lm2577 3a power supply
Recently I develop one Buck-Boost Power Supply for automotive environment using LTC3780 controller. For some reasons, my PCB layout was made with only two sides. Even using very large tracks with interconexion vias, my design presented a poor result with lot of noise in all signal and power tracks.
In first time, for evaluate the prototype, I supply my board with one conventional power supply at 16.0V nominal and when I turned on I hear a small noise from inductor and the audible frequency noise varied as varied the entry (between 08 to 30VDC). Checking my circuit, I suspect of inductor value, then I changed for 4.70uH (before was 7.8uH) and rising the LTC3780 controller frequency for 400kHz. The noise decreased, but other power loosing increasing like the temperature of inductor and input and output electrolyte capacitors. Then I put load (pure resistive load, 6R) and take measurement in some points, using one same scope reference (the load reference). The output voltage even was 12.3VDC, but the noise as varied the input voltage changed between 2.0 to 3.5VDC
Someone here have the same experience with this controller?
Thanks, Gorkin.