TPSM33615: TPSM33615

Eli Hait54

Part Number: TPSM33615

Hi,

My question relates TPSM33615 DCDC module:

My application requires buck DCDC converter to 12VDC out from 24V automotive input which may vary between 18 to 32V but sometimes it may go downto 8V for short period of times.

Obviously, the buck converter can't produce 12V output from Vin<12V+Vdrop but in such case of too low Vin value the Vout to follow Vin-Vdrop (drop state) and not to enter into lockout state.

So what happens if programming the UVLO to value less than 8V, will the output reliable follow the input voltage when it is too low?

Thanx,

Eli.

6 months ago

0 Richard Fu22 6 months ago

TI__Mastermind 20390 points

Hi Eli,

The device should function until the falling UVLO threshold is tripped.

Thanks,

Richard

0 Eli Hait54 6 months ago in reply to Richard Fu22

Prodigy 220 points

Thanx, Richard.

So if i'll program the UVLO to very low value it will track the input voltage, right?

Thanx,

Eli.

0 Richard Fu22 6 months ago in reply to Eli Hait54

TI__Mastermind 20390 points

Hi Eli,

Yes- that should be correct.

Thanks,

Richard

0 Eli Hait54 6 months ago in reply to Richard Fu22

Prodigy 220 points

Hi, Richard.

Thanx or your answer.

I have another question related to this module:

The Webbench design application shows that both SW pins (5 and 6) should be shorted.

However, in the data sheet it wasn't mentioned and in the "9.5.2 Layout Example" they are not connected.

Should or shouldn't they been connected?

I see on the package layout that pin 5 is a large one and pin 6 is a very small - is there any meaning for it?

Thanx,
Eli.

0 Richard Fu22 6 months ago in reply to Eli Hait54

TI__Mastermind 20390 points

Hi Eli,

They should not be connected, and be left floating.

The large pin 5 could be where the inductor is internally connected to VOUT, and the small pin 6 is where the internal bootstrap is connected.

Thanks,

Richard

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TPSM33615: TPSM33615