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LM5025: LM5025

Part Number: LM5025

in Lm5025 there is an internal regulator that provides the initial Vcc .but when converter reaches steady state it is suggested to provide vcc through a coupled inductor which will turn off the internal regulator 

.If I operate it without coupled inductor providing vcc supply and keeping internal regulator on ,does that have any impact on the converter other than reduction in efficiency?

  • Hi Muhammed,

    We recommend to use a bias VCC by an aux transformer, because if the all current of device I_in is from VCC regulator, the current may exceeds the limitation 20mA, and the power loss of the chip will be very large, calculated by I_in * (Vin * Vcc).

    Regards,

    Teng