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LP3302 bảng dữ liệu(PDF) 12 Page - Lowpower Semiconductor inc

tên linh kiện LP3302
Giải thích chi tiết về linh kiện  1.1MHz Fixed-Frequency PWM Operation
PDF  13 Pages
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nhà sản xuất  POWER [Lowpower Semiconductor inc]
Trang chủ  http://www.lowpowersemi.com
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LP3302 bảng dữ liệu(HTML) 12 Page - Lowpower Semiconductor inc

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Preliminary Datasheet
LP3302
LP3302B6F-00
Version 1.0 Datasheet
May.-2013
www.lowpowersemi.com
Page 12 of 13
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%.



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