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LMR16006: Calculate output current for Capacitive Power Supply 3 phase

S Ch
Prodigy 200 points
Part Number: LMR16006

Present  I design LMR16006 with Capacitive Power Supply 1 phase, and have Output 50mA, 3.6V.

if I re design to 3 phase, Capacitive Power Supply , similar SLAA577G does the output current will be 3 times? (150mA)  Do you have any calculatoion formula or applcaiton note how to caluclate ?

  • 0
    TI__Mastermind 27045 points

    Hi

    For rough estimation, you can consider it's current source to provide input power as the capacitor impedance is very high

    For one capacitor, the Iin_rms=U_rms / Zc, the average input current after rectification is 0.9*Iin_rms.

    For 3 phase,  the average input current after rectification is 2.34*Iin_rms,

    So power capacity increased: 2.34/0.9=2.6 times.

    B R

    Andy