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SC493 Datasheet(PDF) 19 Page - Semtech Corporation

Part # SC493
Description  EcoSpeedTM Step-down Controller with I2C Interface
PDF  28 Pages
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Manufacturer  SEMTECH [Semtech Corporation]
Direct Link  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC493 Datasheet(HTML) 19 Page - Semtech Corporation

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SC493
19
Applications Information (continued)
L
OUT
IN
INJ
R
V
V
I
The following describes one way to design the virtual ESR
circuit.
2
1
2
1
SW
C
L
R
R
R
R
f
2
1
C
C
The current through resistance R
L will all go through CL and
the voltage change through capacitor C
L will be shown by
the next equation.
L
ON
L
OUT
IN
INJ
C
t
R
V
V
V
All of this voltage will be coupled into the FB pin if the
rules previously stated are followed. Note that the output
ripple voltage has not been taken into account. The
output voltage ripple will also be coupled through the C
L
and C
C path into the FB pin. The ripple voltage at the
output due to the output capacitance (ignoring the
capacitance ESR) is shown by the next equation.
SW
OUT
RIPPLE
RIPPLE
_
COUT
f
C
8
I
V
The ripple due to the capacitance ESR alone is shown
by the next equation.
V
ESR_RIPPLE = IRIPPLE x RESR
The output ripple voltage due to output capacitance has
a 90° phase lag with respect to the ripple voltage gener-
ated by the virtual ESR. The actual ripple voltage seen at
the FB pin (VFB_RIPPLE) can be approximated by the next
equation.
2
RIPPLE
_
COUT
2
RIPPLE
_
ESR
INJ
RIPPLE
_
FB
V
)
V
V
(
V
Resistor Divider Selection
The DC voltage at the FB pin is shown by the next equation.
2
V
V
5
.
0
V
RIPPLE
_
FB
FB
The resistor divider value should be selected using the
next equation.
2
2
1
FB
OUT
R
R
R
V
V



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