generate a split supply with a single buck controller and coupled inductor. The controller's GND pin is the negative output. ...
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DC-DC converter design simulation tools and Webench design tools to identify the best-suited IC and schematic

I did a research about what are the simulation tools and webench tools for major companies like AD and TI to find a effective tools for my design purpose: For example for Analog Devices, there is the ...
Andromeda's user avatar
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2 answers
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Does this DC-DC converter model require an external switching signal?

I looked at the datasheet TPS62742. It says that there is a required input DC voltage and it looks like an output voltage is produced but it says "sw" which I thought was where the switching ...
the_circuit's user avatar
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DC-DC convertor SEPIC architecture [closed]

I am currently developing a SEPIC converter to convert a 4V input to a variable output ranging from ±5V to ±80V. For this project, I have selected the LM3488 from Texas Instruments. After conducting ...
Andromeda's user avatar
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RCD snubber loss in flyback converter

I have few queries in analyzing the curves. Below is the flyback converter with RCD snubber circuit and waveforms. When the FET is turned ON, there is no primary current flowing through snubber as the ...
Komal's user avatar
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1 answer
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DC-DC SEPIC convertor design

In a reference design form Texas instrument for a SEPIC architecture: I noticed there is a specific consideration for connection between HVGND and PGND for LM3488 as follows: At the same time that ...
Andromeda's user avatar
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1 answer
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DC-DC convertor-SEPIC architecture

I'm working on a SEPIC DC-DC convertor, in the reference design from Texas instrument there is MOSFECT which is derived by DR pin of the main controller (LM3488) as follows: There is an diode (D4), ...
Andromeda's user avatar
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2 votes
1 answer
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SEPIC DC-DC converter

I want to do the layout for a SEPIC DC/DC converter as follows: In the datasheet of the driver LM3488, they have recommendation for layout, which means the traces should be as short as possible for ...
Andromeda's user avatar
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DC isolation - 3 separate circuits with same power source and shared I2C

I am trying to build one small project and based on the needs I need to isolate few components but also keep them connected using I2C. I was doing a research and found few DC DC isolator converters ...
Peter Bašista's user avatar
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1 answer
53 views

Can i connect two DC-DC buck converters 48V>24V in parallel to increase the current? [closed]

can i connect two DC-DC buck converters 48V>24V in parallel to increase the output current? I have one 20A already but it shuts off by overload. The Load is sometimes 30A so im considering to ...
ginta's user avatar
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5 votes
5 answers
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How does MPPT maintain a constant voltage?

I have a slight confusion in the working of the MPPT algorithm in solar inverter. I am confused about how this converter maintains a constant 310V (required for H-bridge) with MPPT. MPPT is a maximum ...
kam1212's user avatar
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2 votes
3 answers
218 views

DC DC boost giving high voltage , minimum quiescent current

My dc-dc gives 25 V on load instead of 5 V, Arduino calculator shows similar values for 3 V supply. Supply is 3 V 2 AA batteries. Led blinking ON for 100 msec OFF 900 msec, current 150mA The intended ...
Hars's user avatar
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2 answers
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Calculating junction-to-ambient temperature rise for switching MOSFET

So I'm looking at datasheet's since I'm looking for a N-Channel MOSFET for a DC-DC Buck Converter that will be switching at 1.2MHz. Since the MOSFET will be used as a switch for the Buck Converter, I ...
J. Street's user avatar
3 votes
1 answer
189 views

LM2675 outputs wrong voltage, not sure about layout

I'm making an ESP32 board to control some 12V outputs, so I got an LM2675-3.3 buck converter IC (datasheet) to power the MCU. This is my first time designing and soldering a PCB and I'm guessing I may ...
Axl Vang's user avatar
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53 views

Middlebrook Stability Criteria for Input Filter

I am trying to apply Middlebrook input filter stability criteria for Active clamp forward converter .So for finding Input filter output impedance over the frequency range is quite straight forward in ...
Power Path's user avatar
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Periodic Voltage and Current Fluctuations in Autonomous Robot System

I have an autonomous robot system powered by a 24V LiFePO4 battery that has several distributed PCBA's getting their power from the 24V battery, and also having their own on-board DC-DC buck ...
Sam's user avatar
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1 vote
1 answer
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Average Model of Peak Current Mode Buck Converter

I am trying to understand average model of Buck Converter for Peak Current Mode Control Topology. Below is a snapshot taken from the Christophe Basso Webpage, from file “PWM Switch LTspice: Mark ...
Power Path's user avatar
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How should I come up with a power supply for 5 motors, one micro-controller (ESP32) and one microprocessor (Jetson Nano) for an object sorting arm

