Rainbow Electronics MAX5961 - Manual (Page 21)

MAX5961
0 to 16V, Quad, Hot-Swap Controller
with 10-Bit Current and Voltage Monitor
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When an overcurrent event causes the MAX5961 to
shut down a channel, a corresponding open-drain
FAULT_ output alerts the system. Figure 3 shows the operation and fault-management flowchart for one
channel of the MAX5961.
Table 6. Specified Current-Sense and Circuit-Breaker Threshold Ranges
ILIM_
INPUT
CURRENT-
SENSE
RANGE (mV)
SPECIFIED FAST-TRIP
THRESHOLD RANGE (mV)
FAST-TRIP/
SLOW-TRIP
RATIO (%)
SPECIFIED
SLOW-TRIP
THRESHOLD RANGE (mV)
200 5.0 to 12.5
175 5.7 to 14.3
150 6.7 to 16.7
Low 0 to 25
10 to 25
(40% to 100%)
(DAC = 0x66 to 0xFF)
125 8 to 20
200 10 to 25
175 11.5 to 28.6
150 13.3 to 33.3
High 0 to 50
20 to 50
(40% to 100%)
(DAC = 0x66 to 0xFF)
125 16 to 40
200 20 to 50
175 22.9 to 57.1
150 26.7 to 66.7
Unconnected 0 to 100
40 to 100
(40% to 100%)
(DAC = 0x66 to 0xFF)
125 32 to 80
Table 7a. sense_range Register Format
Description: Fast-trip threshold maximum range setting bits, from ILIM_ three-state inputs
Register Title: sense_range
Register Address: 0x61
R/W R/W R/W R/W R/W R/W R/W R/W
Ch4_IGS1 Ch4_IGS0 Ch3_IGS1 Ch3_IGS0 Ch2_IGS1 Ch2_IGS0 Ch1_IGS1 Ch1_IGS0
bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0
Table 7b. Setting Current-Sense Range
ILIM_ INPUT STATE Chx_IGS1 Chx_IGS0 MAXIMUM CURRENT-SENSE SIGNAL (mV)
Low 1 0 25
High 0 1 50
Unconnected 0 0 100
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