LM5170-Q1: LM5170 transient issue

Jimmy Lai

Expert 6845 points

Part Number: LM5170-Q1
Other Parts Discussed in Thread: LM5170

Dear Team,

We can't meet customer Transient Response spec (40A-60A)?

Could you guide us how to fine tune? Thanks a lot!

Many Thanks,

Jimmy

over 1 year ago

0 Feng Ji over 1 year ago

TI__Genius 11335 points

Hi Jimmy,

Generally, increase the bandwidth and output capacitance would improve load transient.

Please use the spreadsheet of LM5170 as a start point. We can then see if there is still room to increase the bandwidth.

And some waveforms would be also helpful.

Best Regards,

Feng Ji

0 Jimmy Lai over 1 year ago in reply to Feng Ji

TI__Expert 6845 points

Hi Feng,

I have added output capacitance and adjust the COMP1 circuit.

I will keep try another way to improve the output capacitance.

Many Thanks,

Jimmy

0 Feng Ji over 1 year ago in reply to Jimmy Lai

TI__Genius 11335 points

Hi Jimmy,

Please fill in the spreadsheet so I can have a better view of the application. You are adjusting current loop by adjust COMP1 circuit. You should also consider adjusting the voltage loop.

LM5170DESIGN-CALC - Copy.xlsx

Best Regards,

Feng Ji

+1 Feng Ji over 1 year ago in reply to Jimmy Lai

TI__Genius 11335 points

Hi Jimmy,

I hope you have made progress with your design and measurements.
As there has been no further comments, I will close this thread for now.
If you have additional questions, please reply below to re-open the thread.
Otherwise feel free to click the resolved button.

Best Regards,

Feng Ji

Power management

Power management forum

LM5170-Q1: LM5170 transient issue