Inrush current limiter

Hi Bud,

You can use eFuse and adjust soft start capacitor for inrush current management. Please refer app note www.ti.com/.../slva920.pdf for more information on managing inrush currents for heavy capacitive loads. Send me your voltage and application details to suggest more appropriate solution.

Best Regards,
Rakesh

For 3 phase inverter,.

- 40v 30amp

- since it consists of a capacitor of 2200uf, by connecting to the battery supply it produces spark.

- For temporary purpose we charge the capacitor by

Resister then we remove the resister and connect to the power supply.

- We can not able to use NTC resister to because it will dissipation lot amount of heat and not good for high watts applns.

  Any suggestions friends.

Hi Bud,

LM5069 with external dv/dt start-up circuit (like the one mentioned in front page of the datasheet) would be able to support your application. Please get an EVM and try out. We have design calculator tool at www.ti.com/.../toolssoftware to help in design.

Best Regards,
Rakesh

Thank you sir, that was a good product to use. Is it suitable for my application (1000W), because 30amp will be flowing through it.

I have simulated the module by using texas webench designer , can you explain the simulated graph. I am confused about that.

 - And what is the output current limit  in webench tool.

 - My output will be max of about 30amp but in output current limit option (under webench tools) doesn't increasing above 10amp.

 - Does the output current limit option means the current requires for the capacitive load to charge.

 - Even the mosfet used in the circuit was 100V and 30amp, which is not suitable for my appln.

Correct me friend if i am wrong.

Inrush current limiter means, to slow down the flow of electrons(current) at initial stage in order to charge the capacitor.
And then the current will be at normal flow depends on the application. Can i fulfill this process by using lm5069. Guide me friend.

Hi Bud,

Seems there is some limitation in We-bench tool. I will check with the team.
LM5069 can support 30A in normal operation. Please send me filled up design calculator for review.

Best Regards,
Rakesh

What is the amp capability of this LM5069, because its not mentioned in datasheet.

I want to use a inrush current limiter in my inverter circuit. The specification of the inverter,..

- 40V and 30amp (1000W) Is LM5069 is suitable ? Because on load condition 30 amp will continually flow through this lm5069.

Friend do you want any other information. Waiting fro your reply,.

Hi,

LM5069 is a controller and amp capability of the design depends on the external FET as well. Please verify your design using design calculator www.ti.com/.../toolssoftware , it shows the power level to which the design can support for a particular FET.

Best Regards,
Rakesh

Yes sir I quess that, it depends on the MOSFET.
But when I design by using this tool, the output current limit option does not increasing above 10amp. Could you explain me sir.

Can you please feed-in your system parameters in the attached file and send me.

LM5069_Design_Calculator_REV_C.xlsx

Best Regards,

Rakesh

Sir i attached the file. 

Parameters: 

- Mosfet nce7580 (http://www.dzsc.com/uploadfile/company/332784/201081617837365.pdf)

- Vmin= 20v

- Vmax= 60v

- soft start method (slowly increasing the gate voltage of mosfet to reduce inrush current)

- load 2200uF

- Output current of mosfet will be above 30amp

That it sir.

LM5069 redesigned.xlsx

The attached design sheet is empty, please fill and send me.

Best Regards,
Rakesh