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344 Threads found on Switching Regulator
can i connect lm2576 in series ?? I have 27 volt supply,i need 24V,12V and 5V can i connect 3 lm2576 in series like 1st one gives me 24v, which feeds 2nd lm2576 and gives me 12V and so on...
hi all, am confused whether to use an linear regulator or a switching regulator. my input is an 24v power supply from an smps , my output reguirements are 5v 100ma max. am confused whether to go with a linear or a switching regulator as linear regulators dissipate more heat , but the (...)
Hello all...I learned that in searching for diode substitute the faster switching time is the better. But the problem i am not able to see where from diode datasheet i can find the switching time. Example diodes are U1JC44 and 1N4006. Anyone please help...thanks a lot/.
But i want output current was 50A. That's a huge current, maybe you want 50mA ?? There are many buck/boost converters (linear and switching regulator) which you can find on
Hello all, I have received an Edimax 8-port switch from my sister that most certainly fed it 12v on its the 5v input... (I cannot guarantee that, but based on the damage I suppose that happened.. or maybe the PSU failed - I got no PSU). The problem is quite straight-forward, there is a smd in a very strange package which is burnt. I took a pi
Hi there, I was trying to figure out what are pros and cons of powering an ADC directly off of a switching regulator. This application report from TI, SLYT366A, seems to be quite helpful. However, there was a paragraph there that made me a bit confused. On the page 5, it talks about
I see that you decided to build your own discrete SMPS controller. Which is supplied by a 4 volt regulator. Which means that at M1's gate, you'll have a driving voltage of about 3 volts.....Will M1 be fully enhanced with such a low gate drive? Also, you don't mention switching frequency. But if you are switching above 100 Khz, X17's slew (...)
Supplying the LED driver from linear voltage regulator is a bad idea in terms of efficiency. TPS61500 has 18 V input range, so it can be operated from 12V input as well. It sounds that switcher input peak current is exceeding 7805 current limit. If a 47 ?F capacitor solves the problem, it's a reasonable solution. I presume there will be still sw
Any regular power supply with 110-250V range will handle this.
Hi, Many switchin regulatur IC manufacturers have interactive selection guides on their internet sites. Use them. It's difficult to recommend "the one" out of thousands switching regulators without knowing details about your application. Klaus
You you want some sensible power output, you should use a mosfet. They are not really expensive any more and they are well suited for switching applications. You can use a BJT if you wish a linear regulation (e.g., a series pass regulation). There are plenty of introductory books on this topic and most are excellent for the beginners.
Your circuit looks like a parallel resonant converter without the secondary. Also, i do not see any primary current sensing. Your circuit also reminds me of a fluorescent ballast driver, but where the fluorescent tube would be, you have an inductor. But then again your controller is fixed frequency , and some variability of switching frequency is
switching supplies in TV's often go into a hick-up mode for protection if there is an excessive load due to a fault somewhere.
How can this power supply possibly work. It is called a Stacked switching regulator. It is an non isolated topology that uses 208 V 3 phase for an input and an output of 3.3 KW, 330 VDC at 10A. It's claim to fame is that most of the power passes directly through from the 3 phase rectified line to the output. The regulation is handled by a sma
Hi all, I am working on improving electric installation on older type KTM motorbike, and there is this nasty permanent magnet alternator giving out AC ranging from 20V up to 70V depending on RPM. The idea is to make switching step down regulator that takes this type of input and give out 13.8V for charging just regular Pb accu and running other a
Beadboard is OK for linear regulators, but this is a switching regulator & need very careful PCB design. You can't expect to get output from a switching regulator with this lengthy wires & connections. The inductor position & schottky diode positions are most important to make this circuit to working. Even (...)
I can't help with the required laser power although 300mW sounds rather weak to me. The driver IC should work fine though as long as the current is < 1A. Take care with the other components, that kind of switching regulator is fairly critical of the type of inductor and capacitors you use. If you folow the data sheet exactly it should work well an
Hi, How can i calculate the maximum switching frequency of mosfet irfz44 from the datasheet.
