ISL6113EVAL1Z データシートの表示（PDF） - Intersil

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ISL6113EVAL1Z

Dual Slot PCI-E Hot Plug Controllers

Intersil 

12VOUT

12IOUT

ISL6113, ISL6114

12VGATE

CFILTER

VAUX

CFILTER

IAUX

FIGURE 14. ISL6113 12VMAIN WOC SHUTDOWN

3VGATE

3 IOUT

CFILTER

3VOUT

FIGURE 16. VAUX OC REGULATION AND SHUTDOWN

VAUX

CFILTER

IAUX

FIGURE 15. ISL6113 3VMAIN WOC SHUTDOWN

The VAUX outputs have a different circuit-breaker function.

The VAUX circuit breakers do not incorporate a fast-trip

detector, instead they regulate the current into a fault to

avoid exceeding their operating current limit. The circuit

breaker will trip due to an overcurrent on VAUX when the

programmable CR duration timer, t expires. This use of

FLT

the t timer prevents the circuit breaker from tripping

FLT

prematurely due to brief current transients. See Figures 16

and 17 for illustrations of the VAUX protection performance

into an over current (OC) and more severe OC condition

respectively. The ISL6113, ISL6114 AUX current control

responds proportionally to the severity of the OC condition

resulting in appropriately fast VAUX pull down and current

regulation until tFILTER has expired.

14

FIGURE 17. VAUX WOC REGULATION AND SHUTDOWN

In the fault latch mode set by leaving L/R pin open, following a

fault condition, the outputs can be turned on again via the ON

inputs (if the fault occurred on one of the MAIN outputs), via

the AUXEN inputs (if the fault occurred on the AUX outputs),

or by cycling both ON and AUXEN (if faults occurred on both

the MAIN and AUX outputs). When the circuit breaker trips,

FAULT will be asserted. In the fault retry mode, set by

grounding the L/R pin the ISL6113, ISL6114 will initiate an

automatic restart about every 1.5s until successful.

The ISL6113, ISL6114 current regulation duration (tFILTER)

is set by external capacitors at the CFILTER pins to GND.

Once the CR mode is entered, the external cap is charged

with a 2.5µA current source to 1.25V. Once this threshold

has been reached the IC then turns-off all fault the related

FETs and sets the FAULT output low. For a desired tFILTER,

the value for CCFILTER is given by Equation 4:

CFILTER = -n---o---m-----i-n-5---a0---l0---t-k-F---Ω-I--L---T----E---R---

(EQ. 4)

FN6457.0

September 25, 2007

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