1000 Threads found on edaboard.com: Switching Power Supply With 7805
The frequency of your switching action is very low . and it is not good . you should try to increase that , up to 40KHZ or more . thus the value of capacitor and inductor will become to the lowest .
and what is your input voltage ?
is important to you , the isolation ?
Power Electronics :: 02-05-2012 04:56 :: goldsmith :: Replies: 4 :: Views: 438
Maybe you should consider 30VA (or slightly bigger) step-down transformer and step the mains voltage down to, say, 25-30Vac then normal stuff: fuse, bridge and smoothing cap ..
After that you can use the LM2575ADJ (or similar) switching step-down converter .. Google for it's data sheet with applications ..
Analog Circuit Design :: 03-22-2007 01:54 :: IanP :: Replies: 1 :: Views: 1093
I want to build a 1000V/10mA switching power supply with 220V input (single phase). I am looking for a schematic of a similar power supply or something close to help me to find out how to start.
Analog Circuit Design :: 05-14-2008 02:54 :: steve_rb :: Replies: 5 :: Views: 1309
I want to build a 2500V/10mA switching power supply with 24V/10A input (Battery).
please help me about transformer and switching circuit!!
Analog Circuit Design :: 05-04-2009 19:13 :: tictac :: Replies: 5 :: Views: 1472
Is there anyone experienced with 7805, which input is supplied by switching power supply ? I use +12 V from regular PC power supply. Just now, it went broken. Is it wrong to use switching PS for 7805 input ?
Analog Circuit Design :: 08-20-2007 14:05 :: JaMe :: Replies: 1 :: Views: 1217
i have 400w switching power supply,but i have a problem of the noise around 100khz and 300khz
pleas if you have any solution for that problem to move this switchin frequencies to moor the 4 Mhz .
I think if you want to reduce noise
use Switch_regulator + Linear Regulator
Analog Circuit Design :: 12-28-2003 08:20 :: andy2000a :: Replies: 7 :: Views: 1571
A 13.8-V, 40-A switching power supply.pdf
Hobby Circuits and Small Projects Problems :: 02-11-2003 05:03 :: 0levanhoc :: Replies: 1 :: Views: 3398
This 'simple' step down converter is one of the most expensive I ever seen. (1977 it's ok, but today too expensive)
This regulator has a poor efficiency. I think the losses in the switching Darlington transistor are > 10W. So you are in need to cool it well with a very expensive and BIG heat sink !!! A mechanical disaster.
Modern concepts are
Analog Circuit Design :: 05-30-2004 05:16 :: felix1200 :: Replies: 14 :: Views: 18318
switching PS with variable o/p is very much possible.
Chane the reference voltage of the error amplifier to vary the o/p voltage.
Analog Circuit Design :: 09-12-2004 21:23 :: bimbla :: Replies: 6 :: Views: 2920
I want to design a step down switching power supply ckt with following specs:
I'm new to power supply design, so please provide me information related to standard techniques, circuits and components.
Analog Circuit Design :: 04-28-2005 08:14 :: kuldeep :: Replies: 4 :: Views: 1892
the switching power supply tech.
what are the advantage and disadvantage??
Analog Circuit Design :: 06-02-2005 04:59 :: starchern :: Replies: 3 :: Views: 813
For a mass production project I'm looking for a switching power supply manufacture , who can manufacture a power supply with the following abilitys:
power supply unit Fully tested & certified
universal input -> 5V@1A MTBF 250000 Hour 25 c (...)
Business, Promotions, Advertising :: 12-17-2005 07:55 :: bobcat1 :: Replies: 2 :: Views: 1168
I am designing power supply using 7805 to get 5V for Microcontroller use, but at the same time I am using LM298 to control motor by the microntroller. If my power supply from the transformer output is 6V, 2A, can the 7805 stand for this 2A current. As my knowledge, it will burst up! How (...)
Analog Circuit Design :: 01-30-2007 00:24 :: Js_Ong :: Replies: 2 :: Views: 3226
I need a switching power supply (SMPS) for a digital circuit, with following specifications. What is your offer?
The offer may have lowest price or lowest components count or highest efficiency.
1) Input Voltage: 5-12V
2) Output Voltage: 3.3V
3) Output Current: 200mA
4) Isolation: NOT needed
5) Protections: NOT needed
Electronic Elementary Questions :: 05-14-2007 06:17 :: leotim :: Replies: 4 :: Views: 1436
Both are same
SMPS Switch mode power supply
SPS switching power supply
Analog Circuit Design :: 06-22-2007 00:26 :: vaibhav.k :: Replies: 5 :: Views: 1038
switching regulator (higher efficiency):
Linear regulator (a lot of heat):
Analog Circuit Design :: 01-25-2008 17:08 :: IanP :: Replies: 18 :: Views: 2125
it depends what level of short circuit protection you want.........
there are 2 levels....
