TLV1117: TLV1117IDCY

Jixia He

Part Number: TLV1117

Hi,

I use 1K ,1.62k and TLV1117IDCY to get 3.3V,but i get 3.8V, the Vref is 0.88V.

Can give me some advice to resove it .

Thanks a lot !

Best regards!

Jixia

0 Erin Thibeault 9 months ago

Hi Jixia,

Could you please share a picture of your schematic?

Thanks,

Erin

0 Jixia He 9 months ago in reply to Erin Thibeault

0 Erin Thibeault 9 months ago in reply to Jixia He

Hi Jixia,

Typical value for Vref in the datasheet is 1.25V. Are you measuring 0.88V at Vadj?

Both R1 and R2 are listed as 1ku Ohms in this schematic, is this intentional?

At Vref = 0.88V I calculated Vout = Vref(1+R2/R1) = 0.88(1+ 1620/1000) = 2.3V

At Vref = 1.25V I calculated Vout = 1.25(1+1620/1000) = 3.28V

Neither of these match Vout that you are seeing. Are you calculating Vout per the datasheet or measuring Vout?

BR,

Erin

0 Jixia He 9 months ago in reply to Erin Thibeault

Hi,

R3 is 1.65K.

0 Erin Thibeault 8 months ago in reply to Jixia He

Hi Jixia,

In this case, Vout = 1.25(1 + 1650/1000) = 3.3125V

Neither of these match Vout that you are seeing. Are you calculating Vout per the datasheet or measuring Vout?

BR,

Erin

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