Hi
I meet some problem when I use LM5116 for 12V to 5V converter. I add a 10KΩ resistance between DEMB PIN to GND.
When Iout =0.5A LM5116 works well . But I gradually reduce the output current when the IC works in FCCM mode the the current is strange.there is a transition in L current's falling.
Can you give me some advice to remove it ?
Best Regards
Carry
Hi EL
I take the detail about last picture
In addition
I try to connect DEMB to GND directly. In principle, LM5116 would always run in diode emulation. But I find LO pin turn on sometimes.and the HO PIN output is also strange.
Channel 2 is HO pin
Channel 3 is LO PIN
Channel 4 is Current in L
I wash there are having some useful information for you
Regards
Carry
Hi EL
I use
Cramp = 560pF
Ccomp = 15nF
Rcomp = 4.8K
Chf = 150pF
but the condition is even worse.
later I use
Cramp = 1nF
Ccomp = 15nF
Rcomp = 4.8K
Chf = 150pF
the flowing is wave
and I use
Cramp = 1.5nF
Ccomp = 15nF
Rcomp = 4.8K
Chf = 150pF
I ddid not connect Channel 2
if I use
Cramp = 2.2nF
Ccomp = 15nF
Rcomp = 4.8K
Chf = 150pF
the wave didn't stabe
I use Mathcad to calculate the Cramp
am I right?
Ragards
Carry
Hi EL
I am so sorry about that I made a mistake. the COMP doesn't connect to GND. Because there are a lot of jumper in Schematic ,So I remove it for intuition. And I
add GND to COMP uncarefully.
it's the original schematic
JP4 short ; JP5 open ; JP6 open ; JP7 short ; JP8 open ; JP9 short ; JP10 open ; JP12 open
I am so sorry about wasting your valuable time because of my carelessness
Regards,
Carry
