Interleaved sync buck converter (8 bucks into one output)

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treez

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Hello,
Just wondered if anyone knows of a sync Buck converter (preferably from linear.com) which has facility to interleave with 8 other same controllers?
(ie, each one switching 360/8 degrees apart.)
Spec for each buck is:-
Vin=24v, vout=1.5v, iout=12A (each), ton(minimum)<200ns,
(so the entire, collective output is 1.5V & 8*12A)
 

The most common six-phase converters are from Intersil. At least the circuits I've seen up close.
The ISL6398 can be cascaded for up-to 24 phases.
 
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I adapted one of my simulations to your specs. It just so happens that the duty cycle is short enough so it can be rotated through the 8 converters, one after the other.

A 4017 IC (1-of-10 counter) is all it takes to rotate pulses to 8 buck converters. Each turns on for 12.5 percent duty cycle. Total output is 1.5V, 100A.



The switching frequency does not need to be as slow as I have it, of course.

This is vastly simplified from your specs. Nevertheless it is interesting as an experiment, to observe the waveforms, and current levels, that might be expected.
 
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Hi,

With Brad's solution to generate 8 pulses...you could add 8 synchronizeable buck converters.

Klaus
 
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