Sold by our agentHT9464andHT9464MBoth Viso withstand isolation voltage and Viotm maximum transient isolation voltage tests can be completed. This article mainly introduces the test methods of Viso and Viotm.
definition：
Viso-Withstand isolation voltage–The isolator can handle the maximum AC root mean square (RMS) isolation voltage for one minute without breakdown.
Viotm-Maximum transient isolation voltage-The peak isolation voltage specified by the manufacturer, which characterizes its isolation tolerance for one-minute transient overvoltage.
Define the source：
The withstand isolation voltage Viso is derived from the UL 1577 standard, and the maximum transient isolation voltage Viotm is derived from the IEC 60747-17 (VDE 0884-17) standard. The figure below shows the test requirements of Viso and Viotm for a certain digital isolator.
How to test Viso withstand isolation voltage?
- During the qualification test, use the HT9464 or HT9464M sold by our company to verify the withstand isolation voltage by applying a sinusoidal stress for 60 seconds at the claimed withstand voltage value.
- During production testing, 1.2*V is applied ISOThe sinusoidal stress for one second.
How to test the maximum transient isolation voltage of Viotm?
The maximum transient isolation voltage has passed the “Method a” test and “Method b” test verification of HT9464 or HT9464M respectively for conformity testing and production testing.
Why are these tests important?
Events such as arcs or load changes on the power supply may cause the voltage on the isolation barrier to be much higher than the expected operating voltage. It is important that the isolator will not be damaged during these brief high-voltage events. The isolator should be able to withstand a brief voltage increase and continue to work normally after the expected operating voltage is restored. Withstand voltage Viso quantifies the maximum RMS voltage that the isolator can support for 60 seconds, and the maximum transient isolation voltage Viotm quantifies the maximum peak voltage that the isolator can support for 60 seconds.
The difference between Viso and Viotm：
The main difference between the withstand isolation voltage Viso and the transient isolation voltage Viotm is the unit used to define the specification. The withstand isolation voltage is defined as the RMS voltage value, while the maximum transient isolation voltage is defined as the peak value. For sinusoidal stress, the isolation withstand voltage is usually the same as the maximum transient isolation voltage.
- Creation date: May 8, 2024
- Revision date: May 8, 2024