[time-nuts] LTC3780 Buck-Boost Regulator upgrade for HP5065A and others applications

timeok at timeok.it timeok at timeok.it
Fri May 20 05:21:17 UTC 2016


May be can be helpful.....

The LTC3780 is a high performance buck-boost switching regulator controller that operates from input voltages above, below or equal to the output voltage.

I have planned to use it as pre-regulator in the HP5065A.


Datasheet:
http://www.datasheetcatalog.com/datasheets_pdf/L/T/C/3/LTC3780.shtml

example on e-bay:
http://www.ebay.com/itm/LTC3780-DC-5-32V-to-1V-30V-10A-Automatic-Step-Up-Down-Regulator-Charging-Module-/221953001309?hash=item33ad6e075d:g:ObMAAOSwys5WWQQ5


The Chinese manufacturer has implemented the possibility of setting the under voltage which is a very important function . Unfortunately the transition from on and off is not net but presents uncertainties due to the fact that there is no provision in the hysteresis on the  voltage comparator ( 1/2 LM358 ) .
Adding the hysteresis of about 0.8 volt operation is much more reliable . Solder a 470k Ohm between the pin 5 and 7 of the LM358.
With a minimum input voltage adjusted to 21.8 V shutdown occurs at 19.5 V.


Luciano
www.timeok.it
 





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