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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33 views

switch-mode power supply

First post here. I'm making a DC/DC converter which will generate an output of 19.5V 18A. Its a synchronous buck converter with the LM5145 TI chip. When I have light load on the converter the output ...
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109 views

Buck Converter dies unpredictably upon connecting power

I made a PCB for an ESP32-based solenoid controller that is powered by a 24V DC Jack. I'm using an AP63205 Buck Converter to step that input down to 5V DC, and then a linear 3V3 LDO to power the ESP32....
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TL5001 based buck converter from 12V to 5V…MOSFET is getting hot

I am using TL5001 PWM controller IC to build a buck converter with the following specs: Input voltage = 10-14V, typical 12V Output Voltage = 5V Output current = 1A Output voltage ripple = 50mv ...
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67 views

A multi rail dc to dc power supply circuit design; thoughts and recommendations

I am trying to design or put together a multi rail dc to dc power supply circuit using Texas Instrument webench power supply. My input for this power supply will be 12V and I will have 5 hot ...
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60 views

Boost converter increase current

I have boost converter powered by 2 AA batteries (3v) which increases the voltage to around 40v. I have a 12v zener diode to cap the output to 12v. Regardless of the zener diode when I connect a strip ...
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Bidirectional Cuk and Sepic/Luo Converter

I am looking for sources that explain the bidirectional Cuk converter and/or bidirectional SEPIC/Luo converter. I searched the internet for 7 hours today and did not find anything that explains them ...
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55 views

Why do most electronic circuit designs require power sources with negative output? [closed]

I was going through this article and it said Most electronic circuit designs require power sources with negative output Why is this so? Moreover, I also found that the main disadvantage of a buck-...
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sepic converter using lm3478

Is it possible to make a sepic converter of 120 W using LM3478 ? I am trying to make the circuit in TI web bench but it is not supporting over 12V 3A in LM3478.
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49 views

How to choose appropriate DC-DC converter for Electric Vehicle battery charging application?

I'm currently working on a project which requires building an EV battery-charger as a starting point. At present, I wish to design it for a 220 V, 50 Hz grid source input. The nominal voltage of the ...
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2answers
83 views

When should ESD Protection Diodes be used?

I'm working on a heated glove project that uses a Buck-Boost converter to step-up/step-down the voltage across the heating element. This is something that has just occurred to me, but I'm not sure if ...
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47 views

How to validate an SMPS transformer?

From UCC28950 webench design data I have approached a vendor for making a transformer for Phase shifted Full Bridge DC -DC converter. Now before giving order to vendor, I want to gather data on how to ...
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27 views

How do I get a lower/higher voltage from a cuk converter?

By definition, "The Ćuk converter is a type of DC/DC converter that has an output voltage magnitude that is either greater than or less than the input voltage magnitude" So I was wondering how I can ...
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Level shifting between SD Card and Lipo-powered microcontroller

I have an ATtiny861 microcontroller powered directly from a Lipo battery. My circuit is designed to operate on supply voltages from 3V - 4.2V (bonus if it tolerates up to 4.6V). I need to interface ...
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Fixed Frequency Control of Multi-Resonant Converters

I am currently designing a SMPS based on the half-bridge LCC converter. Due to my application, it is desired to operate the converter at a fixed frequency. I also wish to optimize the passive ...
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Powerled driver

Wht is the best way for operat 10w 10v led , what is the max current in 10v , how much ohm resistor i must use, Can i just use a dc_dc booster to increase 3.7 volt to 10 v and connect it straight to ...
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Light load efficiency of DC-DC Switching converters

I have been working with DC-DC Converters theoretically. What is it that I don't understand is that how the efficiency is very less at light loads? How does the switching and the output get affected? ...
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85 views

Massive pk-pk ripple on output using isolated DC-DC converter module

I'm having a very odd issue using an integrated DC-DC isolated converter module. As the module stabilizes, a massive pk-pk ripple is developing on both the output and the input. At first we thought ...
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107 views

Power electronics DC DC converter question: What is the function of the capacitor and resistor connected between two series inductors?

