LM25088: LM25088 question

Aleksandr Stepanov

Part Number: LM25088

Dear TI community,

I've got a problem with the TI LM25088.

I had tried to set Vout as 4.2 V, Rfb1=1.6 kOhm, Rfb2=3.9 kOhm or Rfb1=2.2 kOhm, Rfb2=5.6 kOhm. but it is strongly depends on Vin and sets from 6.2 to 10.6 Volts. BTW if i put Rfb2 more greater then above Vout don't increases by more then 1 Volt.

over 7 years ago

0 Samuel Jaffe over 7 years ago

TI__Mastermind 25590 points

Aleksandr,

Can you please share a schematic? You may also use the WEBENCH design tool to create a schematic and compare against. This is found on the LM25088 product page on the right.

-Sam

0 Aleksandr Stepanov over 7 years ago in reply to Samuel Jaffe

Prodigy 90 points

Sam,

I find out that it's working with load resistor pretty good. But i have to create design there i got several "storey" of Voltages ( Vout1=GND2, Vout2=GND3 and e.t.c.), but after 3d "storey" LM25088 doesn't starting (can't set voltage as it sets by Rfb). For schematic i used WEBENCH nominals.

0 Samuel Jaffe over 7 years ago in reply to Aleksandr Stepanov

TI__Mastermind 25590 points

Aleksandr,

Please share a schematic so I can take a look.

-Sam

0 Aleksandr Stepanov over 7 years ago in reply to Samuel Jaffe

Prodigy 90 points

I'm sorry, but i did forget about current limit. all LM25088 works pretty good, problem solved.

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LM25088: LM25088 question