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Technical Brief 457
ISL6173 (+3.3V & +2.5V) Figures (Continued)
BOTH CHANNELS I CR = 2.2A
BOTH CHANNELS I WOC = 6.6A
BOTH CHANNELS I CR = 2.2A
BOTH CHANNELS I WOC = 6.6A
CH2 GT1
CH2 GT1
CH1 VO1
CH4 I LOAD3.3V
CH3 CT1
CH1 VO1
CH3 CT1
CH4 I LOAD3.3V
FIGURE 49. OC IN RESET MODE
BOTH CHANNELS I CR = 2.2A
BOTH CHANNELS I WOC = 6.6A
CH4 (EN2)’
CH1 VO1
FIGURE 50. RESPONSE TO WOC
CH3 (EN1)’
CH2 VO2
FIGURE 51. TURN OFF VIA (EN)’
ISL6111 (+12V, -12V, +3.3V, +5V)
Figures 52 and 53 show the ISL6111 PCI Hot Plug power
switch controller. This IC provides power control for the four
legacy supplies (+12V, -12V, 3.3V, 5V) to a PCI or PCI-X
slot. The +12V and -12V switches are integrated, while the
higher power 3.3V and 5V lines require external N-channel
FETs.
Refer to Figures 54 and 55. Though on different time scales,
both figures show the same event; Figure 54 shows all four
output voltages ramping up, and Figure 55 gives detailed
information pertaining to a single rail (+3.3V) at startup.
There is a 1 ? resistive load on the +3.3V output.
17
Refer to Figures 56 and 57. Though on different time scales,
both figures show the same event; Figure 56 shows all four
output approaching GND, and Figure 57 gives detailed
information pertaining to a single rail (+3.3V) at shutdown by
EN. There is a 1 ? resistive load on the +3.3V output.
Both Figures 58 and 59 show the same event, each with a
different set of details. Note that PGOOD goes low as soon
as 3.3VS drops, but FLTLN waits until CR mode has expired.
The nominal time-out period for this device is CTIM x 150k ? .
Turning on into a direct short, the +3.3V section of the
controller goes immediately into CR mode until CRTIM times
out. The nominal time-out period for this device is CTIM x
150k ? (see Figure 46).
TB457.0
April 18, 2006
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