1000 Threads found on edaboard.com: Transistor Protection Circuit
What sought of protection u want to go for, current limit, over voltage for PDD,
For current limit u can simply build ur circuit around two PNP transistor.
For overvoltage detection also u can go for simple opamp with a zener voltage reference .
But decide wat protection u want to go for
Analog Circuit Design :: 03-26-2007 08:58 :: saurav_sdpl :: Replies: 3 :: Views: 1422
If in an regulator if the load ouput point has accidently been shorted to ground then a large amout of current will flow through the circuit and this can damage the pass transistor. Hence a short circuit protection can be used to detect this. Over current in a regulator can arise if the output load falls to a (...)
Analog Circuit Design :: 08-14-2007 08:36 :: Chethan :: Replies: 2 :: Views: 2339
I have a question about LDO over current protection. the question is following:
When the current of output transistor is to high, the protection transistor (PMOS) will pull up the gate of the power transistor to high voltage and close the power transistor. but the current flows (...)
Analog Circuit Design :: 02-03-2008 02:51 :: yxk :: Replies: 1 :: Views: 2406
What?s the idea behind the actual circuit? Load disconnect if input voltage lower than some fixed level? In this case I think you need to wire zener diode in series with the input of transistor?
Analog Circuit Design :: 07-24-2011 17:18 :: mister_rf :: Replies: 2 :: Views: 871
Hi,I am laying out an OPAMP in cadence IC 615using AMI 16 tech and would like to implement a thermal protection circuit that will shut off the power to the transistor if the temperature rises above a preset value. Could anyone point me in the right direction?
Analog IC Design and Layout :: 05-13-2014 02:04 :: legendkiller :: Replies: 3 :: Views: 322
In case of using X9572XL to receive digital (TTL and CMOS) input directly from connector. Any recommendation for input protection circuit that will prevent CPLD pin to destroy from uncertain condition.
PLD, SPLD, GAL, CPLD, FPGA Design :: 08-27-2003 20:45 :: elektrom :: Replies: 3 :: Views: 2236
Could you provide me a schematic or needed devices for a Li-Ion accumulator protection circuit?
Thank you in advance,
Hobby Circuits and Small Projects Problems :: 02-10-2004 01:33 :: cube007 :: Replies: 2 :: Views: 1200
Please give me a advice or other solution for below circuits.
It's a over temperature protection circuits.
Analog IC Design and Layout :: 04-26-2005 06:44 :: Y.C Park :: Replies: 11 :: Views: 3330
now i am designing (obverse design) a VFM step-up dc-dc converter with 3.3V output and must protect the power switch. can you provide me a LX switch protection circuit or VLX limiter? thanks in advance.
Analog Circuit Design :: 06-03-2005 04:50 :: wonbef :: Replies: 1 :: Views: 584
Can anyone give me any comment about the short-circuit detection and protection circuit used in PowerMOS?
My operated current is 50mA for normal and 250mA for short-circuit .
Thanks a lot.
Analog Circuit Design :: 01-09-2006 01:16 :: bamboo :: Replies: 2 :: Views: 871
besides adding those ESD protection circuits. For those transistors which directly connected to IO pad, you better use drain extended transistors.
Analog IC Design and Layout :: 09-17-2006 05:37 :: vivimz :: Replies: 22 :: Views: 1897
Can anyone here recommend any paper or book on ESD protection circuit?
Analog Circuit Design :: 09-07-2006 01:06 :: windmillkity :: Replies: 8 :: Views: 1151
Give me detail circuit diagram and theroy about "UNDER AND OVER protection circuit FOR AC & DC VOLTAGES".
Hobby Circuits and Small Projects Problems :: 01-27-2007 02:47 :: sangmeshwar :: Replies: 0 :: Views: 1075
I want to put a speaker protection circuit at the output of audio amplifier (LM386).
I am using 8ohm, 0.5W speaker. The voltage swing at theinput is 12V. I plan to increase the gain of audio amp until 200.
