LM5576: LM5576 has no output signal

Raymond He

Expert 1990 points

Part Number: LM5576

dear

my customer use LM5576, Input voltage =48v, output voltage=12v, normal out current is 400ma with load ,but now there has no output signal ,Is there any good advise for this prroblem? thanks in andance

over 5 years ago

0 Andy Chen over 5 years ago

TI__Mastermind 33935 points

Hi Raymond,

Pls test each pin voltage and compare it with EVM.

Pls upload the circuit and PCB layout for checking.

B R

Andy

0 Andy Chen over 5 years ago

TI__Mastermind 33935 points

Hi Raymond,

How about your application issue? Pls upload circuit and PCB layout for more detail checking if problem still existing.

B R

Andy

0 Raymond He over 5 years ago in reply to Andy Chen

Expert 1990 points

Hi andy

Sorry reply late

Aattachment is LM5576 SCH and PCB，please check，thanks

0 Andy Chen over 5 years ago in reply to Raymond He

TI__Mastermind 33935 points

HI Raymond,

How about ESR of C31?

Pls try below component value:

R65=6.8K, C77=18nF, C79=520pF.

Connect C74, C75 GND to U14 ground pane directly with short and thick wire.

B R

Andy

Power management

Power management forum

LM5576: LM5576 has no output signal