Questions tagged [switching-regulator]

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

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10
votes
3answers
11k views

Low side N-Mosfet buck converter

I often see schematics of basic buck converters. The majority of these schematics use a P-Mosfet as high side switch. Why is this design preferred over a low side, N-Mosfet buck converter? simulate ...
9
votes
7answers
3k views

Why are switchers more efficient than linear regulators?

It is well-know that switching regulators are more efficient then linear regulators. I also know that linear regulator have to dissipate the difference between the input voltage and output voltage ...
2
votes
3answers
2k views

What is the advantage of a switching over a linear power supply?

I want to build my own switching power supply. I already know how to make a 10 Ampere Linear supply, and I'm wondering if I should bother. What do I have to learn to do a switching supply? What makes ...
4
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6answers
3k 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 ...
8
votes
2answers
7k views

How to control a buck-boost converter circuit from a microcontroller?

I'm reading about buck-boost DC-DC converters lately and one thing is still not very clear for me. Most of the converter ICs that I've seen have a feedback loop input pin. For example LTC3780 requires ...
1
vote
2answers
85 views

Voltage Mode Control

Since i started my training about design of DCDC I'm really confuse with control part. At school i learned that DutyDycle=Vout/Vin for Buck, and that's it. But now, i see that, Duty cycle is set ...
1
vote
1answer
106 views

LM2678 PCB Layout question / review

After my initial question about switching regulators I had decided on trying to use an LM2678 for an adjustable/variable voltage form 5-24V and 5A max with an input of ~30VDC. The application will be ...
0
votes
2answers
834 views

Shut down regulator during sleep

I'm working on a wireless sensor network and would like to know what it would take to shut down the regulator during deep sleep. MCU: STM32L151C6T6 Regulator: TPS63001 Radio: RFM69HW LCD: some ...
6
votes
3answers
449 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 ...
5
votes
1answer
670 views

Switching regulator enable pin low, but output isn't fully off. Why?

I'm working on a battery-powered application using two Texas Instruments switching regulators and a Linear Technology pushbutton power controller: I have confirmed that when I push the button and ...
3
votes
1answer
350 views

LTSpice SEPIC design low freq ringing

Further to the SEPIC design I asked about in LTSpice SEPIC simulation current spikes, I have a new problem. The output voltage is OK and the inductor current waveform looks much better but the ...
2
votes
2answers
1k views

LM2575 switching regulator - ideal inductor and COUT sizes

I'm developing a PCB in Cadsoft Eagle as seen in the brd and sch files as per the links below: Eagle schematic file Eagle board file See the images below for screenshots of the schematic and the ...
2
votes
3answers
3k views

How to achieve the max efficiency from a Buck converter

I have a question about switching step-down regulators. (As I stated in my previous questions, please consider the fact that that I'm not very expert, so feel free to reply/talk as if I were a student....
2
votes
1answer
181 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 ...
1
vote
3answers
619 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 ...
1
vote
1answer
143 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 ...
1
vote
3answers
8k views

DC-DC Converter vs Switching Regulator

As an example, lets say I'm looking to convert 24V to 12V for a circuit that draws 800mA. I understand that a standard linear regulator is going to dissipate 9.6W so is out of the question here. So ...
1
vote
2answers
185 views

LT3663 regulating low

I have a simple LT3663 circuit that I'm using to regulate 15v down to 13.8v. ("24v" is actually 15v in, and "15v" is 13.8v out.) This works almost perfectly. It current limits properly, etc. However, ...
0
votes
1answer
96 views

Power supply for micro(3.3) and LCD(5)

I am designing a board that has an LCD and msp430fr2433. They both need 5v and 3.3v respectively. So I decided to use TPS560430X3FDBVR and TLV70033DSET to provide 5v and 3.3v. I have attached the ...
0
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2answers
58 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
votes
1answer
109 views

Horn disturbs controller and lcd on common power source

I have a 60V battery which feeds a PCB itself switching down the voltage to a 12V bus and then from 12V to a 5V bus using two consecutive TI TPS54560 switching regulators (5A max current). I have a ...
0
votes
3answers
236 views

Best design choice: linear regulator or switch converter

I need to power a Thermoelectric module with 10A maximum load current. I'm designing a card with a minimal design in order to change the current or the voltage across the load, given a standard ...