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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Buck IC (XL4015) feedback logic

The datasheet for the XL4015 has the following information about the feedback loop: The threshold feedback voltage is 1.25V The switching frequency is 180Khz If the feedback voltage exceeds 3.3V, the ...
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Is there such thing as a tunable DC/DC converter? [closed]

Note: I am not an electrical engineer. I am quite removed from the field so please bear with me. I have run into some electrical modelling projects which suggest that a DC/DC converter can be used to ...
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24V to 5V step down voltage regulator with LM2678

Reference: https://www.ti.com/lit/ds/symlink/lm2678.pdf I have constructed the circuit above attempting to step down the DC voltage from 24V to 5V. But I keep getting 8.3V as the output voltage. It is ...
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Wide range power supply accepting both AC and DC from 12 to 240V [closed]

What is the "common" way to build such a source? I have seen time relay CRM-93H that can be powered by "AC/DC 12-240V (AC50-60Hz)". I failed to find any IC or transformer in it, ...
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DC-DC converter circuit LM5164

I would like to build a DC-DC converter circuit using EasyEDA that can output about 8 V from 7 Nissan Leaf battery modules that are about 55 V nominal. I am looking at the datasheet for the LM5164 and ...
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Photovoltaic solar cell attached to load device

I am new to the field of power electronics so please bear with me. From what I understand, photovoltaic cells are often connected to a DC/DC converter and a MPPT power system that allows for (1) ...
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TPS61230A efficiency [closed]

I'm working on a project that uses Raspberry Pi Zero powered from Battery. So, I'm using a DC converter to have 5V for Raspberry (~5.2V to avoid dropout). The Rpi do some IA calculus. As per the ...
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UCC3895DW FOR PSFB?

I am designing a 3KW CC/CV (60V 50AMP max) power supply and I choose UCC28951 PSFB controller but this part is out of stock and I can't get it so my question is can I design a 3KW power supply on ...
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2 answers
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Sizing the DC/DC inductor for only momentary high currents

My DC/DC setup is going to power a GSM modem. The behavior of these modems is that they typically consume only a few tens of milliamps, but when transmitting they are drawing 2A for microseconds. On ...
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Isolated DC/DC converter to power ADC

I have a circuit with an ADC (Adafruit ADS1115) at the end to measure a voltage. I want to make this ADC into a DC island to avoid ground loops and noise, so I will use an isolated DC/DC converter to ...
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Dual Active Bridge Converters - ZVS

I am studying DAB topology which is summarized in a Texas Instrument paper At page 14, at the Zero Voltage Switching I read about this explanation: During the transition from interval one to two, ...
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Equivalent DC Circuit Model of Power Converter

This is an extract from the book 'Fundamentals of Power Electronics' - Erickson At this point in the book, they are trying to derive the equivalent DC circuit model for a boost converter. To do so, ...
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Sepic converter [closed]

Can I convert any boost converter to sepic? I want to convert ME2199 into sepic for which I will add an inductor and a capacitor. The schematic is for 12 V boost. If I want to convert 15 V to 12V, ...
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Why don't we make negative output voltage like this?

Here you have a buck conveter where Vout1 = D*Vin which is positive for positive input voltage. I'm wondering why don't we just reverse the connection of output ...
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DC/DC Converter not outputting the correct voltage

I have the following circuit for the LT3463A regulator: https://www.analog.com/media/en/technical-documentation/data-sheets/3463f.pdf I started testing the board, for the negative voltage I was ...
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Phase Shifted Full bridge converter transformer design

I am designing a transformer for a phase shifted full bridge converter for voltage up conversion. My main concern is the efficiency, I am trying to reduce transformer loss to less than 5%. The total ...
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Is it possible to get constant 12V from USB PD?

