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TPS784-Q1: what is difference between using TPS78412 and TPS78401 FB tie to Vout?

Takuma Ito
Expert 5200 points
Part Number: TPS784-Q1

what is difference between using TPS78412 and TPS78401 FB tie to Vout? it looks like both can do 1.2V output and same schematics. 

ito 

  • 0
    TI__Genius 12040 points

    Hello Ito-San,

                         TPS78412 refers to fixed 1.2V Output version, whereas TPS78401 refers to an adjustable Output voltage version of the device. Both versions are capable of producing VOUT = 1.2V, but would require different schematics since the pinout of both these versions are different. The adjustable version has an FB pin (which is replaced by a 'NC' pin in the fixed output version) and requires a pair resistors connected between OUT, FB and GND pins to generate VOUT = 1.2V. This is described in section 8.1.3 of the datasheet. Thanks!

    Regards,

    Srikanth 

  • 0 in reply to Srikanth Lolla Venkata
    TI__Expert 5200 points

    hi Srikanth 

    thank you for your answer.  i thought just i can connect the FB directly to Vout for 1.2V since FB is 1.2V. Do you still need bottom resistor? if so what is recommended value for bottom resistor? 

  • +1 in reply to Takuma Ito
    TI__Genius 12040 points

    Hello Ito-San,

                          You are correct, in the adjustable version you may simply connect FB to OUT to get 1.2V of VOUT. You do not need the bottom resistor. For the fixed out version you do not need to make this connection. Thanks!

    Regards,

    Srikanth