GFR1K5 Datasheet, PDF (27/29 Pages) XP Power Limited – 1U Blind-Mate Hotswap Redundant

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(IOUT_OC_FAULT_LIMIT) Current Limit Set Point 46h
The IOUT_OC_FAULT_LIMIT command sets the value of the output current, in percents, that causes the over-current detector
to indicate an over-current fault condition. The two data bytes are HEX respresentation of the decimal in percentage, ie. 120%
current limit, DEC2HEX (120d) = 0078h. Once an over-current occurred, the power supply will go to hiccup mode,
OFF-time = 10 ms, On-time = 100 ms.
(IOUT_OC_FAULT_RESPONSE) Current Limit Fault Response 47h
The IOUT_OC_FAULT_RESPONSE command instructs the device on what action to take in response to an output over-current fault.
The register function is given below:
Bits
Description
7:6
Response to OC Trip
5:3
Retry Setting
2:0
Delay Time
Value
00
01
10
11
000
001-110
111
000-111
Meaning
Do nothing, continue to supply output voltage until hardware OC trip point
activates, (Default setting).
Do nothing, continue to supply output voltage until hardware OC trip point
activates, (Default setting).
Do nothing, continue to supply output voltage until hardware OC trip point
activates, (Default setting).
The power supply shuts down and responds as programmed by the Retry
setting in bits 5:3.
A zero value for the retry setting means that the unit does not attempt to
restart. The output remains disabled until the fault is cleared as mentioned in
the Status/Control section.
The power supply attempts to restart the number of times set by these bits.
The minimum number i ≤1 (001) and the maximum number is 6 (110). The on
time for the retries is set at 10 ms. If the unit turns on during the retry the fault
is cleared and the unit operation normally. Once the number of retries is
reached the unit shuts down until the fault is cleared as mentioned in the
Status/Control Section.
The power supply attempts to restart continuously without limitation until it is
commanded to turn off via the On/Off command (01h register) or AC power is
cycled.
Not implemented.
Resetting the over-current function
There are two ways to get the power supply out of the over-current mode once the unit has latched off:
1. Cycle the AC input power.
2. Using the ON/OFF command from the OPERATION (01h) register.
If the power supply is in continuous retry mode, the supply will turn back to normal operations if the load is decreased below the over-
current fault limit setting.
10011388 revision B
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