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Questions tagged [leakage-current]

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Temperature-dependent leakage current in IGBTs

On one hand, the leakage current of power electronics modules such as IGBTs depends on the temperature. On the other hand, the temperature distribution on the IGBT chips is significantly non-uniform ...
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1answer
74 views

Analog switch on an instrumentation amplifier input

I'm working on a project for school that involves a configurable input stage (AC/DC coupling and variable input impedance) connected to an instrumentation amplifier. I am wondering whether I will ...
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2answers
110 views

Ultra low leakage capacitor for nano amp current source

I am looking for capacitor type which has very low leakage such as 0.5nA since I am working with a sensor which generates between 0.9nA to 0.55uA. Based on my research Film or foil Capacitor has the ...
4
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1answer
145 views

Protecting a coin cell from high current spikes - using a capacitor or not?

I've built some prototypes and try to gather some data from them. Skip below the two horizontal lines to read more about it. Original Question Brief summary I would like to know whether it is ...
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2answers
127 views

Protecting against over voltage but with minimum leakage current

I have a circuit where I sense an input which is a voltage divider with resistor. Since the voltage divider needs to have high impedance, the current flowing through is in the range of 10's of uA. I ...
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4answers
192 views

How to measure leakage current?

I have an AC powered device, and a customer asks for exact leakage current. Current that can trigger a leakage current circuit breaker, so it's obviously something flowing through Y capacitors to the ...
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1answer
46 views

Electric Tester light up on secondary side of Ground

I have assembled a PCB, which takes mains input 240VAC line and Neutral (my system enclosed in plastic case , so no ground/earth is provided) , and it use on board SMPS module(https://www.meanwell.com/...
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2answers
213 views

How to wire latching SPDT relay using proximity switches without relay hanging

I have a hydraulic-driven piston pump that I designed and built. I need a way for the pump to automaticlly go up and down. I wired it using a SPDT relay and a 3 wire PNP NC (normally closed) and ...
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1answer
348 views

MOSFET switch is leaking current when off

I have an N-Channel MOSFET that I'm using as a switch, and after wiring 20 identical circuits, I'm finding that 3 of them seem to leaking current when switched to off. The MOSFET I'm using is from ...
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2answers
68 views

how can I get leakage current in tlp?

I got tlp test data and found that the current at vertical line means leakage current. But I don't understand the method how does the tlp-test measure the leakage current. I tried to search the ...
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1answer
316 views

Earth leakage tripping with 3 phase motor [closed]

I'm working in elevator world, i'm now in a strange situation. The 3 Phase synchronous motor is connected by drive then main controller and a distribution board. The faulty earth leakage circuit ...
0
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1answer
48 views

Floating Nwell schematic and introduction in a MOS switch

My classmate told me using a mos (body connect drain)as a switch may have leakage current,because there is a parasitic diode in that MOS,so there will have a leakage current.so i have to connect the ...
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3answers
2k views

difference between reverse saturation and leakage current

I searched a lot but I didn't find any answer For a PN junction diode is the leakage current when the diode is reverse biased Equal to the reverse saturation current?? If they are not equal so ...
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3answers
132 views

Maximum resistor values for transistor inverter (NOT gate)

I have my circuit configured this way because I'll be hooking up my 8051 microcontroller GPIO pin to the point where three resistors (R2, R3, and R4) intersect, and the microcontroller only outputs my ...
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0answers
151 views

Earth leakage from isolated power supply

I have recently put together a DIY bench power supply using a DPS5015 from Rui Deng and an old laptop power supply. Everything seems to be working fine except for a small amount of current leaking to ...
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1answer
277 views

Does leakage reactance of transformer depend on quantum of load?

In a single phase transformer, considering copper losses and core losses, I want to find whether the leakage reactance is affected by change in load on the secondary? I was unable to find an answer ...
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1answer
180 views

Li-Ion charger IC leakage current confusion

I'm currently building a Li-Ion battery charging circuit which has a 5V/2A input. It should implement load-sharing in order to keep the output alive during charging. For charging, I found the ...
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2answers
263 views

At what load is the leakage current quantified for a power supply?

