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Pin 13 is VC – the supply voltage to the SG3525 driver stage. It is connected to the collectors of the NPN transistors in the output totem-pole stage. Hence the name VC.VC must lie within the range 4.5V to 35V. The output drive voltage will be one transistor voltage drop below VC. So when driving Power MOSFETs, VC should be within the range 9V to 18V (as most Power MOSFETs require minimum 8V to be fully on and have a maximum VGS breakdown voltage of 20V). For driving logic level MOSFETs, lower VC may be used.Ampli1000W 1000Wmosfet TDA7294 Ampli160W Ampli500W Ampli600W Ampli700W Ampli800W Mosfet Power Supply All Power Supply Powersupply.

Switch Power Supply 0 30 Volt 5A 12v-15 Volt 20A High Current 13.8V LM317 700w-800w-900w-smps-sg3525-ir2110/ Votl And Ampe. SG3525 Ir2110 SMPS for 2 different pcb diagram: 700w-800w-900w-smps-sg3525-ir2110-pcb.rar Short circuit. ©2017 Electronics Projects Circuits.Care must be taken to ensure that the maximum VGS breakdown voltage of the MOSFET is not crossed. Similarly when the SG3525 outputs are fed to another driver or IGBT, VC must be selected accordingly, keeping in mind the required voltage for the device being fed or driven.

It is common practice to tie VC to VCC when VCC is below 20V. Pins 11 and 14 are the outputs from which the drive signals are to be taken.They are the outputs of the SG3525 internal driver stage and can be used to directly drive MOSFETs and IGBTs. They have a continuous current rating of 100mA and a peak rating of 500mA.When greater current or better drive is required, a further driver stage using discrete transistors or a dedicated driver stage should be used. Similarly a driver stage should be used when driving the device causing excessive power dissipation and heating of SG3525.When driving MOSFETs in a bridge configuration, high-low side drivers or gate-drive transformers must be used as the SG3525 is designed only for low-side drive. Pin 10 is shutdown. When this pin is low, PWM is enabled. When this pin is high, the PWM latch is immediately set.This provides the fastest turn-off signal to the outputs.

At the same time the soft-start capacitor is discharged with a 150 µA current source. An alternative method of shutting down the SG3525 is to pull either pin 8 or pin 9 low. However, this is not as quick as using the shutdown pin.So, when quick shutdown is required, a high signal must be applied to pin 10. This pin should not be left floating as it could pick up noise and cause problems. So, this pin is usually held low with a pull-down resistor. Pin 2 is connected to VREF and is thus at a potential of +5.1V ( ±1%).

The output of the converter is connected to pin 1 through a voltage divider with resistances 56kΩ and 1kΩ.Voltage ratio is 57:1. At feedback “equilibrium”, voltage at pin 1 is 5.1V as well as this is the target of the error amplifier – to adjust the duty cycle to adjust the voltage at pin 1 so that it is equal to that of pin 2. So, when voltage at pin 1 is 5.1V, voltage at output is 5.1V. 57 = 290.7V and this is close enough to our 290V target.If greater accuracy is required, one of the resistors can be either replaced with a pot or in series with a pot and the pot adjusted to give required reading.

1) Make sure the voltage is higher than the maximum output voltage. A 400V capacitor would be good since I assume your output voltage would be lower than 330V. If it's higher than that and close to 400V, use 630V.

2) It is an electrolytic capacitor. Try to use a low-ESR capacitor.3) Unfortunately, I don't have the PCB design for this. There are many free PCB design software you can use to design the PCB yourself. ExpressPCB: Cadsoft EAGLE (freeware with limitation): PCB123: DesignSpark PCB: DipTrace (freeware with limitation): TINA: gEDA: KiCad EDA: There are other free PCB design software available as well. So, download one. Go through the manual and start using it. I've used ExpressPCB and PCB123 (a little bit of EAGLE as well).I'd say they're pretty good and certainly good enough for your purpose.

Hope this helps! Regards, Tahmid.I haven't designed PCB for this. There are many free PCB design software you can use to design the PCB yourself. ExpressPCB: Cadsoft EAGLE (freeware with limitation): PCB123: DesignSpark PCB: DipTrace (freeware with limitation): TINA: gEDA: KiCad EDA: There are other free PCB design software available as well. So, download one.

