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Questions tagged [switching-regulator]

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

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29 views

Pwm DC output smoothing

I'm in the process of assembling a big 25Ah 4S (16.8 v when fully charged) battery pack. The plan is to multi-purpose that to different DC output voltages so the PWM choice felt natural. Now I want ...
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12 views

BGA package LTM8064 switching regulator thermal management Consideration

I'm using ltm8064 for an application which required 24V, 4 amp output which causes 7W of heat dissipation. In the datasheet thermal resistance of junc to case(bottom) is 2.2 c/w and junc to board in 6 ...
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48 views

Switching regulator layout advice - MAX15062A

I am about to place an order for my PCB to be fabricated. The switching regulator is the thing that is making me most nervous about not working correctly. It is only a low power regulator with 3.3V, ...
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2answers
77 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. ...
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1answer
54 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 ...
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1answer
36 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....
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47 views

Can I connect switching regulator's EN pin directly to the car's ignition?

I am developing an electronic circuit that will be installed in a car and I'm wondering how I should properly turn the regulator on from the car's ignition (ACC) using ENABLE pin. I'm planning to use ...
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1answer
108 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 ...
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2answers
90 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 ...
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2answers
49 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 ...
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25 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 ...
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2answers
88 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
67 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 ...
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2answers
152 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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2answers
46 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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1answer
77 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
87 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 ...
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2answers
137 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, ...
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2answers
61 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 ...
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2answers
39 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 ...
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3answers
162 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 ...
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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 ...
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2answers
193 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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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 ...
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0answers
110 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 ...
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1answer
226 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
51 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 ...
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3answers
157 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 ...
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2answers
59 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 ...
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3answers
65 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 ...
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2answers
790 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, ...
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2answers
62 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}|| ...
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1answer
62 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 ...
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2answers
135 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.
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1answer
36 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, ...
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1answer
119 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
51 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....
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1answer
255 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. ...
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1answer
124 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/...
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1answer
41 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 ...
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1answer
163 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 ...
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6answers
858 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 ...
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1answer
134 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 ...
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2answers
117 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
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1answer
310 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 ...
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2answers
373 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 ...
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220 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 ...
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1answer
353 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 ...
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0answers
144 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 ...
4
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3answers
363 views

How to select step-down converter chip? [closed]

I have some limited amateur-level electronics experience, but I'd like to try something new to me. I'm trying to design a small PCB that among some other fairly simple components will house a DC-DC ...