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PDF ISL6115A Data sheet ( Hoja de datos )
| Número de pieza | ISL6115A | |
| Descripción | 12V Power Distribution Controllers | |
| Fabricantes | Intersil Corporation | |
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12V Power Distribution Controllers
ISL6115A
This fully featured hot swap power controller targets
+12V applications. The ISL6115A with its integrated
charge pump has a higher (6.5V vs 5V) gate drive
than its sister part the ISL6115 making this part an
immediate efficiency improvement replacement.
This IC features programmable overcurrent (OC)
detection, current regulation (CR) with time delay to
latch-off and soft-start.
The current regulation level is set by 2 external
resistors; RISET sets the CR Vth and the other is a
low ohmic sense resistor across, which the CR Vth is
developed. The CR duration is set by an external
capacitor on the CTIM pin, which is charged with a
20µA current once the CR Vth level is reached. The
IC then quickly pulls down the GATE output latching
off the pass FET.
Features
• HOT SWAP Single Power Distribution Control for
+12V
• Overcurrent Fault Isolation
• Programmable Current Regulation Level
• Programmable Current Regulation Time to
Latch-Off
• Rail-to-Rail Common Mode Input Voltage Range
• Enhanced Internal Charge Pump Drives N-Channel
MOSFET gate to 6.5V above IC bias.
• Undervoltage and Overcurrent Latch Indicators
• Adjustable Turn-On Ramp
• Protection During Turn-On
• Two Levels of Overcurrent Detection Provide Fast
Response to Varying Fault Conditions
• 1µs Response Time to Dead Short
• Pb-Free (RoHS Compliant)
Applications
• Power Distribution Control
• Hot Plug Components and Circuitry
Application Circuits - High Side Controller
+ LOAD
-
18
2 ISL6115A 7
36
45
PWRON
PGOOD
OC
+12V
+V SUPPLY TO BE CONTROLLED
April 23, 2010
FN6855.1
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2008, 2010. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL6115A
Electrical Specifications
PARAMETER
VDD = 12V, TA = TJ = full temperature range, Unless Otherwise Specified.
SYMBOL
TEST CONDITIONS
MIN
(Note 6)
TYP
MAX
(Note 6) UNITS
CURRENT REGULATION DURATION/POWER GOOD
CTIM Charging Current
CTIM Fault Pull-Up Current (Note 6)
Current Limit Time-Out Threshold
Voltage
CTIM_ichg0
VCTIM = 0V
CTIM_Vth
CTIM Voltage
17.2
20.5
25
µA
- 20 - mA
1.6 1.8 2.1 V
Power Good Pull Down Current
PG_Ipd
VOUT = 0.5V
- 8 - mA
NOTES:
6. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits established by
characterization and are not production tested.
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 ~VDD +6.5V. Load current passes through the
external current sense resistor. When the voltage
across the sense resistor exceeds the user
programmed CR voltage threshold value, (see Table 1
for RISET programming resistor value and resulting
nominal current regulation threshold voltage, VCR)
the controller enters its current regulation mode. At
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 CTIM capacitor value and resulting
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 CTIM capacitor is discharged. Once
CTIM charges to ~1.8V signaling that the time-out
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.
TABLE 1. RISET PROGRAMMING RESISTOR VALUE
RISET RESISTOR
10kΩ
NOMINAL CR VTH
200mV
4.99kΩ
100mV
2.5kΩ
50mV
1.25kΩ
25mV
NOTE: Nominal Vth = RISET x 20µA.
TABLE 2. CTIM CAPACITOR VALUE
CTIM CAPACITOR
0.022µF
NOMINAL CURRENT LIMITED
PERIOD
2ms
0.047µF
4.4ms
0.1µF
9.3ms
NOTE: Nominal time-out period = CTIM x 93kΩ.
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.
5 FN6855.1
April 23, 2010
5 Page | ||
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| PDF Descargar | [ Datasheet ISL6115A.PDF ] | |
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