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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
V BUCK . For a common 110V AC ± 20% line, the reverse voltage could be as high as 190V.
V D t V AC-RMS(MAX) 2
The current rating must be at least:
I D = 1 - (D MIN ) x I LED(AVE)
Or:
(33)
(34)
I D = 1 -
V LED(MIN)
V BUCK(MAX)
x I LED(AVE)
(35)
Copyright ? 2009–2013, Texas Instruments Incorporated
Product Folder Links: LM3445
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