Please suggest simple circuits.
Analog Circuit Design :: 02-03-2007 22:49 :: imman :: Replies: 1 :: Views: 1125
I need to design ESD pretection for my circuit, but I don't have any idea about that.
Could anyone give me some hints on ESD protection circuit design?:|
Analog IC Design and Layout :: 02-13-2007 05:03 :: katrin :: Replies: 7 :: Views: 1189
Are there test bench available (for example, with Human boday model, 2KV)with which the ESD protection circuit can be simulated?
Analog IC Design and Layout :: 04-16-2007 12:31 :: katrin :: Replies: 8 :: Views: 2205
I currently have to design a analogue input circuit that measures 0-10v for an industrial envronment. The 0-10V will be buffered (op-amp) and then low pass filtered (RC) then used as a input to a ADC.
What circuits do people use to protect their inputs from over voltage, voltage spikes, shorts ...etc?
I mean apart from current limiting resi
Electronic Elementary Questions :: 07-11-2007 14:17 :: lynch :: Replies: 6 :: Views: 2375
Hi guys, Im new to this forum...need some help on my project. I need to build a protection circuit for my PSU so it wont fried the circuitry...fuse on wall plug is not an option. Anyone can help? Thanks!
Hobby Circuits and Small Projects Problems :: 10-23-2007 09:23 :: nigelang :: Replies: 4 :: Views: 1350
in recent days, I looking for the papers about the over current protection circuit of the LDO, but I only find one paper in IEEE and the circuit can't work over all corners, can some one recommend some papers to me. and give some opinions about over current protection circuits.
thaks a lot!
Analog Circuit Design :: 11-30-2007 10:13 :: yxk :: Replies: 0 :: Views: 577
Could someone give me some advices for how to design a overcurrent(or short circuit) protection circuit for power amplifier IC's output stage. I use the pseudo source follower output stage.
Reference: "A High-Performance CMOS Power Amplifier" John A. Fisher
"Class-AB High-swing CMOS Power Amplifier" F.Mistlberger and (...)
Analog IC Design and Layout :: 05-16-2008 03:30 :: tiger_ads :: Replies: 2 :: Views: 1068
how to design the undervoltage protection circuit for SMPS?
Analog Circuit Design :: 02-05-2009 08:54 :: wei9321 :: Replies: 1 :: Views: 1218
yes, I can afford 1k Ohm resistor, then how to protect the Op Amp?
As this is a MOS Op Amp, the parasitic reverse diodes of the output transistors of your Op Amp should stand the ≈15mA ((16V - Vf(diode)) / 1kOhm) - depending on the w/l ratio of the output transistors of your Op Amp. (If you can afford a series res
Analog IC Design and Layout :: 07-04-2009 11:20 :: erikl :: Replies: 6 :: Views: 3320
I need to know how to design a Surge protection circuit. Can anybody help on this?
Professional Hardware and Electronics Design :: 07-14-2009 23:35 :: Akhthar Ali Khan :: Replies: 1 :: Views: 1539
This is a simple overload protection circuit in a power supply. Usually that configuration(the differential opamp and diode) is use to control the power supply whether function in current mode or voltage mode(refer to 2nd attachment). However, i modified it become an overload protection circuit(the part that i drawn in the (...)
Analog Circuit Design :: 08-16-2010 12:38 :: chuackl :: Replies: 0 :: Views: 1034
Hey i want to simulate undervoltage protection circuit in orcad. How can i design the circuit so that load voltage decreases to say half its original value after 5m seconds?
Analog Circuit Design :: 12-02-2010 05:18 :: pona :: Replies: 2 :: Views: 653
Hi, I'm looking for building a custom protection circuit for rechargeable lithium ion polymer batteries.
The three protection offered by the standard PCM are :
- overcharge voltage
- over discharge current
- cut-off voltage
Assuming, the charge voltage is regulated and controlled by the charger IC, the over discharge current is (...)
