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LM3644:

Part Number: LM3644
Other Parts Discussed in Thread: LM3550, TPS61325, TPS61300

in flash mode,i found out the votage  between led and Ground is 2.8v ,Vin is 4.2v,L=1uh,is it normal ?   i found the datasheet said the Vled can be 4.5v,how to make the Vled reach to 4.5v?