Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

mosfet losses during inrush current

Status
Not open for further replies.
S

Siddharth_saxena

Junior Member level 1
Junior Member level 1
Joined
Nov 11, 2021
Messages
16
Helped
0
Reputation
0
Reaction score
0
Trophy points
1
Activity points
107
how to calculate losses of mosfet during inrush current?
 

Sort by date Sort by votes
You can do this with a DSO oscilloscope.


$name

Learn how using a Tektronix MSO/DPO4000 or MDO3000 Series Oscilloscope provides fast, simple analysis with automated power measurements.
www.tek.com

$name

This primer focuses on switch-mode power supply design measurements using an oscilloscope and application-specific software.
www.tek.com


Regards, Dana.
 

Upvote 0 Downvote
To calculate the losses of a MOSFET during inrush current, you need to consider the following parameters:

  1. MOSFET parameters: The datasheet of the MOSFET provides information about the maximum voltage, current rating, on-resistance, and gate charge.
  2. Circuit parameters: The inrush current, the voltage level, and the duration of the current surge.
  3. Switching frequency: The frequency at which the MOSFET turns on and off.
The losses can be calculated as follows:

  1. Conduction losses: During inrush current, the MOSFET will be fully turned on, and the losses will be due to the on-resistance of the MOSFET. The conduction losses can be calculated using the formula:
    Pcon = I2R
    where Pcon is the conduction losses, I is the current flowing through the MOSFET, and R is the on-resistance of the MOSFET.
  2. Switching losses: During inrush current, the MOSFET will switch on and off rapidly, which leads to switching losses. The switching losses are proportional to the switching frequency, the gate charge of the MOSFET, and the voltage level. The switching losses can be calculated using the formula:
    Ps = Qg x V x f
    where Ps is the switching losses, Qg is the total gate charge of the MOSFET, V is the voltage level, and f is the switching frequency.
By adding conduction and switching losses, you can calculate the total power losses of the MOSFET during inrush current.

It is essential to ensure that the MOSFET's maximum power dissipation rating is not exceeded during the inrush current, as this can cause thermal runaway and damage the MOSFET.
 

Upvote 0 Downvote
Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top