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LP3311 数据表(PDF) 7 Page - Lowpower Semiconductor inc

部件名 LP3311
功能描述  1.3MHzFixed-Frequency PWM Operation
PDF  8 Pages
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制造商  POWER [Lowpower Semiconductor inc]
网页  http://www.lowpowersemi.com
标志 POWER - Lowpower Semiconductor inc

LP3311 数据表(HTML) 7 Page - Lowpower Semiconductor inc

  LP3311 Datasheet HTML 1Page - Lowpower Semiconductor inc LP3311 Datasheet HTML 2Page - Lowpower Semiconductor inc LP3311 Datasheet HTML 3Page - Lowpower Semiconductor inc LP3311 Datasheet HTML 4Page - Lowpower Semiconductor inc LP3311 Datasheet HTML 5Page - Lowpower Semiconductor inc LP3311 Datasheet HTML 6Page - Lowpower Semiconductor inc LP3311 Datasheet HTML 7Page - Lowpower Semiconductor inc LP3311 Datasheet HTML 8Page - Lowpower Semiconductor inc  
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Preliminary Datasheet
LP3311
LP3311 – 00 Version 1.0 Datasheet
Feb.-2011
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%.
PWM
EN
4
FB
3
Vin
6
OVP
5
U4
LP3311
R2
5k
Vin
R1
10
Cout
1uF
Cin
10uF
4.7uH
R3
90k
R4
100K
Cout
0.1uF
(0-100KHz)
For Larger Panel application Circuit
R1
12
3S13P
Cout
4.7uF
4.7uH
Cin
10uF
Vin
EN
4
FB
3
Vin
6
OVP
5
LP3311
PWM



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