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SC4541
Applications Information ( continued)
V IN D
2 F S L
The converter has higher efficiency under CCM and the
inductor peak current is calculated by the following
equation.
I L _ PEAK I IN
Assuming CCM, the duty ratio is calculated using the fol-
lowing equation.
A 1 μ F 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
D
V OUT V IN
V OUT V D
V D
Vendor
Kemet
Phone
408-986-0424
Website
www.kemet.com
V D is the forward voltage drop of the internal Schottky
rectifier.
Murata
Taiyo Yuden
814-237-1431
408-573-4150
www.murata.com
www.t-yuden.com
The inductor ripple current is further shown by the follow-
ing equation.
I L _ RIPPLE
V IN D
F S 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
Regulated 5V
Dual Lithium Ion Battery Pack
Three Lithium Ion Battery Pack
Input Voltage
Range
4.5 to 5.5V
5.4 to 8.4V
8.1 to 12.6V
L1 Induc-
tance
10μH
22μH
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.
C OUT
V OUT V IN I OUT
V OUT F S V RIPPLE
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
11
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