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Hi Mate,
With the SG3525 the feedback would have to be through a voltage divider. Look at the datasheet and look at it again. Also the SPWM is is an averaging of a square waveform to replicate a digitised sine wave. Thats all it is. IT can be generated by comparing a sawtooth waveform of a...
What is "Fsw" in relation to switch mode power supplies?
Guys,
I am curious to know what FSW means in SMPS. I think its the operational frequency of the oscillator. I am not entirely sure though.
Let me know
Cheers
Karthick
Hey,
You might want to connect Vcc to a higher voltage. Look at page one in the datasheet, it says Supply voltage must be atleast 1.5V more than the common-mode voltage. Also be careful when using comparators going close to the rails. Some only work between Vcc-1.2V and GND + 1.2V. Check it...
Hi dark night,
Look at it carefully, And you will see that when the uC outputs a HIGH, that causes the FET to conduct, which means node 3 is at GND potential. This causes the PNP BJT to conduct while at the same time the NPN BJT dosent conduct because the common emitter would be sitting at...
Hey I know you are looking for a free software but here is a good simulator for cheap. Its called circuitlogix and it only costs $39 (from memory) for a lifetime and its very useful. Its a much simpler interface than the multisim and its a one window application. So have a look at it. Its got a...
The 555 was one of the most widely used ICs back in the day before micros were popular. THey have several applications as well. Like security alarms, proximity sensor, the list is endless, I reckon you check out this website...
Hi mate,
For the FET the most important things that you need to look at are the absolute maximum characteristics, typically for the N-type MOSFET for boost converters look up IRF1405 or IRF3205, etc... See if they match up. With L and C you need to find an inductor that can handle the current...
You are right there LvW, I worked it out but found the gain to be Load_R/(Load_R+R1)! So for Big loads the filter isnt very effective? Is that a correct observation?
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You are right there LvW, I worked it out but found the gain to be Load_R/(Load_R+R1)! So for Big loads the...
Hey tpetar,
I was looking at the transformerless design and I was not able to figure out why the pass transistor is on the return path here? Whats the idea. I figured that the zener drops 39 volts across itself and another 0,7V lost across the 10k resistor and the rest (191,3 V) is lost across...
Re: how to determine the stability of the system
Hi Powersys,
I was wondering if margindemo.m is a system file or if you made it up? If you did could you put it up?
Cheers
karthick
Hey Mcplay,
Heres something else you can do after rectifying the mains and it works with a wide range of input voltages! I tested this and it works rather well with accuracy of upto 10-25mV. Although the driving stage is not very stable, still pretty good. Just another idea/
Hope it helps
K
Check out this thread
Here
It goes through a step by step approach to Switch mode power supplies. The cookbooks is a great starting point. Its very good.
Like Tahmid suggests get the Power supply cookbook by Marty Brown, Its good.
Hope it helps
Cheers
K
Re: 1/2 kW SMPS 2-50V 0-10A
Hi guys,
I have been going through the SG3526 and the UC3845 datasheets and didnt understand the function of the compensation pin? What does it compensate?
Regards
K
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