T
treez
Guest
Hello,
We are designing a +/-48V , 400W Power supply for a Class D, Bass guitar amplifier supply.
The +48V rail will simply be supplied by the output of an offline, 48V PSU bought off-the-shelf.
The –48V rail will be provided from the same +48V rail by putting it through an inverting buckboost converter as in the diagram and LTspice simulation below.
The problem is that we need it to be synchronous. (Use a FET across the output diode).
Normal synchronous controller IC’s are for synchronous buck or synchronous boost converters and can’t be used with inverting buckboost converters like we have here.
Therefore, we need an IC which will drive the power FETs and have a variable dead time, then we can add the gate drivers and gate_drive_isolators ourselves. Most of the relevant driver ICs have dead time which is far too short, and can’t be used with the external gate driver ICs that we will be using, since gate driver ICs have relatively long turn-on delay times which would result in overlap and “shoot-through”.
So do you know of eg a synchronous buck driver IC which has adjustable dead time? Such an IC could be used by us for this inverting buckboost.
We are designing a +/-48V , 400W Power supply for a Class D, Bass guitar amplifier supply.
The +48V rail will simply be supplied by the output of an offline, 48V PSU bought off-the-shelf.
The –48V rail will be provided from the same +48V rail by putting it through an inverting buckboost converter as in the diagram and LTspice simulation below.
The problem is that we need it to be synchronous. (Use a FET across the output diode).
Normal synchronous controller IC’s are for synchronous buck or synchronous boost converters and can’t be used with inverting buckboost converters like we have here.
Therefore, we need an IC which will drive the power FETs and have a variable dead time, then we can add the gate drivers and gate_drive_isolators ourselves. Most of the relevant driver ICs have dead time which is far too short, and can’t be used with the external gate driver ICs that we will be using, since gate driver ICs have relatively long turn-on delay times which would result in overlap and “shoot-through”.
So do you know of eg a synchronous buck driver IC which has adjustable dead time? Such an IC could be used by us for this inverting buckboost.