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Using a NE555 for 12V boost to 24V to power an amplifier

I'm trying to draw a supply scheme for a class D integrated amplifier.

It requires 21V to 24V power supply and about 6/7A of current at 24V. The input is a car battery: 10V to 14.4V.

I've a few questions:

Is the NE555 usable for this scope?
How much output current this circuit have?
If the answers to the first two are: "no" and "too low" can you suggest a circuit scheme that it's my case?
EDIT: If you did not understand well, the scheme of this DC boost must be added to the PCB of the amplifier. Also, the output current can also be 3A, i will put two of this circuit in parallel with diodes.

Here is the datesheet of ne555n:www.componentschip.com/.../NE555N.html

What resistance with what value I've to change to get a 21-24V output? Because it is adjustable, and it want fixed.