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ISL6115 Datasheet(PDF) 7 Page - Intersil Corporation

No. de pieza ISL6115
Descripción Electrónicos  Power Distribution Controllers
Download  13 Pages
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Fabricante Electrónico  INTERSIL [Intersil Corporation]
Página de inicio  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL6115 Datasheet(HTML) 7 Page - Intersil Corporation

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7
FN9100.7
April 29, 2010
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 in the
following equations.
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
Sizing RCL is expressed in Equation 1:
Power Rating of RCL is expressed in Equation 2:
DD1 current rating is expressed in Equation 3:
Example:
A typical -48V supply may vary from -36 to -72V.
Therefore:
VBUS,MAX = -72V
VBUS,MIN = -36V
ICHIP = 15mA (Max)
Sizing RCL is expressed in Equation 4:
Power rating of RCL is expressed in Equation 5:
DD1 current rating is expressed in Equation 6:
TABLE 3. TYPICAL VALUES FOR A -48V HOT SWAP
APPLICATION
SYMBOL
PARAMETER
RCL
1.58kΩ, 1W
DD1
12V Zener Diode, 50mA Reverse Current
VBUS
LOAD
ISL6116
PWRON
NC
FIGURE 2. TYPICAL 5A LOAD CONTROL
-48V
RCL
DD1
12V
1.58kΩ
1W
0.01µF
0.047µF
1.47kΩ
0.005
1%
0.001µF
2kΩ
1%
R
CL
V
BUS MIN
() 12
I
CHIP
-------------------------------------------
=
(EQ. 1)
(EQ. 2)
P
RCL
I
C VBUS MAX
() 12
()
=
(EQ. 3)
I
DD1
V
BUS MAX
() 12
()
R
CL
--------------------------------------------------
=
(EQ. 4)
R
CL
V
BUS MIN
() 12
()
I
C
------------------------------------------------
=
R
CL
36
12
0.015
-------------------
=
R
CL
16k
Ω TypicalValue
1.58k
Ω
=
[]
=
(EQ. 5)
P
RCL
I
C VBUS MAX
() 12
()
=
P
RCL
0.015
() 72 12
()
=
P
RCL
0.9W TypicalValue
1W
=
[]
=
(EQ. 6)
I
DD1
V
BUS MAX
() 12
()
R
CL
--------------------------------------------------
=
I
DD1
72
12
()
1.58k
Ω
------------------------
=
I
DD1
38mA TypicalValue
12Vrating, 50mA reverse current
=
[]
=
ISL6115, ISL6116, ISL6117, ISL6120


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