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?
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Hi engineer,
LM3644 can support Pass mode(LDO mode) and boost mode, the output voltage depends on the forward voltage that you need. For example, if you check the datasheet of the LED, some LED may has the volatge over 3.3V, some LED may only has less than 1.75V forward voltage. So that really depends on the V-I characteries of the LED that you chosed.
If you think that I have resolved your problem, please help to click "Resolved" for me. Thanks.
Regards
Sean
Hi sir,
I'm sorry if you check the spec table on the datasheet, there is a spec "VOVP" is about 5V, so that means you can't output 6V with LM3644. Thanks.
Regards
Sean
Hi,
No, it will adjust the output voltage with the desired LED forward voltage for better efficiency.
Regards
Sean
Hi ,
What' s your mean about 2A, 2A for each channel? You can check TPS61300/1 or TPS61325 or LM3550.
Regards
Sean