ISL6112 Datasheet, PDF (13/31 Pages) Intersil Corporation – Dual Slot PCI-Express Power Controller

ISL6112
3V_GATE
3V_OUT
.
12V_OUT
3I_OUT
12I_OUT
12V_GATE
C_FILTER
C_FILTER RESPONDING TO UNSHOWN MAIN SUPPLY
C_GATE = 2200pF
FIGURE 6. 3VMAIN START-UP R_LOAD = 2Ω, C_LOAD = 470µF
12V_OUT
12V_GATE
12I_OUT
C_FILTER
C_GD = 9800pF
C_GS = 2200pF
FIGURE 7. 12VMAIN START-UP R_LOAD = 10Ω,
C_LOAD = 470µF
Current Regulation (CR) Function
The ISL6112 provides a current regulation and limiting
function that protects the input voltage supplies against
excessive loads, including short circuits. When the current
from any of a slots MAIN outputs exceeds the current limit
threshold (I_LIM = 50mV/R_SENSE) for a duration greater than
t_FILTER, the isolation protection is tripped and both related
MAIN supplies are shut off, as shown in Figures 8 and 9.
Should the load current cause a MAIN outputs V_SENSE to
exceed V_THFAST, the outputs are immediately shut off with
no t_FILTER delay, as shown in Figures 10 and 11.
C_FILTER
FIGURE 8. 12VMAIN CR AND SHUT-DOWN
C_FILTER
3I_OUT
3V_OUT
3V_GATE
FIGURE 9. 3VMAIN CR AND SHUT-DOWN
12V_OUT
12I_OUT
12V_GATE
C_FILTER
FIGURE 10. 12VMAIN WOC SHUT-DOWN
13
FN6456.0
September 28, 2007