Hi guys, what happens if a buck converter that previously was designed to operate in CCM at full load (max power output) and then I connect a less load lets say 10% of the maximum load?
I simulated this in LTSpice and I can see that the buck converter changes from CCM to CrCM or even DCM also I can see that the ripple current (delta I) on the inductor has a small variation in amplitud (Ipp). but the DC component level of that current has been moved down doing that the inductor passes from CCM to DCM.
1. Does it's normal this behavior?
2. What are the more stress in the MOSFET and freewheeling diode, in CCM, CrCM or DCM?
3. If a controller is designed to control the driver in CCM what happens when the buck enters into DCM mode?
4. And finally, should say that CCM is the more stress in the switching devices?
I attached my simulation if it helps to my questions or if do you have any comment. (Max output power 60W)
Ty so much friends
I simulated this in LTSpice and I can see that the buck converter changes from CCM to CrCM or even DCM also I can see that the ripple current (delta I) on the inductor has a small variation in amplitud (Ipp). but the DC component level of that current has been moved down doing that the inductor passes from CCM to DCM.
1. Does it's normal this behavior?
2. What are the more stress in the MOSFET and freewheeling diode, in CCM, CrCM or DCM?
3. If a controller is designed to control the driver in CCM what happens when the buck enters into DCM mode?
4. And finally, should say that CCM is the more stress in the switching devices?
I attached my simulation if it helps to my questions or if do you have any comment. (Max output power 60W)
Ty so much friends
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