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LM3445M/NOPB bảng dữ liệu(PDF) 11 Page - Texas Instruments

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tên linh kiện LM3445M/NOPB
Giải thích chi tiết về linh kiện  TRIAC Dimmable Offline LED Driver
PDF  42 Pages
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nhà sản xuất  TI1 [Texas Instruments]
Trang chủ  http://www.ti.com
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LM3445M/NOPB bảng dữ liệu(HTML) 11 Page - Texas Instruments

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delay
VBUCK
VAC
VBR1
t
?
(a)
(b)
(c)
t
t
VAC
VBR1
t
(a)
(b)
(c)
VBUCK
LM3445
www.ti.com
SNVS570M – JANUARY 2009 – REVISED NOVEMBER 2015
Feature Description (continued)
7.3.3 Sensing the Rectified TRIAC Waveform
A bridge rectifier, BR1, converts the line (mains) voltage (Figure 12c) into a series of half-sines as shown in
Figure 12b. Figure 12a shows a typical voltage waveform after diode D3 (valley fill circuit, or VBUCK).
Figure 12. Voltage Waveforms After Bridge Rectifier Without TRIAC Dimming
Figure 13c and Figure 13b show typical TRIAC dimmed voltage waveforms before and after the bridge rectifier.
Figure 13a shows a typical TRIAC dimmed voltage waveform after diode D3 (valley fill circuit, or VBUCK).
Figure 13. Voltage Waveforms After Bridge Rectifier With TRIAC Dimming
Copyright © 2009–2015, Texas Instruments Incorporated
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