Blame Jinx for reference to site :-)

A new-to-me method of buck regulator control.
Pros and cons.
Claims advantages over 2 loop voltage and current buck regulator
control schemes, which they claim are typical. (1 loop current seems
to work well enough to me mostly).

Obvious in retrospect but Doh! type circuit when you see what they are doing.
No doubt decades old, but ... .

              http://www.allegromicro.com/en/Products/Part_Numbers/6210/6210.pdf

Traditional buck regulator circuit but current sense is placed in
Cathode of output free wheel diode and sensed during switch off
period. Switch is left off until free-wheel "vally" current has
dropped to preset level.

On period is set by Vin and a programming resistor. This means that In
max is implied but not explicitly detected or limited. OK enough as
long as well designed. (Systems that detect and limit switch on
current are inherently protected.)

Many operating graphs but no charts of performance. Claim eg 90%+
efficiency in typical application but give no easy way to judge this
or to see effect or parameter variations.
.


                 Russell
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