In this document it says "According to IEC 60601-1, the leakage current limits are provided in Table 1." If the leakage current is due to Y capacitor, the load R and the the parasitic capacitance of ...
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1answer
623 views

I/O input leakage current definition

I'm collected some input leakage information for I/O libraries. Most vendors and datasheets give a maximum value +/-1uA for the input leakage information (see below an example): This value is higher ...
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1answer
117 views

Locality of ghost/phantom voltages?

I know about the ghost voltage concept. As far I as understood for example in an SMPS there is "Y" EMI filter and that little capacitance creates a RC voltage divider and we see the ghost voltage high ...
1
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1answer
325 views

Input leakage on digital input

I'm trying to understand precisely input leakage when a GPIO is configured as an input. So I read some MCU datasheets, here is kinetis MK20 datasheets on p15/16 are given input leakage currents. I'...
3
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1answer
383 views

Voltage drop across each diode and current drawn from battery

I'm wondering if below configuration forward biases D1. D2 is clearly reverse biased. Would D1 drop 0.7 V and D2 drop 10-0.7 = 9.3 V? simulate this circuit – Schematic created using CircuitLab ...
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0answers
75 views

Leakage induction compensation through capacitor

I am designing a battery balancer using a forward converter. One of the limiting effects on the balancing current is the leakage inductance on the transformer and the surrounding circuit. I was told ...
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1answer
533 views

LED strip doesn't turn off completely by transistor

I've made a circuit with a touch switch module turning on/off a LED strip via a transistor, and the whole thing works, but in the "off" state the LED strip still shines a bit. Touch switch module I'm ...
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2answers
108 views

MOSFETs leaks current between two water sensors

Goal: I've got a set of EC and pH water sensors that need to sit in the same batch of water / capture values real-time for a Arduino project. However my sensors cancel each other out when both are ...
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1answer
556 views

BJT DC Leakage (ICES) dependency with Vce

I am interested in BJT transistor leakage dependency on Vce. Specifically: parameter ICES (Collector-Emitter Cutoff Leakage, that is, collector/emitter leakage with base shorted to emitter) is ...
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3answers
271 views

How can I Further Reduce Power Leak from BSS84 MOSFET?

I am working on a device which is running from a 3V coin cell. A system timer enables a MOSFET which starts the actual circuit (MCU etc.) for a very short time. The system timer (U1) only uses around ...
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1answer
48 views

Induction Motor - Reactances and Leakages

In the induction motor equivalent circuit (either Thevenin or otherwise), the rotor, and stator leakages and reactances are necessary for any useful calculations. How does one estimate leakages and ...
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2answers
3k views

What is the “CV” unit for leakage current in a capacitor datasheet?

I've looked at a few leakage current specifications for electrolytic capacitors, and they all seem to specify the value as something like this: I < 0.01 CV or 3 (μA) after 2 minutes, whichever ...
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2answers
370 views

Question regarding collector leakage current with open emitter

In a transistor, we know that current amplification factor \$ \alpha \$ (DC) for CB Configuration is given by: $$ \alpha = I_{C} / I_{E} $$ Where, \$I_{C}\$ = collector current; \$I_{E}\$ = ...
4
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1answer
193 views

Does a Guard Ring around a PLL loop filter make sense?

Should I guard a PLL loop filter against current leakage with a pour? If so, where can I connect the guard plane? As an illustration: I use an IC in need of an external PLL-loop-filter connected to ...
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2answers
932 views

Dynamic and Active Leakage in CMOS

I studied various techniques to reduce the leakage power consumption in CMOS design. Leakage currents can be static and active. I understand the meaning of static (standby) leakage, but I am ...
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1answer
190 views

Effect of increased leakage of PMOS in reversed inverter configuration

I have built the standard CMOS inverter in reversed configuration by putting NMOS on pull up side and PMOS on pull down side. This will work like a buffer but the the upper and lower bound of the ...
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3answers
2k views

The mysterious case of the random leakage current

Disclaimer: I already know the solution of this circuit debugging conundrum (and it is not trivial), and I'll post it after some time, so that other people could give their contribution to this ...
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4answers
684 views

PNP high side switch base current leak?

