218 Threads found on edaboard.com: Mosfet Diagram
I have encountered a circuit whereby I could not understand how does it suppose to work.
There are 2 similar P-Channel mosfet (Vishay Si1413) which I shall termed it as Q12 & Q15.
Both mosfet have their gate connected to a single control point which means if a low is applied, both mosfet will be turned on.
Drain of Q12 : DC (...)
Analog Circuit Design :: 18.05.2004 10:32 :: ayeong :: Replies: 5 :: Views: 1997
Use a pmos +zener+op, you can make a basic LDO.need advanced imfomation,use google with "mosfet LDO".
Analog Circuit Design :: 29.05.2004 01:04 :: alphi :: Replies: 1 :: Views: 786
Hello I want some material to study about DAC can someone provide me material or site links to know basic circuit diagram of DAC using mosfet.I tried searching net but in vain.i would appreciate it
RF, Microwave, Antennas and Optics :: 28.09.2005 14:15 :: tbksandeep :: Replies: 2 :: Views: 1088
In the attached diagram, what is the maximum voltage the capacitor would charge to. The gate is tied to 5V the Drain is connected to 3V the capacitor is connected to the Source of the nmos with Vt=1V.
I was told the capacitor would charge to 4V but i dont understand how.
Could someone elaborate.
ASIC Design Methodologies and Tools (Digital) :: 06.03.2006 03:04 :: rogger123 :: Replies: 9 :: Views: 1089
i want to control a dc motor 48V 24A using a power mosfet can any one help me out with which mosfet to use, circuit diagram . im planning to generate PWM using ATMEGA16
Microcontrollers :: 24.03.2007 01:42 :: nipun :: Replies: 1 :: Views: 983
Hi, I`m layout beginner.
I am just about to layout foldedcascode amp., comparator, etc... for the first time in my life.
I ask you about Stick diagram.
Is that only digital? or can use analog?
If all mosfet`s size is 1u/1u, How do you use layout technique(Multifinger, common-centroid...)? and How do I mathin
Analog IC Design and Layout :: 10.04.2007 03:14 :: Brittoo :: Replies: 3 :: Views: 1484
To drive a relay, you need to add 2 things to your circuit:
1. Comparator, which will detect when the output signal (proportional to gas level) will reach the threshold, where you want to close the relay. Almost any comparator (e.g. LM393) as awell as opmap wired as somparator will work for you.
2. mosfet, whose gate is connected to the output o
Analog Circuit Design :: 26.04.2007 20:39 :: kender :: Replies: 4 :: Views: 1989
The picture is not very clear, and I cannot tell exactly how the mosfet is connected.
Can you please re-post with a larger picture?
As long as you maintain the same duty-cycle, changing the frequency will not change the motor voltage until the frequency is low enough for the current to go discontinuous. Perhaps you can attach some waveforms, t
Hobby Circuits and Small Projects Problems :: 14.05.2007 12:28 :: VVV :: Replies: 1 :: Views: 2352
You can't do it from the beginning without solid rock electronic acknowledges.
Before reading a schematic you need to know precise and without any doubt:
- what is a transistor and how it wotks (bipolar, cmos, JFET, mosfet etc)
- what is a resistor and how is completely dimensionded
- what is a capacitor and how it works in AC and DC
- basic d
Electronic Elementary Questions :: 10.06.2007 13:42 :: melc :: Replies: 4 :: Views: 7960
i am trying to convert 12V/4 Amp supply to 7V/4 amp.I will be using both supply after conversion i.e 12V and 7 Volt also.This supply is going to use supply for thermal printer.Can anybody provide mosfet based solution .
Analog Circuit Design :: 14.07.2007 01:39 :: vaibhav.k :: Replies: 2 :: Views: 490
the way you have biased the circuit is right only also the mosfet is stable even through temperature changes....
i think you have to be careful in the selection of resistors and caps to be used....
RF, Microwave, Antennas and Optics :: 25.07.2007 09:49 :: A.Anand Srinivasan :: Replies: 9 :: Views: 4297
Since the external mosfets are not connected, Vs pin (high side ground pin) should be connected to gnd and VB pin will have a voltage close to Vcc (12V). The Ho pin will depend on the HIN pin logic. I think you should be able to see the voltage on the scope ans it should be depended on HIN pin.
