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66 Threads found on Power Clamp Circuit
I am working on a RFID front-end. The very first component is the clamp circuit that limits the RF input to a modest range. However, this simple clamp circuit (see figure) wouldn't work. The reason is that if the input signal is a 50% modulated ASK signal, at high power level, the output of this (...)
Hi, all, i am designing io&esd circuit using HV process(18v), Can i use rc -invertor power clamp for a switch controlled PAD ? which device can i use in power rail to rail (or power cut) esd circuit , using hv process or normal process diode ? thanks
hi all! how to simulate ESD power clamp? how the stimulus look like? how long RC constant require?
hi all! the attachment is the power clamp use for ESD. The RC constant is 1 us. The inductor is assume 1n for package model. The power suppy is ramp up from 0 to 3.3v in 1 us. But suprising the circuit oscillate as show in the attachment. My question is how this circuit can become an oscillator? And if i (...)
power clamp is referred to power supply I/O, and it often includes ESD clamp devices.
h all for power clamp, it has its own gnd called gndesd. And the other analog block of the circuit use analog gnd called gnda. The question is where should connect the substract of nmos in power clamp. To gndesd or gnda?
Hello, I have a question about gate-coupled NMOS for ESD protection. Usually the GCNMOS is used as power clamp between VDD to VSS. P+ poly resistor and MOS capacitance are used to set the RC time constant to sense the ESD stress to help triggering the NMOS clamp, so, when you design this RC triggering circuit, how much (...)
Hi, I'm looking for a power clamp operating between GND and 5V for independent rail based ESD protection. (There are other supplys available, like 3.3V and 2.5V) The technlogy is 0.25um. An RC-Triggered NMOS clamp for 2.5V was successfully designed, but how to scale up to 5V ? Has anybody an Idea ? Best Regards, Alpha999
Here is an example of a sourcing current source, clamped at 5V. The output current is 20mA, fixed. To adjust it, you can change R1: Iout=Vref/R1, where Vref=2.5V The output is clamped by the precision clamp IC1B, D1. For the clamp to work, the current should be maintained below 20mA. For higher currents, you would (...)
It is not "back" or "front". It is flyback or forward topology,is basic switch-mode power supply!
It sounds like you may be getting non-destructive latch-up. The charge from the cable injects charge into your circuit causing an SCR type action. You could put some voltage suppression (MOV, Zener, etc) to clamp the voltage to your power supply level. There are several external protection circuits that are available on (...)
Hi, every one. I have a simple question about the power measurement of a circuit which is powered by battery. Can I just disconnect the positive wire from the battery to circuit, and use a current meter to read the current while the circuit is operation? And should I measure the DC current or AC current? (...)
Im working on a small project presently...which i could get it to some extent...but the problem is as soon as i switch on the powersupply i find some transients in the circuit ...can anyone suggest a way to avoid those transients...otherwise the circuit is working properly
Thnx for your explanation, it is stated in a foundry design manual an ESD power clamp is required if the capacitance is less than 100nF betweed Vdd and Gnd. Is it possible to avoid this clamp if I place a MOS cap between Vdd and Gnd, with capacitance more than 0.1pF?. Thanks in advance Rgds
Hi Can somebody provide me with some information about powerclamps in IC design? What is it doing,why is it needed, how to implement it Also any papers, related chapters of E-books ...
IGBTs are controlled in the exact same was as if it were a MOSFET. so search for "mosfet driver" also. you will find lots of companies offer mosfet driver solution all in one chip. powerex international rectifier onsemi depends on your power level and circuit topology after that before more detail can be given. Mr.Cool
Hi whitewiz Seems like you don't quite understand the ESD triggering using this approach. In order to be safer, I suggest you to replace the final transistor to an NMOS transistor with gate connected to Vb, which is then a typical RC gate coupled structure for you to be more familiar with the basics first. Otherwise, you may fail finally in rea
It's RC based ESD power supply clamp. When ESD event is occured, this ckt shorts VDD and GND rails.
optocoupler temperature coefficient..Soft-start controller is gentle on loads..Method offers fail-safe variable-reluctance sensors..circuit forms adjustable bipolar clamp..Analog switch expands I2C interface..circuit safely applies power to ICs..Simple circuit forms peak/clipping indicator... eng raafat tannir
actually removing a snubber typically improves performance, or at least efficiency as its no longer consuming any power, though you basically are asking murphy to cook your ic's and transistors
Hi, I facing a problem here on ibis model, there is couple of question about generating this ibis model. 1. How to extract the C_comp value through simulation? Although the cook book show that we can perform AC analysis using tanks circuit, and get the resonant frequency.. but I wonder how should I do the connectivity for the method. 2. How s
What is the diference between GGMOS and GCMOS? Why is GGMOS using as input PAD ESD protection and GCMOS using as clamp circuit between the power rail and vss? reguards! sissi
What is the diference between GGMOS and GCMOS? Why is GGMOS using as input PAD ESD protection and GCMOS using as a clamp circuit between the power rail and vss? reguards! sissi
i want to drive tcd2557(a ccd of toshiba) with dallas mcu ds89c40,could somebody give me some links or help? many thanks first Driving CCD, right ? Dallas MCU DS89C40 or DS89C420/450? it must be DS89C420/450, as far i know, its MCU, not have internal ADC, which should be introduce on designing CCD based project.
Hello experts, I am learning the flyback power convert circuits. But I am quite puzzled by the attached circuit. There are seven red circles in question. Could anybody explain what these components are meant for? The nominal input voltage is 24VDC and output is 36VDC. Thanks in advance. Best regards, bittware
Hi zhonghan According to this figure: -2kV (negative zap) is applied at pin 1 with pin 2 at ground. According to the figure (green reference line) there was a forward diode from pin 1 to pin 2 and some element for the reverse stress case (power clamp, local clamp or diode up + power clamp). So (...)
hi i want to drive a high power buzzer of 12v from 8051 using uln2003 and relay ckt, can any one suggest me how do i hav to connect the circuit. please help its urgent.
