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LM3488: Voltage output not as per the equation

Anish Bekal
Prodigy 30 points
Part Number: LM3488
Other Parts Discussed in Thread: TIDA-010057

Hi,

I am using LM3488MM for generating +/-80v as per a reference design TIDA-010057. But i am getting only +/-40v. The resistors have been put as per the design equation in the datasheet and reference design.

The voltage at the FB pin is 0.4 v instead of 1.26v.

Can you please provide some clarity.

  • 0
    TI__Genius 11215 points

    Hello,

    Thanks for reaching out. Could you please share more details about this issue? Has anything been changed with respect to the TIDA-010057 design? Could you please share the schematic, a scope shot with Vout, FB, ISEN and DR pins and your full specifications (Vin range, max load current, switching frequency)? We're looking forward hearing from you. 

     

    Kind regards,
    EM