I am testing the LP8758-E0 evaluation board.
My application needs a controlled and fast emergency power down sequence (thanks to Intel, former Altera)
I tested with different sizes of capacitive loads: 1000uF, 500uF, 20uF, 22uF
With a small capacitive load the chip discharges with the programmed slew rate until about 0.7V
and then releases the load and optionally enables the internal load pull down resistor.
With huge capacitive loads the chip has a limitation in dicharge slew rate.
I seems to be current limited of about 2A.
This current limit seems to be independent of the I2C inductor current limitation setting.
If a slew rate is programmed which exceeds this current,e.g. 1000uF and > 1.9mV/us,
then the chip starts discharging with about 2 to 2.5 A but releases
the load before reaching the finial dischage voltage of about 0.7V
If I power down more channels at once, can I rely on the maximum
2A dischage on every channel or is it a thermal switch off which reduces the over all discharge current ?
Thanks !
Ingmar
