Other Parts Discussed in Thread: PMP10594, TLV272
Dear Sirs.,
I write to receive Help to find a method for determining the best COMPENSATING network connected to COMP pin, so the LM5176 can work fine on the entire VIN (10V-30V) and VOUT (11V-32V) ranges.
I must use the LM5176 as battery charger for 12V and 24V batteries, so my input voltage can be from 10V to 30V and the same for the output voltage, clearly the Vout is dinamically changed injecting a current on the FB network and I used the same current limit method on the Application Note SNVA846 + PMP10594 demo board. I must adapt the current limiting value and Vout based on the application field and situations but with the same hardware.
I'm using a switching frequncy of about 100kHz (82kOhm on RT pin) and what happen is that at NO LOAD I can ear an audible noise on the bulck capacitors or on power inductor, the same with some load conditions (5A, 10A etc...) and Vout values combinations. But if I set a Vout that at NO Load don't emit noise and the gate signals are stable, for example 15V in the output with 12.3V in the input, I can add load to the charger up to 750W wihout any problems, and it reamin stable and supply a very large amount of power with a very stable Vout.
I tested many combinations of Compensation Network values, but I have Always stability problems or for some Vout-Vin values and then also during curren limiting by external circuit with TLV272 opamp.
Since I can't satbilize it for a simple 12V battery charger with input range from 10V to 16V and Vout form 11V to 15V my question is could it works stable for a larger Vin and Vout and Load current ranges? Can I trust on this BUCK-BOOST Controller or I should choose another one, for my project?
Could you help me in this hard goal (for me)?
Thank you in advance!