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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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1answer
65 views

Where does energy goes, in PWM regulator?

Consider some automotive generator plus linear regilator - it maintains output voltage just at 13.8-14.5V (depending on country ambient temp) and excess voltage is just going to extra Temperature, ...
0
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2answers
56 views

Back powering a switching regulator

It is pretty standard practice to clamp a signal to Vcc by using a diode and resistor. However, when this happens, some small amount if current (maybe ~50mA) is flowing back into the Vcc line. When ...
2
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2answers
108 views

Using a capacitor instead of inductor in a switching regulator, and viceversa

Contextualizing more: In a switching topology, and I am butchering it now, the inductor gets "charged", and eventually will keep an amount of energy "just enough" required for the load. This is ...
0
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0answers
38 views

How to account for the low voltage when designing a Step Down Switching Regulator

Datasheet: http://www.ti.com/lit/ds/slvs569f/slvs569f.pdf Design procedure: **Essentially my question is say I have an input voltage that can range from 7-15V. When designing this converter (must ...
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0answers
26 views

(Very Basic) Confused on Reading a Datasheet and Calculating Inductor Ripple Current for a switching Regulator

I am using this component for a project, however, when reading the datasheet I have just become confused about a couple of things. Datasheet : http://www.ti.com/lit/ds/slvs569f/slvs569f.pdf I am ...
0
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0answers
50 views

Choosing power supply for device [duplicate]

This question is not Duplicate I am building a device which has a Raspberry Pi 3b +, custom Atmega328-PU or AU circuit (homemade Arduino), ws2812 SMD LED Arrays. Here, Raspberry Pi will provide ...
1
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1answer
40 views

Regulate 0-6V output

I need to control output from 0-6V at max 1A (~0.8A). Looking at the datasheet for LM25010 it looks I could control R1 and R2 feedback resistors and achieve just that. Is it possible to get that ...
3
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0answers
66 views

Switching regulator not suppressing variance in input?

I am having a little problem with my switching regulator, based on a AP65211A and here is my schematic: Parts: ...
0
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1answer
37 views

Step down converter design calculation

I am using a Step Down Converterto step down 3.3V to 1.8V with a Load current of 500mA. I have an output inductor of 10uH and 1.2A rated current. I have designed my converter with the help of this TI ...
0
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2answers
70 views

buck dc dc step down with LT1054C

I built a simple circuit to produce -5V from regulated +5V but it doesn't work unless the voltage is at least +6.5V as input. The LT1054C shoud work ok from 3.5V but I measure 0V at output with my ...
2
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4answers
155 views

300VDC to 24VDC voltage converter - Cheapest implementation

In an application, 100+, 100W 24V halogen lamps need to be individually controlled and run simultaneously. They stay on for a few seconds at a time and need to have very constant irradiation. ...
1
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1answer
26 views

Selecting switching regulator components based on cost and performance

I'm designing a PCB which requires 3.3V and 9V power regulation. Eventually I plan on building a fair amount of these boards, so I want to plan my design so I'm able to buy components in bulk if ...
2
votes
1answer
90 views

Will a buck converter allow current to pass through if Vin is less than the configured output voltage?

In general, will a buck converter allow current to pass through if Vin is less than the configured output voltage? Specifically, I'm reading the TPS54308 datasheet and I'm not seeing an answer to my ...
1
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0answers
41 views

Buck/Boost Regulator Problems (TPS63070)

Questions: 1.) Why do input voltages of 9v and higher cause the regulator to output voltages in the range of 1.2v to 2.0v instead of the configured 3.4v if a load is connected to the output when 9v ...
0
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0answers
38 views

Switching regulator high frequency ripple

I've built a switching power supply with a TI 16006Y IC. It seems to be doing its job correctly however I'm having trouble getting rid of the high frequency ripple that occurs for a short period every ...
0
votes
1answer
49 views

What is the purpose of a schottky/zener couple on an isolated flyback topology?

This isolated flyback topology has been generated by TI's webench. It's a classic schematics with a feedback going through an optoisolator. There are, however, two diodes connecting the switching ...
4
votes
1answer
361 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
36 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
60 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
67 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
53 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
votes
2answers
92 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
58 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
votes
3answers
184 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
94 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
56 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 ...
1
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2answers
106 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
votes
1answer
74 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
174 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
66 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
146 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
107 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
212 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
votes
2answers
63 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
64 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
vote
3answers
359 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
42 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
votes
2answers
248 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
49 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
166 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
vote
1answer
352 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 ...
1
vote
0answers
56 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
251 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
84 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
89 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
1k 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
votes
2answers
70 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
votes
1answer
83 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
votes
2answers
172 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.