DAC8771: R1,R2,R4,R5,R6 Which Function

Alex Chen9

Expert 1075 points

Part Number: DAC8771

Hi SIR

Could you let me know which the R1,R2,R4,R5,R6 function??

thanks

over 7 years ago

0 Garrett Satterfield over 7 years ago

TI__Expert 5820 points

Hi Alex,

It appears that your image did not attach so I am not quite sure which resistors you are referring to. Can you reattach the image?

Thanks,
Garrett

0 Alex Chen9 over 7 years ago in reply to Garrett Satterfield

Expert 1075 points

0 Garrett Satterfield over 7 years ago in reply to Alex Chen9

TI__Expert 5820 points

Hi Alex,

R1 and R2 form low pass filters with C4, C6 and C3, C5 respectively. These filter the output of the buck-boost converter (Vpos, Vneg) to reduce the output voltage ripple.

R4, R5, and R6 are current limiting resistors that limit the current into these pins in case of electrical over stress. These are part of the external protection circuitry developed for passing the IEC61000-4 suite of EMC tests. You can view more information about this in the reference design http://www.ti.com/tool/TIPD216 .

Thanks,

Garrett

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DAC8771: R1,R2,R4,R5,R6 Which Function