Part Number: LM5119
Hi.
I have some noise present on the CS and CSG pins of an LM5119 due to adjacent circuitry (another LM5119) switching at inconvenient moments. They are synchronised, so it happens rather predictably.
Adding a 1nF / 100R / 100R differential filter improved the situation dramatically, but there is some residual noise affecting the current measurement. I know this because the input current draw changes (reduces) if the source of noise is removed.
My questions are:
1. What are the maximum permitted values for the differential current sense filter components? I presume that the consequence of lowering the current sense filter bandwidth too far will be reduced accuracy / sensitivity to overcurrent conditions. My switching frequency is 250kHz.
2. Are there any other strategies for reducing the sensitivity to noise of the CS and CSG pins?
Thank you in advance!
Kind regards,
Andrew
Part Number: LM5119
Hello,
Can we use LM5119 as 4 phase operation if we use external oscillator to RT input of LM5119 and 90° phase shifted clock input to other LM5199?
Best Regards,
Ryuji
I'm very comfortable with CCM. Thanks for your help.
Kind regards,
Andrew
Part Number: LM5119
Hi
I am using an interleave circuit using the LM5119.
The output voltage requires OVP.
I'm trying to figure out what to do
I want to add an OVP circuit.
Please let me know if you have a good idea.
Part Number: LM5119
Hello,
When hiccup is disabled and the part is in current limit, will the part continue to operate in current limit indefinitely as long as the load is sufficient?
Regards,
David
Part Number: LM5119
Hi
I'm testing a dual BUCK(13V,18V) by LM5119.
There is no problem with 13v but 18v start a hiccup at no load.
Looking at the data sheet, there seems to be only an over current related to the hiccup.
Can you be a hiccup for another reason?
-test condition
2-ch Buck(LM5119)
Input: DC 66~100V
Output: DC 13V / DC 18V
DC 18V 1A(typ) / 11A(peak)
Part Number: LM5119
Customer wants to use a controller for 12V input, <= 3V output, with 45A constant output current. Can LM5119 achieve this? If not, do you have any other suggested parts? Thank you.
Part Number: LM5119
Dear Madam or Sir,
We have used LM5119 to design a buck converter from 16-60VDC to 12VDC. The target load current is 20A. The schematic is attached. And also the figure of the board.
The test result is as follows.
1. VIN=30VDC, VOUT=12V, Load=2A, board runs 15 hours without problem.
2. VIN>30VDC, VOUT=12V, Load=2A, the output voltage changes from 12V to 8V and then comes back to 12V, and repeats in this way.
Can you please give us some suggestions to diagnose?
Part Number: LM5119
Hi
1. LM5119 is used in customer side, interleave buck, the output is 12V. so customer want that at start up, the internal VCC regulator is used, after 12V is stable, 12V is used to provide VCC power.
On LM5119 EVM, a diode from output to VCC is inserted. customer want to know how to set VCCDIS pin (pin 8)?
2. Diode Emulation Mode is not needed, so customer need to connect DEMB to VCC2. on EVM, this is a resistor R16, but this is no value shown.
do customer need this resistor or connect to VCC2 directly? if R16 is needed, what's the recommended value?
thanks.