1. Converter stops switching in the event of an output short circuit.
.....some PWM controllers have ways of detecting this and "do it for you".
2. Load is switched off when short circuit happens.
Power Electronics :: 04-09-2009 12:28 :: eem2am :: Replies: 1 :: Views: 3513
I have a switching power supply 12v 50A, it runs perfect but the problem with that is it produces a loud whistling sound when a load is attached to it, I know that sound comes from a Transformer bcz of high frequency switching, is there any way to suppress this noise ??
Electronic Elementary Questions :: 11-16-2009 05:40 :: hameeds01 :: Replies: 8 :: Views: 3041
I have bought a MeanWell 3.3V switching power supply but when I measure (with a multi meter) the voltage is gives 18 volts. (Measuring over the V+ and V- poles). Is the unit malfunctioning or am I doing something fundamentally wrong?
Power Electronics :: 05-18-2010 19:22 :: edwinost :: Replies: 0 :: Views: 648
1.1.1 Start-up Phase
As any member of the VIPer family, VIPer22A has an integrated high voltage current source linked to
Drain pin. At the startup converter, it will charge the VDD capacitor until it reaches VIPer startup level
(14.5V), and then the VIPer22A starts switching.
1.1.2 Auxiliary supply
VIPer22A has a wide operating voltage range f
Hobby Circuits and Small Projects Problems :: 09-10-2011 12:27 :: themes1 :: Replies: 3 :: Views: 3462
Is it typically bad practice to run multiple MOSFETs in parallel to handle the load current of a switching power supply? Are there any tricks to performing this safely?
Power Electronics :: 06-06-2011 18:56 :: BlackHelicopter :: Replies: 4 :: Views: 1797
Take a look at these tutorials
National Semiconductor Linear and switching Voltage Regulator Fundamentals
On Semiconductors Linear & switching Voltage Regulator Handbook. HB206/D
Analog Circuit Design :: 08-04-2011 08:52 :: alexan_e :: Replies: 8 :: Views: 1426
I have a doubt about the operation of a switching power supply and I would appreciate your feedback.
Suppose that we have a transformer rated at 1A , we are using a full wave bridge and a capacitor and suppose that the rectified output is 12v DC.
If I use a switching regulator (like LM2576 or LM2676 etc) but (...)
Power Electronics :: 11-21-2011 08:44 :: alexan_e :: Replies: 11 :: Views: 1065
I have a small electronic device with speaker. Device is powered by standard, general purpose impulsive AC/AD power adapter (12V, 1A). When I first powered it up, I heard a switching noise from speaker. Then I tried my Lab power supply, there were no angry (...)
Power Electronics :: 07-17-2012 10:34 :: tantudaisu :: Replies: 4 :: Views: 1600
Hello , I have idea make switching power supply with variable output voltage , for example 2-50V 100W.
For simplicity, let's say we used TOP271 from TOPSwitch family.
On picture is design for 50V 3A PS designet with TOP271, with whom I replaced one winding 12V from an (...)
Analog Circuit Design :: 12-11-2012 10:46 :: Astrid :: Replies: 5 :: Views: 1156
I would like in switching power supplies controlled TopSwitchJX (flyback) replaced the error amplifier with an external reference.Suggest you consult as compensation network, gain, etc.?
Basically my point of replacement TL431, operational amplifier and a fixed reference point I used the DAC to control the output voltage of the source.
Analog Circuit Design :: 01-03-2013 10:11 :: Astrid :: Replies: 0 :: Views: 266
I would like input chokes for switching power supply 200W transformer wound on a ferrite core.
I have 2 sector core E2005 with ferrite CF138 Al=1350 nH (ungaped core).
It is good idea for make 2x10uH EMI suppressor?
Analog Circuit Design :: 01-08-2013 07:11 :: asrock70 :: Replies: 2 :: Views: 368
I understand the basic work that a switching power supply does, but I am a total noob in this field and I am unable to build one from scratch and I'm not even able to evaluate if any scheme found on Google is OK or not.
I'm looking for a switching power supply to power 108 (...)
Power Electronics :: 05-02-2013 09:27 :: T3STY :: Replies: 7 :: Views: 919
What topology would you recommend for switching power supply
- input voltage 230V
- output voltage 2-50V
- output power 0-200W
If appropriate half bridge.
There exist a more modern version TL494?
I have a proposal hlaf bridge power supply experience, so I would welcome a circuit in which (...)
Analog Circuit Design :: 05-05-2013 22:01 :: goldsmith :: Replies: 10 :: Views: 617
On 2001-05-01 23:18, Rfboy wrote:
Hi, I'm looking for a project or information about a switching power supply with these caracteristics:
- Input : 110-260 Vac
- Output : 48 Vdc 18 A
put your email i will send you pdf files.
Professional Hardware and Electronics Design :: 05-03-2001 05:02 :: haymeron :: Replies: 14 :: Views: 5936
I'm lookin for a project of a modified PC AT switching power supply so that its modified voltage (0 - 30V) is made variable.
