Other Parts Discussed in Thread: LM61495
Hi Team,
My customer now use LM61495 in their design. During 500V surge test, the TVS did not burn out. The LM61495 has the following two situations:
(1) When the LM61495 is connected to a load (normally installed, 正常装机), the LM61495 will be burned out;
(2) When the LM61495 is not connected to the load (a separate power supply board, no load单独电源板,没有负载), the LM61495 will not be burned out.
Customer also measured with an oscilloscope that TVS can clamp the voltage at around 32V during the surge test, but the negative pulse voltage will also reach -30V.
Since the absolute maximum rating of 61495 is -0.3 to 42V, I guess because the negative pulse voltage is -30V, so LM61495 is damaged? Could you kindly check any advice about this?
The circuit is shown in the figure below.