I am interested in using Power Banks to get a 12V constant power supply. From the USB-C Specification, I get this figure which shows that it is impossible to get 15 V with insufficient sink current. I ...
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Feedback circuit for implementing CC/CV in DC/DC switching circuits

My goal is to design a 10s lithium battery charger with the ability to vary the output current depending on what power adapter is used. For this I want to use the LTC3786 boost converter and the ...
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Checking calculation of phase and gain margin in LtSpice

I am currently studying DCDC stability analysis in LtSpice. Could you please check my phase margin calculation, am I right? And how about the gain margin calculation? Is it equal to infinity in my ...
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Buck converter exam question [closed]

Is my solution to the problem correct? Also this was asked in a internship exam and we had no buck converter in our syllabus. So can this problem be solved intuitively without knowing anything about ...
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How to reduce NPN reverse base current on this interesting "Super Efficient Joule Thief"?

Note: The question part is the fixing of the negative current at the transistor base. It looks like there's a problem with negative current at the LED(s) -- this is not expected to be answered in this ...
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TFT-LCD VCOM powered by LDO

Is it possible to generate VCOM voltage for TFT-LCD display by LDO? I am considering using MAX16929 for generating AVDD (9.6V), VGL (-6V), VGH (18V) and VDD (3.3V) for touch controller, but remaining ...
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How does a switching regulator behave if its input is equal to its output?

I want a switching regulator (eg LM2596) set to 5v output voltage to work with 5V - 36V input voltage. I know regulators have min dropout voltage. So how does it behave in such a case (Vin=5V when ...
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How to calculate waste heat dissipation from a DC-to-DC-to-DC conversion

I am wondering how I can calculate the total combined heat dissipation (in watts) by two DC-DC converters in the following scenario; In my case, I have a project where I have 12 volt DC, which gets ...
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2 answers
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Fixed vs adjustable DC-DC converter

When choosing a DC-DC converter like the LM2596, does it matter if the output voltage is fixed or adjustable? Until now, if I need a fixed 5V output, I've chosen to do it using a constant 5V regulator....
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How do I design a buck converter for battery charging?

I am familiar with the process to be followed to design a buck converter for voltage step-down applications, where the load is modelled as a resistance, however, I do not understand how one can design ...
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DC voltage attenuation

I need to attenuate 0-5V to 0-1 mV. The output of simple voltage dividers (normal op amps or resistor divider) can't be distinguished from baseline noise (baseline noise is 10-20mV.) How can I ...
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Reliable constant current DC/DC converter [closed]

I am looking for a CC converter to charge my lithium battery. Most DC/DC converters with CC/CV are Chinese made with very poor reliability. I need something like this to convert 8-15V to 15V CC at ~5A....
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MC34063 24VDC to 5VDC [closed]

I am trying to set up a 24VDC => 5VDC converter using the MC34063. The schematic is as follows: I used the following component values: C1 = 100µF C2 = C3 =150µF C4 = 100nF C5 = 0.47nF L1 = 150µH ...
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Voltage divider, linear regulator, other options to power proportional HV DC-DC converter?

I have a EMCO AG15P-5 DC-DC converter (datasheet) that takes 0-5V in and outputs up to 1.5kV (proportional to input voltage). I need to operate the converter at 500V output. I've done testing with a ...
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Bias voltage higher than input voltage

Can someone explain why the voltage on the Bias pin should be higher than the input voltage n this LDO? What is the reason behind it? Why is the bias voltage on different pin? For what purpose? How ...
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Questions regarding analog compensator

Consider the following analog compensator for a DC-DC converter. Vo is the DC-DC converter. FB is the feedback voltage. Vref is the reference voltage. It is expected that $$ FB = V_o\frac{R_4}{R_4 + ...
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Highest Efficiency/Lowest resulting heat from a DC/DC conversion

I have a 336VDC power source - it's a pretty unique piece of kit and won't be changing it. I'm looking to power around 500W of equipment from it at 48VDC. However, I'm looking to do this using a DC/DC ...
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3 answers
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Cannot amplify DC voltage using op-amps

I am trying to amplify a DC voltage scaled from 5-10V to another DC voltage with maximum 12V. Why I am not using just a DC voltage with that value? Because the input DC is variable according to some ...
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Picking components

I'm an electronics student and I'm currently working by myself on a DC-DC booster converter. By now I have already completed the simulation, and I'm currently selecting components in order to go make ...
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Biasing PIN Diode with HV DC-DC converter, HV return to ground?

