Showing posts with label LT1213. Show all posts
Showing posts with label LT1213. Show all posts

Wednesday, May 2, 2018

555-s based SMPS test

as is ...


... in practice it requires a sharper or more discrete response for larger errors -- this one could do for relatively steady load -- a bad point here is that increasing the controls' sophistication impacts either on efficiency at light loads - - - or retail tech. such as in SMPS controllers where the dev. of such is expensive and won't pay off for prototype solutions . . .


+ an update to the schematic in the prev. post


no pwm just switching test
*

[Eop]

Tuesday, May 1, 2018

SMPS experimental test

MC33063 -- 9V to 5V


Custom -- 9V to 5V with the uni-polar or basically the ON-OFF control


. . . the uni-polar to bi-polar PWM control signal formation block (essential tests)



!! update !!

Random feedback circuitry . . . is "doable" test ::


The bi-polar control circuit -- occasionally skips to 800kHz mode::


With modified MOS-Fet drive stage -- without feedback stays at 166kHz



[Eop]