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LP38798 & 1.2V output setting

Marek Petrinec2
Prodigy 90 points
Other Parts Discussed in Thread: LP38798

Hello,

Ive already tried your chat but they could not answer my question.

So could anyone confirm my premise about LP38798?

If i want output voltage 1.2V, so do i have to connect just one 10kOhm resistor from FB to GND and SET pin left floating or connect FB and SET pin directly? Is it right?

Many thanks

  • 0
    TI__Mastermind 22610 points

    From the formula:    R1 = R2 × (( Vout / Vfb) – 1 )

    For Vout = Vfb : R1 (between FB and OUT) will be 0 (zero)

    The minimum allowed value for R2 (between FB and GND) is 12.9 kΩ (Section 7.5.1 in the LP38798 datasheet), with a suggested range for R2 of 12.9 kΩ to 100 kΩ.