I am trying to design a power supply for a robotic arm with 5 servo motors(2 are MG90S and 3 1501MG motors). I'm planning to use an ESP32 microcontroller and Jetson Nano. I have the option of using ...
Baraka Seth's user avatar
0 votes
2 answers
63 views

TPS65131 inverting dc-dc overshoot

I am trying to make a ±12 V power supply with a TPS65131 DC-DC converter. The positive rail looks just fine, but the negative rail overshoots to around -12.7 V and then slowly recovers to -12 V, then ...
sx107's user avatar
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Why are these transformer windings used connecting the switch and the series pass regulator in this circuit?

I am looking into this multi-output forward converter and cannot figure why these highlighted windings are connected to the switching side. There's already an inductor to handle the recovery reset. ...
drnzd's user avatar
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1 answer
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Peak Current Mode Control Buck Converter Slope Compensation Info From datasheet

I am working on Buck Converter design based on LT8642S controller and trying to do average modelling ,so I contacted manufacturer regarding slope compensation info and they responded below. "The ...
Power Path's user avatar
0 votes
1 answer
99 views

Buck Converter Peak Current Mode Control Average Model

I am trying to understand average model of Buck Converter for Peak Current Mode Control Topology. Below snapshot taken from Christophe Basso Webpage(https://powersimtof.com/Spice.htm) from file "...
Power Path's user avatar
1 vote
3 answers
76 views

Do I have to place a gap in the GND plane to reduce noise from DCDC?

In the past I made few designs with switching power supplies and I'm aware about the needs to keep traces short and with low impedance (i.e. where possible use filled zone instead of tracks) and to ...
Mark's user avatar
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1 vote
1 answer
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Earth protection in PV + battery system

I'm building a system that looks like this: PV -> solar charger (48 V) -> batteries (48 V) -> isolated DC/DC (48 V->12 V) -> non isolated DC/DC (12 V->3 V) -> load The PV's are on ...
user362085's user avatar
0 votes
1 answer
58 views

Darlington NPN preregulator for LDO step down 42v to 12v ~ transistors keep blowing up

this is a follow-up from the original post about this circuit which can be found here. the purpose of this circuit is to reduce the voltage to a lower level that is more palatable for the LDO. and it ...
ManeGote's user avatar
2 votes
2 answers
61 views

Two switch forward converter with transient spikes on gate to source voltage - Part Deux

This post is about a similar problem seen in this similar post This 2 switch forward unit has a 750V input, 72 volt output and was tested at 10 and 15 amps out. This new board doesn't have the ...
decook1110's user avatar
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32 views

Current sensing in DC-DC converter

I studied DC-DC converter in peak/valley/average mode control and I have a question about the methodology to sense the current in average current mode control. I saw lot of paper about DCR sensing but ...
AnalogMan's user avatar
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1 vote
1 answer
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DC-DC(Buck) shuts down when LDO enabled (intermitent)

I've encountered a problem on SOME of the boards in pre-production batch, when the boards main 5V rail generated by a buck dc-dc converter shuts down at the moment when one of the loads generated by ...
MMG's user avatar
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3 votes
1 answer
42 views

Mode selection for Boost converter

I am currently working on a problem for designing a boost converter. Below are the parameters that are used for the calculations. Vin = 180V, Vout = 360V L = 25 μH, Operating current is 15A and the ...
Manish k's user avatar
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2 answers
57 views

Control multiple LM2596 with just one potentiometer

I have 20 of the cheap buck convertors (LM2596), On my boards there's this blue potentiometer on it which adjusts the output voltage very conviniently. I wanted to use 20 of these buck convertors in ...
Roland Thsive's user avatar
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44 views

Two-way analog signal converter

To begin with: I have almost zero electrical/electronic knowledge. I want to have something like two-way analog signal converter. On one side there is 0V-15V and on the other there is 0V-3.3V. The ...
Jakub Chromiak's user avatar
2 votes
2 answers
78 views

Are unregulated charge pumps used in some applications?

As we see in SMPS converters that feedback is necessary to regulate the output. Here charge pumps are both regulated and unregulated converters. I am curious to understand in which applications ...
Komal's user avatar
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1 vote
1 answer
60 views

How can I protect a DC/DC converter when VIN is floating?

