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LP3322 Datasheet(PDF) 7 Page - Lowpower Semiconductor inc

Part # LP3322
Description  1.1MHzFixed-Frequency PWM Operation
PDF  8 Pages
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Manufacturer  POWER [Lowpower Semiconductor inc]
Direct Link  http://www.lowpowersemi.com
Logo POWER - Lowpower Semiconductor inc

LP3322 Datasheet(HTML) 7 Page - Lowpower Semiconductor inc

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Preliminary Datasheet
LP3322
LP3322 – 00 Vesion 1.0 Datasheet
Feb.-2013
www.lowpowersemi.com
Page 7 of 8
c. Using a Filtered PWM signal
Another common application is using a filtered
PWM signal as an adjustable DC voltage for LED
dimming control. A filtered PWM signal acts as the
DC voltage to regulate the output current. The
recommended application circuit is shown in the
Figure 6. In this circuit, the output ripple depends
on the frequency of PWM signal. For smaller output
voltage
ripple
(<100mV),
the
recommended
frequency of 2.8V PWM signal should be above
2kHz. To fix the frequency of PWM signal and
change the duty cycle of PWM signal can get
different
output
current.
According
to
the
application circuit of Figure 5, output current is
from 20.5mA to 5.5mA by adjusting the PWM duty
cycle from 10% to 90%.
EN
4
FB
3
Vin
6
OUT
5
LP3322
PWM
Vin
R2
5k
R1
10
Cout
1uF
Cin
10uF
10uH
R3
90k
R4
100K
(0-100KHz)
C2
0.1uF



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