LM5116-12EVAL: Output is abnormal,there is an oscillation in output during the switch.

Jason Cao

Prodigy 140 points

Part Number: LM5116-12EVAL
Other Parts Discussed in Thread: LM5116

Vin = 15V Vout = 12V Iload = 1A(With or without JMP1 waveform doesn't change)

And why the waveform is so different from the one in the datasheet?

over 1 year ago

0 EricLee over 1 year ago

TI__Mastermind 46211 points

Hello Jason

Based on the waveform which you attached, the output load current is not small enough to enter the DCM which is in Fig11. Would you please reduce the output current ?

-Eric Lee

0 Jason Cao over 1 year ago in reply to EricLee

TI__Prodigy 140 points

Iout = 0.01A,and LM5116 is Diode Emulation Mode.

But it is still FCCM.

0 EricLee over 1 year ago in reply to Jason Cao

TI__Mastermind 46211 points

Hello Jason

It's inductor current waveform in DCM. Please compare your waveform with the IL waveform in the Figure 11.

- Eric Lee

Power management

Power management forum

LM5116-12EVAL: Output is abnormal,there is an oscillation in output during the switch.