Fall time in inductor current in boost converter DCM

Thread Starter

anhnha

Joined Apr 19, 2012
880
For the boost converter below operating in DCM mode, is the time during which inductor is deenergized (Tfall of inductor current) affected by how much load current?

upload_2016-3-15_21-52-17.png
 

Thread Starter

anhnha

Joined Apr 19, 2012
880
Is this homework?
No, I am not at school anymore.
The fall time is related to the value of L, C, and Iload.
I don't see how that time depends on Iload. Could you explain?
Fall time will be proportional to slope of inductor current while de-energizing (Vo - Vi)/L.
So how come it depends on Iload?[/QUOTE]
 

ResFiber

Joined Mar 9, 2016
5
I think the equation (Vo-Vi)/L is an ideal equation. In reality, I think the output voltage is not a constant, it has a ripple. So during the fall time the output voltage (Vo) is actually changing a bit, and the amount it is changing depends on the load current.
 
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