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SC183C датащи(PDF) 16 Page - Semtech Corporation

номер детали SC183C
подробное описание детали  2.5MHz, 2A Synchronous Step-Down Regulator
PDF  20 Pages
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производитель  SEMTECH [Semtech Corporation]
домашняя страница  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC183C датащи(HTML) 16 Page - Semtech Corporation

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SC183C
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© 2010 Semtech Corp.
16
OSC
DROOP
LOAD
OUT
f
V
I
C
⋅
∆
⋅
= 3
(4)
The output capacitor RMS current ripple may be calcu-
lated from Equation 5.
(
)


⋅
⋅
−
⋅
=
IN
OSC
OUT
MAX
IN
OUT
RMS
COUT
V
f
L
V
V
V
I
)
(
)
(
3
2
1
(5)
Table 3 lists the manufacturers of recommended output
capacitor options.
C
IN Selection
The SC183C source input current is a DC supply current
with a triangular ripple imposed on it. To prevent large
input voltage ripple, a low ESR ceramic capacitor is
required. A minimum value of 4.7μF should be used. It is
important to consider the DC voltage coefficient charac-
teristics when determining the actual required value. It
should be noted that a 10mF, 6.3V, X5R ceramic capacitor
with 5V DC applied may exhibit a capacitance as low as
4.5mF. To estimate the required input capacitor, determine
the
acceptable input ripple voltage and calculate the
minimum value required for C
IN from Equation 6.
OSC
OUT
IN
OUT
IN
OUT
IN
f
ESR
I
V
V
V
V
V
C
⋅


−
∆


−
=
1
(6)
The input capacitor RMS ripple current varies with the
input and output voltage. The maximum input capacitor
RMS current is found from Equation 7.


−
=
IN
OUT
IN
OUT
RMS
CIN
V
V
V
V
I
1
)
(
(7)
The input voltage ripple and RMS current ripple are at a
maximum when the input voltage is twice the output
voltage or 50% duty cycle.
The input capacitor provides a low impedance loop for
the edges of pulsed current drawn by the PMOS switch.
Low ESR/ESL X5R ceramic capacitors are recommended
for this function. To minimise stray inductance, the capaci-
Applications Information (continued)
tor should be placed as closely as possible to the PVIN and
PGND pins of the SC183C.
Manufacturer
Part Nunber
Value
(μF)
Type
Rated
Voltage
(VDC)
Value
at
3.3V
(μF)
Dimensions
LxWxH
(mm)
Murata
GRM21BR60J106K
10±10%
X5R
6.3
4.74
2.0x1.25x1.25
(EIA:0805)
Murata
GRM219R60J106K
10±10%
X5R
6.3
4.05
2.0x1.25x0.85
(EIA:0805)
Murata
GRM21BR60J226M
22±20%
X5R
6.3
6.57
2.0x1.25x1.25
(EIA:0805)
Murata
GRM31CR60J476M
47±20%
X5R
6.3
20.3
3.2x1.6x1.6
(EIA:1206)
Table 3 – Recommended Capacitors



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