Go through the manual and start using it.I've used ExpressPCB and PCB123 (a little bit of EAGLE as well). I'd say they're pretty good and certainly good enough for your purpose. Regards, Tahmid. Anonymous Hi tahmid, your blog is awesome.I know u from edaboard. I have a project to do and now ı just need to do push pull dc to dc converter which converts 36VDC to 311VDC. I cant simulate the circuit above and also ı need to implement this circuit. Does this circuit really work?

I need a ferrite transformer but ı cant implement this circuit without this transformer.I mean should ı select proper ferrite first right? And then ı can implement this circuit. Which article should ı read on your blog about ferrite transformer calculation? My project has 1kVA output power.So ferrite transformer must be 1kVA.

My question is that how should start to implement this circuit? Because ı cant simulate it in proteus, multisim, ltspice etc. Anonymous Dear Tahmid, I've found your tutorial very helpful, especially since the data sheet of the SG3525 chip lacks the proper information, regarding the associated circuit design. For example a profound information given by the Linear Technology, which comes along their buck/boost controller chips, is poles apart different from the information misery offered by the SG3525 manufacturers. I think those guys owe you a lot of money so far, as your information serves their customers. Just one thing, IMHO, your voltage divider is slightly wrongly calculated.When you have that resistances, your actual resultant voltage will be V= 280x 1/(56+1)= 4.91V, not 5.1, hence 5.1x 57= 290.7V. But apart from that, your work is excellent.

Thanks for your efforts, just keep it up, I wish you all the best, mate, Alex, Krakow, Poland. (Temporarly in London, UK).

Hi, The internal circuitry of the SG3525 is such that the outputs of A and B can only go up to 50% duty cycle. That is where the usefulness of the SG3525 lies.If you need higher duty cycle, you could use 2 diodes, the anodes of which are connected to pins 11 and 14, and the cathode of both are shorted. Then you take the output from this point - the cathode of the diodes. Make sure you use ultrafast recovery diodes for higher frequencies. If you use this method, remember that you're blocking the pulling down / sinking ability of the internal totem pole of the SG3525.So, you should use an external (totem-pole based or driver chip based) driver to drive the MOSFET.

Hope this helps!Regards, Tahmid. Hi, I've mentioned this in the article above: Pin 15 is VCC – the supply voltage to the SG3525 that makes it run. VCC must lie within the range 8V to 35V.

SG3525 has an under-voltage lockout circuit that prevents operation when VCC is below 8V, thus preventing erroneous operation or malfunction. Pin 13 is VC – the supply voltage to the SG3525 driver stage.It is connected to the collectors of the NPN transistors in the output totem-pole stage. Hence the name VC. VC must lie within the range 4.5V to 35V. The output drive voltage will be one transistor voltage drop below VC. So when driving Power MOSFETs, VC should be within the range 9V to 18V (as most Power MOSFETs require minimum 8V to be fully on and have a maximum VGS breakdown voltage of 20V).

For driving logic level MOSFETs, lower VC may be used. Care must be taken to ensure that the maximum VGS breakdown voltage of the MOSFET is not crossed.Similarly when the SG3525 outputs are fed to another driver or IGBT, VC must be selected accordingly, keeping in mind the required voltage for the device being fed or driven. It is common practice to tie VC to VCC when VCC is below 20V.

I hope that answers your question! Regards, Tahmid. Check the power connections to the SG3525.Ensure that pin 16 (VREF) isn't shorted to ground or VCC. Ensure that none of the outputs are shorted to ground or VCC. Ensure that VCC is within acceptable limits.Remove the connections to the MOSFETs all together and then check the outputs of the SG3525. Measure both the frequency and the voltage. Check the shape using an oscilloscope, if possible.You might even have damaged MOSFETs that are damaging the SG3525.

So, if the outputs seem to be correct without the MOSFETs connected, replace the MOSFETs with new ones. Hope this helps! Regards, Tahmid. Anonymous Hi Tahmid, great blog and thanks for sharing this valuable information!!! Last night I tried this circuit and it seems to work fine, but the r10 for feedback was very hot.I have just one question: the net format of R10 and R11 is 57kohm, the current flowing is 290v/57kohm = 5.08mA more or less.

