LM3405A: Review

JITHU T P

Prodigy 140 points

Part Number: LM3405A

Please review the following circuit to drive a backlight of 9.6V and 280mA

over 1 year ago

0 Dave Yaeger over 1 year ago

TI__Intellectual 2925 points

Hi JITHU – our experts for this issue are currently celebrating the Chinese New Year. Please expect a delay in response. Thank you for your understanding.

0 Mason Wang over 1 year ago

TI__Genius 9630 points

hi JITHU

I think the schematic is fine for operation of 12V input, 9.6V output, 280mA LED current.

0 JITHU T P over 1 year ago in reply to Mason Wang

Prodigy 140 points

The inductor value is 47uH by calculation. I am a bit concerned about it.

0 Mason Wang over 1 year ago in reply to JITHU T P

TI__Genius 9630 points

Hi JITHU

I do not think this will be a problem. Since the target current is quite small, this will lead to a large inductor by calculation compared with the value in datasheet typical application. Normally large inductor will get smaller ripple current and thus lower inductor loss. If this is not a concern, smaller inductor can also be chosen.

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LM3405A: Review