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# Input Surge Current

18 Threads found on edaboard.com: Input Surge Current

## "Soft-Circuit" for Linear LDO

One solution is to add an NTC current limiter at the input.

Protection depends on environment, such as exposure to 2kV ESD with 1ns rise time. There are internal Schottky diodes to both rails so it may be redundant. Usually a 1~10M to ground on input in case of disconnected source.then a series current limiter 10k for surge spikes up to 10kV for 1mA drops negligible voltage for typical 20 nA (...)

## protection from surge current and surge voltage

You need to define your environment. If the car battery is inside a car then the automotive specs are quite stringent such as -24V to +48? and a high Joule load dump rating to simulate the large inductive load from the electric clutch in an ACU, which can be easily protected with an MOV disc. If the input voltage drops to 0V with low impedance

## using tria to switch ac 220 volt

what is the difference between Maximum Gate Trigger current and surge current Rating ? These are the damage levels for peak input and output current levels. how to know current gate that will hold? THat's called (LOAD) Holding current , IH which has a NTC coefficient and is

## How to calculate amount of fets for inverter output

One needs to know; input DC voltage range Output avg. AC voltage range Power Factor of load and peak current demand of load ( e.g. if nonlinear rectified AC to DC, peak current can be 3x~10x Avg. ) or motor surge can be 5~8x Average ) Thermal resistance of your mechanical heatsink design Rca=1 to 3 deg/w if forced air cooled

## H-BRIDGE Large input capacitors functions

I really want to know the importance of the high uf capacitors across the voltage supply of H bridge inverter. I have worked with and without them but am unable to find a difference in performance of the two situations. Please kindly put light on this question.

## Offline SMPS filter with diodes across filter inductors?

I suggest a different method to design a ruggedized off-mains switcher. First provide it with surge immunity as required by IEC61000-4-5, e.g. by Varistors or TVS diodes. I assume the circuit won't have problems with input filter ringing after it. The quoted "active inrush current protection" is intended to reduce periodic peak (...)

## Which Of the components fails most often in low power offline SMPS?

5 then 4 then 1 2 if there has been a surge on the ac input if a capacitor of the secondary has a drop in capacity, or a high in esr, then the smps stops functionning and sometimes this high esr destroys the main switching mosfet.

## Help selecting TVS for a simple inverse polarity circuit.

Hi, i need to protect a circuit input from inverser polarity feed without any meaningful voltage drop. I was thinking on the basic parallel TVS diode with a fuse and filter capacitor so i will get an extra surge protection and filtering. At a normal operation the circuit will powered by a 12V supply with a peak current of 14A, but a (...)

## Step up converter inrush current

Hi, I have used the LM2700 to boost a 5v supply to 12v (currently using a laboratory power supply). The behavior is fine but when the load needs a surge of current (1A), the input and output voltage drops significantly. Will like to ask if there's any workaround to give a short current boost when needed. (...)

## AC Surge Protection Need Help...

Hi We are working on a metering project in which we take 3 phase AC input.. we have used LVM2P-015R10431 protection device... the protection is working fine the circuits remains safe when surge comes in but it doesn't reset automatically until done manually by removing power...

## N Chan Mosfet as current source

I need a current source with up too 350V compliance. I have a bunch of IRF710 (400V, 2A). I only need about 10mA. My actual application is running an LED from rectified mains (20-240VAC) The input voltage will vary so just a resistor will not work. Anyone have a simple schem or is this not a great approach.

## Failing Surge EFT test at 1kV.

1) the surge is applyed between the input AC lines. 2) 4kV surge discharge can be applied between FC-line and the output of device as an isolation test. in this case may be 2 mistakes: a) the optocoupler is opens or closes during surge- so device have no power supply. b) you have bad grounding - so the (...)

## Resistor connection in a SMPS circuit

Dear I think the purpose of 100 ohms resistors at the input lines is for surge protection or high current protection purpose. The capacitor C1 maybe there for high inrush current or surge current because u expect very high DC voltage to be available after the bridge rectifier at the (...)

## What is the surge current?

The input filter capacitor draw the high initial current, at switch on time it is inrush current(surge current). to limit this current use a NTC thermistor. :D