If your application doesn't need 5V, it would be more appropriate to convert to 3.3V in the first level, particularly if you plan to use linear regulators. You should have a rough idea about the current consumption of each power net, e.g. by using the Altera power estimation tool, to decide if linear regulator are accpectable. Starting from a
Hello Guys! I am wondering if there is one SUPER switching power supply regulator which is able to provide in one chip: 1.2, 1.8, 2.5 and 3.3V from an input voltage of 24v?? If this is not so. Can anyone tell me a reference power supply low noise module (and not overheat also) to supply a cyclone IV FPGA? Thanks
This is basically a continuous Buck regulator switching oscillator than regulates the pulse width for an average DC voltage across Vbe controlled by D1 zener voltage , Vbe and Ie*Re and duty cycle. Offline buck designs have improved over this and work in principle like active PFC to provide a sinusoidal current fluctuating aro
When disconnecting a switching power supply from the main circuit board to isolate and troubleshoot the switching power supply circuit board. All switching power supplies needs a load even when disconnected from the main circuit board. How do you find out what load value to use to test and troubleshoot a switching power supply?
Many informations missing for a meaningful answer , type of regulator (switching or linear), involved bypass and filter capacitors, duration of "spike". Quite generally, a spike doesn't enforce a static current rating, you'll rely on pulse current capability of components. E.g. fuses have a trip charcateristic in datasheet.
A better Bang for the Buck (intended pun) is to design a low voltage drop linear regulator after the buck SMPS which maintains the constant low voltage drop, while the linear regulator minimizes the ripple and has the benefit of current limit control down zero with wide BW ripple rejection and low step-load regulation error. In the old days Lambda
Thanks for the quick reply Skyguy. Much appreciated. Will design a simple CC ckt and see if it works. BTW with the switching ckt, is the configuration of the P channel MOSFET good? Or will I need a pull down resistor from the gate to ground? Overall' would the ckt work with the switching the way I want? Suggest modifications if any. Thanks!
Don't care about the phase near switching frequency and above. The system can't be described as time-continuous and analyzed with bode plot in this range. The results above 50 kHz are effectively meaningless for stability analysis. The basic problem is that you have no phase margin according to bode plot. Step response is respectively bad. You s
I'm doing a little research on Power Supply design books... I'm trying to build an old school analog synthesizer and all I'm used to seeing are the big transformers, the diode bridge, supply and filtering caps and lastly a voltage regulator... but then in others I see sense lines, zener diodes... all sorts of other stuff I don't know why or when to
A separated power ground and ground plane can help to keep commutating currents inside the power supply region. But it's adavantage can be easily dwarted or turned into drawback if you reinject the switching noise along with the input and output power lines between both regions. We have to look at filter inductors and placement of bypass capaci
I have a switching regulator that operates at switching frequency of 260Khz that steps down a 28vdc to 3.3Vdc. The switching regulator output will supply current as high as 1 amp for the initial 5 minutes on power up then it falls off to several mAs. Can you please suggest an input and output filter that (...)
Hi , Friends What is switching regulator for negative voltage I need part number same as lm2576 but for negative Voltage also i need 3 ampere in output . There is -48 VDc and i should , change to - 12 VDC. thanks
But is there any other factors I'm not aware of that a high switching frequency would impact? And then I would like to use a as high as possible value inductor, what is it that determines the maximum inductance that can be used? Suppose you wind an inductor which you plan to make 100 uH (a typical value). In reality it might tu
Your report says that the 24V switching power supply hasn't sufficient current capability to drive the motor. Not related to relay, PIC etc. You can easily check by connecting the motor to the power supply directly.
