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SC4541 데이터시트(PDF) 11 Page - Semtech Corporation

부품명 SC4541
상세설명  High Frequency LED Driver with Integrated Schottky and Simple Interconnect
PDF  19 Pages
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제조업체  SEMTECH [Semtech Corporation]
홈페이지  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC4541 데이터시트(HTML) 11 Page - Semtech Corporation

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SC4541
11
Applications Information ( continued)
A 1µF ceramic input and output capacitor should be ade-
quate for most applications. Larger capacitance reduces
voltage ripple, overshoot and undershoot during load
transient as well as improving loop stability margin.
Recommended ceramic capacitor manufacturers are
listed in Table 1.
Table 2 — Recommended Ceramic Capacitor
Manufacturers
Vendor
Phone
Website
Kemet
408-986-0424
www.kemet.com
Murata
814-237-1431
www.murata.com
Taiyo Yuden
408-573-4150
www.t-yuden.com
The converter has higher efficiency under CCM and the
inductor peak current is calculated by the following
equation.
L
F
2
D
V
I
I
S
IN
IN
PEAK
_
L
Assuming CCM, the duty ratio is calculated using the fol-
lowing equation.
D
OUT
D
IN
OUT
V
V
V
V
V
D
V
D is the forward voltage drop of the internal Schottky
rectifier.
The inductor ripple current is further shown by the follow-
ing equation.
L
F
D
V
I
S
IN
RIPPLE
_
L
The recommended inductance shown in Table 1 is based
on operation with regulated 5V input, dual Li-ion or three
Li-ion battery packs. Increased inductance is required for
higher input and output voltage configurations.
Table 1 — Inductance Requirements, Driving 6 bWLED
Input Type
Input Voltage
Range
L1 Induc-
tance
Regulated 5V
4.5 to 5.5V
10µH
Dual Lithium Ion Battery Pack
5.4 to 8.4V
22µH
Three Lithium Ion Battery Pack
8.1 to 12.6V
33µH
Output Capacitor Selection
Ceramic capacitors are placed near IN and OUT pins to
ground in order to minimize ripple voltage. The minimum
capacitance needed for a given ripple can be estimated
using the following equation.
RIPPLE
S
OUT
OUT
IN
OUT
OUT
V
F
V
I
V
V
C
V
RIPPLE = Peak to peak output voltage ripple
I
OUT = Output current
V
OUT = Boost output voltage
V
IN = Input voltage
F
S = Switching frequency



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