nidare
Junior Member level 1
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Hello!
I'm looking at a integrated buck design that in some corner cases will have to tolerate low dropout and the duty-cycle will approach ~90%.
There is a duty-limit circuit that will limit to roughly 90% but I see that the low-side gate-driver signal dies out right before reaching this limit in some corners, while the high-side gate-driver propagates all the way to the limit.
I have tried tweaking the lower side gate-driver to be able to propagate the narrow ON-pulses at 90% but this comes with some other negative consequences.
So my question then becomes:
What are the consequences of allowing the low-side gate-driver to die out at high duty-cycle, such that it is only the high-side output being toggled on and off?
I'm looking at a integrated buck design that in some corner cases will have to tolerate low dropout and the duty-cycle will approach ~90%.
There is a duty-limit circuit that will limit to roughly 90% but I see that the low-side gate-driver signal dies out right before reaching this limit in some corners, while the high-side gate-driver propagates all the way to the limit.
I have tried tweaking the lower side gate-driver to be able to propagate the narrow ON-pulses at 90% but this comes with some other negative consequences.
So my question then becomes:
What are the consequences of allowing the low-side gate-driver to die out at high duty-cycle, such that it is only the high-side output being toggled on and off?