This is for a Raspberry Pi AVR ISP interface board. Most of the functionality is around level shifting the logic to the target board's voltage. This is achieved with a 74ABT125 chip. It's powered by ...
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1answer
334 views

Leakage current to heat sink

I am working to lower the leakage current in an isolated power supply. The power supply uses an isolation transformer to step down from 120V/240V to 6.5V. The voltage is then rectified and run ...
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2answers
445 views

Why is there a resistor in a cmos X-OR gate?

While reading up on logic gates i came across this image on Wikipedia: According to the article, the resistor on the supply voltage for the inverter is necessary to ensure that no current is leaked ...
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2answers
226 views

What is the purpose of this bias resistor?

I am unsure what the following statement on page 4 of this application note (Over Voltage Protection Circuit for Automotive Load Dump) means. Resistor R4 provides a small amount of bias to Q2 in ...
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2answers
266 views

How the transistor works in this 555 circuit?

555 Is not able to provide long timing due to its leakage current. The following circuit is very useful to build a long time timer such as 1 hour or more. The accuracy of the time is not important ...
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1answer
221 views

How to stop leakage of mains adaptor [closed]

For the past year or so I have been using a mains to 5VDC adaptor to charge various devices. Everything is working perfectly fine but this charger I think, has a noticable leak to the low voltage side ...
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3answers
277 views

Strange IC input leakage current

I am reading the datasheet of the HEF4894BT. First I saw the input clamping current is rated at 10mA and than I saw the input leakage current would be 10mA, too. I thought the input clamping current ...
5
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1answer
466 views

Switching regulator enable pin low, but output isn't fully off. Why?

I'm working on a battery-powered application using two Texas Instruments switching regulators and a Linear Technology pushbutton power controller: I have confirmed that when I push the button and ...
0
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4answers
5k views

MOSFET Drain-to-Source Leakage Current over voltage and temperature

I'd like to know what's the characteristic curve of Idss in N-Channel MOSFET transistors over different Vds values at high temperature. As I've checked datasheets (like Fairchild's 2N7000 or FDC637BNZ)...
0
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2answers
127 views

KCL equation considering the leakage current

simulate this circuit – Schematic created using CircuitLab In the schematics shown here I want to find out the potential at Va and Vb nodes with assuming a constant leakage current Ileak ...
0
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1answer
51 views

Using super-cutoff to reduce Direct Source to Drain Tunnelling

I was wondering if anyone had any insight on how useful it would be to reduce direct source to drain tunnelling by applying negative gate bias voltages on sub-10nm FinFETs. Has anyone looked at this ...
0
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1answer
115 views

Measuring Leakage Current in a Splice

I am using a Polyolefin Adhesive-Lined heat-shrink tubing to water-proof wire joints. The method works well but I need to measure if the seal is truly water-proof. The datasheet provides a test ...
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1answer
200 views

Does an op amp needs an Input Bias Current to operate? [duplicate]

I'm confused about the source of Input Bias Current, is it generated by op amp, where the current "leak" from the op amp. or it's a must to operate the op amp? for example if I have in a data sheet a ...
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0answers
301 views

thyrsitor leakage

I have built a circuit to switch a thyristor* on and off . The circuit is like the circuit below. when the gate is on all is right and the device is latched when the gate voltage is removed , but ...
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1answer
421 views

Power down current

I'm designing a Variable Gain Amplifier (VGA) for a course project. I'm using Cadence CMOS 180nm technology. One of the requirements is to find the power down current through simulation. I searched on ...
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3answers
547 views

What is a good voltage regulator or voltage regulating circuit for my micro-USB battery charging needs? [closed]

I have a need for a voltage regulator such that I can use it to down-convert 5V USB to about 3.3V in order to charge a lithium battery. Ideally: Assuming some users may have a faulty micro USB input ...