This is a power electronics DC DC converter question: What is the function of the capacitor and resistor connected between two series inductors? This is part of the schematic from a photovoltaic ...
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101 views

Why boost converter burns with large output capacitor? [duplicate]

In this circuit, the boost converter burns each time at start up and SW becomes connected to GND. Then I just removed 10V , 220uF tantalum capacitor at the output and the problem solved. In the ...
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122 views

What is Pass Transistor?

What is pass transistor?. How does it work?. while reading about the DC-DC converter, I came across Pass Transistor.
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Is there a problem using electrolytic (polarized) capacitor as coupling capacitor in SEPIC converter?

I found this circuit from here and have been thinking about to build it: The author present it as Ćuk converter but I understand it as SEPIC, after reading this and this. Q: My main concern is, ...
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54 views

Issues selecting circuit for powering the design

Device is having several power rails, sourced from the ATX power supply. Right now I am using 5V (main logic), and 12V (analog video circuits). I want to use 5V for the analog video (transistors will ...
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106 views

(THEORY QUESTION) If a diode was not placed in a buck convertor, when the switch is off would the load still be powered on?

(For Theoretical Purposes and Understanding assume the diode is not in the circuit) I just have a bit of confusion regarding the buck convertor when the switch is off. Since an inductor cannot change ...
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62 views

Loop compensation of a Buck Converter

I have a buck converter. TPS54260 Vin = 7V-20V Vout = 5V Iload=600mA. I realise that there is a similar question in this forum but I was not able to get clarity. I want to understand what do you ...
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42 views

Charge pump from discrete parts

I need to build a 2 stage inverting charge pump in order to convert a 12v rail into -24V which is then regulated to -12V using a 7912 LDO. it is used for a audio amplifier design and I need about ...
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36 views

Buck converter LC output filter contribution to phase margin

I'm trying to develop a better understanding of how my power distribution network can affect the stability and performance of buck converters, which has lead me to documents like this one. The main ...
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Pinouts for OKX-T/5-D12N-C not on datasheet

T/5-12N-C]1 12v -> 5v DC-DC converter for a project so that I can power a solenoid and a RPi with a single power source. Unfortunately, the datasheet doesn't list a pinout. There are 5 pins, and I ...
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118 views

High wattage 12 to 5 V

I have an LED project with a pretty hefty power draw - 1.5 kilowatts. We're trying to figure out how to power this from a (large) 12 V battery bank. We need to have the entire 1.5 kW output travel ...
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30 views

Limit in-rush current for DCDC

We are using a Isolated Fixed-Ratio DC-DC Converter from Vicor (http://www.vicorpower.com/documents/datasheets/ds_BCM4414xG0F4440yzz.pdf) that is powered through a 600VDC accumulator. The DCDC powers ...
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33 views

High Voltage Active Rectification using Silicon Carbide MOSFET

This is a purely theoretical question, please forgive me if I am being stupid. Synchronous rectification and secondary side control of DC/DC converters is very commonplace in low voltage, high ...
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76 views

Removing output voltage ripple in high voltage outputs

I am looking to reduce the voltage ripple on a DC/DC converter operating at 5kV. I have looked extensively on the internet and have found multiple ways to reduce output voltage ripple, an ...
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93 views

Burned Up Trace on Input Cap

I'm working on a fairly simple PCB that interconnects three arduinos. There are also MOSFETs for switching some solenoids. The system runs off of a 24V DC power supply. I was running a LM7812 voltage ...
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23 views

DC Fault Characteristics of a Voltage Source Converter

According to this paper, the three stages in the DC Fault characteristic of a VSC are Capacitor-Discharge State (Natural Response) Diode Freewheeling Stage (When source AC gets disconnected and \$...
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52 views

