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FAN5608DMPX Arkusz danych(PDF) 8 Page - Fairchild Semiconductor

Numer części FAN5608DMPX
Szczegółowy opis  Serial/Parallel LED Driver with Current-Regulated, Step-Up DC/DC Converter
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Producent  FAIRCHILD [Fairchild Semiconductor]
Strona internetowa  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FAN5608DMPX Arkusz danych(HTML) 8 Page - Fairchild Semiconductor

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PRODUCT SPECIFICATION
FAN5608
8
REV. 1.0.3 6/28/04
Application Information
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 PWM and pulse skipping techniques. In most
cases the FAN5608 operates the inductor in discontinuous
conduction mode.
To ensure proper operation of the current regulator over the
entire range of conditions, select the inductor based on the
maximum required power (POUT) and the minimum input
voltage (VIN).
where units of L, VIN, and POUT are in µH, Volt, and Watt,
respectively and F = 0.4 is a factor depending upon the
FAN5608 architecture.
The above relation is applicable up to POUT = 0.6W and
L = 4.3
µΗ , or greater. At lower inductor values the effi-
ciency decreases due to the resistive loss in the switching
Power FET. Using L = 4.3
µΗ and increasing the load to 12
LED x 20mA (POUT = 800mW) requires VIN > 3.5V to
maintain a constant 20mA current through LEDs. The induc-
tor L = 4.3
µH ensures proper operation for 2 x 4 white LEDs
with 20mA at 3.5V for VIN > 2.8V.
For any lighter load or higher VIN, the inductance can be
increased to improve the system efficiency. Application
examples are given in Figure 1 through Figure 4.
The peak current in the inductor is:
which gives the maximum rated current for the inductor. For
L = 4.3
µH, TON_Max = 1.25µS and VIN_Max = 4.2V, the
inductor saturation current should be at least 1A.
Capacitor Selection
Low ESR capacitors should be used to minimize the input
and output ripple voltage. Use of CIN = 4.7µF/6.3V and
COUT = 4.7µF/25V type X5R/X7R multi layer ceramic
capacitor is recommended.
A larger value input capacitor placed as close as possible to
FAN5608 may be needed to reduce the input voltage ripple
in noise sensitive applications. An additional LC filter
between the battery and the FAN5608 input can help to
further reduce the battery ripple to the level required by a
particular application.
Schottky Diode Selection
The FAN5608HMPX and FAN56508MPX require the use of
an external Schottky diode. This diode should be rated at
200mA to 500mA average rectified current and 20V
maximum repetitive reverse voltage.
The MBR0520L (Fairchild) Schottky diode is
recommended.
Driving Higher Current LEDs
To increase the LED current range to 50mA, the CH1 and
CH2 outputs may be connected, as shown below:
L
V
IN
()
2
F
×
P
OUT
--------------------------
<
I
T
ON_Max
V
IN_Max
×
L
-------------------------------------------------
=
Analog Brightness Control
A1
VIN
IND
IND
GND
CH1
CIN
VEXTERNAL
L = 4.7
µH
4.7
µF
2.7V to 5.5V
CH2
A2
Digital Brightness Control
A1
B1
B2
IND
IND
GND
CH1
CIN
DAC Inputs
L = 4.7
µH
4.7
µF
2.7V to 5.5V
CH2
A2


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