ISL6113 Datasheet, PDF (13/24 Pages) Intersil Corporation – Dual Slot PCI-E Hot Plug Controllers

ISL6113, ISL6114
12V_OUT
12VGATE
12IOUT
CFILTER
C_GD = OPEN
C_GS = OPEN
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_FILTER duration. However, should the load current cause a
V_RSENSE > V_THFAST, the outputs are immediately shut off with
no t_FILTER delay, as shown in Figures 14 and 15. If the
ISL6113, ISL6114 latches off due to the t_FILTER expiring, then
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.
12V_OUT
12VGATE
FIGURE 10. ISL6114 12VMAIN START-UP R_LOAD = 10Ω,
C_LOAD = 470µF
3V_GATE
3V_OUT
12IOUT
C_FILTER
3IOUT
CFILTER
FIGURE 12. ISL6113 12VMAIN CR AND SHUTDOWN
C_GS = OPEN
FIGURE 11. ISL6114 3VMAIN START-UP R_LOAD = 2Ω,
C_LOAD = 470µF
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_THILIMIT (nominally 50mV) drop across
a sense resistor thus exceeding the programmed CR limit, the
3IOUT
3V_OUT
CFILTER
3VGATE
FIGURE 13. ISL6113 3VMAIN CR AND SHUTDOWN
13
FN6457.0
September 25, 2007