ADuM5000 DC isolation voltages

takayuki-nozawa on Mar 6, 2017

I have a question for ADuM5000 DC isolation voltage.

The requirement from the customer is DC isolation voltage 3000V.

And my assumption is as follow. Is this correct?

[My assumption]:

ADuM5000 Isolation voltage is 2500V rms at 1 min.

But each ADuM5000W is proof tested by applying an insulation test voltage ≥ 3000 V rms for 1 sec(page5 on the data sheet ,comment 1)

The wave form of these test is bipolar AC , but the performance for DC is better than bipolar AC.

So, ADuM5000 meet isolation voltage for DC 3000V at 1sec.

Best regards

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on Mar 6, 2017 8:48 PM
Hi:

Yes, I agree that the ADuM5000 certified for 25000Vrms with a 3000Vrms 1 sec test should meet a 3000VDC test as the performance for DC is better than AC.

Regards, Brian
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on Mar 6, 2017 9:39 PM
I had a typo - 25000Vrms should be 2500Vrms.

Brian
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0 takayuki-nozawa on Mar 7, 2017 5:21 AM

Hello Brian-san

Thank you for quickly reply.

I will answer 3000Vrms 1 sec for 3000VDC test to the customer .

Best regards

Nozawa
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0 EVAN_2013 on Mar 7, 2017 5:48 PM

Hi Brian

How long time can ADUM5000W meet 3000V DC test? 1 second or minute ?

Our customer requires 3000V DC test for 1 minute.

Thank you for youer support !

Evan
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on Mar 7, 2017 8:18 PM
Evan: The ADuM5000 can be used for a 3000VDC 1 min test. We have tested ADuM5xxx for 3000VDC for > 1 year without failure.

Regards, Brian
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0 EVAN_2013 on Mar 9, 2017 10:25 AM

Hi Brian

Thank you for your reply.

Does the min and max specification of ADUM5000W setpoint include output ripple and noise?

Best regards

Evan
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on Mar 9, 2017 8:11 PM
Evan:

VISO at max load (80mA) is specified >4.5V so the load regulation will be within the 4.7V to 5.4V range .

Regards, Brian
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0 EVAN_2013 on Mar 13, 2017 10:35 AM

I may not express myself correctly.

Our customer wants to calculate the min and max of Viso_out including ripple and noise, so they have some question as below:

1. Does min and max of setpoint include output ripple and noise?

If not, they will add half of output ripple and noise to their calculation.

2. what is the relationship with setpoint, output ripple, output nosie, like below?

2. Do you have any example about how to calcultate the min and max of Viso_out using above parameter?

I may not understand those parameter corrently, hope you can help me.

Thank you very much!
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on Mar 13, 2017 5:11 PM
Evan: Your diagram is correct about the relationship of output ripple and noise and the setpoint. The output ripple and noise values on your PC board needs to be in added to the setpoint value. The datasheet output ripple and noise are typical specifications, not a min and max spec. The reason for this is output ripple and noise can vary with output load, PC board layout, the placement of bypass capacitors, the value of the bypass capacitors and the ground plane and power plane layout and spacing between the layers.

Regards, Brian
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0 EVAN_2013 on Mar 14, 2017 4:51 AM

Hi Brain

I understand, and thank you for your support!

Evan
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