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

[SOLVED] Maximum Transient Current Calculation

Status
Not open for further replies.
mishrashashi

mishrashashi

Advanced Member level 4
Joined
Jan 5, 2011
Messages
105
Helped
20
Reputation
40
Reaction score
20
Trophy points
1,298
Location
India
Activity points
1,912
Hi,
I'm simulating my PCB for power integrity (IR Drop). I got a term "Target Impedance" (Ztarget)

Ztarget=[Voltage * (% ripple / 100) /Max Transient Current]

As per my consideration,
Voltage= voltage on a trace.
% Ripple is tolarance in voltage. (for example, 5V, 5% Ripple)

But I dont know, how to calculate Max Transient Current for a trace available on PCB. Please Help.
 

you could use the worst case peak current per rail : Ipeak = Pmax / VDD

you can estimate the transient current (rule of thumb : Itransient ~ 0.5 * Imax)
 
Thanks Loosemoose,
I got the similar answer from other resources.
Maximum Transient Current:
A short-lived oscillation/decay in a system caused by a sudden change of voltage or current expressed as a function of time exponentially. The universal time constant formula is given by-
Change= (Final-start)(1-e-t/τ)
ITransient = Imax (1- e-t/τ)
Where,
τ= L/R
e= eular’s number ≈ 2.7182818
e.g. t=1 sec , τ= 1
Itransient = Imax(1- e-1)= Imax* 0.6321 ≈ 0.5*Imax
 
Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top