The power dissipated is P = R.I^2 = 57000.(5.08mA)^2 = 1.47W is not too high? In This configuration should I Use a 1W resistors? It's not better to increase the value of the net resistance and limit the current flow while maintaining the same ratio of divider? For example R10 = 120Kohm and R11 = 2.2kohm so the current flow is 290v/124.2kohm = 2,33mA and the power dissipation is (2.33mA)^2.124200 = 0.67 W So can use the half-watt resistors. Greetings from Italy Pier.Yes, 1.47W is a little high.

But you can use 3W resistors safely. 1W resistors won't do. You need to select a resistor with a power dissipation capacity higher than the actual max dissipation. Twice the actual dissipation is a good figure. And that's why I mentioned 3W. Yes, you can use larger resistance to lower the current and thus the power dissipation.If you get a 0.67W power dissipation (calculated), then you should use a resistor with a power dissipation capacity of at least 1W. Remember that this is for R10.

R11 won't get hot. Hope this helps.Regards, Tahmid. Anonymous Hi Tahmid, great website! Saves me a lot time. So, I don't think you saw my last post about a uc2845 ic, looks like they call it a flyback converter (what I was building), simple design but since my e-core transformers made anoying noise (can't really explain it, nothing to do with lose windings with toroids there was no problem) even at 48khz specialy with litle or no load, under 'heavy' load it was better, and after removing some secundary windings it was also better but the output voltage was dropping under higher load. So I started building the 3525 circuit My goal was still 24-+-200VDC I made everything like your schematic and it worked!Except I put in a lm7818 for feeding the 3525 and mosfets. Since the efficiency was crap with a first test (I used the 1N4007 for the bridge rectifier), maybe the output capacitor of 470uF 450V is to big, they were also getting hot.

I swaped the diodes for Buy27. So now I got 209V 0.63A output @ 75% efficiency and 208V 0.17A @ 74% efficiency. No load (only about 1W for the voltage sensing feedback resistors ) the circuit draws about 2.2W.I'm using 2 times 7 turns prim, and 70 turns sec. So my turn ratio is a bit on the high side, maybe I could remove 5 turns. The fets 250v 38A 0.075mohm and are not warm, mounted on a big heatsink I must say. @ 0.2A output the transformer is not getting warm, at 0.6A the windings are warming up, but the core stays cool.

(with 48khz I could even be save with only 3 prim turns) I'm using 0.28mm² wire for the transformer. I think I need to parallel more wires for my primary coil since it is recomended to use 3A/mm² right?0.28mm² is to low I guess since my prim pulls 6-7A. I'm not using the output riple/snubber? Coil so I will experiment later with that. NOw, I want to higher my efficiency, since I'm losing almost 45W with an output of 130W, there must be something in the chain that is losing a lot of power!Now I cant notice parts that are heating up more than they should, any tips? My multimeter is decent and made no calculation mistakes.

Btw is it possible to make a current protection with the 3525 or do I need a more complicated driver? Use a driver circuit between the SG3525 outputs and the MOSFET gates.Bring the primary turns down from 2 x 7 turns to 2 x 4 turns or 2 x 5 turns. Adjust the secondary accordingly. 0.28mm^2 is what, SWG 24, right? With a primary current of 6-7A, use 3 x SWG 26 wires in parallel. That should help - improved current handling + reduced losses from skin effecy. Use ultrafast diodes at the output.

What are the specifications for BUY27?I regularly use UF4007 diodes. DO NOT use regular rectifier diodes like 1N4007 as they are too slow. Just take a look at the reverse recovery time in the datasheet! Reduce the output capacitance to about 100uF. Try with these changes and let me know the result. Regards, Tahmid.72 x 26 SWG is not required! If you can use that many, 72 or even 65, there's no harm.

It's even better due to lower winding resistance. But about 15-20 x 26 SWG should be more than enough. Of course, the actual capacity will depend on the specific wire itself, due to its properties such as insulating material, etc.

So, oversizing may actually be a good idea if you have space. For frequencies less than about 100kHz, I don't think you really need to worry about skin effect for SWG #26 wire.Regards, Tahmid. The given connection (with pin 1 connected to output via the resistors) provides feedback. Please go through the article thoroughly and you can understand the feedback implementation. You can avoid connecting pin 1 as shown if you choose not to use feedback.

The thickness of the primary and secondary wires are selected depending on the current through them. Use multiple thin wires in parallel - don't use wires that are too thick. Google 'wire skin effect' and read about it to know more about this.Regards, Tahmid. Take a look on this page: The links given on the above mentioned page are: Regards, Tahmid.

