26 Apr
2011
26 Apr
'11
5:05 p.m.
On 4/26/11 7:59 PM, Bob Bradlee wrote:
I'd like to see the math on that. I have a pretty good grasp of
switching regulators; I've done a lot with them in various designs.
Admittedly only very small ones for portable equipment though, in the
sub-1A range, but the concepts are the same. PWM a transistor between
saturation and cutoff, smooth it out with a capacitor, sample the output
into an error amplifier to control the PWM duty cycle. No load there,
unless you're talking about leakage across the PCB and such.
-Dave
--
Dave McGuire
Port Charlotte, FL
I have
quite a few of them that run just fine without a load. I've
also designed quite a few that also run fine without a load.
There needs to be a small internal load than to maintain bias, there can not be 0
internal and 0 external load.
something about efficency going to infinity.