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Questions tagged [switching-regulator]

It's a type of voltage regulators that rapidly switch a series device on and off.

4
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1answer
344 views

Feedback in LM2574

I wonder what is the purpose of 'R66' at the feedback terminal of LM2574? I have seen its datasheet but I cannot find info about this. Instead of a single resistor there is a voltage divider shown in ...
1
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0answers
32 views

Thermal Faliure of thermal overload protected ICs

I have encountered a number of instances now where ICs that supposedly include "thermal overload protection" will still heat up until they fry. Examples: LM338,LM2576. These devices datasheets ...
0
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1answer
28 views

Help converting PSPICE .lib with multiple subcircuits to LTSPICE

I'm trying to convert an unencrypted PSPICE buck converter model (http://www.ti.com/product/LM2678/toolssoftware) from TI. I translated the top subcircuit based on these steps: https://www.analog.com/...
1
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2answers
37 views

MC34064 Step-Up Regulator Design

I have a 7.4V battery supply which will gradually discharge and reduce until at about 5V I won't have enough power for my device anymore. Ideally, I need to maintain a 7V (+/- 0.5V) supply rail ...
0
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0answers
45 views

Boost converter output voltage error

I'm using LT3494a to generate 37v from 6v input. This is my circuit. According to the datasheet, this chip can provide up to 40v output, so it should be able to generate 37v. Also, the simulation ...
0
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2answers
84 views

LTC3624 regulator won't regulate

I am using LTC3624-3.3 regulator, with components as in the datasheet app notes - 12 V Vin, burst mode, 10 uF at in, 47 uF at out, 2u2 inductor rated at 2.3 A... At no load, voltmeter says 3.34 V. ...
1
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1answer
56 views

Buck converter inductor calculation doesn't agree with typical application schematic

Im trying to play around with some buck converters and have found one that I might want to make a circuit with. The IC I want to use is the the TPS53125 in QFN package. It's a dual output buck ...
2
votes
1answer
42 views

Choose a dc-dc step up boost regulator [closed]

I'm designing a circuit that runs on a single cell LiPo battery and I'm trying to choose a proper dc to dc step-up regulator. My circuit needs about 2A maximum. I searched a lot and found so many ICs....
6
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3answers
170 views

Configuration of Multiple Buck Regulators on One PCB

I have been doing a lot of switching regulator research for a board design that uses two buck regulators on the PCB to get 9V and 3.3V out from a 12-28V DC supply. The majority of my questions have ...
0
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2answers
93 views

What impacts the cost of switching regulator

I am selecting a 3.3V output switching regulator (to power the MCU, LEDs, and some ICs) for a project and I am noticing that even after specifying a specific list of parameters that I am looking for ...
0
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2answers
51 views

Alternatives to Large Transformer or PSU for Driving DC Heater

I have a 3D printer heated bed, instead of 3d printing I want to use it for reflow soldering. The bed is intended to operate at 70c, using 12v or 24v. It can be wired in series or parallel depending ...
0
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0answers
26 views

Need help in designing circuit with LT1959

I have to make a regulator circuit with 4V output using LT1959 switching regulator. Its mentioned on page.2 of Demo manual below DC356 circuit diagram] that "MOVE D3 TO POSITION D2 FOR OUTPUT ...
1
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2answers
96 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 ...
0
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1answer
71 views

Lead Acid battery switching regulator to keep constant output

I am trying to use this ups design(below image)(max 500mA) but I want to use switching regulator instead of linear regulator to keep regulated Vout as constant possible even when battery drop below ...
1
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2answers
163 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 ...
0
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2answers
59 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 ...
2
votes
1answer
109 views

Reducing ripple from switching regulator

I'm assembling a PCB and have only the power supply section installed, shown below. The input (VIN) is 9V from bench power supply and output (VCC) is 5V. During testing I measure 4.86V on the output ...
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2answers
94 views

Negative voltage regulator with up to 100 mA current

I want to reverse a board and design a similar one. It is written on its negative regulator eadrfo (in some cases eadrbc). I ...
0
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2answers
159 views

Reduce supply from 4V to 3.3V

What is the simplest and cheaper way to have 3.3V 0.5A from 4V? I'm developing a board which uses a SIM800 so it must have 4V 2A power input from 24V external power supply (I'm using a LM2596S adj, ...
0
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2answers
62 views

Is it really the Power required for comparing input and output?

