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LM3445
SNVS570L – JANUARY 2009 – REVISED MAY 2013
www.ti.com
SENSING THE RECTIFIED TRIAC WAVEFORM
A bridge rectifier, BR1, converts the line (mains) voltage ( Figure 15 c) into a series of half-sines as shown in
Figure 15 b. Figure 15 a shows a typical voltage waveform after diode D3 (valley fill circuit, or V BUCK ).
V BUCK
(a)
V BR1
(b)
V AC
(c)
t
Figure 15. Voltage Waveforms After Bridge Rectifier Without Triac Dimming
Figure 16 c and Figure 16 b show typical triac dimmed voltage waveforms before and after the bridge rectifier.
Figure 16 a shows a typical triac dimmed voltage waveform after diode D3 (valley fill circuit, or V BUCK ).
V BUCK
(a)
t
V BR1
(b)
t
V AC
(c)
t
delay
?
Figure 16. Voltage Waveforms After Bridge Rectifier With Triac Dimming
LM3445 LINE SENSING CIRCUITRY
An external series pass regulator (R2, D1, and Q1) translates the rectified line voltage to a level where it can be
sensed by the BLDR pin on the LM3445.
10
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