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FAN5608 Scheda tecnica(PDF) 8 Page - Fairchild Semiconductor

Il numero della parte FAN5608
Spiegazioni elettronici  Serial / Parallel LED Driver with Current-Regulated, Step-Up DC/DC Converter
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Produttore elettronici  FAIRCHILD [Fairchild Semiconductor]
Homepage  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FAN5608 Scheda tecnica(HTML) 8 Page - Fairchild Semiconductor

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© 2006 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN5608 Rev. 1.0.5 • 8/8/06
8
Typical Characteristics
TA=25C, VBAT = 3.6V, unless otherwise specified.
Figure 11. Peak power efficiency
Figure 12. PWM Dimming
Startup Response
VIN=3.6V, L=6.8uH, COUT=4.7uF, 3-LEDs/CH
Tim e 200µS/Div
Figure 13. Startup Response
Design and Component Selection Guidelines
Inductor Selection
The inductor is one of the main components required by
the boost converter to store energy. The amount of
energy stored in the inductor and transferred to the load
is controlled by the regulator, using pulse-frequency
modulation (PFM) and pulse-skipping techniques. In most
cases, the FAN5608 operates in discontinuous conduction
mode, resulting in higher inductor current ripple.
To ensure proper operation of the current regulator over
the entire range of conditions, select the inductor based
on the maximum output power (POUT) and the minimum
input voltage (VIN):
OUT
IN
P
T
V
L
×
2
)
(
EQ 6
where units of L, VIN, and POUT are in μH, Volt, and Watt,
respectively and T = 0.4μs is a factor depending upon
the
FAN5608
internal
architecture.
The
above
relationship is applicable up to POUT = 0.8W and
H
L
μ
2
.
2
. At lower inductor values, the efficiency


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