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|23rd June 2011, 11:54 AM||#1|
Join Date: Jun 2011
Problem with using UC3855: Low output Voltage
I am trying to use UC3855 (or UC2855) from TI, but i have a problem with output voltage. Some informations:
My main inductor is 200uH, ZVT inductor at about 10uH, STW45NM50 for main MOSFET and STW20NM50 for ZVT MOSFET (both of them are driven with ACPL-H312-000E), STTH6012 for main Diode and DSEI30-10A for the ZVT circuit.
In the tests i am doing now, i use as load 1KW. For whatever input voltage i apply, from 85 to 240V, i haven't seen the output Voltage going above 300V. However, switching of the MOSFETS seems to be correct (using a scope).
I also have problem with the temperature of the ZVT inductor (in just 1 min of working, the temperature of the core goes to almost 100oC).
Has anybody who used UC3855 noticed anything similar in output voltage?
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