LM2832: input current when the output is shorted.

Thank you for contacting us.

We understand that the average input current to VIN during output short-circuit is “0.8A”.

We apologize for the additional questions, but we would like to confirm the following:

1. Is the above “0.8A” value listed on the datasheet?
2. The above is the average input current, but is there a maximum value?
3. In the datasheet, ICL: Switch Current Limit is “3.25Atyp”, which I think is the threshold of the input current that stops the output, but in what case does it occur?

(Note) The purpose of this inquiry is that there is an inductor on the input side of the circuit, and we are considering a substitute because it is scheduled to be EOL. We think that the rated current should be determined by the maximum current flowing into the power IC. (We initially asked because we thought the current value would be MAX in the event of an output short circuit) We would also like to hear about the points to consider when changing the power IC.

Thank you

お返事ありがとうございます。
1で「0.8A」と理解しています。は、シミュレーションを行って決定される値です。

2&3はシミュレーションを実行して、VIN側のインダクタの最大値を求めます。
これは実装されていると理解しております。
安全上の理由から、3.5Aのインダクタが提案されました。
電源ICのスイッチ電流制限(3.25A)でも問題ありませんか?

電源ICを変更する場合(例えば、TPS7A88、TPS82084)は、各ICの電流制限値を参照してください。
そうしてもよろしいですか?
TPS7A88...LIM:1.7A typ、TPS82084...LIMF:4.6A(標準)

連絡が遅くなり申し訳ございません。

Hi Osamu,

Could you kindly share your question in English?

Best regards,

Varun

I am very sorry. You can check it below.

I understand that "0.8A" in 1. is a value confirmed by running a simulation. We believe that 2&3 has run a simulation and confirmed the maximum value of the current flowing to the VIN side. Also, for safety reasons, we proposed a 3.5A inductor. Is there no problem with the switch current limit (3.25A) of the power supply IC?

When changing the power supply IC (e.g., TPS7A88, TPS82084), it is described in the data sheet of each IC. This will confirm whether it is okay to consider an inductor near the current limit value. TPS7A88...LIM:1.7A typ, TPS82084...LIMF:4.6A (standard)

thank you.

Thank you for contacting Varun. I'm sorry I didn't ask you properly.

You recommended the 3.5A inductor.

I understand that you said 3.5A for safety, but Is it okay to use an inductor with a switch current limit of 3.25A?

Also, if it is OK, when considering inductors with other power ICs, Should I make a selection based on the current limit value in the data sheet?

thank you.

Hi Osamu,

It should be ok to use an inductor with a 3.25A saturated current rating. The same approach can be used for choosing inductors for other power ICs as well. Inductors with saturation current greater than or equal to the IC current limit in the data sheet can be chosen.

Best regards,

Varun