Hi, we are using vnq500peptr-e in one of our products, which was supposed to draw up to 500 mA per load output. The vendor changed the load, and its drawing is 560-580mA. Will the vnq500peptr-e IC handle this, or is there a part with the same pinout and high-current load options?
Greetings,
I’m not sure I understand the question as intended, but it appears that you may be referring to the device’s output short circuit current limiting function, described on p.9 of the datasheet:
Any value of current within the 400-900mA range indicated is within specification. It should be noted that this feature is intended to serve as a protective function in cases of an external fault rather than being relied upon in the course of normal operation. Activation of the short circuit protection function is likely to cause significant power dissipation within the device, resulting in rapid temperature changes and possible thermal shutdown, which are all likely to lead to decreased reliability and unpredictable operation.
Please explain further if the above does not address your question.
Hi,
Thanks for the clarification. Just to confirm my understanding: if the load on each channel draws up to 600 mA max, that falls well within the 400–900 mA short‑circuit current limit range specified in the datasheet, so we should be operating within spec.
We are not intending to rely on the short‑circuit protection in normal operation; this is simply to make sure our expected load current is not a concern from a device capability standpoint.
Please let me know if I’m interpreting this correctly.
Best,
Mehwish
The current limit spec in the datasheet indicates that the protection function will activate at a load current somewhere between 400 and 900mA. To be assured that it won’t activate in an unwanted manner, connected loads must draw less than 400mA.
Your ~600mA load lands in the gray area between reliable function and guaranteed failure (just as a ~500mA load would have been) but is moving in the direction of the latter. It’s conceivable that a person might still get away with it depending on the actual nature of the situation, but it seems like a rather risky design choice that a person might prefer to avoid.