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Interface and Isolation

Q&A ADUM5401 Startup

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ADUM5401 Startup

kabekami on Nov 15, 2019

Hi ,

We are looking at ADUM5401 for a replacement for ISOW7841.

I have one quick question, The TI part requirest the device to be powered within 10 ms of UVLO.

But the circuit that we are looking at takes 200 ms from UVLO to 90 %.

Do you have details with regards to the slew rate?

Thanking you

With best regards and wishes

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ADIApproved
Nov 21, 2019 in reply to kabekami +1 verified
Kabekami-san: The ADuM5401W datasheet describes the recommended version for startup, as shown below:

The ADuM5401W-1/ADuM5402W-1/ADuM5403W-1 versions of the isolators provide an upgraded voltage reference…

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0 kabekami on Nov 21, 2019 12:11 PM

Hi,

Could you also let me know VISO START-UP ISSUES details in Auto grade?

Do this working has no effect on the non-auto device also.

Thanking you

With regards
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on Nov 21, 2019 1:58 PM in reply to kabekami
Kabekami-san: The ADuM5401W datasheet describes the recommended version for startup, as shown below:

The ADuM5401W-1/ADuM5402W-1/ADuM5403W-1 versions of the isolators provide an upgraded voltage reference to ensure proper startup under all load conditions (see the Ordering Guide for more information).

There is no issue known for startup with these versions.

Regards, Brian
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0 kabekami on Nov 22, 2019 12:44 AM in reply to ADIApproved

Hi Brian,

Thanking you for the information.

I am planning to use the non Auto part for my project.

And my slew rate for power-up sequence it in 100ms order. Does the non-auto part does not have a voltage reference?

Thanking you

With best regards and wishes
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on Nov 22, 2019 2:28 PM in reply to kabekami
Kabekami:

The non-auto part has a reference but it was revised and has no known start issues.

Regards, Brian
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on Nov 22, 2019 2:28 PM in reply to kabekami
Kabekami:

The non-auto part has a reference but it was revised and has no known start issues.

Regards, Brian
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