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LM3445M/NOPB Datasheet(PDF) 11 Page - Texas Instruments

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Part # LM3445M/NOPB
Description  TRIAC Dimmable Offline LED Driver
PDF  42 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM3445M/NOPB Datasheet(HTML) 11 Page - Texas Instruments

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background image
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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