Hobby Circuits and Small Projects Problems :: 12-03-2010 02:37 :: Argail :: Replies: 0 :: Views: 1224
I am measuring current across a resistor by connecting an electrometer across it.i want to make a overvoltage protection circuit for the electrometer that as the voltage across the resistor increases say 5 volts protection circuit supress the overvoltage and not direct the overvoltage to the electrometer.
Kindly give (...)
Power Electronics :: 08-18-2011 11:39 :: zeeshan728 :: Replies: 8 :: Views: 762
For the battery protection circuit, i found this schematic diagram.
How do i construct this circuit...and what is Eb+ and Eb-???
appreciate the help
Electronic Elementary Questions :: 08-30-2011 01:08 :: HappyPenguin :: Replies: 1 :: Views: 1183
We are facing problem to make our board get passed in the EFT testing. The same circuit is used in many PCBs which passed the test standard.
But, in the present board, we couldn't. For the protection we used only one bipolar TVS diode and there is no ferrite bead or resistor in that path.
Please help me by providing few design tips, equati
Electromagnetic Design and Simulation :: 10-31-2011 02:24 :: myatham :: Replies: 0 :: Views: 859
Can any one help me what architecture of CMOS over current protection circuit suits for NMOS driver.
Analog Circuit Design :: 03-30-2012 02:00 :: coolstuff07 :: Replies: 1 :: Views: 396
I am designing a circuit, in which the signal level rises to the maximum of 24V, but there is a potential that somebody can wire 230VAC to the input supply instead of 24V. I need to design a protection circuit that uses SMD parts to create the protection from 230VAC.
The circuit I designed (...)
Analog Circuit Design :: 08-01-2012 05:58 :: pjohn :: Replies: 2 :: Views: 566
I am making a audio current limit protection circuit.and I got a block which share me some ideas.
you can find the block.
they recommend to use LT6100 for current sensor,I use LTspice to simulate the result and find it is useful to DC but not good for audio signal.
the output is also a sine wave and the amplitude i
Analog Circuit Design :: 09-07-2012 12:41 :: zhengchao201105 :: Replies: 6 :: Views: 413
Hello.can anyone tell me which diode is the best choice for reverse polarity protection(12v DC)?Can you mention its voltage¤t spec?
Electronic Elementary Questions :: 01-17-2013 00:38 :: ashwini jayaraman :: Replies: 2 :: Views: 987
please suggest some reference designs of protection circuit that receives digital input??
Digital communication :: 09-14-2013 07:39 :: Dimpi :: Replies: 1 :: Views: 251
please help me designing a protection circuit in which surge protection as wel as mosfet based reverse polarity protection is included...the maximum current that the device can handle is 2 ampere and the voltage that it can handle is accorsingly please specify the fuse specifications and zener diode specifications..how to (...)
Digital communication :: 09-15-2013 10:43 :: Dimpi :: Replies: 4 :: Views: 566
could you give me some advise about how to design a effective protection circuit as mentioned and the cicuit should consist of the simple componets only, cause the boss do not wanna spend too much money on it!! :cry: .i have tried some devices like zener diode or power TVS,but they can not solved my problem completely,and the 120v
Electronic Elementary Questions :: 12-26-2013 02:04 :: kobeismygod :: Replies: 4 :: Views: 328
I have given a 10 v ac for adc circuit by using voltage divider circuit.after that i have to give this voltage as a input to adc.inbetween that i have to include protection circuit which is used to protect my adc from over voltage.for that i have used schottkey question is the input of the diode is ac the diodes required a (...)
Electronic Elementary Questions :: 01-23-2014 01:15 :: PRIYADHARSHINI PALANISAMY :: Replies: 4 :: Views: 354
I am making an over charging protection circuit for a 12V, 30Amps battery. I am confused that when charger will be removed, will the battery voltage remain at same potential as the potential with charger? E.g when charger is connected voltage measured is 14.2V, when the charger will be removed, battery voltage will be 14.2 or less than 14.2?
