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ISL6120CBZA Datasheet(PDF) 6 Page - Intersil Corporation

Part # ISL6120CBZA
Description  Power Distribution Controllers
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Manufacturer  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL6120CBZA Datasheet(HTML) 6 Page - Intersil Corporation

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6
February 6, 2007
Application Considerations
During the soft-start and the time-out delay duration with the
IC in its current limit mode, the VGS of the external N-Channel
MOSFET is reduced driving the MOSFET switch into a (linear
region) high rDS(ON) state. Strike a balance between the CR
limit and the timing requirements to avoid periods when the
external N-Channel MOSFETs may be damaged or destroyed
due to excessive internal power dissipation. Refer to the
MOSFET SOA information in the manufacturer’s data sheet.
When driving particularly large capacitive loads a longer soft-
start time to prevent current regulation upon charging and a
short CR time may offer the best application solution relative
to reliability and FET MTF.
Physical layout of RSENSE resistor is critical to avoid the
possibility of false overcurrent occurrences. Ideally, trace
routing between the RSENSE resistors and the IC is as direct
and as short as possible with zero current in the sense lines
(See Figure 1).
Using the ISL6116 as a -48V Low Side Hot
Swap Power Controller
To supply the required VDD, it is necessary to maintain the
chip supply 10 to 16V above the -48V bus. This may be
accomplished with a suitable regulator between the voltage
rail and pin 5 (VDD). By using a regulator, the designer may
ignore the bus voltage variations. However, a low-cost
alternative is to use a Zener diode (See Figure 2 for typical
5A load control); this option is detailed below.
Note that in this configuration the PGOOD feature (pin 7) is
not operational as the ISEN pin voltage is always < UV
threshold.
See Figures 17 to 20 for waveforms relevant to -48V and
other high voltage applications.
Biasing the ISL6116
Table 3 gives typical component values for biasing the
ISL6116 in a
±48V application. The formulas and
calculations deriving these values are also shown below.
When using the ISL6116 to control -48V, a Zener diode may
be used to provide the +12V bias to the chip. If a Zener is
used then a current limit resistor should also be used.
Several items must be taken into account when choosing
values for the current limit resistor (RCL) and Zener Diode
(DD1):
• The variation of the VBUS (in this case, -48V nominal)
• The chip supply current needs for all functional conditions
• The power rating of RCL.
• The current rating of DD1
Formulas
1. Sizing RCL:
RCL = (VBUS,MIN - 12)/ICHIP
2. Power Rating of RCL:
PRCL = IC(VBUS,MAX - 12)
3. DD1 Current Rating:
IDD1 = (VBUS,MAX - 12)/RCL
CORRECT
TO ISEN AND
CURRENT
SENSE RESISTOR
INCORRECT
FIGURE 1. SENSE RESISTOR PCB LAYOUT
RISET
TABLE 3. TYPICAL VALUES FOR A -48V HOT SWAP
APPLICATION
SYMBOL
PARAMETER
RCL
1.58k
Ω, 1W
DD1
12V Zener Diode, 50mA Reverse Current
VBUS
LOAD
ISL6116
PWRON
NC
FIGURE 2.
-48V
RCL
DD1
12V
1.58k
Ω
1W
0.01µF
0.047µF
1.47k
Ω
0.005
1%
0.001µF
2k
Ω
1%
ISL6115, ISL6116, ISL6117, ISL6120


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