SneaKSz
Member
Hi all,
Well in SMPS we have the coil the is being charged when a voltage stands across it ( eg boost). Thereby the current ramps di/dt.
If I use an inductor with a resistance in series with it, τ=L/R and the inductor will charge so Vl = 0V and all the voltage stands across R. The current flows exponential.
My question is now with SMPS, the mosfets ( in series with the inductor) RDSon is low (<1ohm), why doesn't the current flow exponential but it ramps up when the mosfet conducts?
Sometimes there's a current sense resistor in series with the inductor, and still the current ramps up, I'm a little confused.
Hopefully someone can help me out!
Edit : posted the question in the wrong section of this forum, my bad.
Kind regards
Well in SMPS we have the coil the is being charged when a voltage stands across it ( eg boost). Thereby the current ramps di/dt.
If I use an inductor with a resistance in series with it, τ=L/R and the inductor will charge so Vl = 0V and all the voltage stands across R. The current flows exponential.
My question is now with SMPS, the mosfets ( in series with the inductor) RDSon is low (<1ohm), why doesn't the current flow exponential but it ramps up when the mosfet conducts?
Sometimes there's a current sense resistor in series with the inductor, and still the current ramps up, I'm a little confused.
Hopefully someone can help me out!
Edit : posted the question in the wrong section of this forum, my bad.
Kind regards
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