I'm redoing control of Microcannel Plate.Sorry for incomplete info, and yes it was error. I just finished fully redraw it. I'm reconstructing schematics from existing PCB. Here it is. It was part of big device which I dont know. There is HV power supply with 2 outputs - one is +400V...-2000V and second +100V...+2000V. The voltage of each HV ou
In a power IC the bandgap and any cascoding is unlikely to be significant in the end, area-wise. It's the power devices' area. The current for a reference and housekeeping analog should not need much device width. Stacked MOS diodes and a resistor make a good enough shunt regulator, a pass follower (high voltage capable) makes a series
It depends on how much current you allowed it to draw. When you reverse the power connections, all the input protection diodes conduct at once. They will clamp the voltage across the IC to a safe level as long as they can withstand the current themselves. They can usually only handle a few mA though. If the current was limited, you might be luck
hi all do you have experinece in using high voltage (e.g. 3.3V) device as ESD device for low voltage(e.g. 1.8V/1.2V) device domain protection? usually, from circuit design perspective, he/she will not connect 3.3V device to 1.8V/1.2V power supply. i saw the 1.8V power clamp ESD device failed in several projects. while (...)
vin pad is the power supply pad, right? why you prefer to use NMOS as this decoupling cap? usually this decoupling MOS cap has relatively large size, so that reactance is relatively small. what's more, you have dedicated ESD power clamps between power supply rail and ground, at ESD event, the power (...)
Do you have the chip at your fingers? Use a multimeter to know the answer. The datasheet's maximum ratings suggest diodes of both polarities, but you can't be sure. So why not simply shutting down the input signals before the power supply?
MOSFET aren't generally provided with a clamp diode at the gate. They may possibly have ESD protection. Which transistor type you are referring to? All power MOSFET have bulk (substrate) connected to source and a built-in drain-to-substrate diode, necessary by technology. It's not provided for a particular purpose, but must be considered in cir
how to calculate total power consumed by a circuit driven by an A.C source?
Ok, maybe I don;t get something, but how did you come up with 15 ohm resistor for continuity checking. When power is applied but before microcontroller does anything there is 9V/(5+15R)=0.45 A flowing through squib to GND. I'd aim at something like 1k+1k in series (gives 4.5 mA and ). This gives voltage divider allowing small current to flow throu
Thermal stream units can produce static charge (triboelectric?) if not well grounded. The test floor should have air ionizers and ESD mats & wrist straps over the place. But you also need to look at the test program and hardware. Many tests can put more power into an ESD clamp than it can take (clamps are sized for the ESD strike, peak (...)
Hello ! I consulted power Integrations about a power supply design using one of their TOPSwitch IC's. The details of my questions are here: Need to design for 380 VAC mains 240 W power supply | power Integrations
In order for you circuit to work there must be a return path for the signal, either through the ground or through the plus voltage supply. Is your circuit power (positive and negative) connected to the signal power source?
Hello, I have a PFET which is suffering the following power dissipation , but only at switch on....... power dissipation in TO220: .....this PFET has no heatsink, will it explode? is the circuit in which it is is a current clamp, which limits inrush current at start up. Current
The overshoot of clamped output voltage is mainly caused by the delayed action of the OP slewing out of saturation. That's an intrinsic disadvantage of this cicruit, when operated with fast input signals. The FET clamp circuit suffers from the same problem and most likely additionally from charge injection, particularly when using a (...)
temperature range (-45 to 85 C) That's the hard part. The main problem with the circuit you showed earlier is that it compares the voltage across the current sensing resistor with the Vbe of a transistor, and the Vbe changes with temperature. The trick is to use a precision voltage reference that doesn't vary with t
There are several devices sold for this purpose. One is a shunt zener type circut. Many companies sell these. Harris is one. They clamp the voltage levels. A cheap thing is to put diodes from the line to the positive and negative power rails. If your circuit can operate with a little series resistance in the signal lines, putting (...)
It only powers on for about a sec. then it turns off. If you attempt to turn it back on after it turns off, it will not turn on. Its like it has a self reseting circuit breaker or somethhing.
Hi ! Rescently When i was constructing the project of automated fishing , I encountered the powerful EMI from three Small toy motors (brush type , permanent magnet) , it was so powerfull that , the controller 89C51 was almost unable to work , even after connecting 0.1uf and 1000uf capacitors at all the supply lines. After using two different pow
IRF540 is fine to use at 10V. you do not need a transistor front end. first remove the 555 timer and see if you can at least turn the solenoid ON. what is the pull-in current of your solenoid? Size your current limiting resistor for this +20% and make sure resistor is rated for continuous power loss (even though you plan on pulsing the circuit)
Dear Members, I need help in designing transient voltage suppressors in PSPICE. I need circuit diagram for a transient voltage suppressor which can clamp voltages up to 5 Kilo Volts. I dont know about peak power rating and the reverse breakdown voltage. Please help me in this regard. I need this information very (...)
hi , I am afraid that you made sth wrong. The circuit can work properly only when the op is powered by two power supply----a postive one and a negative one.Since Vout should be a negative voltage.
See here: AND HERE Push-pull example. The bottom trace is the drain source voltage? Where did you get the transformer, that?s quite the spike for what looks like a 30 or 40V input (If I?m reading your scope shot right). Or is this a high cu
Do you need to simulate a full DC_DC convertor using only BJT (lots of BJT :D ) or just using a normal dedicated controller and some externals power BJT? Like here: