ISL6115AEVAL1Z Intersil, ISL6115AEVAL1Z Datasheet - Page 5

• Manufacturer Part Number: ISL6115AEVAL1Z
• Description: EVAL BOARD 1 FOR ISL6115A
• Manufacturer: Intersil

Specifications of ISL6115AEVAL1Z

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Electrical Specifications
NOTES:
CURRENT REGULATION DURATION/POWER GOOD
C
C
Current Limit Time-Out Threshold
Voltage
Power Good Pull Down Current
6. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits established by
TIM
TIM
Description and Operation
The ISL6115A is targeted for +12V single power supply
distribution control for generic hot swap switching
applications.
This ICs features a highly accurate programmable
current regulation (CR) level with programmable time
delay to latch-off, and programmable soft-start
turn-on ramp all set with a minimum of external
passive components. It also includes severe OC
protection that immediately shuts down the MOSFET
switch should a rapid load current transient such as
with a dead short cause the CR Vth to exceed the
programmed level by 150mV. Additionally, it has an
UV indicator and an OC latch indicator. The
functionality of the PGOOD feature is enabled once
the IC is biased, monitoring and reporting any UV
condition on the ISEN pin.
Upon initial power-up, the IC can either isolate the
voltage supply from the load by holding the external
N-Channel MOSFET switch off or apply the supply rail
voltage directly to the load for true hot swap capability.
The PWRON pin must be pulled low for the device to
isolate the power supply from the load by holding the
external N-Channel MOSFET off. With the PWRON pin
held high or floating the IC will be in true hot swap
mode. In both cases the IC turns on in a soft-start
mode protecting the supply rail from sudden inrush
current.
At turn-on, the external gate capacitor of the
N-Channel MOSFET is charged with a 11µA current
source resulting in a programmable ramp (soft-start
turn-on). The internal ISL6115A charge pump supplies
the gate drive for the 12V supply switch driving that
gate to ~V
external current sense resistor. When the voltage
across the sense resistor exceeds the user
programmed CR voltage threshold value, (see Table 1
for R
nominal current regulation threshold voltage, V
the controller enters its current regulation mode. At
characterization and are not production tested.
Charging Current
Fault Pull-Up Current (Note 6)
ISET
PARAMETER
programming resistor value and resulting
DD
+6.5V. Load current passes through the
5
V
DD
= 12V, T
C
SYMBOL
C
TIM
PG_Ipd
TIM
_ichg0
_Vth
A
= T
J
CR
= full temperature range, Unless Otherwise Specified.
)
ISL6115A
V
CTIM Voltage
V
CTIM
OUT
TEST CONDITIONS
= 0.5V
= 0V
this time, the time-out capacitor, on CTIM pin is
charged with a 20µA current source and the controller
enters the current limit time to latch-off period. The
length of the current limit time to latch-off duration is
set by the value of a single external capacitor (see
Table 2) for C
nominal current limited time-out to latch-off duration
placed from the CTIM pin (pin 6) to ground. The
programmed current level is held until either the OC
event passes or the time-out period expires. If the
former is the case then the N-Channel MOSFET is fully
enhanced and the C
C
period has expired, an internal latch is set whereby
the FET gate is quickly pulled to 0V turning off the
N-Channel MOSFET switch, isolating the faulty load.
NOTE: Nominal Vth = R
NOTE: Nominal time-out period = C
This IC responds to a severe overcurrent load (defined
as a voltage across the sense resistor >150mV over
the OC Vth set point) by immediately driving the
N-Channel MOSFET gate to 0V in about 10µs. The gate
voltage is then slowly ramped up turning on the
N-Channel MOSFET to the programmed current
regulation level; this is the start of the time-out period.
C
TIM
TIM
TABLE 1. R
R
0.022µF
0.047µF
charges to ~1.8V signaling that the time-out
CAPACITOR
0.1µF
ISET
TABLE 2. C
4.99kΩ
1.25kΩ
2.5kΩ
10kΩ
RESISTOR
ISET
TIM
capacitor value and resulting
PROGRAMMING RESISTOR VALUE
(Note 6)
TIM
TIM
NOMINAL CURRENT LIMITED
17.2
MIN
ISET
1.6
-
-
capacitor is discharged. Once
CAPACITOR VALUE
x 20µA.
20.5
TYP
NOMINAL CR VTH
1.8
PERIOD
20
TIM
8
4.4ms
9.3ms
2ms
x 93kΩ.
200mV
100mV
50mV
25mV
(Note 6) UNITS
MAX
2.1
25
-
-
April 23, 2010
FN6855.1
mA
mA
µA
V