ON/OFF control
Posted by: treez
on
Hello,
The Peakswitch family have simple to use ON/OFF control and do up to 120 Watts.
Given that they have excellent transient response and regulation, why would anybody ever bother with control loop feedback compensation ever again ?
ON/OFF controllers are far easier and quicker to implement and work just as well.
Also, why is ON/OFF control not done in high power SMPS's ?
That’s why there is a separate vanilla and a separate chocolate ice-cream! Some people just don’t like one or the other!
Like anything else on-off control has its set of advantages and disadvantages. It is true that the loop stability is easier to achieve in on-off control for low level of continuos output power; however at higher continuous output power levels many engineers, myself included, still like to use PWM control based regulation techniques. One potential disadvantage is that at higher power levels, due to the nature of on/off control, there maybe increased audible noise as compared to PWM control ICs like TOPSwitch-HX and TOPSwitch-GX. So there is a point after which PWM based control starts becoming more attractive to engineers.