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LM3445M Datasheet(PDF) 27 Page - Texas Instruments

Part # LM3445M
Description  Triac Dimmable Offline LED Driver
PDF  39 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

LM3445M Datasheet(HTML) 27 Page - Texas Instruments

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VLED(MIN)
1 -
ID =
VBUCK(MAX)
x ILED(AVE)
t VAC-RMS(MAX) 2
VD
LM3445
www.ti.com
SNVS570L – JANUARY 2009 – REVISED MAY 2013
RE-CIRCULATING DIODE
The LM3445 Buck converter requires a re-circulating diode D10 (see the Typical Application circuit to carry the
inductor current during the MOSFET Q2 off-time. The most efficient choice for D10 is a diode with a low forward
drop and near-zero reverse recovery time that can withstand a reverse voltage of the maximum voltage seen at
VBUCK. For a common 110VAC ± 20% line, the reverse voltage could be as high as 190V.
(33)
The current rating must be at least:
ID = 1 - (DMIN) x ILED(AVE)
(34)
Or:
(35)
Copyright © 2009–2013, Texas Instruments Incorporated
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