Measuring Feedback Loop from flyback

edwinmarte — Tue, 11 Oct 2016 15:24:11 GMT

Hello All,

a few days ago I received a Isolated universal mains flyback converter demo board (TEA1721ADB1061). My main intention was to measure the Feedback Loop. I am using the analog discovery analyzer with isolation transformer. I inserted a 22 ohm in series with R3 (from schematic) to be able to inject a signal.

I placed a 1000 ohm load across the 12V output, I measured 13.48V constant in that output. My problem is that when I touch the 22 ohm resistor, the feedback loop, with the scopes probe the output voltage drops suddenly to 0.3-0.8 Volts. I haven't been able to make any measurements.

I wanted to be able to measure the feedback loop to check if this controller will satisfy an application e are working on. In the data sheet there is no much information compensation , how it works or how it colud be done. Anybody has any more information besides the one provided by data sheet of TEA1721?

Any help appreciated,

Edwin

Other NXP ProductsのトピックMeasuring Feedback Loop from flyback

Measuring Feedback Loop from flyback