Customer is having trouble with the overcurrent protection of the device.
Input voltage @ 21.6V, output voltage @ 30V.
When they use an electronic load to change the output load, they can keep increasing it until just under 7A. At this output current, the device fails completely, and Vin is shorted to GND. They see the same scenario when the short the output to GND. The device "breaks".
The amount of current to cause this to happen was measured at the output, but the maximum current the internal N-Ch MOSFET can sink is, according to the DS, typically around 6.6A.
But the datasheet says there is overcurrent protection, as in "7.3.3 Overcurrent Protection and Frequency Foldback".
There is some talk about the error amplifier and the oscillation frequency set by an external resistor...could there be a situation where the current limit doesn't kick in?
As a bonus: any help on the function for the overcurrent module would be appreciated...or an app note for a similar device / feature with more details.
I have some waveforms I can share, if contacted via email directly.
Darren
