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Hi

I am FAE in Japanese distributor.

Our customer will use ADP1614ACPZ-1.3 with Vin=5V Vout=7V.

They want to use ADP1614ACPZ-1.3 with the inductonce current limit of 1A.

I confirmed that Rcl valuse =170kohm can achieved 1A limit by LTSPICE.

But Dataheet shows Rcl Valure from 60kohm to 150kohm.

Can our customer use 170kohm to Rcl?

Best regrards

N.Kokubo

Parents
• Hi N. Kokubo,

The MIN current limit peak of 154K resistor is 0.95A. You may consider this in your 1A peak limit application.

I don't have answer yet if using 170K. I will get back to you when I have one.

• Hi N. Kokubo,

Another approach is to understand why customer want a peak current limit of 1A to see what Rcl value to use by establishing these info: maximum output load current, minimum VIN, & if there's preferred inductor (inductance, MPN, size, etc.). Once you have these, you can see what the maximum peak input current will be (average input current + Iripple/2). Then you will want to add some margin to this, and use this calculated number as the minimum value for the Peak Current Limit. The Peak Current Limit will then need to be set to be about 40% higher than this minimum, as datasheet show current limit has quite a wide spread.

Once you have chosen the Rcl resistor for this, you might then to go back and check what the maximum peak current limit is going to be, and make sure that the inductor can cope with this without saturating.

• Hi  Fil san

But I want to know maximum Rcl value.

If not, coul you please tell me Rcl =170kohm is accoeptable or not.

Best regards

N.Kokubo

• For now, I won’t recommend going above what’s in data sheet graph. Please go first with the questions we need to understand from customer then we will review later how high RCL is needed.

• Hi

Our customer does not tell us why he needs to 1A inductance current.

He chaged it form 1A to 1.1A.

LTSPICE simulation result shows Rcl=160Kohm for 1.1A.

Data shhet shows 154kohm is OK.

What kind of problems can be considered if the number exceeds 154kohm?

Best regards

N.Kokubo

• I can verify with designer later but please understand first the customer requirement so we give them the right solution.

• Hi

I have Web meeting with our customer today.

But Our cutomer does not know the reason of the peak current limit.

End customer does not tell the reason to our customer clearly.

I close this question

Best regards

N.Kokubo

• Hi

I have Web meeting with our customer today.

But Our cutomer does not know the reason of the peak current limit.

End customer does not tell the reason to our customer clearly.

I close this question

Best regards

N.Kokubo

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