Soft-Stop Window - Analog Devices ADP1055-EVALZ User Manual

ADP1055-EVALZ User Guide

SOFT-STOP WINDOW

Similar to the soft-start window, the soft-stop window features
a graphical representation of the TOFF_DELAY, TOFF_MAX,
and TOFF_FALL commands. The Additional Settings window
provides a space to program the blanking of faults during soft
stop. Settings for the SR phase in speeds to facilitate soft stop
from light load mode are also available here.
Figure 33. Soft-Stop Window
The settings can be changed in a simple drag-and-drop fashion
and or by checking/unchecking the checkbox. Changes take
place immediately and are stored in the RAM of the IC, but
need to be saved to EEPROM for permanent storage.
Figure 34. Soft Stop at 20 A Load
Yellow Trace: Load Current
Green Trace: Output Voltage
Red Trace: SR1
When soft stop is initiated from light load mode, SR1 and SR2
are initially off. However, to facilitate soft stop they turn on to
discharge the live bus at a controlled rate. The speed at which
they turn on and phase in turn soft stop is selectable.
The soft-stop process starts once the SRs have finished phasing
in. An additional option of extended SR on time can be selected
to ensure that the output voltage stays at 0 V.
Figure 35. Soft Stop from Light Load Mode
Figure 36. Soft Stop with SR on Time Extension (8 ms)
Things to Try
1. Change the soft-stop timing in the soft-start window.
2. Adjust/change the blanking of faults during soft stop.
3. Perform a soft start from light load mode with a fast SR
phase in speed.
Rev. B | Page 13 of 43
Green Trace: Output Voltage
Blue Trace: Hardware PSOFF
Green Trace: Output Voltage
Red Trace: SR1
UG-710