My customer has 2 questions regarding the expected performance of the ISO7241A:
1) Table on p3. Maximum Working Insulation Voltage is 560V, while V-peak isolation is 4KV. Can you help me understand the difference. If we expect to see 1KV at 125 deg C, will the device work?
2) Above the graph on p13. Anomaly discussion recommends use of appropriately sized capacitor. What is recommended?
Sorry , I had to check out the new graphic capability. It works.
By the way, below is an isolator life time comparison.
The expression "working voltage" or "Viorm" is the voltage across the isolation barrier ( or from input to output) for the entire, rated life time of the isolator. In this case 560Vpk, or 400Vrms, as stated in the TI and the ADI data sheets, can be applied to the TI isolator for 28 years, and for the ADI isolator < 10 years.
The expression "isolation voltage" is the same I/O voltage across the isolation barrier, only that it is much higher (4kVrms), and therefore can conly be applied for a short duration. Again, our isolators can take 4kVrms for 3.3hrs, while ADI's last for 15min.
At 1kV, ours last 4.3 yrs, and ADI's only 0.1 yr.
I also attached our new isolator training guide. As you will see, our new ISO74xx family totally displaces ADI in low-power, high-bandwidth and longevity.
Regards, Thomas
