参数资料
型号: LM3445TRIACEVAL
厂商: National Semiconductor
文件页数: 10/40页
文件大小: 0K
描述: BOARD EVAL LM3445MM
标准包装: 1
系列: PowerWise®
电流 - 输出 / 通道: 770mA
输出及类型: 1,非隔离
特点: 可调光
输入电压: 8 ~ 12V
已供物品:
已用 IC / 零件: LM3445MM
相关产品: LM3445MMX-ND - IC LED DRIVER TRIAC DIMM 10-MSOP
LM3445MMDKR-ND - IC LED DRIVER TRIAC DIMM 10-MSOP
LM3445MMCT-ND - IC LED DRIVER TRIAC DIMM 10-MSOP
LM3445MMTR-ND - IC LED DRIVER TRIAC DIMM 10-MSOP
SNVS570L – JANUARY 2009 – REVISED MAY 2013
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
Product Folder Links: LM3445
Copyright ? 2009–2013, Texas Instruments Incorporated
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