RF, Microwave, Antennas and Optics :: 04-19-2014 10:12 :: adnansarwar2050 :: Replies: 1 :: Views: 246
You would be better off, I suspect, using a MOSFET as a switch as the voltage drop across a transistor would drop the voltage below GPS voltage requirement. I am sure you can find many MOSFET switch circuits on the internet.
Analog Circuit Design :: 04-19-2014 19:39 :: kam1787 :: Replies: 1 :: Views: 330
I have a spec given as, there is a output voltage of 12V from an external connector. This 12V should be used to power our circuit board (Our circuit needs 12V). But before connecting we should have input protection circuit in our circuit board because from the external connector there could (...)
Hobby Circuits and Small Projects Problems :: 11-24-2014 01:00 :: ghasant :: Replies: 1 :: Views: 348
It?s a fairly simple scheme the current limiter. Think of the current-limiting circuit as a resistor that can change its resistance. It will automatically detect the amount of current that should be flowing through and change its resistance accordingly. The incoming current first goes through a current sensor (R1) whose output signal goes to a PNP
Electronic Elementary Questions :: 09-29-2011 04:44 :: mister_rf :: Replies: 5 :: Views: 487
You show a DC input of 16V but also a 10V capacitor over the same point?
What are the voltage and current range you want this to work? The circuit will have very bad regulation as there is no proper feedback to compensate. At the moment, the output is only dependent upon the gain of the two transistors. That will change with temperature.
Professional Hardware and Electronics Design :: 09-01-2013 02:16 :: E-design :: Replies: 7 :: Views: 2037
which tools can i use easy to draw transistor level circuit schematic and can output spice netlist for hspice simulation in linux enviroment? i hope the tools can be easy get, free or cr*ck already.thanks
A. Oregano (Free for d/l)
1. Xcircuit (Free for d/l)
Linux Software :: 12-12-2002 00:42 :: jimjim2k :: Replies: 2 :: Views: 3634
I need of a simple circuit for protect integrated circuits 74HC245 ( that i use like buffer to interface PC with test circuits ) from unforeseen event strong absorptions of current.
Thank you in advance
Hobby Circuits and Small Projects Problems :: 03-02-2003 10:43 :: FOX :: Replies: 1 :: Views: 2537
The block may be used for thermal and star-up circuit for bandgap.
It protects the power transistor(pass transistor).
The circuit may be a LDO.
There are bandgap, protection circuit and star-up ciruit blocks.
Analog IC Design and Layout :: 04-14-2005 11:20 :: jiangwp :: Replies: 6 :: Views: 785
attached is a figure of normal esd circuit.
we have three diodes:
Zenner diode and diode to PWR will protect circuit when power pin is floating.
However, what about when esd happens, the ground pin is also floating, what is the discharge path? to substrate?
Analog Circuit Design :: 01-26-2006 19:48 :: neoflash :: Replies: 5 :: Views: 1478
The need for extra protection really depends on the process. Some of the processes I work with have very fragle NMOS transistors (drain silicide shorts to body) others are more robust. If the output transistor is large enough and is designed with the same rules as the ESD device then it could be OK. You really need to discuss this with the (...)
Analog IC Design and Layout :: 03-15-2006 06:29 :: DoctorProf :: Replies: 8 :: Views: 1126
Have a look at these posts * by t
Analog Circuit Design :: 03-30-2006 11:07 :: papyaki :: Replies: 1 :: Views: 788
What should I use to protect my electronic module (LDO 3.3V regulator, uC, RF transceiver) on automotive enviroment... This module will consume about 50 mA.
I found this on ST site... is it good enough or should I add something else, like inductor, PI filter, and so on...
Analog Circuit Design :: 12-11-2006 09:14 :: Rafael :: Replies: 2 :: Views: 1227
Please, give me detail circuit diagram and theroy for UNDER & OVER protection for electrical devices.
Hobby Circuits and Small Projects Problems :: 01-25-2007 04:27 :: sangmeshwar :: Replies: 2 :: Views: 2430