Sampling Frequency and Bandwidth

If i have a Buck Regulator switching at 200KHz and i want to sample the Voltage and current using OpAmp in tha path connected to ADC(12 bit). What would be the sampling frequency to measure the ...
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35 views

feedback loop component dc converter

Consider the schematics below, the switching frequency is 250KHz, So, The cross over frequency be 250/5 = 50KHz. My ADC is able to sample at 1MS/s which is good as from the SNR perspective.Now, the ...
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54 views

How to connect solar panel to boost converter

Here I design a boost converter with 5 V input and 19.37 V output and it is working very well when the source is DC battery but when the source is a solar panel with also 5 V output I ...
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79 views

Capacitor Bank Design for Electric Vehicle

Good day all, I'm toying with the idea of using a small supercapacitor bank to buffer short bursts for acceleration/regen of an electric vehicle (likely an e-bike). It seems wasteful to put a ...
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57 views

isolated vs. non-isolated DC/DC converter in PoE

I am looking at powering a PoE circuit that drives a 24V motor at 2A. I am considering the LT4275/LT4276 LTPoE++™ Controller. I noticed on the datasheet for the controller LT4275 they recommend an "...
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285 views

Why won't this charge pump supply more than a couple of milliamps?

I am trying to generate 12V from a 5V source, capable of supplying around 15mA with less than 0.5V of ripple. The circuit must use all through-hole components, and cost is an issue. Having ...
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34 views

Understanding Phase Shift Full Bridge DC-DC Converter

I am studying PSFB DC DC converter. I am a bit confused in understanding the topology. For reference of the functionality I am taking UCC28950 Controller IC's circuit, From TI which have provided in ...
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45 views

Questions regarding Gallium Nitride semiconductor devices in Switched Mode Power Supplies

I have a couple of questions regarding the use of Gallium Nitride MOSFET devices in a DC/DC converter design of mine. My topology is an LCC full bridge converter. My knowledge is not at expert level ...
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105 views

DC boost converter output voltage problem when load is connected

I have successfully finished one part of the DC converter. Now I came across a certain problem which I can't solve myself. When I didn't connect a load to the output of the dc converter, there was ...
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54 views

Ćuk Converter circuit analysis

I am confused by the current path of the Ćuk converter when it is at position one where the mosfet is conducting The circuit analysis results in the two circuits below. What is the current path? Why ...
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Transient time in buck converter

To my understanding the reactive components in a converter should not store energy over a switching period, otherwise they will blow up. An in inductor for example abides by volt-second balance, which ...
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59 views

High Voltage Planar Transformers

I am designing a high voltage DC/DC converter that is for an aerospace application and therefore I am focusing on reducing the size and weight, so switching at a high frequency possibly integrating ...
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50 views

PoE Design Question

I am working on a PoE project that calls for a power to be supplied to a application circuit. The application circuit requires ~41W (24V, 1.7A). I am exploring using PD70201 as the PD controller. The ...
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41 views

High amp multiphase buck

I am looking at designing a multiphase buck that needs to operate from a truck battery (24V) and has a constant output of upto 100amps at 24volts. We need to be able to set the exact amp draw with in ...
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103 views

MT3608 gets very hot only handle 1A

In the datasheet they mention the MT3608 can handle up to 2A however in some stress tests with a load tester it gets already very hot at 1A. It is so hot, it is impossible to touch the board, all ...
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Output voltage of NPC1403 boost converter circuit 0 during simluation

Currently, for my needs I'm trying to boost a 5v input to 15v with a minimum of 20ma current at the output. I found the NPC1403 to require my needs however, when i'm trying to simulate using EasyEDA ...
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DC DC converter simulation time slow in lt spice

Usually I can 'finagle' DC to DC converter simulations into working in a timely manner, this one has me stumped. I have done the standard gmin/abstol/reltol/cshunt combination, set initial conditions ...