ISOM8110: CMTI for this part

Shawn Workman

Genius 14290 points

Part Number: ISOM8110
Other Parts Discussed in Thread: ISOM8710, ISO7741

What is the CMTI for the ISOM8110?

over 1 year ago

0 Andrew J over 1 year ago

TI__Mastermind 22015 points

Hello Shawn,

Thank you for looking into ISOM8110.

CMTI used to specify a digital output's immunity to common-mode transients. As a result, CMTI is specified in our digital isolators such as ISO7741 and ISOM8710. Since ISOM8110 is an analog behavior opto-emulator, CMTI is not a specified datasheet parameter.

Best,
Andrew

0 Shawn Workman over 1 year ago in reply to Andrew J

TI__Genius 14290 points

OK, so they are immune to transients then?

0 Andrew J over 1 year ago in reply to Shawn Workman

TI__Mastermind 22015 points

Yes, ISOM8110 will have immunity to Common-mode transients across the isolation barrier (from side 1 to side 2 Ground).

0 Shawn Workman over 1 year ago in reply to Andrew J

TI__Genius 14290 points

Can it handle a +/-2400V 80uS duration, 1Joule pulse applied to the output of a an isolated flyback?

How about +/-1000V for 150uS, 310mJ?

+/-500V for 250uS, 100mJ?

+/-100V for 1.12mS, 11mJ?

Will there be any odd behavior, damage, breakdown, or large transients seen on the primary side of the supply under this condition?

Shawn

+1 Andrew J over 1 year ago in reply to Shawn Workman

TI__Mastermind 22015 points

Hello Shawn,

This test sounds like you are trying to meet a specific standard for isolation. We certify our isolation devices to the industry's most common standards. The resulting information can be found in Section 7.4 Insulation Specifications of the datasheet.

Based on the information provided above, I believe VIOTM is the most relevant spec. Which you can read about here (+) [FAQ] What is Withstand Isolation Voltage (VISO) and Maximum Transient Isolation Voltage (VIOTM)?

If you would like more detail on each of these specs, you can consult (+) [FAQ] [H] High-Voltage Isolation Parameters for more details.

Best,
Andrew

Isolation

Isolation forum

ISOM8110: CMTI for this part