LM5118: I want to see if you can help me

jesus britoloaiza

Prodigy 60 points

Part Number: LM5118

Hi TI experts...

I have a design with these parameters:

Vin = 12 V - 48 V

Vout = -12 V

Iout = 3 A

i want to put a inrush current circuit in my Vin, can you give me any recommendation about that.

over 1 year ago

0 jesus britoloaiza over 1 year ago

Prodigy 60 points

sorry the parameters are

VIN = 12 V - 48 V

Vout = 12 V

Iout = 5 A

+1 EM over 1 year ago in reply to jesus britoloaiza

TI__Genius 11215 points

Hello,

Thanks for reaching out. Is your controller hitting current limit during start up? What exactly do you want the circuit to do, do you need to limit the inrush current? If yes, to which value? Would it be a possibility to increase the soft start time or decrease the output capacitance? We're looking forward hearing from you.

Kind regards,

0 jesus britoloaiza over 1 year ago in reply to EM

Prodigy 60 points

sorry, press that my doubt has been solved by mistake.

I have an ITECH IT7624 power supply, and when I am powering the LM5118 at more than 15 V and turn on, the ITECH IT7624 power supply protects itself, I assume it is the inrush current.

how could I solve this? any ideas?

+1 EM over 1 year ago in reply to jesus britoloaiza

TI__Genius 11215 points

Hello,

Thanks for your feedback. If you cannot increase the current setting of the power supply, you might try to increase the soft start time of the LM5118, reduce its output capacitor. Alternatively, you might want to add a current limiter like this one: https://www.ti.com/product/LMP8646

Kind regards,
EM

Power management

Power management forum

LM5118: I want to see if you can help me