TPS22965-Q1: Ipls Rating

Hi Tateo,

Let me answer some of your questions one at a time:

1. They want to make sure about the meaning of Ipls rating. Does this adopt for continuous pulse? In other words which means 15msec period and 300usec 6A peak pulse(pulse<300us,2% duty ciycle)?

[AK] Yes, this is for a continuous pulse, and it would be for a 300us pulse with a minimum period of 15ms.

2. If pulse current exceeds Ipls rating, even though Tj doesn't exceed rating, is there any possibility to destroy the IC? They assume Tj should exceed the rating to damage the IC. They want to know damaged mechanism of the IC by Ipls.

[AK] It is possible to damage a device without having it exceed its maximum junction temperature, and this is from a high amount of current being passed through the device. While overheating is one source of damage, electromigration is another. The maximum current rating of the device is carefully determined based on both power dissipation and electromigration, so exceeding the maximum current ratings for the device put it at risk for damage.

3. If Ipls rating is for continuous pulse, they assume to also say the rating is 850mArms effective value current. Is their understanding correct? In their condition, the continuous pulse like below figure might be occurred. Can the IC survive against this pulse?

[AK] What is the temperature range for this application? Both electromigration and power dissipation ratings are affected by temperature, so knowing this would help with our analysis of the pulse given.

On another note, have you considered using the TPS22966-Q1 with both channels in parallel? This implementation would provide a higher current rating when compared to one TPS22965-Q1 device.

Thanks,

Alek Kaknevicius