Electronic Components Datasheet Search
  English  ▼

Delete All
ON OFF
ALLDATASHEET.COM

X  

Preview PDF Download HTML

ISL6115A Datasheet(PDF) 5 Page - Renesas Technology Corp

Part No. ISL6115A
Description  12V Power Distribution Controllers
Download  10 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Maker  RENESAS [Renesas Technology Corp]
Homepage  http://www.renesas.com
Logo 

ISL6115A Datasheet(HTML) 5 Page - Renesas Technology Corp

 
Zoom Inzoom in Zoom Outzoom out
 5 / 10 page
background image
ISL6115A
FN6855 Rev 1.00
Page 5 of 10
April 23, 2010
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.
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.
CURRENT REGULATION DURATION/POWER GOOD
CTIM Charging Current
CTIM_ichg0
VCTIM = 0V
17.2
20.5
25
µA
CTIM Fault Pull-Up Current (Note 6)
-
20
-
mA
Current Limit Time-Out Threshold
Voltage
CTIM_Vth
CTIM Voltage
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.
Electrical Specifications VDD = 12V, TA = TJ = full temperature range, Unless Otherwise Specified.
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
(Note 6)
TYP
MAX
(Note 6) UNITS
TABLE 1. RISET PROGRAMMING RESISTOR VALUE
RISET RESISTOR
NOMINAL CR VTH
10k
200mV
4.99k
100mV
2.5k
50mV
1.25k
25mV
NOTE: Nominal Vth = RISET x 20µA.
TABLE 2. CTIM CAPACITOR VALUE
CTIM CAPACITOR
NOMINAL CURRENT LIMITED
PERIOD
0.022µF
2ms
0.047µF
4.4ms
0.1µF
9.3ms
NOTE: Nominal time-out period = CTIM x 93k.


Html Pages

1  2  3  4  5  6  7  8  9  10 


Datasheet Download




Link URL




Privacy Policy
ALLDATASHEET.COM
Does ALLDATASHEET help your business so far?  [ DONATE ]  

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Alldatasheet API   |   Link Exchange   |   Manufacturer List
All Rights Reserved© Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn