Has anyone had any issues with LM5160 evaluation board LM5160DNTFBKEVM?
Using the LM5160 calculator spreadsheet, I modified the following components to model my intended application:
R4 -> 170kΩ (to set ripple voltage feedback).
R7 -> 160kΩ (to set switching frequency to 300kHz).
R8 -> 2.7kΩ (to set primary output voltage to ~4.7V).
T1 -> 1:1, 100μH coupled inductor (744877101).
The issue is that the load regulation on the secondary/isolated output is extremely poor:
|Load Resistor||Targeted Load @ 4.3V||Measured Vprim||Measured Vsec|
Can anyone advise?? Since the primary side is well-regulated, I'm suspicious of the transformer, but I don't see anything about it that violates the design guidelines.