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SS6896 Datasheet(PDF) 10 Page - Silicon Standard Corp.

No. de pieza SS6896
Descripción Electrónicos  1.4MHz Current-Mode Step-Up DC/DC Converter
PDF  12 Pages
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Fabricante Electrónico  SSC [Silicon Standard Corp.]
Página de inicio  http://www.siliconstandard.com
Logo SSC - Silicon Standard Corp.

SS6896 Datasheet(HTML) 10 Page - Silicon Standard Corp.

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Rev.2.01 6/06/2003
SS6896
DC voltage is shown in Fig. 22. As the DC voltage
increases, the voltage drop on R2 increases and the
voltage drop on R1 decreases.
Thus, the LED current decreases. The selection of
R2 and R3 should make the current from the
variable DC source much smaller than the LED
current and much larger than the FB pin bias current.
For VDC range from 0V to 5V, the selection of
resistors in Fig. 22 gives dimming control of LED
current from 20mA to 0mA.
3. Using a Filtered PWM Signal
The filtered PWM signal can be considered as an
adjustable DC voltage. It can be used to replace the
variable DC voltage source in dimming control. The
circuit is shown in Fig. 23.
ZD1
19.6V~20.4V
BZV55-B20
R2
1K£[
LX
FB
GND
SS
SHDN
IN
L1
10µH
C2
0.033µF
C1
4.7µF
ON
OFF
3V to 4.2V
VIN
D1
CH521S-30
R1
62£[
C3
1µF
IOUT=ILED=20mA
6
4
1
3
5
2
Fig. 20 White LED driver with open-circuit protection
LX
FB
GND
SS
SHDN
IN
SS6896
C2
0.033
µF
R1
62£[
R2
1K£[
PWM
ZD1
LX
FB
GND
SS
SHDN
IN
SS6896
C2
0.033
µF
R1
82
Ω
R2
1K
Ω
PWM
ZD1
R3
3.3K
Ω
ON
OFF
(a)
(b)
Fig. 21 Dimming-control using a PWM signal
SS6896



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