ISL6114 Intersil Corporation, ISL6114 Datasheet - Page 13

• Manufacturer Part Number: ISL6114
• Description: (ISL6113 / ISL6114) Dual Slot PCI-E Hot Plug Controllers
• Manufacturer: Intersil Corporation

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Current Regulation (CR) Function
The ISL6113, ISL6114 provides a current limiting function that
protects the input voltage supplies against excessive current
loads, including short circuits during turn-on (MAIN supplies
shown in previous Figures 3 through 11) and during static
operation for both MAIN (Figures 12 through 15) and AUX
supplies (Figures 16 and 17). When during static operation, any
load current causes >V
a sense resistor thus exceeding the programmed CR limit, the
FIGURE 10. ISL6114 12VMAIN START-UP R
FIGURE 11. ISL6114 3VMAIN START-UP R
C
C
LOAD
LOAD
= 470µF
= 470µF
THILIMIT
13
(nominally 50mV) drop across
C
C
C
LOAD
GD
GS
GS
LOAD
= OPEN
= OPEN
= OPEN
= 2Ω,
= 10Ω,
CFILTER
CFILTER
12IOUT
3IOUT
12VGATE
3V
12V
3V
OUT
GATE
ISL6113, ISL6114
OUT
ISL6113, ISL6114 enters its CR mode where it regulates the
load current to the programmed level by modulating the gate of
the related FET switch into the linear region of operation to
maintain 50mV across the sense resistor for the programmed
t
V
no t
ISL6113, ISL6114 latches off due to the t
the FETs are turned-off more aggressively than if signaled from
the linear region with approximately 80mA of GATE current to
ensure faster isolation from the voltage bus. This is also true
when turning off from a WOC event.
FILTER
RSENSE
CFILTER
FILTER
12V
12IOUT
FIGURE 12. ISL6113 12VMAIN CR AND SHUTDOWN
FIGURE 13. ISL6113 3VMAIN CR AND SHUTDOWN
duration. However, should the load current cause a
OUT
> V
delay, as shown in Figures 14 and 15. If the
THFAST
, the outputs are immediately shut off with
3IOUT
3V
OUT
FILTER
expiring, then
September 25, 2007
3VGATE
12VGATE
C
FILTER
FN6457.0