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condition of enable pin when its left floating

Shifali15
New Contributor I
2,266 Views

Hi,

 

What will be the condition of enable pin in EN5339QI if its left floating

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1 Solution
Mostafa_Intel_AE
Employee
2,165 Views

Hello @Shifali15 ,

 

The 10R will help to delay the AVIN ramping from the PVIN during the start up and shutdown and this will help to avoid the UVLO to trigger during the startup incase of the noisy PVIN.

 

Thanks,

Mostafa

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5 Replies
Mostafa_Intel_AE
Employee
2,233 Views

Hello @Shifali15 ,

If EN pin left floating this will cause the part to be off, but there is a chance that the part could startup under that condition if there is any voltage charge (due to any electrostatics) higher than 0.4V on that pin.

Thanks,

Mostafa 

Shifali15
New Contributor I
2,210 Views

Hi Mostafa,

Thankyou for your response. Attached is my layout design. Kindly review the same and provide your valuable feedback.

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Mostafa_Intel_AE
Employee
2,179 Views

Hi @Shifali15 ,

 

So sorry for late response, I have reviewed your layout and looks okay.

I would recommend inserting 10Ohm between AVIN and PVIN.

Also please help to confirm if Enable is connected to AVIN or you are using external signal to trigger the Enable pin.

 

Thanks,

Mostafa

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Shifali15
New Contributor I
2,173 Views

Hi Mostafa,

Thankyou for your response.

I am using external signal to trigger the enable pin.

Also can you let me know the significance of adding this 10ohm resistor.

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Mostafa_Intel_AE
Employee
2,166 Views

Hello @Shifali15 ,

 

The 10R will help to delay the AVIN ramping from the PVIN during the start up and shutdown and this will help to avoid the UVLO to trigger during the startup incase of the noisy PVIN.

 

Thanks,

Mostafa

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