Hi I want to drive a 5W (5V*1A) output... Can it be carried by a 10W input (15V*0.670A) ? Is it just the power needed? Or should I need a larger current than 0.670A ? Is this applicable for LDO ...
0
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2answers
43 views

How to compute dissipation of switching regulator considering the input?

I want to use a 5V 500mA to my circuit, also this will have a current spike for 1A. The input will be from 9V - 36V. I have reviewed the difference between the linear and switching regulator and ...
1
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3answers
246 views

Negative input, negative output switching regulator?

I've got a component within a larger device that requires both +15 and -15V, drawing about 100mA per rail. In addition, the main power supply of the larger device is providing +/- 28V, with a common ...
0
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0answers
40 views

Switching Power Supply Issues

The below picture is the power supply part of a board from a vendor. We keep having issues where the PIC being powered by it will randomly go back into bootloader. While we don't know for sure we ...
0
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2answers
220 views

No Output From LM2596-5T from TI. Any Ideas Why?

So I built a board with LM2596-5T as the voltage regulator. Below are my schematics.Just as described in the datasheet. And the layout is as below: After assembling, the output is at 0V. Vpin12 is ...
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votes
1answer
48 views

Electric Coded Switch

I want to create a lighting system that uses a push electric switch that is coded to a specific bulb in a how. When I push 00000001 it lights bulb 00000001 and when I push 0000010 it lights bulb ...
0
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0answers
137 views

Cheap bench power supply noise

I'm having some trouble with a "cheap and cheerful" bench power supply that I become an owner of. When scoping the outputs I'm seeing some really high noise peaks (see attached photos) in the region ...
1
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1answer
278 views

3.3V Buck-boost converter outputting voltage too high

I'm using a buck-boost converter RT6150B with fixed 3V3 output. I followed their application notes, and here's my circuit setup: Note: I used 22uF for C4 intead of the recommended 20uF for output ...
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0answers
54 views

Stable 12V 1.5A

I'm in need of a stable 12V 1.5A power which I could carry with myself. One way of doing it would be to strap, say, 12x 1.2V rechargeable batteries and use LM317. But then I read about buck ...
0
votes
3answers
193 views

Effect of switching frequency in boost regulator with switching load

I have an objective to make a pulser for ultrasonic 1Mhz and 120V, for step up DC i used a boost converter with switching frequency 10KHz, 0.9 Duty Cycle and 12V supply, the boost converter work ...
2
votes
2answers
65 views

Capacitor for Transient

I am designing a board for my project which is powered from 4.2V Li-Ion Battery. I am using a buck-boost converter ADP2504 for powering the board which outputs 4.0V constant voltage. I have buzzer on ...
0
votes
3answers
76 views

Do switching regulators usually require a lot of external components?

The DE2-115 Altera FPGA development board uses "LM3150 Wide-VIN Synchronous Buck Controller" to generate two supply rails: 1) 1.2V/5A from a 12V rail 2) 3.3V/6A from a 12V rail These switching ...
0
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2answers
989 views

Why PWM Does Not Regulate Voltage Across MOSFET?

I am trying to control a DC voltage using pulse with modulation (PWM) and an N-channel MOSFET. The way I have set up the circuit is as follows: However, instead of the motor I have a 100K resistor, ...
0
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2answers
66 views

Why is this Type I compensator phase not 270 degrees?