Analog Circuit Design :: 11.12.2007 05:42 :: WindRay :: Replies: 3 :: Views: 2093
is it mean U have a range of output voltage in your input or output
by the way U must to use full-bridge topology like andre_teprom says
for this purpose U're better to Use IR2110 or 2113 as mosfet driver just use it's datasheet schematic
note: never use this IC for PWM it just support low frequency like 50 or 60 hz
Professional Hardware and Electronics Design :: 05.10.2008 06:08 :: sabeti_1990 :: Replies: 9 :: Views: 10489
hi dear new friends,
i've just found a (nearly)famous circuit diagram:25w mosfet audio amplifier
but i don't know how it works,what is the role of every part in the circuit?
and how the resistors and capacitors have been calculated?
is there anybody who can help me??please i really need to know!
this is the circuit:
Analog Circuit Design :: 01.06.2008 13:33 :: beheshtaein :: Replies: 12 :: Views: 3223
I need a circuit diagram of a simple FET Switch (specially mosfet). I want to control a 220V 500Watt AC Lamp. The circuit i ned that simply ON/OFF the Lamp with push botten.
Hobby Circuits and Small Projects Problems :: 25.06.2008 02:38 :: kg300 :: Replies: 3 :: Views: 2206
I need a circuit diagram of a simple FET Switch (specially mosfet). Actually I want to control a 220V 500Watt AC Lamp. The circuit i need that simply ON/OFF the Lamp with push botton.
Professional Hardware and Electronics Design :: 25.06.2008 02:42 :: kg300 :: Replies: 1 :: Views: 1246
Hi there, it me again!!
I also make other work.
This time on pspice.
I trying to trigger several mosfet with a Vpulse (15V or 20V) and I can not. I am using irf640.
PCB Routing Schematic Layout software and Simulation :: 18.11.2008 11:25 :: rudisoares :: Replies: 1 :: Views: 1183
Any one can guid me on how to design a mosfet high voltage AC swtich - or AC mosfet soild state relay
Any ideas,application note,ref design are wellcom.
Professional Hardware and Electronics Design :: 18.11.2008 11:41 :: bobcat1 :: Replies: 4 :: Views: 12676
I am working on it also,
I am using mosfets from International Rectifier
and also mosfet driver IC from IR also
the inverter circuit i made still under test, but that's what i tried.
Robotics and Automatics Forum :: 22.03.2009 13:31 :: veiledcavalier :: Replies: 3 :: Views: 11860
any body have a good hand on High frequency drivers?? I have had a lot of burnt mosfets trying.
Power Electronics :: 10.02.2011 04:03 :: amjadali56 :: Replies: 4 :: Views: 2810
I have made a dc to dc converter with the pulse width modulator IC (SG3524) , the output of this IC goes to the N-channel mosfet driver IC ( IR2117) and then I have used the N-channel mosfet with the buck converter configuration. now my problem is that the output voltage of the buck converter is not stable . so, please help me ,
Professional Hardware and Electronics Design :: 10.11.2009 02:45 :: irfan42 :: Replies: 0 :: Views: 1521
im working on this.very hard to part require the generator can be manually set frequency modulation (Mf) and amplitude modulation (Ma). which mean the sine wave generator and triangular wave generator have to be variable frequency and amplitude.the mosfet transistor is not easy to implement in H-bridge.when u come to practical,it is
Analog Circuit Design :: 06.01.2010 11:53 :: rockyou :: Replies: 2 :: Views: 2287
I want a inverter circuit diagram with operation using mosfet that input 12v dc and output will sine wave 220v ac with 50hz frequency.
please send to me it as soon as possible.
Electronic Elementary Questions :: 15.01.2010 07:45 :: Md.Atiqur rahaman :: Replies: 3 :: Views: 3079
In order to have answer to your question - you need to look at the mosfet DS(data sheet)
Look for the gate capacitance parameter !
Now go back and look at the controller DS for current drive (most controller cant drive more then 2 mA) in some DS you can find cap drive parameter - VG
Now check whether the controller you are using is
Microcontrollers :: 03.04.2010 06:27 :: bobcat1 :: Replies: 2 :: Views: 2095
The relation between simultaneous voltage and current versus the time duration is given in the so called Safe Operating Area (SOA, FBSOA). It shows curves in a U/I graph where time duration is the parameter. Time duration spans from DC in steps to ms or us.
The maximum current ant voltage may simultaneously only be applied during very
Electronic Elementary Questions :: 03.05.2010 17:23 :: WimRFP :: Replies: 7 :: Views: 1826
This question combines several topics. mosfet gate circuits and gate driver chips.
