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SS6896 데이터시트(PDF) 9 Page - Silicon Standard Corp.

부품명 SS6896
상세설명  1.4MHz Current-Mode Step-Up DC/DC Converter
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제조업체  SSC [Silicon Standard Corp.]
홈페이지  http://www.siliconstandard.com
Logo SSC - Silicon Standard Corp.

SS6896 데이터시트(HTML) 9 Page - Silicon Standard Corp.

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Rev.2.01 6/06/2003
SS6896
Application Information
Inductor Selection
A 15
µH inductor is recommended for most SS6896
applications. Although small size and high efficiency
are major concerns, the inductor should have low
core losses at 1.4MHz and low DCR (copper wire
resistance).
Capacitor Selection
The small size of ceramic capacitors makes them
ideal for SS6896 applications. X5R and X7R types
are
recommended
because
they
retain
their
capacitance over wider ranges of
voltage and
temperature than other types, such as Y5V or Z5U.
A 4.7
µF input capacitor and a 1µF output capacitor
are sufficient for most SS6896 applications.
Diode Selection
Schottky diodes, with their low forward voltage drop
and fast reverse recovery, are the ideal choices for
SS6896 applications. The forward voltage drop of a
Schottky diode represents the conduction losses in
the diode, while the diode capacitance (CT or CD)
represents the switching losses. For diode selection,
both forward voltage drop and diode capacitance
need to be considered. Schottky diodes with higher
current ratings usually have lower forward voltage
drop and larger diode capacitance, which can cause
significant switching losses at the 1.4MHz switching
frequency of the SS6896. A Schottky diode rated at
100mA to 200mA is sufficient for most SS6896
applications.
LED Current Control
LED current is controlled by a feedback resistor (R1
in Fig. 1). The feedback reference is 1.23V. The
LED current is 1.23V/R1. In order to have accurate
LED current, precision resistors are preferred (1%
recommended). The formula for R1 selection is
shown below.
R1 = 1.23V/ILED
(1)
Open-Circuit Protection
In the cases of output open-circuit, when the LEDs
are disconnected from the circuit or the LEDs fail,
the feedback voltage will be zero. The SS6896 will
then switch to a high duty cycle resulting in a high
output voltage, which may cause the SW pin
voltage to exceed its maximum 30V rating. A zener
diode can be used at the output to limit the voltage
on the SW pin (Fig. 20). The zener voltage should
be larger than the maximum forward voltage of the
LED string. The current rating of the zener should
be larger than 0.1mA.
Dimming Control
There are three different types of dimming control
circuits as follows:
1. Using a PWM signal
PWM
brightness
control
provides
the
widest
dimming range by pulsing the LEDs on and off using
the control signal. The LEDs operate at either zero
or full current, The average LED current changes
with the duty cycle of the PWM signal. Typically, a
1kHz to 10kHz PWM signal is used. PWM dimming
with the SS6896 can be accomplished two different
ways (see Fig. 21). The
SHDN pin can be driven
directly or a resistor can be added to drive the FB
pin. If the
SHDN pin is used, increasing the duty
cycle will increase the LED brightness. If the FB pin
is used, increasing the duty cycle will decrease the
brightness. Using this method, the LEDs are dimmed
using FB and turned off completely using
SHDN .
2. Using a DC Voltage
For some applications, the preferred method of
brightness control uses a variable DC voltage to
adjust the LED current. The dimming control using a


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