This is a Type I compensator with a pole at origin. The transfer function between \$V_{in}\$ and \$V_{out}\$ is as follows: $$ \frac{V_{out}}{V_{in}}= -\frac{R_{2}}{R_{1}+R_{2}} \frac{1}{s (R_{1}|| ...
0
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1answer
69 views

Inverting regulators and sinking current

I have a circuit to drive a simple resistive load, and it works quite well. On the high side is 2.5V from a regulator, and the low side is 0V (taken as reference to a battery's negative terminal which ...
0
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2answers
151 views

AC analysis on transient model of Buck converter

I'm unable to understand why can't we run AC analysis on a transient model of Buck converter.
0
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1answer
38 views

Equivalent one-output of a SIMO converter

The single-inductor multiple-output (SIMO) converter below is a dc-dc converter with one input, one inductor and n outputs Vo1, Vo2,..., Von and load currents Io1, Io2,...,Ion. Is there any theory, ...
1
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1answer
125 views

Can I get 2 AA to provide 4+ amp pulses at 5V?

I can find plenty of circuits that can boost 1-3V to 5V at low 200mA ranges, but nothing that would allow for a powerful burst, like IR remote at high power, needing 30-50ms pulses of 4A at 5V, then ...
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1answer
53 views

Will a laptop works with missing GPU Power rail? [closed]

I have a skylake laptop with a dedicated graphics, the Mosfets on the buck converter are shorted (at least one of them) so if i cut the 1v gpu power rail will the laptop works again? Thanks in advance....
3
votes
1answer
369 views

High Step-up Ratio DC-DC Convert (12V-to-150V) - Boost, Flyback, Coupled-inductor Boost?

I am trying to design an on board DC DC converter that generates 150V from a 12V input. I'd like to design it to handle at least a 30-50mA load, but in reality the load will most likely be smaller. ...
1
vote
1answer
139 views

Buck converter LM3671 acting as a (weird) voltage follower

I am making a circuit which has buck converter LM3671 inside: http://www.ti.com/lit/ds/symlink/lm3671.pdf Schematics are attached at the bottom of this post. In real application, power source is 3xAA/...
1
vote
1answer
42 views

How does MPPT algorithm and 2-stage battery charging go together?

I understand that for finding the MPP of a solar panel, the PWM of a switching converter needs to be regulated based on an algorithm. And that if a battery is connected to the converter the output ...
0
votes
1answer
189 views

RHP zero with a positive phase shift

All books and references I read say that RHP zero gives a negative phase shift. I can infer that by plot the phase of the function \$w_{z}-s\$ where \$w_{z}>0\$. With this function, when frequency ...
4
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6answers
1k views

Does output voltage of a boost converter depend on load current in CCM?

In the thread below, there are different opinions whether output voltage of a boost converter operating in continuous conduction mode (CCM) depends on load current or not. Boost Converter Output ...
0
votes
1answer
143 views

Average Inductor Current in RL Charging Circuit

Here's a switching circuit. The input Vs is a 24V rectangular pulse at 20kHz frequency with 75% duty cycle. Since the time constant L/R is very much greater than the pulse width, we expect the ...
0
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2answers
132 views

Reducing heat dissipation in linear current source used for driving a LED

I'm currently using a linear current source to drive a single LED as in here. In my case (following the notation in the link), VDD is directly connected to a single cell lithium polymer battery, i.e. ...
4
votes
1answer
352 views

Switching Voltage Regulator Problems

I'm new here, so forgive me if I breach any forum protocols in the asking of this question. I have designed a voltage regulator scheme for a guidance system on an aerial drone. All components ...
0
votes
2answers
451 views

SMPS (LM2678) what transformer to use and why?

I have made a few power supplies in the last year (only linear ones using voltage regulators). I have always used a big simple step down transformer, from 230v down to 12/24v (depends on the supply i ...
0
votes
0answers
279 views

Simple high-side load switch for grounded loads with linearization stage

I want to design a very simple high side switch, using components already present in the bill of materials of a larger project. I do not want to choose special components, but just try to re-use what ...
-1
votes
1answer
453 views

How to adjust output voltage of boost/buck converter ic's?

I've been looking to create a circuit with variable voltage output. I've looked at linear regulators such as the LM317 but this cannot handle higher currents so I turned my attention to switching ...
-1
votes
0answers
161 views

lm2587-ADJ switching regulator

I built a circuit based on "Increasing Available Load Power in an LM2587 Boost Regulator" app note. The difference is my input is around 24VDC, the output I want is 28VDC. So at output the resistors ...