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TPS61160: Ripple current

Naizeng Wang
Expert 5380 points
Part Number: TPS61160

Hi team,

Please see 8.2.3 Li-Ion Driver for 6 White LEDs in datasheet. Input voltage is 3V to 5V. Inductance is 10uH. Io=20mA. Vo=19V.

According to the calculating results in following picture, the ripple current of inductor is 0.33A, which is larger than 2*0.13A. So the circuit works at DCM mode in this situation.

However, the input current in fig. 26 is continuous. Why?

  • 0
    TI__Genius 13001 points

    Hi Naizeng,

    For actual application, there is parasitic inductance and resistance from power supply to input of device, combined with Cin, input current is filtered. To furtherly verify the result, I have a simulation. The first one is without parasitic inductance and resistance, and the second one is w/ parasitic inductance and resistance.