LM5143-Q1: LM5143-Q1

Andre Salehi

Part Number: LM5143-Q1
Other Parts Discussed in Thread: LMR36015-Q1, LM5145, LM5146-Q1, LMR36015, LM5160, LM10011

I would like to use LM5143-Q1 in an application that:

1) VIN = 48VDC

2) Adjustable VOUT = 0.6V .. 47V @1.25A

My questions are:

1) Is LM5143-Q1 suitable for my application?

2) I would like to adjust the output voltage via microprocessor. Any suggestion?

Thank you,

over 3 years ago

+1 Timothy Hegarty over 3 years ago

TI__Guru 63397 points

Hi Andre,

No need for a 2-channel/phase controller for just 1.25A output current. Better to use a converter with integrated FETs, something like the LMR36015-Q1. If you prefer a controller, then the LM5145 / LM5146-Q1 is a good option (it's toff-min spec is 140ns, which sets the max duty cycle depending on the Fsw).

You can adjust VOUT by having a variable duty cycle PWM signal from the uP and pass it through an RC filter to create a DC voltage that resistively couples into FB.

Regards,

Tim

0 Andre Salehi over 3 years ago in reply to Timothy Hegarty

Prodigy 30 points

Hi Tim,

I forgot to mention, I need two such DC2DC to operate simultaneously.
I will look into LM5145/ LM5146-Q.

Best regards,

0 Timothy Hegarty over 3 years ago in reply to Andre Salehi

TI__Guru 63397 points

The converter with integrated FETs would be the easiest solution, especially given the low output current spec. The LMR36015 60V/1.5A is likely the best option, and we also have the LM5160 65V/2A. The only caveat is that they do not go down to 0.6V out (only the LM5143-Q1 does that).

0 Andre Salehi over 3 years ago in reply to Timothy Hegarty

Prodigy 30 points

I agree, LMR36015 is the best option. I will use it with LM10011 to control the output voltage.

Thank you!

0 Timothy Hegarty over 3 years ago in reply to Andre Salehi

TI__Guru 63397 points

Definitely a nice part given the 2 x 3mm package, but keep in mind that Vout-min is 1V.

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LM5143-Q1: LM5143-Q1