Any help is welcome!
Professional Hardware and Electronics Design :: 06-26-2001 10:38 :: 2000 :: Replies: 0 :: Views: 2100
50 kV is not a standard isolation for production power supplies(2 kV is more like the isolation limit of mass produced supplies). You will have to make it yourself. I suspect that you will have to use air core transformers and high switching frequencies.
An alternative is to get a mains transformer used to power the lights on AM (...)
Professional Hardware and Electronics Design :: 02-24-2003 12:09 :: flatulent :: Replies: 4 :: Views: 1328
I'm going to make my own switching power supply. Does anyone have schematic ? any help is welcome ! :)
Hobby Circuits and Small Projects Problems :: 08-30-2003 11:29 :: khanh :: Replies: 5 :: Views: 5060
Reduce track area and length which are switching,( drain to power inductor and diode) the ground can have a big plane.
I think 4 layer board is overkilling, it will only increase the cost.
Professional Hardware and Electronics Design :: 10-23-2004 01:38 :: rauol :: Replies: 9 :: Views: 1606
I am developing a power supply with two floating outputs. Each output is opto isolated from a control board. The pcbs are in a metal case. My problem is that when I use a scope, connecting the ground lead causes a glitch on my ground causing the opto to switch. Any ideas how to stop this.
Analog Circuit Design :: 05-10-2005 17:57 :: wossy :: Replies: 2 :: Views: 888
Does anybody have information about:
VARIABLE switching power supply?,
i need information about it, but i haven't found neither papers nor
books; please upload information about it, or tell me a web site where i might find information about it.
Analog Circuit Design :: 07-08-2005 10:09 :: Volt :: Replies: 2 :: Views: 1881
your answer is word "switching".
because of fast switching it can make some noise such as electromagnetic noise.
it noise can effect on some systems.
Electronic Elementary Questions :: 10-21-2005 22:53 :: hr_rezaee :: Replies: 8 :: Views: 1157
about switching power supply:
Analog Circuit Design :: 10-27-2005 16:10 :: ARTMehr :: Replies: 21 :: Views: 4069
I´d like to know if you have any schematics or info/tutorial on how to make
a DC power supply with universal AC input, 50~60Hz and 100~240V.
Thanks in advance
Professional Hardware and Electronics Design :: 01-31-2006 06:41 :: Rafael :: Replies: 3 :: Views: 1956
I would like to know some hw did bode plot was plot for L5973d switching power supply module. I would like to know if i could calculate the Fc and phase margin using tranfesr func given in the data sheet
Analog Circuit Design :: 06-12-2006 08:14 :: danesh :: Replies: 3 :: Views: 1998
anybody who knows how to construct a simple, low cost, effecient switching power supply good enough as bench power supply for hobby projects.
Professional Hardware and Electronics Design :: 12-12-2006 23:52 :: emavil :: Replies: 2 :: Views: 2450
Hi all, I'm new here. What is valley switching power supply?
Analog Circuit Design :: 04-09-2007 20:05 :: munich1806 :: Replies: 1 :: Views: 744
here is a link
Analog IC Design and Layout :: 04-23-2007 04:16 :: mists :: Replies: 1 :: Views: 801
i have to design a switching power supply(flyback converter)and i need help to design transformer and control circuit.
Electromagnetic Design and Simulation :: 06-18-2007 11:11 :: ashein :: Replies: 2 :: Views: 697
What is Off-line switching power supply? and
What is soft start switching power supply?
Electronic Elementary Questions :: 06-20-2007 22:45 :: wisepie :: Replies: 1 :: Views: 1300
There is a good book out there: A.I. Pressmann, Switch-Mode power supply Design.
There is another book: K. Billings, switching power supply Handbook.
You can also go to the TI website and download the Unitrode power supply design seminars. You will find enough material (...)
Analog Circuit Design :: 06-25-2007 12:39 :: VVV :: Replies: 5 :: Views: 1605
Can anyone tell me wich chip should I use for isolated 220v to 12v switching power supply. (20-40w autput power)
Analog Circuit Design :: 12-30-2007 04:11 :: tomikan :: Replies: 2 :: Views: 1649
Can anyone help to me for this power supply circuit ?
switching power supply (+ or -9V , 3A) output
Use 7809 and 3ohm resistance
Analog Circuit Design :: 01-11-2008 12:25 :: Nahian :: Replies: 5 :: Views: 1882
hi to all
i need advanced information in desingning a switching power supply
Analog Circuit Design :: 01-17-2008 04:38 :: ashein :: Replies: 1 :: Views: 511
I want to build a power supply with 240VAC and the output should be 12V,60Watt. Do U all have any good reference site for me. Or any book or ebook.
Analog Circuit Design :: 09-02-2008 04:57 :: yunus_cansys :: Replies: 1 :: Views: 553