Hello,
could you pls simulate the LM5249-Q1 and tell me the exact accuracy of line regulation and load regulation?
The configuration is shown below, thank you for your support!
Mingkang,
We cannot give exact load/line regulation for the system.
On your board you can have variances due to layout or noise.
In ideal cases the load regulation should be close to 0.1% and the line regulation should 1%
You can see this in our EVM, LM5149-Q1EVM-400.
Also remember that PFM mode will have higher output voltage ripple.
Hope this helps,
-Orlando
Hi Orlando, thanks for your reply!
When we tested the inductor ripple current, we found that there was a periodic spike in the current flowing through the inductor. Please help analyze the cause. Thank you!
Input voltage: 24V/36V, Output voltage: 14.68 V, current: Around 1.2 A, current limit setting: 4 A (shunt: 15 mΩ)
1. at input voltage of 24V and 36V, respectively, there are current spikes at different intervals (36-V current spikes are spaced approximately 30 ms, 24-V is approximately 183 ms)
2.observe the details of the current waveform and the current change is in accordance with the set buck switching frequency (T=2.14us) as follows:
Supply voltage 36 V:
Supply voltage 24V:
Hi Orlando,
The Bode plot is as follows, both amplitude margin and phase margin should be sufficient.
Now we are using active EMI, later we will disable the active EMI and test. Why is active EMI likely to cause this problem?