The ic should be cheap and easily available. ALL ICs are cheap and are readily available HERE, but I do not know about in your country. Maybe you should ask on a forum in your country. Simply go to the website of your electronic parts supplier and search for the part you want. I go to the website of my
If this is connected to the switching regulator above it, the datasheet lists a Schottky power diode,D1?3A, 40V Schottky Rectifier, 1N5822
You need a boost(switching) regulator. Or a DC-DC converter. You don't give us any specifications. Like current.
Hi I need to select the DC common mode filter. Basic inputs are DC voltage = 24VDC Current= 0.5A switching frequency of regulator (24VDC to 5VDC)= 768KHz Kindly suggest it Thanks pskb
The power supply to the modem module is specified as 3.2 to 4.8 V. You surely don't want to supply 9 or 12 V directly to the module. The reference circuit in the hardware manual uses a LM2596-ADJ switching regulator in front of the module.
Hello, I have got a question about how to calculate the current flowing through the feedback path of a voltage regulator. Is the solution as simple as saying that current flowing through resistors R1 and R2 equals to the voltage output divided by the total value of the resistance (R1+R2)? 109802 What will be the curr
Dear Friends , I would like to know what is the best way to drive the contactors for switching on/off motors using mcu , optocoupler etc. Recently i tried to drive 2 contactors using 2 relays driven by the mcu.The description of ckt is as follows : 2 windings from transformer : a.)0-9 & b.)0 -14. a.) Driving the 7805 regulator for running m
You can go with mc34063 switching regulator, for above 10 mA current. As of my knowledge charge pump can invert Vin=-2Vin, and max Vin = 5.5 V
I have task given to design power supply of 1.8V from 5V. using TSMC 0.35um process. I don't know the TSMC 0.35 process. Is it same as TI PMIC switching regulator?
Net 'Vout" connects to the output end of a switching regulator(called LM3478). Net 'FB' connects to the FB pin of LM3478. as you known ,the FB pin will always be 1.26V in refer to the ground and the voltage between the cathode and the node is always 2.5V. Now i want to figure out the range of the 'vout' through adjusting the potentiometer and how
You can use a switching regulator like LM2596 You can get a module from ebay for about a dollar 106612
105997 it's a 24VAC to 12VDC circuit. One side of diode bridge goes to the input the LM switching regulator, and the other side goes to the ground? Is that correct? The 24VAC goes to the diode bridge also. I use 100uH for the inductor but some circuit I have seen they use 10uH. If My output current needs to b
My inductor standard for similar applications would be Wuerth PD series, e.g. 74477126, Farnell 1635916. It's 12x12 mm shielded SMT. similar types available from various manufacturers. LM2575 is a first generation "simple switcher" IC. It's cheap, but the low switching frequency involves respectively large inductor and capacitor values. But it h
Use the switching regulator or dc-dc charge pump convertor like MCP1252 etc. You can also use linear drop out regulator like LM series. zener diode will work too but heat dissipation will rise. But, if you are worried about the transient and spike protection, simply use metal oxide varistor or diode bypass circuit to power lines. Hope that helps.
u have to add a current limiting resistor between diode and ground if u want to limit the current to zener and prevent overheating. Put the value of resistor which will not cross your zener max reverse current specification. If this zener diode is used for power supply, i suggest using switching regulator for very small impedance and leakage curren
Hi, first: don´t be afraid of the switcihng technique. It works well. Most important is the layout design. short and wide traces, good power plane, multiple vias to gnd, use ceramic capacitors and good quality inductors. there are ready to use step down switching modules as pin compatible replacement for 78xx. If you want to build your own, th
Hello All, I have an application where a sensor updates its output periodically with a small 8 pin PIC MCU and it runs well. I will be running this application with small coin battery or pencil cell for 3V. The overall current taken at any time does not increase beyond 1.7mA. So, do i need a switching regulator to save power to let the device run
Hello, I am trying to design a voltage regulator with the following spec: Input - 16VDC unregulated Output - 12VDC, 1.5 Amp and 9VDC, 1.5 Amp (either one output will be used at a time not both) I think a linear regulator will not work good for me at full load, so I would like some help in designing a switching (...)