In the circuit below, the HV_RTN shares ground with the other components. Are there any precautions that should be taken when grounding it this way? I figured some sort of noise filtering would be ...
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Is a full π-type EMI filter needed in front of an isolated DC-DC converter with long input cables?

I want to use a 5-volt-to-5-volt isolated power via an isolation DC-DC converter, the Aimtec AM1/4S-0505SZ. This is a very small DC-DC with Vin: 4.5—5.5V Vout: 5.0V Iout: max 50mA fSW: 80 kHz ...
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Output load current less - DCDC Converter [closed]

I'm using this Boost converter. 3.6V to 12V with a load current 300mA. 10uH is the inductor used. But I am only able to get a maximum load current of 120mA. What might be the reason?
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DC-DC Converter voltage drop on load [closed]

I bought a DC-DC converter to charge my devices with the 20V 1Amp current of my solar panel. I set it so it would convert to 5V but when I connect to load the voltage drops to 4.7V or less depending ...
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How to calculate components values for LM3421 in SEPIC mode

How can I calculate the components values for LM3421 in SEPIC mode? In the LM3421 datasheet, there is not much information about SEPIC topology. (Section 9.2.9.2 is labelled "Detailed Design ...
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Should I use a DC-DC converter or an LDO?

In my project, I am designing a board which is supplied by a battery. The battery is a LiPo, 3.7 V, 1000 mAh, so its voltage range is 3 - 4.2 V. All the components on the board need a fixed voltage of ...
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Power supply design requirements for IGBT driver

I'm trying to determine the proper power supply type and output current requirement to drive a three phase IGBT driver (this is a follow up to a previous question I asked, although focused on a ...
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Dealing with inrush current - input resistor?

I've got a circuit that's having problems at startup with inrush current, leading to large spikes on VCC (parasitic inductive of the power supply / leads etc) that sometimes results in smoke coming ...
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IMVP9 Controller VID/SVID protocol PU resistors

I'm using MP2940 IMVP9 Controller for VCCIN (CPU Power Rail) and VCCIN_AUX (PCH Power Rail) for a motherboard that includes Intel Tiger Lake UP3 Processor. VCCIN Controller uses SVID protocol and ...
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How can I measure the output of a voltage booster circuit?

I made this circuit, which was described on-line as a "transformerless Joule Thief." I was able to light four LEDs of varying forward-voltage in series, but I couldn't figure out how to use ...
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RLD + RC Snubber for MOSFET

I'm currently making a DC-DC SMPS power supply that converts 331VDC (rectified from 240VAC) to 60VDC with a maximum output current of 10 amps. I've asked once on this forum about a general problem on ...
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The switch pin of boost converter seems to pull down the input voltage

I'm designing a circuit to convert the 3.7-4V Li-ion battery output to a steady 5V DC power supply. The boost-converter I chose is a synchronous boost converter SGM6611C with a fixed switching ...
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Connecting the grounds on a non-isolated DC/DC converter

For isolated DC/DC converters, I know that it's a good idea to have two different grounds on both sides and that we should avoid to connect the two grounds together as the isolation is useless when ...
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DC-DC converter fault output

We have a design using 4 EM2130L02QI dc/dc converter all with very similar routing and component placement. the output gets shorted to GND and never changed . the same board that contain with another ...
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The source part of an IRF540N transistor

So, I have built a DC-DC booster using an IRF540N as my transistor, according to the following schematic diagram. It did work and I had a 18V output from a 1.5V battery. The transistor is connected ...
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