I am using an FOD3180 to drive the gate of an IRF 3315 or 3415.
The mosfet acts as a pulldown switch to turn on the coil of a 12 vdc relay. The front end of the 3180 is driven by a dc supply and current limiting R to get 10-15 ma into the LED when I want the r
Analog Circuit Design :: 08.06.2010 16:34 :: stu brown :: Replies: 2 :: Views: 1804
i am doing some works in power electronics field, routine switching i am getting
by swtching scr and triac, there is limitation of switching of this unit, i can not go
beyond supply frequency, because scr turns off at 0 volt of ac cycle,
now problem is such that ,i want to switch ac supply at 15 amp 440 v at 10 khz to 1
Power Electronics :: 23.06.2010 04:50 :: venuselectronics :: Replies: 7 :: Views: 1699
This works in common emitter mode.
Without relay, you can use BJT or mosfet, with or without isolation supply, depending on circuit configuration.
Hope this helps.
Power Electronics :: 25.06.2010 07:12 :: Tahmid :: Replies: 7 :: Views: 4675
I need a power supply for the load of 10KW, which will feed it with the alternative currency, but by pulses of 2 KHz. The power in the load will be regulated by regulating the duty cycle of pulses. Control pulses can be generated by PC or programmable controller, as the power in the load should vary depending on the time/date. Can you propose a dia
Analog Circuit Design :: 01.07.2010 07:36 :: mlambru :: Replies: 0 :: Views: 453
Transformers and diodes have parasitic capacitances that can have undesirable consequences. The secondary capacitances, along with secondary leakage inductance, can form a high frequency resonant circuit that is excited when the diode turns off. The resonant circuit will ring and transfer the AC waveform back to the primary.
Clamp circuits (s
Power Electronics :: 08.07.2010 15:10 :: Tahmid :: Replies: 7 :: Views: 3523
I am new to this forum.
I have a design in which i have difficulty in understanding one part of it. I am attaching the partial circuit of it.
I am just giving small description about the circuit i attached.
This circuit basically a Flyback converter. In the attached diagram the Left hand side is Rectified and filt
Analog Circuit Design :: 12.08.2010 09:30 :: malli_1729 :: Replies: 3 :: Views: 661
Depending on whether the mosfet is NMOS or PMOS. NMOS is used for pull down network. PMOS is used for pull up network. So, gate is from 7407, Power to Drain and fan to Source, the other terminal from fan will be connected to Ground.
Gate = The control of inversion layer. This inversion layer means the electrons/ holes generated that allows the v
Electronic Elementary Questions :: 28.09.2010 00:04 :: john blue :: Replies: 5 :: Views: 756
Without a schematic the only thing i can say is that you are probably not driving the mosfet gates with a driver that can handle the charging current of the gate (or you are using a gate resistor that limits the current too much) and the mosfet is not turned off before you turn it on again.
Unless you mean that the 555 circuit is not oscillating,
Hobby Circuits and Small Projects Problems :: 07.12.2010 05:53 :: alexan_e :: Replies: 3 :: Views: 1509
It's used to make sure the mosfets remain absolutely off during charging as the internal diodes are used, so that there is no short circuit. In the inverter I posted, I've tried without this transistor and instantly the mosfets blew off. When I placed this transistor, everything is fine. The mosfet driver stage, ie, the diodes and (...)
Hobby Circuits and Small Projects Problems :: 16.12.2010 09:01 :: Tahmid :: Replies: 44 :: Views: 13328
In the PM, you had asked for a better circuit. Here is with SG3525 would be nicer, but this will do quite well. You could change the mosfet gate resistors to 22ohm.
Electronic Elementary Questions :: 02.01.2011 03:17 :: Tahmid :: Replies: 2 :: Views: 3170
This driver can drive 2 N-mosfets, one high side and one low side.
Your schematic is too small and i also don't understand what is the actual problem you have with the circuit.
Professional Hardware and Electronics Design :: 19.01.2011 13:26 :: alexan_e :: Replies: 5 :: Views: 1231
Having some trouble here. I have simulated a mosfet potential divider in HSPICE given some simplified mosfet parameters for pmos and nmos. The widths have been prechosen, as is Vdd and Vss.
Key parameters known:
Vdd = 5V
Vss = -5V
Kn = 50u Vt = 0.9
Kp = 18u Vt = -0.6
Current is unknown.