I'm using a L6902 (https://www.st.com/resource/en/datasheet/l6902.pdf) to charge a 4 cell lifepo4 pack (with a solid BMS). Do I need a diode on the converter output (PACK+) to prevent the converter ...
alexlroemer's user avatar
3 votes
2 answers
291 views

Correct Implementation of Flyback Diode, TVS Diode, and Snubber Circuit for Buck Converter?

I am fairly new to circuit design. I was wondering if I have correctly implemented the TVS diode (D8), flyback diode (D6) and the snubber circuit (R20 and C41) for this buck converter. I apologize in ...
NickRand's user avatar
1 vote
1 answer
63 views

Analysing 42v to 3.3v DC converter circuit & component identification

I'm analysing a circuit responsible for generating 3.3v for a stm32f103c8t6 on a battery management system(10s). Its a completely proprietary battery management system with nothing online about it so ...
ManeGote's user avatar
2 votes
0 answers
25 views

designing power supply using LNK306DG [closed]

I am designing a converter circuit using LNK306DG and I have done this earlier. Now I have to swap the phase and neutral pins of the circuit, and what should be the changes I have to make in this ...
Aakas Pulikkal's user avatar
1 vote
3 answers
105 views

Kapton instead of air gap (ferrite core)

I'm working on a flyback converter topology and I want to create a 1 mm air gap in the ferrite core transformer in order to decrease AL. I didn't find one with air gape, I heard of a solution that is ...
Noureddine Bimgdi's user avatar
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0 answers
48 views

Multiple output DCDC flyback

I am struggling to come up with a viable design with a minimal BOM for a low power DCDC converter and would appreciate some thoughts. The input is 24v/48v (PoE PD) with multiple output rails: 12v, 5v ,...
Neil's user avatar
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0 votes
1 answer
26 views

6V 3W solar panel and to charge phone through a DC converter XL6009E1 via a 12V 2A car charger [closed]

I have a 6V 3W solar panel and want to charge phone with it, i have tried a dc converter XL6009E1 via a 12V 2A car charger it shows charging but battery power did not increase I am scared of using the ...
Godfrey DonShawsky's user avatar
3 votes
1 answer
211 views

Boost converter does not work according to the theories

I am still a beginner in this field so I would like to gain some insight about boost converters. I wanted to build a boost converter for a school project with this simple design. The parts were ...
Ian's user avatar
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1 vote
1 answer
34 views

How do the switches and level translator work in the LMC7660 Switched Capacitor Voltage Converter [closed]

This is the block diagram of Texas Instruments LMC7660: Here 4 switches are used S1 to S4. The diagram shows source connection of only two transistors S1 and S2, and leaves out the S3 and S4 switch. ...
Newbie_Programmer's user avatar
3 votes
1 answer
66 views

A question of control of flyback converters

Considering control of flyback converters, is it possible to control a converter which has pure current load (configuration on the picture)? Does it have to always be purely resistive load, because I'...
usernamenenad's user avatar
1 vote
1 answer
84 views

What conditions create subharmonic oscillations in switching converters?

I have been thinking that any time you're in CCM with a duty cycle greater than 50%, you can enter subharmonic oscillations. Is this only for current mode control, or is it voltage mode as well?
Michael Beckwith's user avatar
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0 answers
33 views

Anomalous behaviour of a DC-DC booster with LT3461A

I am building a circuit based of the CosmicWatch project, however I had to rebuild the circuit as I'd wished it to be integrated with other systems. However, powering up the circuit (4.5Vin) instead ...
La Pancake's user avatar
0 votes
1 answer
56 views

Calculate Li-ion discharge time for two different loads, one after the other

Battery: 2S (2 cell), 7.4 V nominal, 3000 mAh, and 8C max. CC LED driver: TPS92691 LED string 1 (in series): I(f) = 1.5 A CC @ V(f) 17 V As simulated through WEBENCH, the input current required at ...
roaibrain's user avatar
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0 votes
1 answer
52 views

LTspice AC/DC converter with DC/DC boost converter

So this is my first time using LTspice and I need to convert my (AC) Vin 11.5V to DC and then boost DC voltage to Vout 22.5V. I have a few givens and some I needed to calculate. I am struggling to ...
Richard Lewis's user avatar
0 votes
1 answer
52 views

Circuit design for adjusting the electrical load of a small wind turbine (MPPT)

I am trying to make an MPPT controller for a small homemade wind turbine. The goal of the project is the MPPT itself and its performance. The application is direct water heating, and there are no ...
leheim's user avatar
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