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SG3525 should not be used for generating SPWM signals. You can use the analog method as you described.

But better would be to use a microcontroller to generate the SPWM signals. Take a look at these: Hope this helps!Regards, Tahmid. I can't give you any complete circuit, but go through these: Hope this helps! Regards, Tahmid.

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Anonymous hello Tahmid keep the good work going. Ihave a problem with a modified sine wave inverter i built. Its running at 60hz on the output when ever i plug appliances in it like tv radio fridge lights etc the frequency at the output remains at 60hz but when i plug a fan into it I see my meter showing frequency change like 158hz and it is not stable if I use one leg of my meter and touch one leg of the ac out it reads 60hz but accross two legs I see an increase but this only happens with a fan pluged in.

Please help me here.I can't give you any complete circuit, but go through these: Hope this helps! Regards, Tahmid. 1) Use MOSFETs with very low RDS(on) to reduce on-state resistance, thus reducing power loss and increasing efficiency. If necessary, connect MOSFETs in parallel to reduce RDS(on). This reduces conduction power losses. 2) Negative voltage is not required.But use a good driver circuit to turn the MOSFET off as quickly as possible and to ensure that the MOSFET is turned fully on when it is on. 3) Don't use too high a frequency that the switching losses are increased.

4) Use good transformers with low leakage inductance. Hope this helps.

Regards, Tahmid. Thanku Tahmid. But this concept is work practically.This is just a academic project. We are the manufacturing Company. In large volumes this design is not correct choice. Can you please tell me that how much efficient this design. Is there any practicale issues with design.I saw some where else Bubba Oscillator is not efficient.

And this having max current capacity of 200mA only. But for my application Input = 12VDC output = 230VAC, 50Hz, It is going to rural areas so in India rural areas having Inductive Loads only. It should Work with inductive loads. And more over the above design (SG3525) is useful for Inductive designs. With High frequency DC Voltages.In you have mentioned that only number of turns. But we cant able to construct Ferrite Transformer without knowing inductance. So, can you please tell me the inductance.

So finally i need 2 clarifications High Frequency DC is suitable for Inductive loads or not & Formula for inductance.Thanks in advance. Regards, Anvaya Designs. You can build pretty high power systems with it.

But I think I've read that Bubba oscillators are unstable and take quite an effort to get stable.For commercial applications with high efficiency, I think your best choice is to use microcontrollers. Go to this page: Scroll down to 'SPWM and sine wave generation and inverter:' and see all the related articles.

I've got loads of articles/tutorials on sine wave generation and implementation using the Microchip PIC, Atmel AVR and the Microchip dsPIC. SG3525 is used for just regular PWM - for obtaining square wave / quasi sine wave outputs.

For forward-type converters, such as forward, push-pull, bridge, what's important is the number of turns and the relevant flux density. Don't worry about the inductacne. I don't get this last part: 'So finally i need 2 clarifications High Frequency DC is suitable for Inductive loads or not & Formula for inductance.' Could you clarify? Hope this helps.

Anonymous Hello Tahmid I have benn following ur info all over the net and I must say I appreciate your support. I have a question here.I am building a pushpull transformer output inverter. The circuit uses 1k as gate resistors and 10k from gate to source.

I want to use about 24 irf260 fets.I want to know if lowering the gate resistor from 1k down to about half ( 500ohm) if this would give me more power from the fets. I am using one of your totem driver circuits to drive the fets.Thank u for ur support. Hy Tahmid,i hope you will be fine.I am having a problem in making inverter.i'm making inverter using tl494 and sg3524.i'm using push pull topology to drive transformer and tl494 to drive push pull mosfet and sg3524 to drive full bridge mosfet.but there is no feedback.its just a simple circuit.can you send me the tl494 and sg3524 circuit with proper feedback.i have shared the only tl494 circuit file.link is my email is dowson.jack17@yahoo.com. That Was a very Great Circuit, I made it, It was Awesome.But I have a lil problem. We reduced the Frequency of output to 350Hz, to use a transformer of iron core,E I 6630 the problem is that the output is not stable after a while of usage. Anther problem is that when we change the value of the load, the voltage is dropped from 36 to 20V DC at 600mA output is 36VDC, if 1.2A, out 30V, and if 1.8A - 20VDC. We changed the CT value (Pin5 and ground ) from 1u, to 530nF.

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And we use MOSFET SSF7509 as How to solve the problem.

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