Vgs is unknown
As said: width and length ar
Analog Circuit Design :: 22.01.2011 21:46 :: transcendent :: Replies: 2 :: Views: 561
there's a system which is working on battery.where the output device is consuming most of the current in the entire system.but it operates quite less what i prefer is to shut down the entire output section when it is not used and put the controller in to sleep mode to save maximum power.i think a mosfet is the best solution becaus
Microcontrollers :: 01.03.2011 04:24 :: sunish :: Replies: 4 :: Views: 346
I have made a circuit based on the FT232R data sheet example "Figure 6.3 Bus Powered with Power Switching Configuration". Basicly it uses a IRLML6402 (P-Channel mosfet) tp power up the rest of the circuit once the FT232R has request > 100mA current.
The voltage drop over the IRLML6402 is 0.5V, I really require a voltage drop of 0.25V or less. T
Microcontrollers :: 03.03.2011 21:17 :: MOS6502 :: Replies: 10 :: Views: 1703
.you can get more than 1kva if you increase the size of your transformer an d number of mosfet use.
Hobby Circuits and Small Projects Problems :: 16.03.2011 08:03 :: kabiru :: Replies: 13 :: Views: 34993
I've been working on a zvs driver circuit, whereby a tl494 drives a irf540 mosfet directly at 100kc's.
If I run the whole circuit on a single supply is runs fine, however if I use seperate power supplies for the tl494 and the mosfet load, and run the tl494 a few volts more than the load, the the mosfet runs considerably cooler, so much so (...)
Hobby Circuits and Small Projects Problems :: 30.03.2011 01:58 :: dr pepper :: Replies: 22 :: Views: 8112
Let me show you exactly what the problem is in a simplified circuit with a high side Nmosfet
You mosfet has an RDSon of 0.005 ohm and should have almost 0 voltage drop across drain-source but you can clearly see that you have a voltage drop of 3v because this is the balance point for this mosfet that has an low
Microcontrollers :: 02.04.2011 16:27 :: alexan_e :: Replies: 16 :: Views: 2653
Well, I thought I was receiving pieces of information to help me with my circuit. But it turned out to be NOT
You have closed your thread so I can only post an answer this way
In your other post in allaboutcircuits you have also been suggested to use a gate voltage higher that the drain voltage, you didn't acc
Microcontrollers :: 03.04.2011 06:02 :: alexan_e :: Replies: 0 :: Views: 409
i am a bit confused on short circuit protection, i don't know how to do this, i have to use relay or mosfet, i don't know how this circuit will work and, which is the best,
Electronic Elementary Questions :: 11.06.2011 15:47 :: yassin.kraouch :: Replies: 8 :: Views: 1152
i want to OM multiple mosfets in fixed sequence at any given time. How can i do it?
I understand that i must use some digital circuit or data bus to trigger the gate of mosfet. Please please help me how i can do it and please provide circuit diagram for the same.
Electronic Elementary Questions :: 15.06.2011 01:50 :: shekhar87 :: Replies: 3 :: Views: 258
There is a simple way to show that it is the diode failing and not the mosfet, start & run the circuit run normally and then (within a few seconds) command the mosfet to 100% ON (no off time) pretty soon the fet will fail due to overcurrent (make sure there is a sensible fuse on the supply to the circuit) - after the failure - check the diode - it
Power Electronics :: 20.06.2011 20:53 :: Orson Cart :: Replies: 12 :: Views: 1809
as the title suggests I am planning on using a mosfet driver to control a dc fan/motor, have no idea what kind I need to do the job, there are many different types
fan/motor will run 24/7 365 days ..possibly for several years
fan/motor will run continuously and vary between 10%-100% power
Power Electronics :: 19.06.2011 07:56 :: tuk :: Replies: 9 :: Views: 1069
Post your circuit diagram..
How do you drive the High side mosfets?
You may need a high side driver
Robotics and Automatics Forum :: 30.06.2011 04:40 :: nandhu015 :: Replies: 19 :: Views: 1809
The schematic is posted in the first post, maybe you are having problems viewing the attachment.
Try the link
Pin #5 is connected to the output between the upper and lower mosfet
Professional Hardware and Electronics Design :: 19.07.2011 16:38 :: alexan_e :: Replies: 3 :: Views: 1183
Resistors of 0R0 at gate seems to be too slow.
What do you mean, the gate uses a 0 ohm resistor, how can this slow the mosfet?
Did you mean low?
Hobby Circuits and Small Projects Problems :: 24.07.2011 08:28 :: alexan_e :: Replies: 7 :: Views: 876