LM3644: LM3644

Rajesh Kora

Prodigy 20 points

Part Number: LM3644

Hi Team,

Just a few question about LM3644 LED driver,

1. Can we drive 1.5A from each LED channel (1.5A + 1.5A, total of 3A) ?

2. If we are not using TX, STROBE & Torch pins, can we left it floating?

Thanks you,

K. Rajesh

over 3 years ago

0 Sean Zhou over 3 years ago

TI__Mastermind 22745 points

Hi Kora,

1. Yes, if you provide enough supply voltage which makes device works underpass mode and environment temp is not very high.

2. Yes.

Sean

0 Rajesh Kora over 3 years ago in reply to Sean Zhou

Prodigy 20 points

Hi Sean,

Thanks for the details !!

One more doubt, how to determine power dissipation of LM3644 IC?

We are using 5V as input, driving 1.2A current from each LED channel (so totally 2.4A ) and LED forward voltage is 3.25V.

For thermal analysis, we need this power dissipation value.

Thank you

k. Rajesh

0 Sean Zhou over 3 years ago in reply to Rajesh Kora

TI__Mastermind 22745 points

Hi Kora，

I'm sorry that It is difficult to calculate the power loss, the most accurate way is to test with the detail application spec, you can request the LM3644EVM from TI.com.

Sean

Power management

Power management forum

LM3644: LM3644